activated sludge effluent Articles
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Membrane foulants and fouling mechanisms in microfiltration and ultrafiltration of an activated sludge effluent
Membrane fouling in microfiltration (MF) and ultrafiltration (UF) of an activated sludge (AS) effluent was investigated. It was found that the major membrane foulants were polysaccharides, proteins, polysaccharide-like and protein-like materials and humic substances. MF fouling by the raw effluent was governed by pore adsorption of particles smaller than the pores during the first 30 minutes of ...
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Membrane foulants and fouling mechanisms in microfiltration and ultrafiltration of an activated sludge effluent
Membrane fouling in microfiltration (MF) and ultrafiltration (UF) of an activated sludge (AS) effluent was investigated. It was found that the major membrane foulants were polysaccharides, proteins, polysaccharide-like and protein-like materials and humic substances. MF fouling by the raw effluent was governed by pore adsorption of particles smaller than the pores during the first 30 minutes of ...
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Forward osmosis membrane fouling and cleaning for wastewater reuse
Membrane fouling properties and different physical cleaning methods for forward osmosis (FO) and reverse osmosis (RO) laboratory-scale filtration systems were investigated. The membrane fouling, with respect to flux reduction, was lower in FO than in RO when testing an activated sludge effluent. Cross-flow velocity, air-scouring, osmotic backwashing and effect of a spacer were compared to ...
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NDMA formation potential removal in treated effluent by UV/H2O2 process
NDMA formation from treated wastewater is one of the concerns in water reuse. This study focused on NDMA formation potential (NDMAFP) removal in wastewater treated effluent by UV/H2O2 technology. A UV/H2O2 system was tested for the removal performance on both organic precursors and NDMAFP. The system consisted of a low pressure ultra-violet (LPUV) with an intensity of 2 mW/cm2 and a H2O2 ...
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An innovative hydrodynamic separation technology (HDS) for water pretreatment: harvesting neutrally buoyant particles effectively
This paper describes the feasibility and application of a fluidic-based technology, called hydrodynamic separation (HDS), to separate suspended particles from liquid. It uses customized fluid flow patterns in a curved channel to create a pair of Dean vortexes that focus particles into a concentrated band near one channel wall. A splitter at the end of the channel divides the flow into a clean ...
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Effects of photocatalytic pre-treatment of penicillin G formulation effluent on its toxicity and biotreatability
The effect of Fenton-like and photo-Fenton pre-treatment on the toxicity and biodegradability of Procaine Penicillin G (PPG) antibiotic formulation effluent was investigated. Fifty-six percent and 44% COD removal efficiencies were obtained and the BOD5/COD ratio increased from 0.10 to 0.45 and from 0.10 to 0.24 after application of photo-Fenton and Fenton-like processes, respectively. Overall TOC ...
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Sludge Respirometry at Avecia, Grangemouth
Untitled Document Avecia is now using the Strathkelvin Activated Sludge Respirometer in its effluent management programme, at its Grangemouth site. Avecia was formed by a buyout of the speciality chemicals section of AstraZeneca in 1999. It now operates from 28 sites worldwide. Grangemouth is the main manufacturing site in the UK, specialising in fine ...
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Process performance evaluation of the contact stabilisation system at Birzeit University
The purification capacity of the contact stabilisation system at Birzeit University campus has been studied for two years. The oxidation capacity of organic matter, ammonium oxidation, and denitrification potential were determined. The reduction of chemical oxygen demand (COD) was 85%, and the effluent COD concentration was less than 110 mg/l (the average value was 88 mg/l). Suspended solids were ...
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Use of external carbon sources derived from biowaste for short-cut nutrient removal from anaerobic effluents
This work evaluated the use of different external carbon sources to promote the via-nitrite nutrient removal from anaerobic effluents. The carbon sources consisted of fermentation liquid produced from the organic fraction of municipal solid waste (OFMSW FL), drainage liquid produced from OFMSW, fermentation liquid produced from vegetable and fruit waste (VFW FL) and acetic acid. Denitritation ...
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Rapid quantification of bacteria and viruses in influent, settled water, activated sludge and effluent from a wastewater treatment plant using flow cytometry
As microbiological parameters are important in monitoring the correct operation of wastewater treatment plants and controlling the microbiological quality of wastewater, the abundances of total bacteria (including intact and damaged bacterial cells) and total viruses in wastewater were investigated using a combination of ultrasonication and flow cytometry. The comparisons between flow cytometry ...
