摘要
研究生物量控制技术对于提高生物过滤法处理VOCs气体的长期运行性能具有重要意义．用4套平行的生物过滤塔处理甲苯气体，考察了NaOH溶液对生物过滤塔中菌体的去除效果及其对过滤塔去除甲苯性能的影响．NaOH循环洗脱的试验结果表明，在0．2％-0．8％的NaOH浓度范围内，适宜的循环洗脱持续时间为2—3h．在4个试验浓度下，浓度为0．4％的NaOH溶液对菌体的去除效果最佳，此时菌体洗脱以脱附作用为主．对不同化学洗脱方式进行综合比较发现，循环洗脱是较为适宜的化学洗脱方式．对过滤塔甲苯去除性能的监测表明，洗脱后过滤塔的去除性能可在3—4d内恢复，不同浓度NaOH对去除性能的影响差别不大．
Biomass control techniques are very important for biofilters treating volatile organic compounds （VOCs） to enhance their long-term operation performance. In this study, four paralleled biofilters were set up treating toluene gas, The chemical removal of excess hiomass and its impact on biofilter operation were investigated. The experimental results of circulating wash showed that the optimal washing time for hiomass removal was 2 - 3 hours by NaOH ranging from 0.2% to 0.8% . Among the four experimental concentrations, the NaOH solution of 0.4% was more effective to remove the hiomass from the hiofiher and biomass shearing was the main process of the hiomass removal under this circumstance, According to the comparison results of three washing mode, circulating washing was found to he the most suitable mode for hiomass removal, The monitoring results of the toluene removal performance demonstrated that the impacts of NaOH solutions with different concentrations had little difference and the toluene removal capacities could be recovered after 3 - 4 days,
出处
《环境科学》
EI
CAS
CSCD
北大核心
2007年第2期300-303,共4页
Environmental Science
基金
国家高技术研究发展计划(863)项目(2004AA601061)
关键词
生物过滤
挥发性有机物
生物量控制
化学洗脱
biofiltration
volatile organic compounds （VOCs）
biomass control
chemical removal
