scholarly journals Bio-Sand Filter (BSF): A Simple Water Treatment Device for Safe Drinking Water Supply and to Promote Health in Hazard Prone Hard-to-Reach Coastal Areas of Bangladesh

2016 ◽  
Vol 5 (5) ◽  
pp. 109
Author(s):  
A. H. M. Enamul Kabir
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Water Supply ◽  
Coastal Areas ◽  
Drinking Water Supply ◽  
Safe Drinking Water ◽  
Sand Filter

Experiences with the practical implementation and operation of biological nitrification for a small-scale drinking water treatment plant

2016 ◽  
Vol 16 (4) ◽  
pp. 922-930 ◽  
Author(s):  
L. Richard ◽  
E. Mayr ◽  
M. Zunabovic ◽  
R. Allabashi ◽  
R. Perfler
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Water Supply ◽  
Treatment Plant ◽  
Drinking Water Treatment ◽  
Water Treatment Plant ◽  
Drinking Water Supply ◽  
Small Scale ◽  
Treatment Performance ◽  
Biological Nitrification

The implementation and evaluation of biological nitrification as a possible treatment option for the small-scale drinking water supply of a rural Upper Austrian community was investigated. The drinking water supply of this community (average system input volume: 20 m3/d) is based on the use of deep anaerobic groundwater with a high ammonium content of geogenic origin (up to 5 mg/l) which must be treated to prevent the formation of nitrites in the drinking water supply system. This paper describes the implementation and operation of biological nitrification despite several constraints including space availability, location and financial and manpower resources. A pilot drinking water treatment plant, including biological nitrification implemented in sand filters, was designed and constructed for a maximum treatment capacity of 1.2 m3/h. Online monitoring of selected physicochemical parameters has provided continuous treatment performance data. Treatment performance of the plant was evaluated under standard operation as well as in the case of selected malfunction events.

scholarly journals Bacteriological assessment of drinking water supply options in coastal areas of Bangladesh

2011 ◽  
Vol 9 (2) ◽  
pp. 415-428 ◽  
Author(s):  
Md. Atikul Islam ◽  
Hiroyuki Sakakibara ◽  
Md. Rezaul Karim ◽  
Masahiko Sekine ◽  
Zahid Hayat Mahmud
Keyword(s):  
Drinking Water ◽  
Water Supply ◽  
Vibrio Cholerae ◽  
Water Samples ◽  
Disease Burden ◽  
Coastal Areas ◽  
Drinking Water Supply ◽  
Wet Season ◽  
Harvesting Systems ◽  
Shigella Spp

This study was conducted to assess the bacteriological quality of alternative drinking water supply options in southwest coastal areas of Bangladesh. A total of 90 water samples were collected during both dry and wet seasons from household based rainwater harvesting systems (RWHSs), community based rain water harvesting systems (CRWHSs), pond-sand filters (PSFs) and ponds. The samples were evaluated for faecal coliform, Escherichia coli and Heterotrophic Plate Count, as well as Vibrio cholerae, Salmonella spp., Shigella spp. and Pseudomonas spp. Physico-chemical parameters (pH, electrical conductivity, and color) were also examined. In addition, sanitary inspections were conducted to identify faecal contamination sources. All options showed varying degrees of indicator bacterial contamination. The median E. coli concentrations measured for RWHSs, CRWHSs, PSFs, and ponds were 16, 7, 11, and 488 cfu/100 ml during the wet season, respectively. Vibrio cholerae O1/O139, Salmonella and Shigella spp. were not found in any samples. However, Vibrio cholerae Non-O1/Non-O139 and Pseudomonas spp. were isolated from 74.4% and 91.1% of the water samples collected during the wet season. A maximum pH of 10.4 was found in CRWHSs. Estimation of the disease burden for all options in disability adjusted life years (DALYs) showed an increased disease burden during the wet season. According to sanitary inspections, poor maintenance and unprotected ponds were responsible for rainwater and PSF water contamination, respectively. The findings of the present study suggest that alternative drinking water supply options available in southwest coastal Bangladesh pose a substantial risk to public health.

scholarly journals Evaluation of Indicators for Cyanobacterial Risk in 108 Temperate Lakes Using 23 Years of Environmental Monitoring Data

2020 ◽  
Author(s):  
JING LI ◽  
Kenenth M Person ◽  
Heidi Pekar ◽  
Daniel Jansson
Keyword(s):  
Drinking Water ◽  
Water Supply ◽  
Anthropogenic Activities ◽  
Drinking Water Treatment ◽  
Drinking Water Supply ◽  
Cyanobacterial Blooms ◽  
Safe Drinking Water ◽  
Water Treatment Plants ◽  
Monitoring Strategies ◽  
Level 1

Abstract Background: Cyanobacterial blooms are of increasing concern for drinking water supply. Cyanobacterial risk in 108 temperate freshwater lakes were examined for drinking water supply. Results: In Sweden, a survey among drinking water producers showed that the sense of urgency was little. At 60 % of the Swedish drinking water treatment plants, operators lacked monitoring strategies. The study shows that blooms can produce a variety of toxins such as anatoxins, cylindrospermopsins, microcystins and saxitoxins. We confirmed the anthropogenic activities’ impact on cyanobacterial risk and evaluated that total phosphorus (TP) concentration can be used to indicate cyanobacterial risk by applying non-linear quantile regression for 108 Swedish monitoring lakes.Conclusion: We suggest that TP concentration should be investigated thoroughly to provide important knowledge which can be used to set nutrient targets to sustain safe drinking water supply and recreational services.TP should be targeted lower than 15 μg L-1, allowing 10 % exceedance of WHO Drinking Water Alert Level 1.

