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《Research of Environmental Sciences》 2016-02
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Suspension Properties of Fine Grit with Different Particle Sizes in Bioreactors

JI Fangying;FAN Jianping;WANG Ying;XU Xiaoyi;XU Xuan;LI Dongping;SUN Guosheng;Key Laboratory of Three Gorges Reservoir Region's Eco-Environment,Ministry of Education,Chongqing University;National Center for International Research of Low-Carbon and Green Buildings,Chongqing University;Guangdong Yue Gang Water Supply Co. Ltd.;  
Grit particle size affects whether grit is deposited at the bottom of bioreactors or suspended in activated sludge. Fine grit with a particle size of ≤73 μm is easily suspended in activated sludge and directly results in a decrease in the ratio of mixed liquor volatile suspended solids( ρ( MLVSS)) to mixed liquor suspended solids( ρ( MLSS)). With fine grit of ≤73 μm as the research object,this paper investigated the effect of fine grit with different particle sizes on the ρ( MLVSS) /ρ( MLSS) of activated sludge,discussed the suspensibility and suspension modes of fine grit,and further revealed the influence of fine grit on the activity of activated sludge,in order to provide a theoretical basis for the operation and management of wastewater treatment plants( WWTPs). Microscopic observations showed that fine grit with a particle size of 33 μm was freely suspended in activated sludge. Fine grit of ≤33 μm was picked up and bound by activated sludge flocs. A smaller particle size corresponded to a larger suspension ratio,which defined the proportion of fine grit brought in by influent that was suspended in the activated sludge,and a smaller ρ( MLVSS) /ρ( MLSS) of activated sludge. The suspension ratio was linearly related to the particle size of fine grit( y = 0. 996-0. 010x). The ρ( MLVSS) /ρ( MLSS) of activated sludge and the suspension ratio were significantly correlated( y = 2. 84 /( 12. 27 x + 3. 06)). The present study further revealed that fine grit is an inert substance and has no influence on microorganism activity. WWTPs can adjust ρ( MLSS) based on ρ( MLVSS) /ρ( MLSS) to ensure the stability of ρ( MLVSS),which is conducive to the stable operation of WWTPs.
【Fund】: 国家水体污染控制与治理科技重大专项(2013ZX07314-001-002);; 高等学校学科创新引智计划资助项目(B13041)
【CateGory Index】: X703
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