Studies on Micro-Polluted Source Water Treatment by Ozone Combined Processes

2011 ◽  
Vol 281 ◽  
pp. 40-44 ◽  
Author(s):  
Jian Kun Zhang
Keyword(s):  
Water Treatment ◽  
Treatment Process ◽  
Quality Characteristics ◽  
Combined Processes ◽  
Source Water ◽  
Combined Process ◽  
Water Treatment Process ◽  
Treatment Processes ◽  
Removal Efficiencies ◽  
Better Than

According to the water quality characteristics, micro-polluted source water treatment by ozone combined processes. The results show that the average removal efficiencies of algae, CODMn, NH4+-N, turbidity, chromaticity by bio-pretreatment filter are 72.0%, 14.5%, 80.5%, 58.6% ,26.0%, respectively; while the whole average removal efficiencies by pre-ozonation tank following bio-pretreatment filter had increased at the different dosages of ozone, such as algae 12.0%, CODMn 19.5% ,NH4+-N 7.5%, turbidity 10.9%, chromaticity 34.5%, respectively; and the optimal dosages of ozone are between 0.7 and 1.5mg/L. Furthermore, compared with the conventional water treatment process, all kinds of combined water treatment processes are better than the conventional one, of which the combined process Ⅲ with granular activated carbon (GAC) adsorption tank is obviously the best, all the average removal efficiencies of algae, CODMn, NH4+-N, turbidity, chromaticity can reach 82%, while whose operation expenditure is higher than any others, so it should be considered comprehensively in the practice.

scholarly journals Optimal Water Backwashing Condition in Combined Water Treatment of Alumina Microfiltration and PP Beads

Membranes ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 92
Author(s):  
Hyungmin Cho ◽  
Gihoon Yoon ◽  
Minjae Kim ◽  
Jin Yong Park
Keyword(s):  
Water Treatment ◽  
Membrane Fouling ◽  
Treatment Process ◽  
Membrane Separation ◽  
Combined Process ◽  
Water Treatment Process ◽  
A Minor ◽  
Membrane Shape ◽  
Tubular Membranes ◽  
Total Membrane

Membrane fouling is a dominant limit of the membrane separation process. In this research, the optimal water backwashing to solve the membrane fouling problem was investigated in the combined water treatment process of alumina MF and pure polypropylene (PP) beads. Additionally, the influence of membrane shape (tubular or seven channel) was examined, depending on the water backwashing period. The optimal backwashing time (BT) could be 20 s in the combined water treatment process, because of the highest total treated volume (VT) in our BT 6–30 s conditions. The optimal backwashing period (BP) could be 6 min, because of the minimum membrane fouling and the maximum VT in the combined process of tubular alumina MF and PP beads. The resistance of reversible membrane fouling (Rrf) showed a major resistance of total membrane fouling, and that of irreversible membrane fouling (Rif) was a minor one, in the combined process using tubular or seven channel MF. The Rif showed a decreasing trend obviously, as decreasing BT from NBW to 2 min for seven channel MF. It means that the more frequent water backwashing could be more effective to control the membrane fouling, especially irreversible fouling, for seven channel membranes than tubular membranes.

Study on Phosphorus and Bacterial Regrowth in Drinking Water

2012 ◽  
Vol 461 ◽  
pp. 466-469
Author(s):  
Deng Ling Jiang ◽  
Yu Min Zhang ◽  
Ning Zheng
Keyword(s):  
Water Treatment ◽  
Distribution System ◽  
Water Distribution ◽  
Treatment Process ◽  
Water Distribution System ◽  
Phosphorus Concentration ◽  
Available Phosphorus ◽  
Source Water ◽  
Bacterial Regrowth ◽  
Water Treatment Process

Phosphorus limitation on bacterial regrowth was studied in source water, water treatment process and water distribution system of J Water Supply Plant in T city, by modified AOC method and MAP analysis. Based on the study, the follows can be concluded: ① MAP(Microbially Available Phosphorus) concentration was higher in source water and water treatment process, which was 5～38µg PO43－-P/L. However in water distribution, MAP concentration was lower, which was less than 5µg PO43--P/L. ②Coagulation and sedimentation can remove MAP efficiently. 31%～68% of MAP can be removed in these process. ③ In source water and water treatment process, there was no evident difference between AOCpotential, AOCp and AOCnative. So assimilable organic carbon (AOC) was the most important factor of bacterial regrowth. In water distribution system, the concentration of AOCpotential and AOCp were 2～8.7 times of the concentration of AOCnative. So phosphorus limited bacterial regrowth.

