UF Membrane Manual

Hangzhou Tianchuang Waterpure Equipment Co., Ltd Tel: +86-571-86989169 Fax: +86-571-88620836 www.hztianchuang.com Hangzhou Tianchuang waterpure equipment Co.,ltd PUF products manual Chapter 1 Company profile -----------------------------------------------------Page 2 Chapter 2 UF modules brief -----------------------------------------------------Page 3 Chapter 3 UF modules parameter -----------------------------------------------------Page 6 Chapter 4.UF system design ----------------------------------------------------Page 12 Chapter 5.UF system running and clean----------------------------------------------Page 19 Hangzhou Tianchuang Wateprure Equipment Co.,ltd. Add: Cangquan industrial zone,Yuhang town, Hangzhou China Tel:+86 571-6989169 Fax:+86 571-88620836 /86981273 Website: www.hztianchuang.com PDF ???? "pdfFactory Pro" ?????? www.fineprint.cnHangzhou Tianchuang Waterpure Equipment Co., Ltd Tel: +86-571-86989169 Fax: +86-571-88620836 www.hztianchuang.com Chapter 1 Company profile Hangzhou Tianchuagn Waterpure Equipment Co., ltd, privately owned company in China established in 1997, specializes in the design, manufacture, installation, operation and maintenance of advanced water and wastewater treatment systems and services. Tianchuang provides its clients with a wide range of hi-tech water and wastewater treatment solutions, utilizing the most advanced technologies, including membrane technology research and development, membrane plant development and production, membrane material and membrane modules production. Together with its project design, system integration, on-site installation and after-sale service, our factory enjoys a high prestige in the home membrane industry. Our PP hollow fiber has characteristic of Higher porosity, high flux, anti-fouling, anti-aging, long life-span etc and has already been widely used in the area of material concentration and separation, industrial and municipal wastewater treatment and recycle, food industry and other environmental protection areas.Tianchuang provides membrane separation technologies, Ultra-Filtration (UF), Continue Membrane Filtration (CMF) and Membrane Bio Reactors (MBR) which acts important role technologies for the wastewater treatment.Tianchuang always keeps designing the superior performance, quality and reliable products basis on the advanced science & technology ,and gets good reputation from our customers from mainland & overseas for our high quality & good service. Our philosophy is that “Quality wins credibility; Service enjoys future”. Hope to make great progress together with you. 1.1 Advantage: Technology: It is the newest enhanced polypropylene hollow fiber membrane products with the high strength, high flux and best Anti-pollution Quality: Good quality control system on producing and supply the high quality products to our customers Service: Not only supplying the high quality product but design the best solution with our best experience and technology 1.2 PUF membrane characteristic: High strength & flux and best Anti-pollution 1. Improvement on the membrane flexible with our unique technology, improvement on the porosity rate of the membrane wall and the Uniformity of membrane pore which make the liquor with high turbidity & high concentration Organic and wastewater clarify and filtration. 2. Improve the fiber membrane out-diameter and inner-Diameter and increase the fiber wall thickness about 50% (1)Not easy to broken the fiber during chemical cleaning (2)Low energy consumption; reduce the resistance of the liquor in the fiber PDF ???? "pdfFactory Pro" ?????? www.fineprint.cnHangzhou Tianchuang Waterpure Equipment Co., Ltd Tel: +86-571-86989169 Fax: +86-571-88620836 www.hztianchuang.com Chapter 2 PUF modules brief 2.1 UF membrane filtration brief The membrane filtration is the membrane separation technology with the porosity configurations. And the separation is for the Macromolecular of the Substances in the liquor. The membrane filtration process is the liquor separation (based on the principle of the Mechanical screening) with the drive power from the two sides of the UF modules pressure differences. Operational pressure range is 0.1~0.3MPa, pore size range is 0.05~0.2µm, MWCO with approx 50~1000KD. The difference between normal filtration and pore filtration: 1 Small pore size and almost cutoff all of bacteria, heat source, virus, colloid atom, protein and Macromolecules organic 2 The membrane pore size, Dissolved particles size and form( soft or strong), liquor chemical characteristic(PH etc) and element, and so on. All of them will affect the membrane separation. 