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去除城市生活污泥中有机络合态金属强化其厌氧生物制气
摘要点击 365  全文点击 98  投稿时间:2017-06-07  修订日期:2017-07-19
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中文关键词  城市生活污水污泥  有机络合态金属  厌氧消化  甲烷产量  表观活化能
英文关键词  sewage sludge  organic-bonding metals  anaerobic digestion  methane production  apparent activation energy
作者单位E-mail
卢怡清 同济大学环境科学与工程学院,污染控制与资源化研究国家重点实验室, 上海 200092 luyq1618@163.com 
许颖 同济大学环境科学与工程学院,污染控制与资源化研究国家重点实验室, 上海 200092  
董滨 同济大学环境科学与工程学院,污染控制与资源化研究国家重点实验室, 上海 200092 tj_dongbin@vip.163.com 
戴晓虎 同济大学环境科学与工程学院,污染控制与资源化研究国家重点实验室, 上海 200092  
中文摘要
      为提高城市生活污泥厌氧消化沼气产率,本文考察了通过金属络合剂EDTA预处理污泥,以去除城市生活污泥中有机络合态金属,强化其厌氧生物制气的效果.结果表明,经EDTA预处理去除金属后的污泥(实验组)较未预处理的污泥(对照组)的有机络合态金属含量减少[(5.09±0.57)%~(1.37±0.20)%,以TS计],溶解性有机质显著提高(SCOD提升627%),暗示该预处理方法能够极大地去除有机络合态金属并强化污泥有机质的溶出.通过测定污泥有机质溶出表观活化能发现,实验组污泥有机质溶出表观活化能比对照组降低36%,表明预处理能够有效降低有机质溶出反应的能量壁垒.污泥厌氧发酵研究发现,在16d的污泥厌氧产酸实验中,实验组VFAs浓度高于对照组,较对照组最大提升42%;在22 d的污泥厌氧产甲烷测试实验(BMP)中,实验组单位有机质累积甲烷产量比对照组增加48%,表明EDTA预处理对提高污泥厌氧消化产沼气具有重要的作用.通过进一步产沼气动力学研究发现,实验组的产沼气限速步骤在产甲烷阶段,而对照组限制于水解阶段,表明经EDTA预处理能有效地破除城市生活污泥厌氧消化过程的水解限速.
英文摘要
      To improve anaerobic digestion biogas yield, the removal of organic-bonding metals by EDTA pretreatment was investigated to strengthen the anaerobic biogas effect. The results showed that after EDTA pretreatment (experimental group), the organic-bonding metals were reduced from (5.09±0.57)% to (1.37±0.20)% (calculated with TS) and dissolved organic matter increased significantly (SCOD improved 627%), suggesting that this method could remove a large amount of organic-bonding metals and enhance the dissolution of organic sludge. According to the results for the apparent activation energy (AAE) of sludge organic matter dissolution, the AAE of the experiment group was 36% lower than the control group, showing that pretreatment could effectively reduce the reaction energy barrier for organic matter dissolution. In a test of anaerobic acid production lasting 16 days, the VFAs of the experiment group were higher than the control group, with the largest upgrade of 42%. In the anaerobic methane production test (BMP) that lasted for 22 days, compared with control group, the accumulated biogas production of the experiment group increased by 48%. Through further research on the dynamics of methane production, the rate-limiting step in the experiment group was methanogenesis, while that of the control group was hydrolysis, indicating that removal of organic-bonding metals by EDTA pretreatment could effectively accelerate the hydrolysis rate.

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