scholarly journals ENVIRONMENTAL IMPACT OF WATER TREATMENT PROCESS. A SYSTEMATIC REVIEW OF EVALUATION METHOD

2016 ◽  
Vol 22 (3) ◽  
pp. 34-39
Author(s):  
FLORINA FABIAN ◽  
VALENTIN NEDEFF ◽  
MIRELA PANAINTE -LEHADUS ◽  
OANA IRIMIA ◽  
SILVIA RACOVITA
Keyword(s):  
Systematic Review ◽  
Global Warming ◽  
Water Treatment ◽  
Environmental Impact ◽  
Carbon Footprint ◽  
Treatment Process ◽  
Environmental Indicators ◽  
Impact Categories ◽  
Water Treatment Process ◽  
Treatment Processes

In an international context in continuous development, water treatment processes become an important component of society where we live. Attention is directed on water treatment processes in the context of increasing water demand. This study proposes a systematic review of methods for the assessment of the environmental impact of Water Treatment process. The approach is based on the evaluation of LCA, Externalities Evaluation methodology and Carbon Footprint methodology, each of these methods have the environmental indicators able to relate direct and indirect emissions generated by any water treatment process. The present review compares and discusses the implementation of the above-cited methodologies to different case studies. The results in short show that Carbon Footprint only assesses the global warming potential of a water treatment plant, whereas Life Cycle Analysis and assess multiple environmental impact categories, which may include global warming, but also impacts on human health, ecosystems quality, etc. There are different standards and organizations around each assessment. The ExternE method on the contrary aims to quantify external impacts, from both economic and social points of view, to weight each endpoint of the impact categories.

scholarly journals Assessment of waterborne protozoan passage through conventional drinking water treatment process in Venezuela

2012 ◽  
Vol 10 (2) ◽  
pp. 324-336 ◽  
Author(s):  
Walter Q. Betancourt ◽  
Kristina D. Mena
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Water Samples ◽  
Environmental Protection Agency ◽  
Treatment Process ◽  
Drinking Water Treatment ◽  
Source Water ◽  
Raw Water ◽  
Water Treatment Process ◽  
Monitoring Strategies

Three drinking water treatment plants (DWTPs) differing in source water and treatment capacity were investigated for the potential passage of waterborne protozoan (oo)cysts through conventional processing. DWTP I (15,000 L/s), DWTP II (7,500 L/s) and DWTP III (4,300 L/s) provide drinking water for approximately 2.7 million inhabitants of the Metropolitan District of Caracas (Venezuela). The US Environmental Protection Agency Method 1623 for detection of Cryptosporidium and Giardia was used to analyze raw water and finished drinking water samples collected from the three plants. (Oo)cyst recovery efficiencies varied between 23 and 84%. The concentration of confirmed (oo)cysts detected in raw water samples ranged between 1 and 100 per 100 L. (Oo)cyst levels in finished water samples ranged from 2 to 25 per 100 L. These data indicated that the conventional treatment process to produce finished water at two filtration plants was not effective in preventing the passage of protozoan (oo)cysts. Monitoring strategies that include multiple microbial indicators and waterborne pathogens are strongly recommended for accurate source water characterization and for verification of the effectiveness of treatment process barriers to microbial breakthrough in the finished water.

Emergency Treatment Measures for Sudden Pollution Incidents in Source Water with some Contaminants: A Review

2013 ◽  
Vol 781-784 ◽  
pp. 1950-1953 ◽  
Author(s):  
Hong Tao Wang ◽  
Xue Bin Jia ◽  
Dong Mei Liu ◽  
Zhi Wei Wang ◽  
Yun Hao Pan
Keyword(s):  
Organic Matter ◽  
Water Treatment ◽  
Water Purification ◽  
Seasonal Variability ◽  
Emergency Treatment ◽  
Treatment Process ◽  
Source Water ◽  
High Concentration ◽  
Water Treatment Process ◽  
Treatment Measures

Source water polluted by algae, ammonium and organic matter has been studied for many years. Sudden pollution incidents of source water have been reported across the whole country. Seasonal variability of rainfall across China has resulted in floods or droughts, thus incurred the high concentration of algae, ammonium and organic matter, causing severe challenges to the conventional water purification facilities. However, the conventional water treatment process is often unavailable to keep the safety of source water for drinking when sudden pollution occurs. Meanwhile, byproducts are often to be found over the whole treatment process, it is high time that researchers took effective measures to deal with this problem. In the present work, an overview of the recent research dealing with source water suddenly polluted by algae, ammonium and organic matter is presented.