3 There is no block material and less accumulates on the membrane surface during the treatment process, and the speed of filtration will get the balance no continuous attenuation in the stable situation. But the cutoff rate of modules will be low when treat the macromolecules organic liquor. 2.2 Hollow fiber membrane and modules: Hollow fiber membrane is one of the membrane filtration types, the membrane is in capillary pipe and the pore covers the pipe surface which makes the other material pass or no through it. There are two types of the modules (Out-to-In and In-to-In) The hollow fiber membrane modules with housing, seal, end cap, center pipe(In-to-Out without center pipe), water distribution devices(In-to-Out without) and hollow fiber membrane. Also has feed inlet and outlet with it, its characteristic: (1)hollow fibers are installed in the membrane housing, both end sealing with Polyurethane. Its simple structure and has large surface area, easy to clean and PDF ???? "pdfFactory Pro" ?????? www.fineprint.cnHangzhou Tianchuang Waterpure Equipment Co., Ltd Tel: +86-571-86989169 Fax: +86-571-88620836 www.hztianchuang.com possibly avoid the polluted by the bacteria (2)Easy to check and repair, stable cutoff rate and long life-span 2.3 Ultra-filtration(UF) modules: PUF modules are widely used as the pre-treatment of the RO, NF and MF process, and also used in the high turbidity surface water treatment Characteristic of the strength improved Polypropylene hollow fiber 1. Improvement on the membrane flexible with our unique technology, improvement on the porosity rate of the membrane wall and the Uniformity of membrane pore which make the liquor with high turbidity & high concentration Organic and wastewater clarify and filtration. (1)Membrane With good Anti-fatigue is about 1.8 times of the similar products (2) The real flux is about 1.2 times of the similar products (3) Special long pore construction and good flexible, no need the chemical cleaning during running 2. Improve the fiber membrane out-diameter and inner-Diameter and increase the fiber wall thickness about 50% (1)Not easy to broken the fiber during chemical cleaning (2)Low energy consumption; reduce the resistance of the liquor in the fiber PDF ???? "pdfFactory Pro" ?????? www.fineprint.cnHangzhou Tianchuang Waterpure Equipment Co., Ltd Tel: +86-571-86989169 Fax: +86-571-88620836 www.hztianchuang.com PUF modules running ways in X-Flow and concentration water in recycle with frequency backwashing process make full use of the system water and product water, and make the system running stable. PDF ???? "pdfFactory Pro" ?????? www.fineprint.cnHangzhou Tianchuang Waterpure Equipment Co., Ltd Tel: +86-571-86989169 Fax: +86-571-88620836 www.hztianchuang.com Chapter 3 PUF modules Performance parameter 3.1 UF Modules specification and parameter 3-1 PUF modules series specification and parameter table 3-2 PUF ultra-filtration modules figuration and connect size(mm) Membrane type Out-to-In hollow fiber Membrane material PP(Polypropylene) Housing UPVC /ABS Pore size 0.1~0.2µm Fiber OD/IN OD450µm,ID3500µm Ventilation rate of N2 =7.0X10-2 cm 3/cm2.cmHg Porosity rate 40~50% Strength 12MPa Product water(m 3/h) Specification Membrane area(M2) Weight(wet KG) Clean water Sea water wastewater Material concentration PUF-4040 15 5 0.5~0.8 0.4~0.6 0.3~0.5 0.3~0.5 PUF-5040 32 15 1~1.5 0.8~1.2 0.5~0.8 0.5~0.8 PUF-6040 45 20 1.5-2 1.2-1.5 0.8-1.0 0.8-1.0 PUF-8040 60 30 2~3 1.5~2.2 1.0~1.6 1.0~1.5 Max. in water pressure 4.0 bar(less than 10min) Product water turbidity = 0.2 NTU Product water SDI = 3 TOC removing rate 20% ~50 % PDF ???? "pdfFactory Pro" ?????? www.fineprint.cnHangzhou Tianchuang Waterpure Equipment Co., Ltd Tel: +86-571-86989169 Fax: +86-571-88620836 www.hztianchuang.com Specification L1 mm L2 mm D1 mm D2 mm PUF-42A 573 420 32 32 PUF-44A 1080 930 32 32 PUF-54A 1163 930 32 32 PUF-64A 1250 940 40 40 Specification L1 L2 D1 D2 PUF-84A 1230 1140 200 50 PDF ???? "pdfFactory Pro" ?????? www.fineprint.cnHangzhou Tianchuang Waterpure Equipment Co., Ltd Tel: +86-571-86989169 Fax: +86-571-88620836 www.hztianchuang.com 3.2 Modules apply condition 3.2.1 Apply situation Table 3-3 PUF Series apply requirements pH 1~14 Max. Turbidity =50 NTU Max. feed in pressure =4.0 bar (1.5-2.0bar during the working) Permeated flux 17~100L/m2.h.bar 25?