scholarly journals Application of microfiltration–nanofiltration combined technology for drinking water advanced treatment in a large-scale engineering project

2021 ◽  
Author(s):  
Mu Liu ◽  
Shaohua Wang ◽  
Tongchun Wang ◽  
Mengyuan Duan ◽  
Yingqiang Su ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Large Scale ◽  
Removal Rate ◽  
Drinking Water Treatment ◽  
Advanced Treatment ◽  
Treatment Technology ◽  
Engineering Project ◽  
Pilot Testing ◽  
Water Plant

Abstract By analyzing and comparing the pressurized-pot microfiltration (MF) system and the ultrafiltration membrane as the pretreatment technology of the nanofiltration (NF) system through pilot testing, the research demonstrates the feasibility of combined technology of NF with pressurized-pot MF for the practical application in engineering. The testing result indicates that the combined technology performs over 90% removal rate for organic substances and humus (UV254) and 70–80% removal rate for disinfection by-products including chloroform, bromoform and carbon tetrachloride. In addition, the combined technology also shows 70% minimum removal rate for pigments including chlorophyll and phycocyanobilin, 20–60% removal rate for water hardness, over 95% removal rate for sulfates which occupies the major part of bivalent salts, and 50–70% removal rate for odorous substances. Based on the pilot testing results, a new water purification process, which is sequentially combined by the conventional drinking water treatment technology, pressurized-pot MF and NF, is creatively applied in the large-scale engineering project of drinking water advanced treatment of Zhangjiagang Third Water Plant for the first time in China. The designed water-production amount of this project is 100 thousand tons per day, and the project is aimed at reforming and upgrading the drinking water treatment technology which is currently used in the Zhangjiagang Third Water Plant. The recovery rate of the NF system applied in the project is able to reach 90%, and the predicted electricity consumption of pressurized-pot MF system and NF system is, respectively, 0.003 and 0.197 kWh/ton of water. After accomplishing the project, Zhangjiagang Third Water Plant will be capable of supplying drinking water with higher quality and will simultaneously possess higher capability of replying to water contamination emergencies.

scholarly journals Nitrogen-metabolising Microorganism Analysis in Rapid Sand Filters From Drinking Water Treatment Plant by Culturing and Metagenomics

2021 ◽  
Author(s):  
Qihui Gu ◽  
Jun Ma ◽  
Jumei Zhang ◽  
Weipeng Guo ◽  
Huiqing Wu ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Removal Rate ◽  
Treatment Plant ◽  
Drinking Water Treatment ◽  
Water Treatment Plant ◽  
Amplicon Sequencing ◽  
Metabolic Model ◽  
Rrna Gene ◽  
N Removal

Abstract Sand filter (SFs) are common treatment processes for nitrogen pollutants removal in drinking water treatment plants (DWTPs). However, the mechanisms on the nitrogen-cycling role of SFs are still unclear. In this study, 16S rRNA gene amplicon sequencing was used to characterise the diversity and composition of the bacterial community in SFs from DWTPs. Additionally, metagenomics approach was used to determine the functional microorganisms involved in nitrogen cycle in SFs. Our results showed that Proteobacteria, Acidobacteria, Nitrospirae, and Chloroflexi dominated in SFs. Subsequently, 85 high-quality metagenome-assembled genomes (MAGs) were retrieved from metagenome datasets of selected SFs involving nitrification, assimilatory nitrogen reduction, and denitrification processes. Read mapping to reference genomes of Nitrospira and the phylogenetic tree of the ammonia monooxygenase subunit A gene, amoA, suggested that Nitrospira is abundantly found in SFs. Furthermore, according to their genetic content, a nitrogen metabolic model in SFs was proposed using representative MAGs and pure culture isolates. Quantitative real-time polymerase chain reaction (PCR) showed that ammonia-oxidising bacteria (AOB) and archaea (AOA), and complete ammonia oxidisers (comammox) were ubiquitous in the SFs, with the abundance of comammox being higher than that of AOA and AOB. Moreover, we identified a bacterial strain with a high NO3-N removal rate as Pseudomonas sp., which could be applied in the bioremediation of micro-polluted drinking water sources. Our study provides insights into functional nitrogen-metabolising microbes in SFs of DWTPs.

