Abstract
Urban river pollution sources such as Combined Sewer Overflows (CSOs) or Illegally Discharging of Industrial Waste (IDIW) are generally hard to control on-site and cause serious water quality degradation problems across the nation. Therefore developing effective in-situ remediation techniques for urban rivers is of great interest. In this research we combined river reoxygenation, artificial floating island and microbial agents technologies (O-AFI-MA) to developed a comprehensive in-situ remediation technique and obtained water quality data from Sunhe River case study to evaluate its effectiveness. Our discovery indicates that the O-AFI-MA technique effectively improves water quality by reducing chemical oxygen demand (CODCr), total phosphorous (TP), ammonium nitrogen (NH4+-N) level by 45.9%, 61.31, 7.66% respectively and our technique enhances the natural degradation rate by raising the dissolved oxygen (DO) level from 2.8mg/L to 10mg/L upstream. The case study suggests that the sediment accumulation from CSOs and the subsequent internal source release causes great water quality degradation for Sunhe River. We also tested combinatory microbial agents, physical adsorption and multimedia bio-filter bed technologies independently on site to improve the ammonium nitrogen and total phosphorous removal rate of our technique, and the multimedia bio-filter bed is found to be most effective.
Highlights
The treatment of Black and odorous water body has become an important part of improving urban living environment for local people
The water of Sunhe River appears black with violent odor emitting all the year round and the aquatic lifeforms in the river have all deceased, leaving the water untreated poses a threat to health condition of all people living in the vicinity of the river
The pilot study includes several aspects which are the effect of endogenous release from river sediment on the water quality of Sunhe River, the effect of different microbial agent dosage on the improvement of river water quality, and compared several methods to efficiently remove ammonium nitrogen from Sunhe River
Summary
The treatment of Black and odorous water body has become an important part of improving urban living environment for local people. Sunhe River is a typical Black-odor River Water Body located in Beijing. It is a beheaded stream with domestic sewage replacing its source. Sunhe river stream is converged with sewage collected from Kangying community at Beidian sewage treatment plant near the west side of Binhe Road and discharged into Wenyu River after being treated. Almost all parts of the river is contaminated by dense domestic sewage This makes Sunhe River a typical black and odorous water body with milky white appearance and pungent odor.
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