(Against the feed in) Max. membrane permeated pressure difference =1.0 bar Operate temperature =4-45? Max. raw water remained Cl2 Concentration =0.1 mg/l (Calculate as per Cl2 ) Running ways X-Flow Or flow 3.2.2 Recommend designed flux Table 3-4 PUF Series apply situation PUF-4040:(membrane area:14m2) Raw water type Turbidity(NTU) COD output (m3/h) Concentration recycle(m3/h) Backwash alternation(Min) Gas wash alternation Groundwater =1 =1 1.0--1.2 0 240 Surface water 0-2 =2 0.8--1.0 0.4 120 PDF ???? "pdfFactory Pro" ?????? www.fineprint.cnHangzhou Tianchuang Waterpure Equipment Co., Ltd Tel: +86-571-86989169 Fax: +86-571-88620836 www.hztianchuang.com 2-5 =5 0.6--0.8 0.5 60 0.5-1Day 5-15 =20 0.4--0.5 0.5 30 30-120 Min 15-50 =50 0.3--0.4 0.8-2.5 15-20 15-60 Min Wastewater =10 =50 0.2--0.3 0.8-2.5 5-20 5-60 Min PUF-5040:(Membrane area:32m2) Raw water type Turbidity(NTU) COD output (m3/h) Concentration recycle(m3/h) Backwash alternation(Min) Gas wash alternation Groundwater =1 =1 2.0--2.5 0 240 Surface water 0-2 =2 1.2--1.7 0.8 120 2-5 =5 0.9--1.3 1.0 60 0.5-1Day 5-15 =20 0.7--0.9 1.0 30 30-120 Min 15-50 =50 0.4--0.6 2.0-3.5 15-20 15-60 Min Wastewater =10 =100 0.3--0.5 2.0-3.5 5-20 5-60 Min PUF-6040:(Membrane area:45m2) Raw water type Turbidity(NTU) COD output (m3/h) Concentration recycle(m3/h) Backwash alternation(Min) Gas wash alternation Groundwater =1 =1 2.5-3.5 0 240 Surface water 0-2 =2 1.5-2.2 1.O 120 2-5 =5 1.2-1.8 1.5 60 0.5-1Day PDF ???? "pdfFactory Pro" ?????? www.fineprint.cnHangzhou Tianchuang Waterpure Equipment Co., Ltd Tel: +86-571-86989169 Fax: +86-571-88620836 www.hztianchuang.com 5-15 =20 0.9-1.2 1.5 30 30-120 Min 15-50 =50 0.7-1.0 2.5-4.0 15-20 15-60 Min Wastewater =10 =100 0.5-0.8 2.5-4 5-20 5-60 Min PUF-8040:(membrane area:60m2) Raw water type Turbidity(NTU) COD output (m3/h) Concentration recycle(m3/h) Backwash alternation(Min) Gas wash alternation Groundwater =1 =1 3.0--5.0 0 240 Surface water 0-2 =2 2.0--3.0 2.0 120 2-5 =5 1.5--2.5 2.0-3.0 60 0.5-1Day 5-15 =20 1.0--2.0 2.0-3.0 30 30-120 Min 15-50 =50 1.0--1.6 3.0-5.0 15-20 15-60 Min Wastewater =10 =100 1.0--1.3 3.0-5.0 5-20 5-60 Min Remarks: 1.The above flux is the stable system value under the 25?,0.1Mpa 2. Temperature/Flux: The flux will go down 1~2% when the temperature decreases 1 ? 3. The treatment ability will be get from the special liquor testing PDF ???? "pdfFactory Pro" ?????? www.fineprint.cnHangzhou Tianchuang Waterpure Equipment Co., Ltd Tel: +86-571-86989169 Fax: +86-571-88620836 www.hztianchuang.com 3.2.3 Typical washing process condition Table 3-5 PUF Modules washing process situation Backwash frequency Every 30~60 min (Against raw water or testing) Backwash time 10~30 sec.(Against equipment size) Backwash water pressure 2.5~3.0Bar Backwash water capacity(as per one piece) 1~6 m3/h (as 2~3 times of product water) Backwash water CMF?RO clean or concentration water forward direction washing time 10~30 sec. forward direction washing water capacity As working flow Gas washing time 10~30 sec. In gas pressure =1.0 Bar Gas wash situation Gas characteristic Instrument air or filtration gas without oil Chemical washing Washing frequency Trans-membrane pressure will increase 1.0bar(same temperature), and it will not come back after above washing PDF ???? "pdfFactory Pro" ?????? www.fineprint.cnHangzhou Tianchuang Waterpure Equipment Co., Ltd Tel: +86-571-86989169 Fax: +86-571-88620836 www.hztianchuang.com Washing time 90~120 min. Washing chemicals 1%HCl 1%NaOH+0.1%NaClO (availability Cl) Washing flow 500~2000L/h /pcs Washing temp. 30~45? Note: If the original water is surface water or deeply treated sewage effluent, NaClO can be considered to be added into anti-washing water. Control the concentration of NaClO at 50ppm. The strengthening anti-washing can be done 1~4 times a day, 100ppm NaCl can be added if necessary. FRONT series components can also maintain a stable operation in the absence of chemical dispersed wash. Chapter 4 Ultra-filtration System Design 4.1 Selection principle of the membrane module design (1)if the influent water quality is designed as surface water,20? is the influent water temperature. (2)Flux can be determined according to figure 3-4, and adjusted according to raw water, water quality or testing result. 