This paper mainly studies the process of treating and enriching nicotine from tobacco slice wastewater to solid sludge by Ca-Mg-Al combined coagulant,and the process of extracting nicotine from solid sludge.Through orthogonal experimental design and alkaline extraction,the nicotine in sludge extract was extracted by solvent,and the nicotine content in sludge was determined by HPLC.The type of extractant,the amount of ex-tractant and the number of extraction were investigated by single factor.PH is 10.0;the molar ratio of Ca(OH)2 MgSO4·7H2O,Al2(SO4)3·18H2O is 12∶3∶4,and the amount of combined coagulant is 5.0g/L.Under this condi-tion,the COD removal rate reaches 62％,and the enrichment rate of wastewater can reach 58.4％.Finally,the nic-otine content in the treated sludge was 1.05％,which had a certain extraction and recovery value.
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