Chinese Academy of Sciences

Jianlin Li

Yi Shi

Xin Chen

Bin Huang

Disclosed is a modified activated sludge-based two-compartment treatment method for processing nitrate-contaminated drinking water. Raw water is firstly sent to a first TiO-modified denitrifying activated sludge bioreactor (), wherein organic carbon source is added in a controlled amount, and nitrate is partly reduced with nitrite being accumulated. Then, the effluent from the first bioreactor is sent to a second TiO-modified denitrifying activated sludge bioreactor (), wherein organic carbon source and hydrogen gas are supplemented, and remaining nitrate and accumulated nitrite are reduced to nitrogen gas. The denitrified effluent from the second bioreactor is sent to a settling tank (), and TiO-containing precipitates collected from the settling tank receive sequential alkaline and acidic treatment before being injected into the first bioreactor () for TiOrecycling. The effluent from the settling tank (), after having been subjected to ozone disinfection and activated carbon filtration, has suitable pH and bicarbonate alkalinity, and the concentrations of nitrate, nitrite and water soluble organics meet the safety standard for drinking water. Also disclosed is a modified activated sludge-based two-compartment treatment device for processing nitrate-contaminated drinking water.

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Liaoning, China

Jianlin Li