二元共沉淀体系去除沼液有机物及机理分析  

Removal of Organic Matter from Biogas Slurry by Binary Co-precipitation System and Mechanism Analysis

作　　者：杨爱爱 陈建国[1,2] 王小丽 郭卉 张琦 YANG Aiai;CHEN Jianguo;WANG Xiaoli;GUO Hui;ZHANG Qi(College of Life Sciences and Technology,Central South University of Forestry Science and Technology,Changsha 410004;National Engineering Laboratory for Applied Technology of Forest&Ecology in South China,Changsha 410004)

机构地区：[1]中南林业科技大学生命科学与技术学院,长沙410004 [2]南方林业生态应用技术国家工程实验室,长沙410004

出　　处：《水土保持学报》2020年第1期380-384,共5页Journal of Soil and Water Conservation

基　　金：湖南省重点研发计划项目(农业支撑领域)(2015NK3025;)创新平台开放基金项目(16K105)

摘　　要：针对猪场沼液有机质含量高,其他处理工艺周期长、成本高、难去除的问题。采用包含氧化钙水溶液和AlCl3的二元共沉淀体系去除沼液有机污染物。探究了沉淀剂配比、投加量、反应时间、沼液初始pH等因素对有机物去除效果的影响。结果表明:当共沉淀剂体积比为1∶2.5、投加量为1∶1(体积比)、反应时间60 min、pH为9时有机质最大去除率达到93%。通过对反应前后沉淀物XRD、FITR和SEM分析,表明共沉淀剂可与沼液中带负电有机质通过电荷吸引以及与正价金属离子的络合作用絮凝沉淀有机物。沉淀反应迅速且去除有机质较为彻底,在养殖场废水处理中具有良好的工业应用前景。In consideration of high organic matter content in biogas slurry of pig farm, and long cycle, high cost, and difficult to remove of other treatment processing, a binary co-precipitation system comprising an aqueous calcium oxide solution and AlCl3was applied to remove organic pollutants of biogas slurry. The effects of precipitant ratio, dosage, reaction time, and initial pH of biogas slurry on the removal of organic matter were investigated. The results showed that the maximum removal rate of organic matter reached 93% when the co-precipitant volume ratio was 1∶2.5, the dosage was 1∶1(volume ratio), and the reaction time was 60 min at pH 9. The XRD, FITR, and SEM analysis of the precipitates before and after the reaction demonstrated that the co-precipitant could flocculate and precipitate organic matter by charge attraction with negatively charged organic matter, and complexation with normal valence metal ions in the biogas slurry. The precipitation reaction was rapid and could completely remove organic matter, and had good industrial application prospects in farm wastewater treatment.

关 键 词：沼液 有机质 共沉淀剂 反应机理 

分 类 号：X713[环境科学与工程—环境工程]