Treatment of Papermaking Wastewater with Inorganic Compound Coagulant
SUI Zhi-hui (School of Light Industry and Textile, Qiqihar University, Qiqihar Heilongjiang Province,161006)
A new type of effective complex coagulant polysilicate aluminum ferric salt(PSAF) was prepared from coal gangue and pyrite slag and used as coagulant in the treatment of papermaking wastewater. The experimental results showed that PSAF had a good coagulation effect in the treatment of papermaking wastewater in a wide range of pH value. The removal rate of SS, COD_~Cr and chromaticity was 96.5%, 88.6% and 92.3% respectively in the condition where temperature was normal, pH value was 7.0 and dosage of the coagulant was 50mg/L. The temperature had little impact on the removal rate of COD_~Cr . In comparison with the conventional coagulants, such as Al_2(SO_4)_3 and FeCl_3, the coagulation performance of PSAF was the best. The remarkable characteristics of this method were higher settlement rate and lower cost of treatment. The coagulation mechanism of PSAF coagulant in the treatment of papermaking wastewater was also discussed.
【CateGory Index】： X793