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Int J Environ Res Public Health

Title:		The Shock Effect of Inorganic Suspended Solids in Surface Runoff on Wastewater Treatment Plant Performance
Author(s):		He L; Tan T; Gao Z; Fan L;
Address:		"College of Resources and Environment, Zunyi Normal University, Zunyi 563006, China. helitougao@163.com. Chongqing Architectural Design Institute of China, Chongqing 400015, China. tantao13594037122@163.com. College of Resources and Environment, Zunyi Normal University, Zunyi 563006, China. wyhgzx@163.com. College of Resources and Environment, Zunyi Normal University, Zunyi 563006, China. fldxx@126.com"
Journal Title:		Int J Environ Res Public Health
Year:		2019
Volume:		20190204
Issue:		3
Page Number:		-
DOI:		10.3390/ijerph16030453
ISSN/ISBN:		1660-4601 (Electronic) 1661-7827 (Print) 1660-4601 (Linking)
Abstract:		"Previous studies on the water quality of surface runoff often focused on the chemical oxygen demand (COD), nitrogen, phosphorus, and total suspended solid (TSS), but little is known in terms of the inorganic suspended solids (ISS). This research investigated the effects of ISS carried by surface runoff on the treatment efficiency of the pretreatment facilities and the ratio of mixed liquor volatile suspended solid to mixed liquor suspended solid (MLVSS/MLSS) of the activated sludge in a wastewater treatment plant (WWTP) with the anaerobic-anoxic-oxic (AAO) process in Chongqing city, China. The results showed that the surface runoff had a long-lasting impact on the grit removal capacity of the grit chamber, affecting the normal operation after the rainfall. In contrast, the primary sedimentation tank showed strong impact resistance with higher removal rates of COD, TSS, and ISS. Nonetheless, the primary settling tank aggravates the removal of organic carbon in sewage during rainfall, having a negative impact on subsequent biological treatment. The ISS in the surface runoff could increase the sludge concentration and decrease the MLVSS/MLSS ratio. After repeated surface runoff impact, the MLVSS/MLSS ratio in the activated sludge would drop below even 0.3, interrupting the normal operation of WWTP"
Keywords:		"Carbon Compounds, Inorganic/*chemistry China Sewage/*chemistry Waste Disposal, Fluid/*methods Wastewater/*chemistry Water Pollutants/*chemistry Mlvss/mlss inorganic solids surface runoff wastewater treatment;"
Notes:		"MedlineHe, Li Tan, Tao Gao, Zhixi Fan, Leilei eng Research Support, Non-U.S. Gov't Switzerland 2019/02/06 Int J Environ Res Public Health. 2019 Feb 4; 16(3):453. doi: 10.3390/ijerph16030453"