外加电势强化厌氧氨氧化工艺处理垃圾焚烧渗沥液短程硝化出水

Enhanced biotreatment of partial nitrified incineration leachate by applying electric potential in anammox system

利用外加电势强化厌氧氨氧化处理垃圾焚烧渗沥液短程硝化出水,研究外加电势对系统脱氮及有机物去除的影响。结果表明,在外加电势为0.06 V时,TN的去除率由43.2%提升至71.3%,COD的去除率由12.1%提升至24.4%。渗沥液中分子质量大于20 kDa的有机物在外加电势的作用下被部分降解成分子质量相对较小的有机物。外加电势也会刺激微生物产生更多的EPS且能提高其中PN/PS的比值,这有利于厌氧氨氧化菌在电极表面的生长和富集,增强微生物的活性。电极生物膜中细胞色素c(Cyt-c)、亚硝酸盐还原酶(Nir)、肼合成酶(HZS)和肼脱氢酶(HDH)4种厌氧氨氧化菌的功能酶的活性也在外加电势的作用下得到了提升。

The electric potential(EP)was applied in anammox system to enhance its biotreatment of partial nitrified leachate from municipal solid waste(MSW)plant.The effects of applied EP on total nitrogen(TN)and organic matter removal were investigated.The results showed that at 0.06 V electric potential applied in the anammox system,TN removal and COD efficiencies increased from 43.2%to 71.3%and 12.1%to 24.4%,respectively.Under the effect of applied EP,the macromolecules with molecular weight>20 kDa in the leachate were degraded into low molecular weighted organics.EP applied could stimulate the microbes,promote the extracellular polymeric substances(EPS)production,and improve the protein(PN)/polysaccharide(PS)ratio,which was conducive to anammox bacteria growth and enrichment on the electrode surface and microbial activity enhancement.Moreover,EP application also strengthened functional enzyme activity of anammox bacteria,such as the Cyt-c in electrode biofilm,Nir,HZS and HDH,and accelerated the rate of electron transfer.