MODIFIED ACTIVATED SLUDGE-BASED TWO-COMPARTMENT TREATMENT METHOD FOR PROCESSING NITRATE-CONTAMINATED DRINKING WATER AND THE DEVICE THEREOF

摘要

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 TiO2-modified denitrifying activated sludge bioreactor (2), 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 TiO2-modified denitrifying activated sludge bioreactor (3), 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 (4), and TiO2-containing precipitates collected from the settling tank receive sequential alkaline and acidic treatment before being injected into the first bioreactor (2) for TiO2 recycling. The effluent from the settling tank (4), 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.

主权项

1. A modified activated sludge-based two-compartment treatment method for processing nitrate-contaminated drinking water, comprises the following steps:
operating a first TiO2-modified denitrifying activated sludge bioreactor in sequencing batch mode with nitrate-containing raw water as the feed, and the addition of mixed organic; carbon sources in a limited amount to partly reduce nitrate and accumulate nitrite; operating a second TiO2-modified denitrifying activated sludge bioreactor with the effluent from said first bioreactor as the feed, and the addition of mixed organic carbon sources and hydrogen gas to support cooperation of heterotrophic and hydrogenotrophic denitrification to completely reduce remaining nitrate and accumulated nitrite to nitrogen gas; settling the denitrified effluent from said second bioreactor in a settling tank for subsequent ozone disinfection and activated carbon filtration to obtain nitrate-removed drinkable water.