2010•Environmental Science & TechnologyRequires access
Comparative Study on Potato Starch Wastewater Treatment Using Chemical Flocculants
Wang You-le, Bao-rong Zhang, Zhiming Fan
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Abstract
Seasonal production of potato starch wastewater makes difficult application of conventional biological treatment.The flocculants can be used to wastewater pretreatment to alleviate the burden of later treatment.Conventional chemical flocculants including AlCl3,Fe2(SO4)3,PAM and remixed between organic and inorganic ones were used to treat potato starch wastewater.Influence of dosage of flocculants,pH,dosage of coagulant aid CaCl2 and sedimentation time to flocculation efficiency was studied,and the optimum flocculation conditions were determined.Flocculants of AlCl3 +PAM which has a better treatment efficiency with COD removal rate of 41.08%,turbidity removal rate of 95.06% and chroma removal rate of 90.63% with lower dosage of flocculants and CaCl2 as well as lower cost of 11.05yuan per ton wastewater and sludge of 649g per ton wastewater was determined as the best flocculation treatment conditions according to comparison of treatment efficiency,cost and flocculation conditions.