Modelling chlorinated discharges from water treatment plants: a case study

1991 ◽  
Vol 18 (6) ◽  
pp. 985-994
Author(s):  
S. J. Stanley ◽  
D. W. Smith
Keyword(s):  
Water Treatment ◽  
Environmental Impact ◽  
Control Measures ◽  
Aquatic Biota ◽  
Potential Health ◽  
Stream Pollution ◽  
Transverse Mixing ◽  
Water Treatment Plants ◽  
Toxicity Effects

Virtually all water treatment plants have the ability to discharge chlorinated water back to the source stream. Such water may originate from an emergency bypass, filter backwash water or other diversions. The discharge of chlorinated water to receiving water bodies has caused concern because of its toxicity effects to aquatic biota and potential health hazards. This paper demonstrates the use of a transverse mixing model that incorporates both mixing and pollutant decay in assessing the environmental impact of these discharges. The results of such an analysis can be used to base control measures on, such that environmental impact is minimized and guidelines met. Presented is an impact assessment of chlorinated wastewater discharges from two water treatment plants in Edmonton, Alberta. Key words: environmental impacts, mixing, stream pollution, chlorine decay, water treatment.

scholarly journals Comparison of bioindicator eukaryotes of activated sludge biocenoses on two water-treatment plants: a case study

2017 ◽  
Vol 16 (1) ◽  
pp. 54-60 ◽  
Author(s):  
Farida Y. Achmadulina ◽  
Rustem K. Zakirov ◽  
Elena S. Balymova ◽  
Vera Denisova ◽  
Taťjána Brovdyová ◽  
...  
Keyword(s):  
Waste Water ◽  
Chemical Composition ◽  
Water Treatment ◽  
Activated Sludge ◽  
Waste Water Treatment ◽  
High Water ◽  
Water Treatment Plants ◽  
The City ◽  
Main Factor

Abstract Activated sludge biocenoses were compared on waste-water treatment plants in the city of Kazan, Russian Federation and the city of Teplice, Czech Republic. Based on Palia-Kovnatski index, Acanthamoeba in Kazan, Epistylis in Teplice, and Acanthamoeba and Centropyxis were dominant genera in both plants. The major subdominant generas identified were Arcella, Opercularia and Aspidisca. This indicates high nitrification ability, high water purification potential and matured activated sludge. Chemical composition of the waste-water was identified as the main factor determining the sludge biocenoses diversity. Higher sludge biodiversity (Shannon, Margalef, and Sorensen indexes) was found in Kazan corresponding to more concentrated inflow water.

Emergency management of reservoirs and water treatment plants in typhoon season: a case study of Ningbo

2018 ◽  
Vol 16 (4) ◽  
pp. 364-373 ◽  
Author(s):  
Wei Chen ◽  
Xiaozhong Zhang ◽  
Zhengxie Zhou ◽  
Jianrong He ◽  
Hui Tao ◽  
...  
Keyword(s):  
Water Treatment ◽  
Emergency Management ◽  
Water Treatment Plants ◽  
Typhoon Season

Transition of water demand and treatment plant overcapacity: a case study of the Seoul Metropolitan City, Korea

2010 ◽  
Vol 61 (12) ◽  
pp. 3129-3140 ◽  
Author(s):  
Sangeun Lee ◽  
Heekyung Park
Keyword(s):  
Parameter Estimation ◽  
Water Treatment ◽  
Water Demand ◽  
Recent Trend ◽  
Treatment Plant ◽  
Estimation Method ◽  
Resources Management ◽  
Large Size ◽  
Water Treatment Plants

This study deals with the overcapacity problem of water treatment plants in Korea, and mainly discusses status, causes, and engineering options. To this end, we first statistically analyze the recent trend of demand, revealing that the demands of small- and mid-size systems are still increasing while that of large-size systems is now decreasing. Since the existing approach to plan capacity implicitly assumes that demand will increase at a regular rate, we estimate excess capacities and system utilizations of large-size systems. From these results it is found that the large-size systems are suffering from serious overcapacity, thus necessitating that engineers make very difficult decisions given that systems are still expanding the capacities of plants due to a lack of awareness of the current demand trend. For other systems where there is a better understanding of the transition of demand, planners have ceased to expand plants or have closed down relatively old plants in efforts to reduce O&M costs. To address this problem, quick recognition of the transition of demand is being highlighted by the concepts of integrated resources management and cybernetics. Therefore, we examined how quickly the new trend of the Seoul case could be precisely recognized and appropriately addressed. Using the Bayesian parameter estimation method, we found that a new trend can be recognized six years after the transition of demand.

scholarly journals Plasma Supported Odour Removal from Waste Air in Water Treatment Plants: An Industrial Case Study

2014 ◽  
Vol 14 (3) ◽  
pp. 697-707 ◽  
Author(s):  
Marcin Hołub ◽  
Ronny Brandenburg ◽  
Helge Grosch ◽  
Stefan Weinmann ◽  
Bernd Hansel
Keyword(s):  
Water Treatment ◽  
Industrial Case Study ◽  
Water Treatment Plants ◽  
Waste Air ◽  
Odour Removal

Enhanced particle removal in drinking water treatment plants – case studies

2000 ◽  
Vol 41 (7) ◽  
pp. 135-142
Author(s):  
P. Lipp ◽  
G. Baldauf
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Case Studies ◽  
Surface Waters ◽  
Drinking Water Treatment ◽  
Particle Removal ◽  
Water Production ◽  
Water Treatment Plants ◽  
Drinking Water Production

Measurements of parasites in surface waters in Germany showed that their presence is widely spread. Concentrations may reach values up to a maximum of 50 cysts per 100 l. Normally raw waters used for drinking water production show much lower values. In order to ensure sufficient parasite removal in drinking water treatment plants an enhancement of particle removal is required. For filtration processes parameters influencing particle removal are filter media, filtration velocity, flocculant dosage, preozonationand filter back wash. Moderate filtration conditions show best results. Three case studies show that preozonation, optimized energy input and use of flocculants improve particle removal. One case study shows results of the first ultrafiltration plant in Germany treating reservoir and spring water for drinking water production.

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