Classification of contaminants and treatability evaluation of domestic wastewater

Abstract

Long-term sampling and analysis were conducted in a domestic wastewater treatment plant for the investigation on the characteristics of the representative contaminants in raw sewage such as SS, COD, BOD 5 , TP, and TN. All these constituents were classified into dissolved and suspended groups by using a 0.45-µm membrane filter, and the concentration of each constituent in each group was analyzed. As a result, almost 100% of the SS was found to be suspended matter, as well as about 65% of COD, 60% of BOD 5 , 50% of P, and 20% of N. All these could be easily removed by sedimentation or coagulation/sedimentation. A treatability evaluation diagram was proposed for a rational selection of wastewater treatment process in accordance with raw water quality.

Study of the variation of ecotoxicity at different stages of domestic wastewater treatment using Vibrio-qinghaiensis sp.-Q67

“…By coagulation of the raw sewage, the total COD was removed by 67% (from 306 mg l −1 to 100.5 mg l −1 ) but the dissolved COD and TOC were little removed. From the very close values of the total COD and dissolved COD, it can be concluded that the enhanced primary treatment is very effective to remove almost all organic substances attached onto suspended solids [28]. The effective total COD removal resulted in a remarkable reduction of the TII 50 from 50.51% to 7.36%, a much more effective ecotoxicity reduction than that by the grid chamber.…”

A Review of the Role of Extracellular Polymeric Substances (EPS) in Wastewater Treatment Systems

“…Nitrogen and phosphorous are common nutrients in domestic wastewater [65]. The biological phosphorus and nitrogen removal process has been developed for treating wastewater and protecting water against eutrophication [66].…”

Effects of pH Adjustment on the Release of Carbon Source of Particulate Organic Matter (POM) in Domestic Sewage

“…Recent studies have shown that particulate organic matter (POM), which is mainly composed of proteins, polysaccharides, and oils discharged from human activities, in the influent of WWTPs in China accounts for 40% to 60% of the total chemical oxygen demand (TCOD) [4][5][6]. The chemical composition and size distribution of POM will vary greatly with the source of sewage, living habits of residents, economic level, and sewage discharge methods.…”