4.2 Membrane capacity of water and water temperature As the liquid viscosity will change with temperature, for any ultra-filtration membrane module, under any work pressure, the filter flow or the permeated membrane pressure difference will change significantly with temperature. The following figure 4-1 is the change of PUF with temperature under the same the permeated membrane pressure difference. PDF ???? "pdfFactory Pro" ?????? www.fineprint.cnHangzhou Tianchuang Waterpure Equipment Co., Ltd Tel: +86-571-86989169 Fax: +86-571-88620836 www.hztianchuang.com Figure 4-1 PUF Ultra-filtration membrane flux curve as a function of temperature In the figure, a liquid temperature of 25 ? for the baseline correction factor is set to 1. Get the correction factor from the table according to real temperature. Now the flux =standardized flux correction factor. 4.3 Anti-washing and cleaning of ultra-filtration To ensure the long stable function of ultra-filtration system,anti-wash systems, chemical cleaning systems, cleaning systems and compressed air systems is needed.(optional) PDF ???? "pdfFactory Pro" ?????? www.fineprint.cnHangzhou Tianchuang Waterpure Equipment Co., Ltd Tel: +86-571-86989169 Fax: +86-571-88620836 www.hztianchuang.com 4.3.1 Anti-wash system Including the anti-washing water tanks, anti-wash pumps and sodium hypochlorite dosing device. 4.3.1.1 Anti-washing water requirements Ultra-filtration anti-washing water usually uses product water 4.3.1.2 Anti-wash pumps As using frequently anti-wash technology in ultra-filtration,single set backwash pump is needed. Parameters can be according to: (1) Flow :Anti-washed membrane flux is 50~100L/m2.h,and then converts into the membrane flow and multiplies by the number of single component devices; (2) Pump lift:usually 20~30mH2O; (3) The Material flow of pump should be Stainless Steel. 4.3.1.3 Sodium Hypochlorite Dosing device For enhancing the effect of anti-washing of ultra-filtration device and inhibiting bacteria within membrane, sodium hypochlorite can be added. Sodium hypochlorite dosing device including, (1)Plus kits (2)Metering Pump:determine the flow of metering pump according to the concentration of sodium hypochlorite –50ppm, the pressure =0.3Mpa. 4.3.2 Chemistry Enhancing Cleaning System(CEB) For special or poor quality of raw water, it is proposed to add chemicals, enhancing the process of cleansing when running in the system. CEB is consist of pump kits and metering PDF ???? "pdfFactory Pro" ?????? www.fineprint.cnHangzhou Tianchuang Waterpure Equipment Co., Ltd Tel: +86-571-86989169 Fax: +86-571-88620836 www.hztianchuang.com pump 4.3.2.1 In case of ultra-filtration inorganic pollution of dosing device pickling, it is proposed to add acid solution. Chemical strengthening of cleansing, the acid can be used depending on the quality of raw water to choose hydrochloric acid, oxalic acid or citric acid and so on. Chemical Dosing acid to cleanse the device with the following equipment, (1)Plus kits (2)Metering Pump: determine the flow of metering pump according to the concentration of acid in the water (0.5% citric acid solution, acid solution or HCl solution), pressure>0.3MPa 4.3.2.2 Dosing washing device In order to prevent pollution of the ultra-filtration membrane caused by organic matter and biological activity, a certain concentration of alkali solution is suggested to add. The recommended concentration of alkali solution is 0.1% NaClO +0.5% NaOH solution. Chemical Dosing base to cleanse the device with the following equipment: (1)Plus kits (2)Metering Pump: determine the flow of metering pump according to the concentration of alkali in the water (0.1% NaClO + 0.5% NaOH), pressure>0.3MPa 4.3.3 Chemical Cleaning System Ultra-filtration trans-membrane pressure rises 1.0bar(in the same temperature)compared to the initial. If it can not be restored by anti-washing, clean the ultra-filtration device. Cleaning systems include cleaning solution containers, clean water and clean filter. 