城镇污水处理厂污泥处理处置工艺生命周期评价

Life Cycle Assessment of Sewage Sludge Treatment or Disposal Technologies

以实际工程为例对目前国内主流的三种污泥处理处置工艺(好氧发酵、填埋、焚烧)进行了基于生命周期的系统评价,分别从致癌风险、温室效应、土地占用和能耗四个方面,横向比较了三种工艺的环境负荷。结果显示,好氧发酵工艺在致癌风险、温室效应和能耗方面均表现出较低负荷值,而焚烧则在运行能耗、致癌风险上负荷较高,填埋的主要问题集中在土地占用和温室效应两方面。

Three typical sewage sludge treatment and disposal technologies including aerobic com- post, landfill and incineration were assessed based on life cycle. Environmental loads （Pt） of the three technologies were calculated and compared in terms of carcinogenic risk, greenhouse effect, land occu- pancy rate and energy consumption. The results indicated that aerobic compost had a lower Pt amount in carcinogenic risk, greenhouse effect and energy consumption than landfill and incineration. However, in- cineration had a disadvantage in carcinogenic risk and energy consumption. Similarly, the main problems of landfill focused on land occupancy rate and greenhouse effect.