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EFFICIENT CONTAMINANT REMOVAL FROM LIQUID DIGESTATE OF PIG MANURE BY CHEMICAL PRECIPITATION AND CO_(2) MINERALIZATION USING ALKALINE ASH

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Frontiers of Agricultural Science and Engineering 2023年第3期10卷 479-491页

作者： Zhengxin FEI Zijie DING Xuan ZHENG Liang FENG Qingyao HE Shuiping YAN Long JI College of Pharmaceutics Jinhua PolytechnicJinhua 321007China Technology&Equipment Center for Carbon Neutrality in Agriculture College of EngineeringHuazhong Agricultural UniversityWuhan 430070China

Chemical precipitation is a widely applied approach for a liquid fraction of digestate(LFD)of agricultural waste but its large-scale application requires low-cost and efficient precipitating agents and novel process *** study evaluated novel approach for the efficient removal of contaminants from the LFD using fly ash-based chemical precipitation,followed by filtration and CO_(2) *** technical feasibility of this approach was evaluated using pH and electrical conductivity(EC),and removal efficiencies of total phosphorus(TP),chemical oxygen demand(COD)and heavy metals during the *** fly ash used in this study showed a promising performance as a chemical precipitation agent for COD and TP removal from the treated LFD involving complex effects of precipitation and ***_(2) bubbling after fly ash-based chemical precipitation provided further COD and TP removal by carbonation reactions between CO_(2) and the excessive alkaline minerals in fly *** addition of fly ash to untreated LFD increased pH from 8.3 to 12.9 and EC from 7.01 to 13.7 mS·cm^(−1),CO_(2) bubbling helped neutralize the treated LFD and reduce the EC,and concentrations of toxic ions by carbonation *** fly ash-based chemical precipitation and CO_(2) mineralization had>93%COD and>98%TP removal efficiencies,and resulted in an EC of<2 mS·cm^(−1) and a neutral pH in the treated LFD,as well as the high purity calcite product.

关键词： anaerobic digestion chemical oxygen demand fly ash ion removal total phosphate

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