污泥干化过程氨的释放与控制  

Characterization of ammonia release during sewage sludge drying process and its control

作　　者：翁焕新[1] 章金骏[1] 刘瓉[1] 倪伟伟[1] 马学文[1] 

机构地区：[1]浙江大学环境与生物地球化学研究所,浙江杭州310012

出　　处：《中国环境科学》2011年第7期1171-1177,共7页China Environmental Science

基　　金：浙江省重大科技攻关和重点科技计划资助项目(2005C13051;2005C23005)

摘　　要：通过模拟试验,深入研究了污泥氨在自然状态和不同温度下的释放特征及其影响因素,并结合污泥低温干化工艺的特点,建立了污泥氨释放的收集与处理系统.结果表明,污泥在储存的四天时间内,氨在空气条件下自然释放的日平均释放量为0.11μg/(g.d),在污泥干化过程中,氨的主要释放量集中在0～30min的早期阶段,氨的释放与水的蒸发同步发生,干化温度决定了污泥氨的释放强度,控制污泥在低温下完成干化过程,是抑制污泥氨释放强度的有效措施.通过多级湿式除尘除气不但可以去除污泥干化时释放的绝大部分氨和其他有害气体(如硫化氢),而且几乎可以去除全部烟尘.Through simulation experiments,we studied the characteristics of the ammonia release from sludge drying process under varying temperatures,and sought for factors that dictate the process.We established a collection and treatment system for ammonia released from sludge ammonia,in combination with the low-temperature sludge drying process.Our study shows that during a four-day exposure to air,ammonia is released at a average rate of 0.11？g/（g？d）,with a burst release observed at the first 30 minutes of the exposure.Ammonia is released simultaneously with water evaporation,and its releasing strength is correlated with the drying temperature.Therefore,lowering temperature is effective to prevent ammonia release during sludge drying process.Furthermore,multistage wet dedusting is also effective to remove ammonia and other harmful gas（e.g.H2S） as well as dust during sludge drying process.

关 键 词：污泥干化 氨 释放与控制 

分 类 号：X703[环境科学与工程—环境工程]