重力沉淀对猪场污水的分离效果及其对沼气发酵的影响  

Effects of gravitational sedimentation on separation of swine wastewater and biogas fermentation

作　　者：李洋[1,2] 邓良伟[2] 信欣[1] 陈闯[1,2] 郑丹[2] 魏本平[2] 

机构地区：[1]成都信息工程学院资源环境学院,成都610225 [2]农业部沼气科学研究所,成都610041

出　　处：《环境科学学报》2013年第7期1912-1917,共6页Acta Scientiae Circumstantiae

基　　金：国家生猪技术产业体系项目(No.CARS-36-10B)~~

摘　　要：采用重力沉淀法对猪场污水进行浓稀分离,并对分离得到的稀污水和浓污水进行沼气发酵实验,以考察沉淀分离对猪场污水沼气发酵的影响.结果表明,分离得到的稀污水体积占原污水的71.5%,相对于原污水,体积减少了28.5%,而COD、BOD5、SS、TN、TP浓度却分别减少了59.3%、64.4%、85.8%、36.7%和70.9%.分离得到浓污水体积占原污水体积的28.5%,却回收了70%以上COD与BOD5、95%以上的SS、65%的TN和85%的TP.绝大部分产沼气的底物都被分离到浓污水中,浓污水沼气产量占总产气量的85.5%.沉淀分离可以提高沼气发酵效率,在相同的发酵温度、COD负荷下,浓污水平均池容产气率为1.68L·L-1·d-1,比原污水和稀污水分别高25.3%、145%.通过重力沉淀,可以获得更好的升温效果,提高沼气发酵效率,沼渣沼液利用及污水达标处理也更加容易.To investigate the effect of sedimentation separation on biogas fermentation using swine wastewater, gravitational sedimentation was employed in this study to separate raw swine wastewater into low-content and concentrated liquids. The liquids were further used to produce biogas. The results showed that, in comparison with the raw wastewater, volume of the separated low-content liquid accounted for 71.5% of the raw wastewater, corresponding to 28.5% decrease. However, concentrations of COD, BOD5 , TN and TP of the low-content liquid decreased by 59.3% , 64.4%, 85.8% , 36.7% and 70.9% , respectively. On the other hand, the volume of the concentrated liquid, which accounted for 28.5% of the raw wastewater, contained more than 70% of COD and BOD5 , more than 95% of SS, 65% of TN and 85% of TP. Most of the substrates for biogas generation stayed in the concentrated liquid after the separation, and this liquid contributed to 85. 5% of total biogas yield. The efficiency of biogas fermentation also increased through the sedimentation separation. The average volumetric biogas production rate of the concentrated liquid was 1.68 L·L^-1.d^-1, which was 25.3% and 145% higher than those of the raw wastewater and the low-content liquid. In conclusion, gravitational sedimentation was able to improve the heating, get access to higher efficiency of biogas fermentation and simplify the treatment of the digestate and swine wastewater.

关 键 词：猪场污水 重力沉淀 沼气发酵 

分 类 号：X703[环境科学与工程—环境工程]