chlorine testing Articles
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High range chlorine testing – what are the options?
Higher range chlorine solutions are typically used for disinfecting products but standard chlorine meters often cannot measure to higher ranges. For example the Hach Pocket Colorimeter II for chlorine measures to a maximum of 2mg/L, and the MD100 Duo for Chlorine measures to a maximum of 8mg/L There are several instruments available for samples where chlorine levels are high, lets take a look ...
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DelAgua Case Study - Harikar NGO and CARE in Northern Iraq
Harikar NGO are working with CARE to provide water quality testing in camps for IDPs (Internationally Displaced People), in Northern Iraq. CARE have carried out a 2-day training course with Harikar field staff on the DelAgua Kit so they are able to carry out weekly bacteriological testing. Harikar have previously been carrying out Free Residual Chlorine testing inside the camps to check if it is ...
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NOM reactivity with chlorine in low SUVA water
Natural organic matter (NOM) in surface water with low specific UV absorbance in Tianjin, China, was fractionated using XAD resins and ultra-filtration membranes into different groups based on hydrophobicity and molecular weight (MW), respectively. The effects of the pre-chlorination process on each fraction were also studied. The hydrophilic acid (HPIA) fraction was the main organic component of ...
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Water quality products magazine features ITS
The decision for a company to seek approval from the U.S. Environmental Protection Agency (EPA) on a product can be beneficial in the long run, but the road to get there may be a long one. In August 1998, Industrial Test Systems (ITS) began its journey on the path to EPA approval for its Sensafe Free Chlorine Water Check test strips. After many outside studies, research, testing and reporting, ...
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An investigation on physical, chemical, and bacteriological quality of municipally supplied and well waters of the towns and city centre in the province of Nigde, Turkey
Physical, chemical, and bacteriological properties of municipally supplied water and well water in selected towns and the city centre (Ni de, population 76,000) of the province of Ni de, located in central Anatolia, in Turkey, were investigated in this study. A composition of 70 samples were collected, 31 from Ni de city centre; 17 from Bor; 8 from Ulukı la; 6 from Altunhisar; 6 from iftlik ...
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Effect of wastewater chlorination on endocrine disruptor removal
Endocrine disrupting chemicals (EDCs) are compounds of mainly anthropogenic origin that interfere with the endocrine system of animals and humans thus causing a series of disorders. Wastewater treatment plants are one of the major routes for transporting such chemicals to the water courses. In the context of this study, several chlorination batch tests were performed in order to assess the ...
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Accuracy, precision, usability, and cost of free chlorine residual testing methods
Chlorine is the most widely used disinfectant worldwide, partially because residual protection is maintained after treatment. This residual is measured using colorimetric test kits varying in accuracy, precision, training required, and cost. Seven commercially available colorimeters, color wheel and test tube comparator kits, pool test kits, and test strips were evaluated for use in ...
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Shining a new light on de-chlorination - Case Study
In collaboration with a UK Utility company, atg UV constructed an independently reviewed de-chlorination test rig and trial at its Lancashire headquarters in January of this year. Barry Hopton of atg UV Technology discusses with WWT how portable UV systems can provide a more efficient and proven alternative to de-chlorination of drinking water. The Water Industry is Changing its ...
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Quality and disinfection trials of consumption water in storage reservoirs for rural area in the Marrakech region (Assif El Mal)
Traditional reservoirs for water storage are important systems of water supply in rural areas of Morocco. These reservoirs are fed by rainwater and/or directly from rivers through open channels; the stored water is used without any treatment as drinking water by the surrounding population. The present study aimed to assess the physicochemical and bacteriological quality of stored water and the ...
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THM Removal in Two 300,000 Gallon clearwells - Case study
Greater than 60% THM reduction observed Topics: clearwell, certified tests, chlorine, trihalomethane reduction, stratification System Overview: Water flows in series through Clearwell #1 to # 2, then onto distribution. Tank / Reservoir Build Information: Tank Type: Two (2) Identical, Cylindrical, Steel GST Tank Size (Gallons): 300,000 Height (ft.): 16.75 Diameter (ft.): 58 Roof Type: ...