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Ultrasonic irradiation of activated industrial sludge
Sludge is a by-product of wastewater treatment and contains multitude of pollutants. In the present study, irradiation with ultrasound as treatment technique was carried out to treat complex effluent paper sludge, sugar sludge and sewage sludge samples from different industrial places. Wastewater samples were treated in ultrasonic bath at 25 kHz for different time periods of 5 min, 10 min, 20 min ...
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Co-epuration of winery and pesticides effluents, activated sludge with tertiary nanofiltration, two new technologies for pesticides effluents treatment
Wine-related activities produce significant volumes of wastewater characterized by high concentrations in organic matter. The term of pesticides effluents defines the water coming from the emptying and the rinsing of the equipment used to pulverize the phytosanitary products on the vines. Pesticide pollution of surface waters from vineyards applications represents a considerable hazard for the ...
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In-situ measurement of ammonium and nitrate in the activated sludge process
Abstract: A new in-situ probe is presented for the continuous measurement of ammonium and nitrate in wastewater. It requires no sample preparation and is installed directly in the process liquid. This new low- cost probe significantly reduces investment and operating costs and requires minimum maintenance. The paper describes the sensor principle and test results from three different probe ...
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Recovery of reusable water from sewage using aerated flat-sheet membranes
Continuous developments and advances in membrane technology allow recovering to large extent reusable water from untraditional water sources, such as municipal effluents. In this paper, operational results and preliminary cost-analysis of a microfiltration (MF) process used for raw sewage and secondary effluent polishing are given. The research was conducted with a 22 sandwich-type flat-sheet ...
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Actual scale experiment of selector application and the situation of bulking sludge problem in southern Thailand
Activated Sludge Process (ASP) was applied to effluent from factories in southern Thailand. To increase their treatability using a limited land area for the treatment plant, the ASP was mainly designed for carbon removal. A survey of 17 wastewater treatment plants, in the concentrated latex rubber and seafood industries, was conducted. An actual scale experiment of selector application was ...
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Determining potential indicators of
Cryptosporidium oocysts throughout the wastewater treatment processMost research on wastewater treatment efficiency compliance focuses on physicochemical and microbial indicators; however, very little emphasis has been placed so far on determining suitable indicator organisms to predict the discharge level of pathogens from treatment plants. In this study, raw wastewater, activated sludge, and the resulting final effluents and biosolids in four municipal ...
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UV disinfection of wastewater flocs: the effect of secondary treatment conditions
Activated sludge flocs that are carried to the final effluent can significantly decrease the effectiveness of ultraviolet (UV) disinfection of wastewater. This effect is detected in a typical UV dose–response curve, where at higher UV doses there is a decrease in the inactivation rate (tailing). In this study, the effect of activated sludge process conditions on the UV inactivation ...
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Biodegradation of Cypermethrin by pseudomonas in a batch activated sludge process
The biodegradation of Cypermethrin (20 to 125 mg/L) in an effluent using batch activated sludge was studied. Degradation was found to occur to a great extent only in the presence of Pseudomonas (IES-Ps-1) culture. Under aerobic conditions using mechanical aerators, Cypermethrin (20 mg/L) was almost completely degraded in just over 48 h at ambient temperature. Further loading of organic compound ...
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Evaluation of acute ecotoxicity removal from industrial wastewater using a battery of rapid bioassays
The present study compares conventional wastewater treatment technologies (coagulation–flocculation and activated sludge) and powdered activated carbon (PAC) treatment for the removal of acute ecotoxicity from wastewater generated by tank truck cleaning (TTC) processes. Ecotoxicity was assessed with a battery of four commercially available rapid biological toxicity testing systems, ...
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Integrated assessment of wastewater treatment plant effluent estrogenicity in the Upper Murray River, Australia, using the native Murray rainbowfish (Melanotaenia fluviatilis)
The contamination of major continental‐river systems by endocrine‐active chemicals (EACs) derived from the discharge of wastewater treatment plant (WWTP) effluents can impact human and ecosystem health. As part of a long‐term effort to develop a native fish model organism for assessment of endocrine disruption in Australia's largest watershed, the Murray‐Darling River Basin, the present study ...
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