Anaerobic biodegradation of methyl-group organics on industrial wastewater treatment

从城市污水处理厂活性污泥池中分离出两种能将四甲基氢氧化铵(TMAH)和异丙醇(IPA)分解为甲烷的厌氧微生物。根据对TMAH生物降解途径的化学分析，一个单元的甲基从TMAH依次解离，最终形成氨，同时从甲基(甲醇)中产生甲烷气。对于异丙醇胺的降解，检测到了丙酮、乙酸酯和氢气的中间体。甲烷的产生被认为是由乙酰裂解产甲烷菌和产氢产甲烷菌所致。根据实验得到的动力学数据，应用国际水协会课题组提出的活性污泥模型概念，绘制了工艺流程图，建立了数学模型。该模型结构有望为污水处理工艺的设计提供平台。

Two kinds of anaerobic microorganisms decomposing Tetra-methyl-ammonium hydroxid (TMAH) and isopropyl alcohol (IPA) to methane were enriched from the digestate of activated sludge at a municipal wastewater treatment plant. According to the chemical analysis of the biodegradation pathway for TMAH, one unit of methyl-group was sequentially uncoupled from TMAH and ammonium was eventually formed whilst producing methane gas from the methyl-group (methanol). For the degradation of IPA, intermediates of acetone, acetate and hydrogen were detected. The production of methane was thought to be attributed to the acetoclastic methanogens and hydrogenotrophic methanogens. Based on the kinetics obtained from the experiment, process maps were build and mathematical models were elaborated applying a concept of Activated Sludge Models developed by the task groups of International Water Association. The model structure was expected to use for a platform to design the wastewater treatment processes.