4.3.3.1 Cleaning Solution Containers It is for preparation of cleaning liquid storage. Volume can be determined according to, Single component of ultra-filtration devices’ cleaning liquid volume calculated from water volume of the membrane module in chart 4-4, plus the liquid volume of cleansing pipes and filter’s inner side. 4.3.3.2 Cleaning Water Pump (1)Flow: Each membrane module (500L/H~2000L/H), multiplies the number of single component devices; (2) about 20mH2O; (3)The Material flow of pump should be Stainless Steel. 4.3.3.3 Cleaning Filter Selected by the cleansing flow pump and the material is stainless steel. PDF ???? "pdfFactory Pro" ?????? www.fineprint.cnHangzhou Tianchuang Waterpure Equipment Co., Ltd Tel: +86-571-86989169 Fax: +86-571-88620836 www.hztianchuang.com 4.3.4 Compressed air system Gas scrubbing technology can improve the washing effect of the anti-ultra-filtration. Single component inlet gas 2~10Nm3/h. The gas source should be oil-free compressed air , the largest inlet pressure =1bar, 4.4 Ultra-filtration device programmed sequence table For ultra-filtration device anti-washing every 30~60 minutes, it runs automatically in normal. Table 3-1 PUF ultra-filtration membrane device running program step-by-step sequence tablePDF ???? "pdfFactory Pro" ?????? www.fineprint.cnHangzhou Tianchuang Waterpure Equipment Co., Ltd Tel: +86-571-86989169 Fax: +86-571-88620836 www.hztianchuang.com State Run Run 1 2 3 4 5 6 7 8 9 10 Step Run Bottom anti-washing Top anti-washing Gas washing positive direction wash Chemical strengthening of washing Strengthen the wash water Washing CIP Downtime The original pump P1 ? ? ? Anti-washing pump P2 ? ? ? Cleaning pump P3 ? Dosing pump ? Inlet valves AV1 ? ? ? Anti-wash relief valve AV2 ? ? Anti-wash relief valve AV3 ? ? ? ? ? Production valve AV4 ? Anti-wash valve AV5 ? ? ? Intake valve AV6 ? Valve state Cleaning valve V1 ? PDF ???? "pdfFactory Pro" ?????? www.fineprint.cnHangzhou Tianchuang Waterpure Equipment Co., Ltd Tel: +86-571-86989169 Fax: +86-571-88620836 www.hztianchuang.com Concentrated water discharge valve V2 ? ? ? ? ? ? ? ? Concentrated water return valve V3 ? Production water return valve V4 ? Time 15~60min 10~30S 10~30S 10~30S 10~20S 30~90S 5~15min 20~60S 1~3h Remark 1?The frequency of gas scrubbing is every 8 ~ 24 hours,chemicals to cleanse every 1~7 days,Determined in accordance with the actual water quality. 2?Concentrated water discharge valve using manual control valve, only opens in cross-flow run-time. 3?When there is no gas scrubbing or chemicals to cleanse, the program is running according to 1-2-3-5-10. Note:?.“?” means valve or pump in open state; ?. See Figure 3-2 UF run and anti-wash flow chart for the location of the valve PDF ???? "pdfFactory Pro" ?????? www.fineprint.cnHangzhou Tianchuang Waterpure Equipment Co., Ltd Tel: +86-571-86989169 Fax: +86-571-88620836 www.hztianchuang.com Chapter Five Ultra-filtration devices running 5.1 Overview In the first run of membrane, note that the start production water should be 60% of the designed water production. 24 hours later, increase it to designed water designed water production. This is good for long stabilization of membrane flux. The first run or recovering run after long time stop needs rinse to remove the protection solution. The start should be manual. When all of the velocity and pressure, time set, the equipment should come back to auto. PLC system can monitor the run of system effectively. If the operating conditions lack, the equipment will take protecting measures. Basically steps involved, 1) Start water pumps; 2) fill the device with water and rinse; 3) Start anti-washing pump; 4) Set and adjust the pressure of anti-laundering; 5) Set and adjust the intake pressure; 6) set time interval of anti-wash; 7) set time interval of gas scrubbing; 8) Set anti-washing order of the parallel device. 5.1.1 Checking contents of the pre-start 1) Ultra-filtration pre-treatment system operating properly, clean lines, water ultra-filtration with the design requirements; 2) Drainage systems have been ready; 3) Good instrument of work; 4) PLC program has been input; 5) Circuit system checks have been completed 5.1.2 Start Check before start, 1) all valves are shut down; 2) all pumps are shut down. 5.1.2.1 UF Modules flush related valves mark and flow sheet 1) open the forward direction washing discharged valve AV3 and production water return valveV4; 2) start water pumps; 3) adjust ultra-filtration device inlet valve AV1,keep low water pressure(<1.0bar); 4) keep washing until there is no bubble, then the pre-start preparation finish. 