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Multiple response optimization of the coagulation process for upgrading the quality of effluent from municipal wastewater treatment plant.

ABSTRACT: To meet the high quality standard of receiving water, the coagulation process using polyferric chloride (PFC) was used to further improve the water quality of effluent from wastewater treatment plants. Uniform design (UD) coupled with response surface methodology (RSM) was adopted to assess the effects of the main influence factors: coagulant dosage, pH and basicity, on the removal of total organic carbon (TOC), NH4(+)-N and PO4(3-)-P. A desirability function approach was used to effectively optimize the coagulation process for the comprehensive removal of TOC, NH4(+)-N and PO4(3-)-P to upgrade the effluent quality in practical application. The optimized operating conditions were: dosage 28?mg/L, pH 8.5 and basicity 0.001. The corresponding removal efficiencies for TOC, NH4(+)-N and PO4(3-)-P were 77.2%, 94.6% and 20.8%, respectively. More importantly, the effluent quality could upgrade to surface water Class V of China through coagulation under optimal region. In addition, grey relational analysis (GRA) prioritized these three factors as: pH?>?basicity?>?dosage (for TOC), basicity?>?dosage?>?pH (for NH4(+)-N), pH?>?dosage?>?basicity (for PO4(3-)-P), which would help identify the most important factor to control the treatment efficiency of various effluent quality indexes by PFC coagulation.

SUBMITTER: Li N

PROVIDER: S-EPMC4870683 | biostudies-literature | 2016 May

REPOSITORIES: biostudies-literature

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Multiple response optimization of the coagulation process for upgrading the quality of effluent from municipal wastewater treatment plant.

Li Na N Hu Yi Y Lu Yong-Ze YZ Zeng Raymond J RJ Sheng Guo-Ping GP

Scientific reports 20160518

To meet the high quality standard of receiving water, the coagulation process using polyferric chloride (PFC) was used to further improve the water quality of effluent from wastewater treatment plants. Uniform design (UD) coupled with response surface methodology (RSM) was adopted to assess the effects of the main influence factors: coagulant dosage, pH and basicity, on the removal of total organic carbon (TOC), NH4(+)-N and PO4(3-)-P. A desirability function approach was used to effectively opt ...[more]

PMID: 27189652

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Project description:Vibrio vulnificus is an opportunistic pathogen indigenous to estuarine and marine environments and associated with aquatic organisms. Vibrio vulnificus is of utmost importance because it causes 95% of the seafood-related deaths in the United States due to rapid progression of septicemia. Changes in environmental parameters associated with climate change and coastal population expansion are altering geographical constraints, resulting in increased Vibrio spread, exposure, and rates of infection. In addition, coastal population expansion is resulting in increased input of treated municipal sewage into areas that are also experiencing increased Vibrio proliferation. This study aimed to better understand the influence of treated sewage effluent on effluent-receiving microbial communities using Vibrio as a model of an opportunistic pathogen. Integrated transcriptomic approaches were used to analyze the changes in overall gene expression of V. vulnificus NBRC 15645 exposed to wastewater treatment plant (WWTP) effluent for a period of 6h using a modified seawater yeast extract media that contained 0, 50, and 100% filtered WWTP effluent. RNA-seq reads were mapped, annotated, and analyzed to identify differentially expressed genes using the Pathosystems Resource Integration Center analysis tool. The study revealed that V. vulnificus responds to wastewater effluent exposure by activating cyclic-di-GMP-influenced biofilm development. Also, genes involved in crucial functions, such as nitrogen metabolism and bacterial attachment, were upregulated depending on the presence of treated municipal sewage. This altered gene expression increased V. vulnificus growth and proliferation and enhanced genes and pathways involved in bacterial survival during the early stages of infection in a host. These factors represent a potential public health risk due to exposure to environmental reservoirs of potentially Vibrio strains with enhanced virulence profiles in coastal areas.

Dataset Information

Multiple response optimization of the coagulation process for upgrading the quality of effluent from municipal wastewater treatment plant.

Publications

Multiple response optimization of the coagulation process for upgrading the quality of effluent from municipal wastewater treatment plant.

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