Adequacy analysis of drinking water treatment technologies in regard to the parameter turbidity, considering the quality of natural waters treated by large-scale WTPs in Brazil

2019 ◽  
Vol 191 (6) ◽  
Author(s):  
Lívia Duarte Ventura Melo ◽  
Elizângela Pinheiro da Costa ◽  
Carolina Cristiane Pinto ◽  
Gabriela Rodrigues Barroso ◽  
Sílvia Corrêa Oliveira
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Large Scale ◽  
Natural Waters ◽  
Drinking Water Treatment ◽  
Treatment Technologies

scholarly journals Potential Repair of Escherichia coli DNA following Exposure to UV Radiation from Both Medium- and Low-Pressure UV Sources Used in Drinking Water Treatment

2002 ◽  
Vol 68 (7) ◽  
pp. 3293-3299 ◽  
Author(s):  
J. L. Zimmer ◽  
R. M. Slawson
Keyword(s):  
Escherichia Coli ◽  
Drinking Water ◽  
Water Treatment ◽  
Uv Radiation ◽  
Drinking Water Treatment ◽  
Low Pressure ◽  
Plate Count ◽  
Treatment Technology ◽  
Medium Pressure ◽  
Uv Lamp

ABSTRACT The increased use of UV radiation as a drinking water treatment technology has instigated studies of the repair potential of microorganisms following treatment. This study challenged the repair potential of an optimally grown nonpathogenic laboratory strain of Escherichia coli after UV radiation from low- and medium-pressure lamps. Samples were irradiated with doses of 5, 8, and 10 mJ/cm2 from a low-pressure lamp and 3, 5, 8, and 10 mJ/cm2 from a medium-pressure UV lamp housed in a bench-scale collimated beam apparatus. Following irradiation, samples were incubated at 37°C under photoreactivating light or in the dark. Sample aliquots were analyzed for up to 4 h following incubation using a standard plate count. Results of this study showed that E. coli underwent photorepair following exposure to the low-pressure UV source, but no repair was detectable following exposure to the medium-pressure UV source at the initial doses examined. Minimal repair was eventually observed upon medium-pressure UV lamp exposure when doses were lowered to 3 mJ/cm2. This study clearly indicates differences in repair potential under laboratory conditions between irradiation from low-pressure and medium-pressure UV sources of the type used in water treatment.

scholarly journals Geosmin and 2-MIB Removal by Full-Scale Drinking Water Treatment Processes in the Republic of Korea

Water ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 628
Author(s):  
Keug Tae Kim ◽  
Yong-Gyun Park
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Large Scale ◽  
Treatment Plant ◽  
Drinking Water Treatment ◽  
Optimal Operation ◽  
Republic Of Korea ◽  
Treatment Processes ◽  
Water Treatment Plants ◽  
The Republic

Due to climate change, population growth, industrialization, urbanization, and water contamination, it is becoming more difficult to secure and supply clean and safe drinking water. One of the challenges many water utilities often face is the taste and odor (T&O) problem in drinking water treatment plants, mostly associated with geosmin and 2-MIB. These representative T&O compounds are mainly produced by the metabolism of blue-green algae (cyanobacteria), especially in summer. In this study, the correlation between algae blooms and T&O compounds was identified in the intake and raw water of a large-scale water treatment plant in the Republic of Korea. The removal efficiency of geosmin and 2-MIB by each treatment process was intensively evaluated. According to the obtained results, ozonation and granular activated carbon (GAC) adsorption were more effective for removing the troublesome compounds compared to other water treatment processes, such as coagulation/flocculation, filtration, and chlorination. Because of their seasonal concentration variation and different removal rates, optimal operation methods need to be developed and implemented for drinking water treatment plants to solve the T&O problems.

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