5.1.2.2 Startup Programs PDF ???? "pdfFactory Pro" ?????? www.fineprint.cnHangzhou Tianchuang Waterpure Equipment Co., Ltd Tel: +86-571-86989169 Fax: +86-571-88620836 www.hztianchuang.com Determine the maximum capacity of water, stress, anti-washing time interval according to inlet water, 1 UF components ultra-filtration water pressure should be controlled on both sides of the membrane pressure difference on average = 2.0bar 2 Flow and pressure adjustment procedures are as follows: ?Water adjustment Open water valve AV4; Start the original pump P1; Slowly open the inlet valves AV1; Adjust the inlet valves AV1, so that water flow capacity to meet the requirement of water; If there is concentration water emissions at the same time, adjustments should be synchronized of concentrated water emission valve V2. ?Adjust the water concentration (cross-flow condition) Slowly open the concentrated water valve V2, adjust to emissions needed. ? the adjustment of the anti-washing pressure Open concentrated water valve V2; Start anti-washing pump P2; Open the anti-washing valve AV5 slowly; Adjust anti-washing valve AV5 to the pressure = 2.5bar. ? The adjustment of gas washing pressure Open concentrated water valve V2; Open the forward direction washing discharged valve AV 3; Open the intake valve AV6 slowly until the inlet pressure to 1bar 5.1.2.3 Automatic control When all of the flux pressures are set up by manual control, the equipment needs to be shut down, and restart by auto control. 1 Close all control switch, switch manual control to automatic; 2 Start ultra-filtration devices; 3 Adjust the protection switch of water production pressure. When the pressure is higher than settings, the forward direction washing discharged valve AV3 start automatically. 5.2 Stop procedure 5.2.1 Manual control 1 Open the forward direction washing discharged valve AV3, wash for 15 seconds; 2 Shut down inlet water valve AV1 slowly; 3 Shut down original water pump P1. 5.2.2 Auto-control PDF ???? "pdfFactory Pro" ?????? www.fineprint.cnHangzhou Tianchuang Waterpure Equipment Co., Ltd Tel: +86-571-86989169 Fax: +86-571-88620836 www.hztianchuang.com Under auto-control, the equipment will shut down automatically or can’t run automatically when one of the follows occurs, 1 Water pumps don’t get the run order, or the switch isn’t set at auto state; 2 Inlet or outlet production pressure of water is too high. 5.2.3 Long time stop 1 If the device needs short-term stop for 2-3 days, it can run 30 ~ 60min every day to prevent bacterial contamination. 2 If the device needs long time stop (more than 7 days), take a manual gas-water anti-washing before the stop; inpour protection solution (1% Sodium bisulfite solution), then shut all the import and export of valves of the device. Check the pH of protection solution, if pH=3, the solution needs to be exchanged. 3 Restart after long time stop, needing constantly wash until no bubble in drainage water. 4 During the stop, the ultra-filtration membrane should be kept wet. If it is not, irreversible damage will be caused. Attention: During the long time stop, please ensure the power input and output of electrical control cabinet shut. Warning: PUF hollow fiber ultra-filtration membrane should be wet at any time. Membrane will get irreversible damage if it gets dry. 5.3 Operation guide In order to make safe and stable operation of ultra-filtration devices, four conditions must be met-- appropriate technology options, water quality qualified, suitable cleaning time interval and timely chemical cleaning. Anyone of them is not fulfilled will causes that the device can’t product stable filtration water in need. 5.3.1 Water quality requirements Inlet water quality requirements has been given in detail in former, control of these indicators has been made to avoid impurities on the membrane causing serious pollution of the membrane. In the process of membrane filtration, membrane pollution is a problem often encountered in. Here pollution means particles, colloidal particles, organic matter and microorganisms, such as solute molecules, having reactions with the membrane in physical, chemical or mechanical, which causes membrane hole or surface adsorption. Precipitation make membrane hole small or blocked, leading to separation of water volume or capacity decline. 