ANALYSIS OF ODOR SOURCES IN STORMWATER PUMP POOL AND STORMWATER PIPE OF A STORMWATER PUMP STATION IN THE SINO-SINGAPORE TIANJIN ECO-CITY

The malodorous of the external drainage water from stormwater pumping station has a significant impact on the quality of surface water. In this paper, the Qingtuozi stormwater pumping station in the Sino-Singapore Tianjin Eco-city was selected, and the water sample from stormwater pump pool, the water and sludge samples from stormwater pipe, and the water sample of groundwater were collected to analysis the sources of black and odor from its external drainage water. Results indicated that the main pollution indicators or pollutants in the pump pool, rainwater pipe and groundwater were conductivity, total dissolved solids, total hardness, total alkalinity, chemical oxygen demand, chloride, sulfate, bicarbonate sodium, potassium, calcium and magnesium. The water quality of the stormwater pipe was slightly better than that of the pump pool and groundwater. The main pollutants detected in the sediment of the stormwater pipe were ammonia nitrogen and sulfur. The generation of methane, ammonia, and hydrogen sulfide under the low-oxygen environment in pump pool and stormwater pipe during carbon, nitrogen, and sulfur reduction was the major sources of odor from the external drainage water. Sulfur compounds in water samples of the pump pool and stormwater pipe could change into iron sulfide and manganese sulfide under the disturbance conditions, which was the major sources for the blackening of external drainage water. Sino-Singapore Tianjin Eco-city Qingtuozi Rainwater Pumping Station and stormwater pipe network odor disposal was expected to adopt aeration as the key process, combined with anti-seepage, dredging and other technologies. In addition, initial stormwater and rainfall runoff pollution is the main source of pollutants in the stormwater pumping station and stormwater pipe in Tianjin.