垃圾渗滤液污染羽中的最终电子受体作用研究

通过土柱模拟实验研究了最终电子受体和TOC在垃圾渗滤液污染羽各氧化还原带中的变化规律,并建立了相应的模型.结果表明,各种还原产物出现峰值的时间和相应的最终电子受体利用最终电子的能力有一定的关系,利用电子能力强的最终电子受体其还原产物出现急剧升高的时间较早,如NO-2出现峰值的时间比Fe2 早;TOC的浓度在产甲烷带、硫酸盐还原带、铁还原带、硝酸盐还原带和氧还原带中不断增加,增加速率分别为8.27、8.56、8.85、9.06和9.11 mg/(L·h).不同种类的微生物降解污染物的速度受最终电子受体的多少和有效性的限制,其反应速度和最终电子受体利用最终电子的能力大小相一致,也就是说,利用最终电子能力越强的最终电子受体越容易被微生物利用、消耗,对污染的反应也就越灵敏.

Terminal Electron Acceptor Process in Landfill Leachate Pollution Plume

A soil column filled with sandy soil was constructed to investigate changes of terminal electron acceptors (TEA) and TOC in redox zones of landfill leachate pollution plume, and their models were established, respectively. Results indicated that the time of peak-concentration appearance of different reducing products was related to the ability of terminal electron acceptors to compete for terminal electrons. The most competitive ones showed sharp concentration increased earlier. For example, the peak concentration of NO2(-) appeared earlier than that of Fe2+. The concentration of TOC increased in methanogenic zone, iron reduction zone, nitrate reduction zone and oxygen reduction zone, and its rate was 8.27, 8.56, 8.85, 9.06 and 9.11 mg/(L h), respectively. Degradation rate of contaminants by different microbes mainly depended on the amount and availability of terminal electron acceptors. The reaction rate was related to ability of terminal electron acceptors to compete for terminal electron, that is the stronger the ability of terminal electron acceptors to compete for terminal electrons, the easier could be used and consumed by microorganisms and the more sensitive to reflect on environmental pollution.