塔式喷淋与活性焦组合工艺在污泥好氧发酵废气领域的应用研究

Research on Application of Tower Spray Combined with Activated Coke in Treatment of Waste Gas from Aerobic Fermentation of Sludge

污泥好氧发酵产生的废气具有成分复杂、臭气浓度高等特点,难以被传统的生物除臭法所去除,除臭问题成为制约污泥好氧发酵的瓶颈问题。郑州某污泥处理厂采用化学吸收、火山岩除湿和活性焦吸附等组合新技术解决这一难题。结果表明:化学吸收法可以将空间和堆体氨气浓度降低至15mg/m^(3)和20mg/m^(3)以下,去除率高达85%,喷淋方式可以将堆体气体温度从62℃降低至40℃,臭气浓度在此阶段也得到了大幅度减少。经过火山岩除湿系统,可以将气体相对湿度从80%降低至50%左右,可延长活性焦的使用寿命。而活性焦吸附则主要去除好氧发酵气体废气中的非极性气体,将臭气浓度控制在1000以下,使气体稳定达标排放。

The waste gas produced by aerobic fermentation of sludge is featured by complex composition and high odor concentration,which is difficult to be removed by the traditional biological deodorization method.Deodorization has become a bottleneck restricting the aerobic fermentation of sludge.A sludge disposal plant in Zhengzhou uses a combination of new technologies such as chemical absorption,volcanic rock dehumidification,and activated coke adsorption to solve this bottleneck problem.The results show that the ammonia concentration in the space and the stack can be reduced to a level below 15mg/m^(3) and 20mg/m^(3) with the chemical absorption method.The removal rate is as high as 85%,the stack gas temperature can be reduced from 62℃to 40℃with the spray method,and the odor concentration has also been reduced greatly at this stage.With the volcanic rock dehumidification system,the relative humidity of the gas can be reduced from 80%to about 50%,which can extend the service life of activated coke.The activated coke adsorption is mainly adopted to remove the non-polar gas in the tail gas of the aerobic fermentation gas exhaust,and control the odor concentration below 1000 mg/m^(3),so that the gas can be discharged stably.