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Elution of bisphenol A and its chlorination by-products from lined pipes in water supply process
Elution of bisphenol A (BPA), chlorinated BPAs (i.e., 3-chlorobisphenol A, sum of 3,5-dichlorobisphenol A and 3,3′-dichlorobisphenol A, 3,3′,5-trichlorobisphenol A, and 3,3′,5,5′-tetrachlorobisphenol A) and 2,4,6-trichlorophenol (TCP) from lined pipes coated with two epoxy resins were investigated in a 24-month continuous test passing tap water. BPA, chlorinated ...
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Oxidative transformation of oxcarbazepine by Cl2, ClO2 and O3: characteristics and pathways
In this research, the degradation efficiency, mechanism and intermediates’ toxicities of oxcarbazepine (OXC) upon chlorination, chlorine dioxide oxidation and ozonation were investigated. Results showed that three degradation approaches followed second-order kinetics, and ozonation had the highest removal efficiency both of OXC and dissolved organic carbon (DOC). Reaction intermediates were ...
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Biological drinking water treatment Hong Kong
The water treatment works takes water from the river Dongjiang in the Guangdong Province north of Hong Kong. The raw water has an average turbidity level of around 11 NTU and contents, among other things, ammonia and manganese. Water temperatures range from 12 to 34oC. During planning of the waterworks use of primary aerated biological filters (PABF) was selected for removal of ammonia and ...
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Efficacy of chlorine, chlorine dioxide and ultraviolet radiation as disinfectants against plant pathogens in irrigation water
Abstract A number of disinfection treatments are available to treat irrigation water to reduce the risk of plant disease. However, limited published studies had compared the efficacy of disinfection treatments on a range of plant pathogen species, on their various life stages and in different water qualities. In this study, propagules (spores, mycelium, cells) of eight plant pathogens including ...
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Trihalomethane (THM) Removal in a Clearwell - Case Study
60% reduction of total THMs achieved. No more worries about EPA compliance. Topics: clearwell, certified tests, chlorine, trihalomethane reduction, stratification System Overview: This is a two (2) clearwell system with water flow in series through Clearwell #1, Clearwell #2, then to distribution. Clearwell Build Information: Tank Type: Two identical partially buried concrete tanks Tank ...
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Chlorine mystery solved
Following the installation of in-pipe drinking water quality monitoring sondes, distribution engineers discovered an occasional significant disparity between the Intellisondes’ data and results from grab samples tested by a photometer tablet (DPD) method. For most of the time, there was close agreement between the two methods, but periodically, the photometer results varied wildly, whilst ...
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Influencing factors in the occurrence of injured coliforms in the drinking water distribution system in the city of La Plata, Argentina
The objective of this study was to evaluate the influencing factors in the occurrence of coliforms in the drinking water in La Plata (Argentina) from June 1999 to June 2001. A total of 180 samples were collected from Rio de La Plata (102 samples) and Puelche Aquifer (78 samples); 45 samples were collected for each of the four seasons. The membrane filter procedure was used for isolating bacteria, ...
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Use of a Magnetic Ion Exchange Resin to Improve DBP Precursor Removal and Reduce Coagulant Usage at Lee County`s OLGA WTP
The 5 MGD Olga WTP in Lee County, Ft Myers, treats water from the Caloosahatchee River where TOC and color levels range from 15-25mg/L and 80-350 Pt Co Units respectively. This surface water presents many treatment challenges and treatment costs are high with alum doses in excess of 200mg/L required during times of the year to provide an adequate treated water quality. As part of Lee County’s ...
By Ixom
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Assessing Contaminant Sensitivity of Endangered and Threatened Aquatic Species: Part III. Effluent Toxicity Tests pp
Toxicity tests using standard effluent test procedures described by the U.S. Environmental Protection Agency were conducted with Ceriodaphnia dubia, fathead minnows (Pimephales promelas), and seven threatened and endangered (listed) fish species from four families: (1) Acipenseridae: shortnose sturgeon (Acipenser brevirostrum), (2) Catostomidae, razorback sucker (Xyrauchen texanus), (3) ...
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Lessons from the Field - Chemical free sanitation: Schreurs & Sons Case study
Schreurs & Sons are a family horticultural business based in Clyde, Victoria. What started off as a small family business three generations ago, is today a business spanning seven properties and multiple product lines, including fresh and prepack celery and leek; and baby leaf (including spinach, rocket and snow pea tendrils). Throughout this growth across the business, Schreurs have remained ...
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