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SIM U LA T E D ST A R C H W A ST E W A T E R T R E A T M E N T B Y M U LT I-ST A G E A E R A T IO N SB R PR O C E SS
Liao Xin-kai, Li Qing-biao , Chen Wen-mou , Deng Xu , Lu Ying-hua , He Ning
(Department of Chemical and Biochemical Engineering, Xiamen University, Xiamen 361005 , China) A bst : A m ul i age aerat on SB R process w as desi ract t -st i gned t degrade si ul ed st o m at arch w ast at ew er. E ffect oft perat and t rat o ofanoxi t s em ure he i a o aeration aerobic time on the process were studied. It was found that starch wastewater could be efficiently treated at room temperature. The hydrolysis treatment in multi-stage SBR process could accelerate the hydrolysis of starch into small organic acid molecule and improve the feasibility of biochemical treatment of the starch wastewater, but the removal efficiency of COD which was mainly determined by the aerobic treatment was relatively low. The optimal ratio of hydrolytic/aerobic time depended on the properties of wastewater. For the treatment of wastewater containing 6.0g/L starch and 6690 mg/L COD, the combination of 4 h+8 h was optimal, through which the removal efficiency of COD could reach to 96.8 % and the COD concentration of outlet wastewater was only 215 mg/L after treatment for 24h. The combination of 6 h+12 h could be the most efficient to treat the wastewater containing 8.0 g/L starch concentration and 8920 mg/L COD. After treatment for 30h, the removal efficiency of COD was 94.4 % and the COD concentration in outlet wastewater dropped to 547 mg/L. K ey w ords:st arch w ast at ew er;bi ogi ol caldegradat on;SB R process i

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