摘要
我国剩余污泥厌氧转化率显著低于发达国家,泥质是影响污泥厌氧消化性能的重要因素,而我国剩余污泥泥质相比于发达国家的典型差异主要体现在3个方面,即污泥龄长、微细砂含量高和金属离子含量高.因此,系统性研究了泥龄、微细砂和金属离子对剩余污泥厌氧消化性能的影响,进行量化比较,并进行有针对性的强化研究.结果表明,微细砂对VS降解率的消极影响并不明显,而泥龄和金属离子是主要的抑制因素,泥龄的抑制程度显著高于金属离子(P<0.05),且随着泥龄的增加,金属离子的抑制作用呈进一步增强的趋势,因而总结得出长泥龄为限制我国污泥厌氧消化性能的最主要因素.经高温热水解预处理(160℃, 0.55 MPa, 30 min)后,长泥龄污泥的累积产甲烷量和VS降解率显著提升,接近于泥龄为5 d时的值,因此高温热水解具有突破长泥龄所致的污泥厌氧产甲烷瓶颈的潜力.
The anaerobic conversion efficiency of excess sludge in China is significantly lower than that in developed countries.Sludge characteristics are important influencing factors in the anaerobic degradability of sludge.The typical differences between excess sludge in China and in developed countries are mainly reflected in three aspects:long sludge age,high content of micro-sized grits,and high content of metal ions.Therefore,the effects of sludge age,micro-sized grits(represented by silica particles),and metal ions on the anaerobic digestion(AD)of excess sludge were studied systematically.Quantified comparison and targeted enhancement research were also carried out.The results showed that the negative effect of grit in the influent on VS reduction of sludge during AD was not obvious,while sludge age and metal ions were the main inhibitory factors.In addition,the inhibition level of sludge age was significantly higher than that of metal ions(P<0.05).With an increase in sludge age,the inhibition level of metal ions showed a further strengthening trend.Therefore,it could be concluded that long sludge age was the most important factor limiting the degradability of excess sludge.Moreover,with thermal hydrolysis pretreatment(160℃,0.55 MPa,30 min),the cumulative methane yield and VS reduction of sludge with long sludge age(40 d)almost increased to the values of sludge with a sludge age of 5 d.That is,thermal hydrolysis pretreatment has the potential to break through the bottleneck of degradability of sludge caused by long sludge age.
作者
董滨
高君
陈思思
杨殿海
戴晓虎
DONG Bin;GAO Jun;CHEN Si-si;YANG Dian-hai;DAI Xiao-hu(College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China)
出处
《环境科学》
EI
CAS
CSCD
北大核心
2020年第7期3384-3391,共8页
Environmental Science
基金
国家重点研发计划项目(2018YFC1900905)
国家水体污染控制与治理科技重大专项(2017ZX07403002)。
关键词
剩余污泥
微细砂
金属离子
泥龄
厌氧消化
热水解
excess sludge
grits
metal ions
sludge age
anaerobic digestion
thermal hydrolysis