Sanitary and epidemiological situation in the Lower Volga Region: problems and solutions

2021 ◽  
pp. 28-34
Author(s):  
Л.В. Боронина
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Water Supply ◽  
Distribution Networks ◽  
Drinking Water Supply ◽  
Volga Region ◽  
Volga River ◽  
Lower Volga Region ◽  
Lower Volga

Волга почти на всем протяжении от Твери до Астрахани является истощенным водоемом по качественному составу. По Нижневолжскому бассейну ресурс экологически чистой воды составляет не более 3% общих ресурсов поверхностных вод Астраханской области. В связи с этим в Астраханской области проблемы качества питьевой воды обусловлены загрязнением природной воды, неудовлетворительной очисткой ее на водопроводных станциях, вторичным загрязнением в разводящих сетях. Проведен анализ экологического состояния Нижней Волги, а также оценка его влияния на качество питьевого водоснабжения. Применяемые в Астраханской области технологии очистки воды для водоснабжения запроектированы и построены в 1960–70-е годы и не рассчитаны на грязевую нагрузку по качеству и количеству, значительно отличающуюся от современной ситуации. Проведен анализ работы водозаборных и водопроводных очистных сооружений, который показал, что они находятся в крайне неудовлетворительном техническом состоянии и морально устарели. Предложены пути решения вопросов по улучшению качества питьевого водоснабжения с учетом сложившейся кризисной экологической обстановки на Нижней Волге и мирового опыта. Almost along the entire length from Tver to Astrakhan, the Volga River has been a depleted water reservoir in terms of its qualitative composition. In the Lower Volga basin the resource of ecologically clean water is less than 3% of the total surface water resources of the Astrakhan Region. In this regard, drinking water quality problems in the Astrakhan Region have been caused by natural water pollution, poor water treatment at the waterworks, secondary pollution in the distribution networks. The ecological state of the Lower Volga has been analyzed, and its impact on the quality of drinking water supply has been estimated. The technologies of water purification used in the Astrakhan Region for water supply were designed and implemented in the 1960s–70s; they were not designed for the pollution load in terms of the quality and quantity significantly different from the current situation. An analysis of the operation of water intake and water treatment facilities was carried out that showed their extremely unsatisfactory technical condition and obsolescence. The ways of solving the problems of improving the quality of drinking water supply with account of the current critical ecological situation in the Lower Volga Region and world experience, are proposed.

scholarly journals Using an adaptive approach to the development of water purification system

2020 ◽  
pp. 126-135
Author(s):  
A. P. Levchuk ◽  
V. I. Maksin
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Water Treatment ◽  
Water Supply ◽  
Water Purification ◽  
Power Supply ◽  
Biological Agents ◽  
Drinking Water Supply ◽  
Water Supply Systems ◽  
Adaptive Approach

In terms of water consumption from decentralized water supply systems there are a number of problematic aspects that negatively affect water quality, especially drinking water supply, namely: lack of modern control methods and integrated water treatment systems, qualified service personnel, long logistics of components and reagents, long distances to the final water consumer, inability to respond timely to the need of control laboratory equipment calibration and the failure of units and others. Unpredictable natural or man-made factors further complicate these problematic aspects. All this and the constant changes in the requirements to water quality and technological processes, leads to the search of new, modern approaches to solving such problems and issues of uncentralized drinking water supply. Therefore, this paper analyzes the current experience of developing small autonomous water purification systems for drinking water supply, which do not require constant presence of the operator and laboratory quality control of water and can work automatically in difficult conditions. Also a rationale for technological and structural design as well as the description of adaptive water purification systems using an adaptive approach to the structure as a whole, individual units, assemblies and to the power supply of electrolytic processes, giving it adaptive properties for the use in modern drinking water treatment is provided in the paper. The adaptive function of neutralizing the manifestation of dangerous biological agents and the efficiency of the system is designed for man-made and natural emergencies and water disinfection from bacteria and viruses. The pH was chosen as the main control parameter of water quality. The system uses an effective process of synthesis by electrolytic methods of coagulant, disinfectant and destructive effects on hazardous biological agents - pulsed current with changing parameters and shape. In case a working solution changes the pH, the parameters of the pulsed load current are changed by the adaptive power supply to the most efficient one. The proposed approach and model of the system are effective and preventive and is offered as an option to improve existing water treatment systems for drinking water supply.

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