Water treatment process evaluation of wildfire-affected sediment leachates

2017 ◽  
Vol 3 (2) ◽  
pp. 352-365 ◽  
Author(s):  
Amanda K. Hohner ◽  
Leigh G. Terry ◽  
Eli B. Townsend ◽  
R. Scott Summers ◽  
Fernando L. Rosario-Ortiz
Keyword(s):  
Water Treatment ◽  
Process Evaluation ◽  
Treatment Process ◽  
Water Treatment Process ◽  
Treatment Processes ◽  
Sediment Deposits ◽  
Treatment Thresholds ◽  
Runoff Events

Re-suspension of post-fire sediment deposits challenge conventional water treatment processes during runoff events, impacting DBP formation. Treatment thresholds for a range of unit processes are established.

Settling characteristics of problem algae in the water treatment process

2006 ◽  
Vol 53 (7) ◽  
pp. 113-119 ◽  
Author(s):  
S.K. Choi ◽  
J.Y. Lee ◽  
D.Y. Kwon ◽  
K.J. Cho
Keyword(s):  
Water Treatment ◽  
Treatment Process ◽  
Settling Velocity ◽  
Stationary Growth Phase ◽  
Stationary Growth ◽  
Fluorometric Method ◽  
Water Treatment Process ◽  
Treatment Processes ◽  
Synedra Acus ◽  
Settling Column

The settling velocity or removal rates of problem algae in the water treatment process and their flocculants were measured with settling column (SETCOL) and fluorometric method. Our research who were centred on the algal density and shape affecting the settling. The settling velocities of large algae ranged from 0.1 cm/h to 2.6 cm/h, whereas those of small algae were below 1.0 cm/h. The settlings of algae in the stationary growth phase significantly increased and dead algae corresponded with the declining algae. The extent of deformation, which was expressed as the coefficient of form resistance of the algae had the great influences upon the settling. The most extreme deformed algae were needle-shaped ones like Synedra acus, which was known to be a problem in water treatment processes in Korea. Changes in the settling velocity of algae were correlated with algal volume and morphology rather than cell density.

scholarly journals ENVIRONMENTAL IMPACT OF WATER TREATMENT PROCESS. A SYSTEMATIC REVIEW OF EVALUATION METHOD

2017 ◽  
Vol 22 (3) ◽  
Author(s):  
FLORINA FABIAN ◽  
VALENTIN NEDEFF ◽  
MIRELA PANAINTE - LEHADUS ◽  
NARCIS BÂRSAN ◽  
OANA IRIMIA ◽  
...  
Keyword(s):  
Systematic Review ◽  
Global Warming ◽  
Water Treatment ◽  
Environmental Impact ◽  
Carbon Footprint ◽  
Treatment Process ◽  
Environmental Indicators ◽  
Impact Categories ◽  
Water Treatment Process ◽  
Treatment Processes

<p>In an international context in continuous development, water treatment processes become an important component of society where we live. Attention is directed on water treatment processes in the context of increasing water demand.<strong> </strong>This study proposes a systematic review of methods for the assessment of the environmental impact of Water Treatment process. The approach is based on the evaluation of LCA, Externalities Evaluation methodology and Carbon Footprint methodology, each of these methods have the environmental indicators able to relate direct and indirect emissions generated by any water treatment process. The present review compares and discusses the implementation of the above-cited methodologies to different case studies. The results in short show that Carbon Footprint only assesses the global warming potential of a water treatment plant, whereas Life Cycle Analysis and assess multiple environmental impact categories, which may include global warming, but also impacts on human health, ecosystems quality, etc. There are different standards and organizations around each assessment. The ExternE method on the contrary aims to quantify external impacts, from both economic and social points of view, to weight each endpoint of the impact categories.</p>

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