摘要
为了优化BF废气处理系统设计，实验研究了填料湿度，pH值对BF系统处理H2S废气的影响，并考察了气流流速、相对湿度、温度等参数对生物填料层湿度变化的影响规律．实验结果表明，填料层的湿度变化会影响BF系统对H2S的去除率，当湿度小于45％时，BF系统对H2S去除率呈现下降态势．从BF系统长期稳定运行角度看，适宜的湿度范围是50％-70％．气流湿度、气速、温度等参数影响填料层的湿度变化，填料层湿度变化是气流特性和生物效应共同作用的结果．本实验条件下，填料层的最大干燥速率与相对湿度的对数值、气速的0．68次幂、温度的0．8次幂成正比．另外，当pH值大于8．0时，其对以短杆菌为优势菌的H2S氧化细菌活性的影响较大。
In order to optimize the design and operation of biofilters, effects of moisture content and pH on H2S removal in a biofiher have been studied in this paper. The experiment has reached following important results. The H2S removal efficiency in the biofiher decreased when the moisture content was below 45% and a proper moisture content ranging from 50% to 70% was essential to the biofilter for a long-term operation. The properties of the inlet gas such as gas velocity, relative humidity and temperature, interacted with the biological activities to change the moisture content in the biofiher, and under the conditions of this experiment, the maximum drying rate of packing was in proportion to the logarithm of relative humidity, 0.68 power of gas velocity and 0.8 power of temperature. Finally the effect of pH on the activity of H2S-oxided bacteria was obvious when the value of pH exceeded 8.0.
出处
《环境科学学报》
CAS
CSCD
北大核心
2006年第4期589-594,共6页
Acta Scientiae Circumstantiae
基金
浙江省重大科技攻关项目(No.2003C13004)~~
关键词
硫化氢
生物过滤
填料层湿度
hydrogen sulfide
biofiltration
moisture content
