现有的PTA废水处理工艺主要采用厌氧好氧结合的生物处理工艺,好氧系统由于受进水水质和水量波动的影响,系统运行仍缺少稳定性,很难保持稳定的出水水质和排放达标。另外现有好氧工艺处理的容积负荷小,水力停留时间过长,对难降解的有机物去除能力不强。膜-生物反应器用膜组件代替传统工艺中的二沉池,可以进行高效的固液分离,克服了传统好氧工艺中出水水质不够稳定、污泥容易膨胀的不足,具有很大的优越性。 The existing PTA wastewater treatment process mainly uses anaerobic and aerobic biological treatment process. Due to the influence of influent water quality and water fluctuation, the aerobic system still lacks stability in operation and it is difficult to maintain stable effluent quality and discharge standards . In addition the existing aerobic process capacity of the small volume load, hydraulic retention time is too long, difficult to remove organic matter removal capacity is not strong. Membrane - bioreactor membrane module instead of the traditional process of the second settling tank, can be highly efficient solid-liquid separation, to overcome the traditional aerobic process effluent quality is not stable enough, sludge is easy to expand, has great advantages.