5.3.1.1 Membrane pollution Membrane pollution mainly divides into membrane surface contamination and fiber pore inner clogging. Membrane surface contamination was roughly double layer structure,the upper layer is loose layer of larger particles,close to the membrane surface is the small size of the gel layer. Under normal circumstances,loose layer hasn’t a big impact on the PDF ???? "pdfFactory Pro" ?????? www.fineprint.cnHangzhou Tianchuang Waterpure Equipment Co., Ltd Tel: +86-571-86989169 Fax: +86-571-88620836 www.hztianchuang.com membrane performance, and it will be washed off under flow shear stress. The subtila layer on the surface of the membrane has a greater impact on the membrane’s function. Because of the pollution layer, a large number of film hole was covered, and the reciprocity of the particulates in the layer and the impurity may gel into a cake, which increases water resistance. Film hole plug means Fine particles into the film hole or the inner wall of film hole adsorbing organic impurities, such as the formation of precipitation. This phenomenon is irreversible. 5.3.1.2 Pollutant Pollutants are different by liquid handling. They are approximately divided into several types as follows, 1 Colloid pollution , it mainly appears in surface water. Large amount of suspended solids such as clay, silt, such as colloids, are distributed in water, which is great danger to membrane. During the filtration, a large amount of colloids held by membrane may form gel layer or even block the water channel causing irreversible change. Besides, Fe, Mn and the iron-based, aluminum-based coagulant colloid also may form gel layer on the surface of membrane. 2 Organic pollution, some are artificial accession, like Surfactants, cleaning agents and high polymer flocculants; some are in the natural water, like humic acid, tannic acid, etc. These materials may absorb on the membrane surface and destroy its performance. 3 Microbial contaminations, is also a risk factor for long time run. Some nutrition substance left on the surface of membrane, leading to rapid reproduction of bacteria. Live bacteria and their excrement stick to the membrane, combine with other precipitates, consist a complicated cover layer. The result is impact on the amount of permeable membrane and irreversible damage. 5.3.2 Flux 5.3.2.1 Production water flow Production of water flux is according to inlet water quality. That is because membrane has limit load to different material cut-off. Over loading will cause sharp decline of membrane flux. 5.3.2.2 Anti-wash flow The larger the anti-wash flow is , the better the result will be. But in the large anti-wash flow, high water pressure will be on inner wall of hollow fiber membrane, which will lead to deformation and rupture. So anti-wash flow is controlled by water pressure. Ultra-filtration rate of anti-washing water is 50~100L/m2.h,anti-water pressure washing should be at 2~3bar. 5.3.2.3 Inlet gas PDF ???? "pdfFactory Pro" ?????? www.fineprint.cnHangzhou Tianchuang Waterpure Equipment Co., Ltd Tel: +86-571-86989169 Fax: +86-571-88620836 www.hztianchuang.com PUF anti-gas water wash is for strengthen the effect of flushing and anti-wash water-saving. The compressed gases make the water of fiber shake which makes the surface pollutant of the membrane fibers off and flush with the water. But too strong airflow will cause fiber membrane rupture. Inlet gas per membrane module is 2~10Nm3/h,inlet gas pressure should be at 1.0bar, not over 2.0bar at the most. 5.3.3 Anti-wash internal time PUF normally takes full-flow filtration mode. To ensure membrane flux doesn’t occur big decline, PUF takes frequent-wash technology. The frequency is determined by the kind and amount of impurity in inlet water. Commonly it needs to be debugged and adjusted during the run, for 15~60 minutes. 5.3.4 Operating pressure 1 Transmembrane pressure (TMP) 2.0bar at the most 2 Inlet water pressure PUF 4bar at the most 3 Anti-wash pressure see “5.3.2.2” , =3bar 4 Anti-gas-water inlet pressure washing see “5.3.3.3” , 1bar, not over 2.5 bar 5.3.5 Inlet water temperature There’s obvious relationship between production of water flux and water temperature. Conversion formula see “4.2”. 