页岩对污泥氨气挥发的抑制作用

Effect of shale addition on ammonia volatilization from sewage sludge

氨气是城市污水污泥产生的恶臭气体之一,控制或抑制其产生是资源化利用甚至处置过程中至关重要的。通过改进氨气测量方法定量分析外掺页岩对污泥氨气挥发的抑制作用和机理,实验研究了页岩掺量、陈放形式以及环境温度对污泥氨气挥发浓度的影响。结果表明,外掺页岩对污泥氨气挥发具有明显的抑制作用,随温度升高、陈放时间延长抑制效果有所减弱但仍具有明显作用;页岩对污泥氨气挥发的抑制作用主要为对氨气的吸附作用。

Ammonia is one of the main foul-smelling gases produced from city sewage sludge. It is vital to control or restrain the ammonia emissions during the processes of use or disposal of sewage sludge. Effects and mechanisms of shale addition on ammonia volatilization from sludge were investigated by modifying the measurement method of ammonia. The factors affecting ammonia volatilization from sludge involving in shale amount,stack form and ambient temperature were estimated in this study. The results showed that shale addition could inhibit ammonia volatilization from sludge significantly. Moreover,the inhibition was observed to become weakened with temperature elevation as well as the extension of depositing time. In addition,the main mechanism that inhibition of ammonia volatilization from sludge is ammonia adsorption.