铵氮对ASBR装置厌氧污泥产甲烷活性的影响  

Effect of Ammonium Nitrogen on Methane Producing Activity of Anaerobic Sludge in ASBR System

作　　者：陈锷 顾向阳[2] 李媛 李世超 包新荣 CHEN E;GU Xiang-yang;LI Yuan;LI Shi-chao;BAO Xin-rong(Gansu Environmental Monitoring Center, Lanzhou 730020,China;Ministry of Agriculture Key Laboratory of Microbiological Engineering Agricultural Environment, Nanjing Agricultural University, Nanjing 210095,China)

机构地区：[1]甘肃省环境监测中心站,兰州730020 [2]南京农业大学农业部环境微生物工程重点开放实验室,南京210095

出　　处：《中国沼气》2020年第5期31-34,共4页China Biogas

基　　金：甘肃省青年科技基金计划(18JR3RA023)。

摘　　要：为研究铵氮对处理餐厨垃圾的厌氧污泥产甲烷活性的影响,文章设计了甲烷转化率和日均甲烷产量与进水铵氮(NH+4-N)浓度负荷的对应关系两种判断方法,用于确定铵氮(NH+4-N)对厌氧污泥产甲烷活性的毒性负荷。结果表明:中温条件下(30℃~35℃),以模拟餐厨垃圾组分的混合短链脂肪酸为厌氧序批间隙式反应器(Anaerobic sequencing batch reactor,以下简称ASBR)的进水基质,测定铵氮(NH+4-N)对厌氧污泥产甲烷活性的毒性负荷,发现厌氧污泥对铵氮(NH+4-N)有一定的耐受能力;在进水铵氮(NH+4-N)浓度≤1 g·L^-1时,对厌氧污泥的产甲烷活性无显著影响,但当进水铵氮(NH+4-N)浓度在1.5~7.5 g·L^-1d-1之间时,厌氧污泥产甲烷活性毒性负荷两种判定方式,即厌氧污泥中的甲烷日均产量和甲烷转化率均与铵氮浓度呈现明显负相关关系,由此可得,使厌氧污泥活性下降10%和50%的铵氮(NH+4-N)浓度分别为1.61 g·L^-1,1.88 g·L^-1和6.82 g·L^-1,6.69 g·L^-1。实验说明适当的铵氮(NH+4-N)可以提升ASBR中厌氧污泥的产甲烷活性,但过高的铵氮(NH+4-N)浓度则会抑制产甲烷活性。In order to study the effect of NH+4-N on methanogenic activity of anaerobic sludge for treating kitchen waste,in this paper,two methods were designed to determine the corresponding relationship between methane conversion rate,or average daily methane production and influent NH+4-N loading,and so determine the toxic loadings of NH+4-N on methanogenic activity.The results showed that under temperature of 30℃~35℃,with the mixed short-chain fatty acids of simulated kitchen waste as influent substrate for the anaerobic sequencing batch reactor(ASBR),it was found that anaerobic sludge had a certain tolerance to ammonium nitrogen(NH+4-N).When the concentration of NH+4-N in the influent≤1 g·L^-1,there was no significant influence on the methanogenic activity for anaerobic sludge.However,when the concentration of NH+4-N in the influent was 1.5~7.5g·L^-1d-1,the average daily methane yield and methane conversion rate of anaerobic sludge were negatively correlated with ammonium nitrogen concentration.When the anaerobic sludge activity was reduced by 10%and 50%,the NH+4-N concentration,were about 1.61 g·L^-1,1.88 g·L^-1,and 6.82 g·L^-1,6.69 g·L^-1,respectively.The experiment showed that appropriate NH+4-N concentration could enhance the methanogenic activity of anaerobic sludge in ASBR,but too high NH+4-N concentration could inhibit the methanogenic activity.

关 键 词：餐厨垃圾 厌氧序批间歇式反应器 铵氮(NH+4-N) 产甲烷活性 

分 类 号：S216.4[农业科学—农业机械化工程] X703[农业科学—农业工程]