5.3.6 Records of operating data Basically, ultrafiltration device doesn’t need any maintain. The key is to take proper operating parameters. Necessary records of operating data are good for monitoring run situation and finding problem. The parameters following need to be record every two hours. l Water temperature (?) l Water pressure (bar) l Producing water pressure (bar) l Producing water flow (m3 / h) l Concentrated water discharge flow(m3/h) (When the cross-flow filtration) propose that the following parameters are measured every week , l Influent COD (mg / L) l Producing water COD (mg / L) l Water turbidity l Other parameters of the middle water turbidity,like SDI , determines testing frequency according to operational requirements. Estimate the degree of module pollution PDF ???? "pdfFactory Pro" ?????? www.fineprint.cnHangzhou Tianchuang Waterpure Equipment Co., Ltd Tel: +86-571-86989169 Fax: +86-571-88620836 www.hztianchuang.com through monitoring flux and the corresponding pressure drop. Flow under unit pressure=standardization production of water in conversion (25?)/ transmembrane pressure(TMP). Draw curve taking time every day as abscissa, producing water pressure coefficient as ordinate. If the curve shows 20% decline in compared to the start, adjustment of the operating parameters is needed. PUF ultrafiltration membrane module needs to be cleaned with correct formula. 5.4 PUF ultrafiltration device control process 5.4.1 Synopsis Due to frequent use of anti-washing techniques, PUF ultra filtration membrane module is commonly set as manual/auto mode. There are 3 run states, to be activated state, work state and flushing state. 1 To be activated state In this state, all the valves are closed. 2 Work state Ultra filtration device make qualified water production. 3 Flushing state Ultra filtration device starts anti-wash pump and relevant valves in a certain period of time for each interval to flush the ultra filtration membrane on both sides to recover flux attenuation caused by pollution. When several ultra filtration device work in parallel connection, each entering flushing state has a certain period of time difference to ensure the stable water supply outside system. 5.4.1.1 Manual control Start, stop, and wash manually through the operator. 5.4.1.2 Auto control Auto control function is accomplished by PLC. When the device has just connected to electricity, it is in to be activated state. When it is power off, water supplying pump and metering pump will stop, and all the valves will be shut down. When the power is on again, the device will be in to be activated state again. 5.4.1.3 Device closure conditions 1. Site or remote PLC platform requirements; 2. Water supplying pump malfunctions or the switch isn’t put at “AUTO”; 3. Control valve malfunctions or the switch isn’t put at “AUTO”; 4. Over high inlet water pressure; 5. Over high water production back pressure. 5.4.2 Locking device or alarm Alarm set point is within the field instrument. Meter output switching signal or 4~20mA is transmitted to PLC. PLC alarms and locks the system. PDF ???? "pdfFactory Pro" ?????? www.fineprint.cnHangzhou Tianchuang Waterpure Equipment Co., Ltd Tel: +86-571-86989169 Fax: +86-571-88620836 www.hztianchuang.com PUF ultra filtration device locking chain Ultra-filtration device set-point Inlet water pressure is too high Settings Normal inlet water pressure+1.0 bar Locking chain content Alarm activated, the device turn into “to be activated” state 1 Locking chain delay Alarm activation delays for 3 seconds, 10 seconds later the device turn into “to be activated” state Ultra-filtration device set-point Outlet water pressure is too high Settings Normal outlet water pressure+0.5 bar Locking chain content Alarm activated, the device turn into “to be activated state” 2 Locking chain delay Alarm activation delays for 3 seconds, 10 seconds later the device turn into “to be activated” state Ultra-filtration device set-point Low level of sodium hypochlorite plus kits Settings Minimum distance from the bottom of the vessel is 7cm Locking chain content Alarms, metering pump stops. Operator adds sodium hypochlorite to the plus kits 3 Locking chain delay Ultra-filtration device is in “work” state PDF ???? "pdfFactory Pro" ?????? www.fineprint.cn