不同粒径零价铁（ZVI）对污水污泥H_2S和CH_4释放速率的影响

考察了不同粒径零价铁（ZVI）,包括200目普通铁粉（200m-ZVI）、800目超细铁粉（800m-ZVI）和纳米铁粉（nZVI,粒径=20 nm）,对污水污泥的硫化氢和甲烷释放速率的影响。研究发现：（1）在22 d内,添加0.1%的200m-ZVI使污泥的硫化氢释放速率提高48.0%,而添加0.1%的800-ZVI和nZVI,则使污泥的硫化氢释放速率分别降低33.1%和77.1%;（2）不同粒径ZVI均可以提高污泥沼气中的甲烷浓度,且依次为nZVI〉800m-ZVI〉200m-ZVI;（3）在23 d内,添加0.1%的200m-ZVI和nZVI使污泥的甲烷累计产生量分别提高了15.5%和40.6%,而添加0.1%800m-ZVI则使甲烷产生量降低了12.5%。nZVI可以有效控制污泥的硫化氢释放,并显著提升污泥在厌氧发酵过程的产甲烷速率。

Effect of different particle sizes of zero-valent iron（ZVI） on H_2S and CH_4 emission in sewage sludge

Effects of different particle sizes of zero-valent iron（ZVI）,i.e.200mesh-iron（200m-ZVI）,800mesh-superfine iron（800m-ZVI） and nanoscale iron（nZVI,d=20 nm）,on the H2S and CH4 emission in sewage sludge were investigated.The result shows that in the presence of 0.1% 200m-ZVI,the H2S average emission rate increased by 48%.However it decreased by 33.1% and 77.1% in the presence of 0.1% 800m-ZVI and nZVI in sewage sludge respectively in the experiment of 22 days duration.Methane concentrations in biogas increased in the presence of different particle sizes of ZVI in the order of nZVI800m-ZVI200m-ZVI.It increased by 15.5% and 40.6% in the presence of 0.1% 200 m-ZVI and nZVI respectively.The methane volume of production decreased by 12.5% in the presence of 0.1% 800m-ZVI during the 23 days anaerobic digestion.nZVI can reduce H2S release in sewage sludge effectively,and has the ability to boost methane production during anaerobic digestion dramatically.