Ce^3＋对厌氧颗粒污泥产VFA的影响  

Effect of Ce^(3+) on Volatile Fatty Acid Concentrations During Anaerobic Granular Sludge Digestion

作　　者：梁睿[1] 夏青[1] 丁丽丽[1] 时孝磊[1] 赵明宇 任洪强[1] 

机构地区：[1]南京大学环境学院污染控制与资源化研究国家重点实验室,南京210093 [2]雍义康科技(北京)有限公司,北京100102

出　　处：《环境科学》2009年第4期1115-1119,共5页Environmental Science

基　　金：教育部科学技术研究重点项目(108150);水处理与水环境修复教育部工程中心开放项目(WTWER0721)

摘　　要：采用批式实验,以葡萄糖和乙酸钠为基质,研究投加不同浓度稀土Ce3+对稳定驯化和长期贮存的厌氧颗粒污泥消化产VFA的影响.结果表明,Ce3+浓度<1 mg/L时可降低消化过程中的VFA浓度,促进丁酸向乙酸的转化以及乙酸转化为甲烷;Ce3+浓度为1~10 mg/L时则抑制细菌活性,不利于乙酸和丁酸的降解.稀土Ce的投加对以葡萄糖为基质的厌氧颗粒污泥消化产VFA中各组分的质量分数影响较小,厌氧消化前期和中期VFA产物主要为丁酸和乙酸,两者含量之和约为96%,丙酸含量<3%.以乙酸钠为唯一基质厌氧消化时,0.05 mg/L Ce3+的投加对乙酸钠降解具有一定促进作用,可提高反应速率和去除率.污泥经过长期贮存活性降低,但含稀土Ce的厌氧颗粒污泥活性高于不含稀土的污泥,利用含稀土Ce的污泥有利于反应器再启动.Batch experiments were conducted to investigate the effect of Ce^3＋ on volatile fatty acid（VFA） concentrations by anaerobic granular sludge digestion using D-Glucose and acetic sodium as substrate in the state of stabilization and restart-up. Results show that when the concentration of Ce^3＋ is lower than 1 mg/L, VFA concentration decreases, which suggests the transformation of butyric acid to acetic acid and acetic acid to methane is promoted. When the concentration of Ce^3＋ is 1-10 mg/L, the bacterial activity decreases and decomposition of the acetic acid and butyric acid becomes more difficult compared with the control. Adding Ce^3＋ brings little change in the constitution of VFA： 96 % of VFA is acetic acid and butyric acid, while the propionic acid accounts for less than 3 %. With the acetic sodium as the sole carbon and energy source, adding 0.05 mg/L Ce^3＋ could accelerate acetate degradation. After being conserved for 4 months, the activity of the Cecontaining anaerobic granular sludge is higher than that of the Ce-free sludge. The present of Ce contributes to the restart-up of anaerobic reactors.

关 键 词：挥发性脂肪酸(VFA) 稀土元素 CE^3+ 厌氧颗粒污泥 

分 类 号：X703.1[环境科学与工程—环境工程]