生物沥浸处理提高城市污泥脱水性能的中试研究:连续运行模式  

Improvement of Municipal Sewage Sludge Dewaterability by Bioleaching:A Pilot-Scale Study with a Continuous Plug Flow Reaction Model

作　　者：刘奋武[1] 周立祥[1] 周俊[1] 姜峰[1] 

机构地区：[1]南京农业大学资源与环境科学学院环境工程系,南京210095

出　　处：《环境科学》2011年第10期2993-2998,共6页Environmental Science

基　　金：国家高技术研究发展计划(863)项目(2009AA06Z317);国家自然科学基金项目(20977048)

摘　　要：采用有效容积为700 L的推流式生物沥浸反应器对城市污泥进行连续10 d的生物沥浸处理,采用折流方式将反应器从进泥端到处理结束后的排泥端,沿程方向依次划分为1～6区.对试验过程中各区的pH变化趋势,各区污泥的脱水性能(用污泥比阻SRF表征)及生物沥浸污泥经厢式压滤脱水泥饼含水率及其水分蒸发速度进行了系统的研究.结果表明,当反应器曝气量为1.2 m3.h-1,HRT为2.5 d,微生物营养剂加入量为4 g.L-1时,该反应器能够较好地完成污泥生物沥浸过程.沥浸体系在第6 d达到稳定时,污泥的比阻值可由原来的1.50×1013m.kg-1最低降低至0.34×1013m.kg-1.生物沥浸后的污泥经过增强聚丙烯厢式压滤机脱水后,在0.3 MPa压力条件下压滤4 h(进泥2 h,压榨2 h)、3 h(进泥1.5 h,压榨1.5 h)、2 h(进泥1h,压榨1 h)与1 h(进泥0.5 h,压榨0.5 h),脱水泥饼的含水率分别为57.9%、59.2%、59.6%与63.4%.不同压滤时间的泥饼在25℃条件下放置15 h,泥饼的含水率均下降至45%左右,放置96 h后,含水率进一步降低至10%以下.此研究将为城市污泥生物沥浸后期工程化及脱水污泥能源化应用提供必要的参数支持.A plug-flow bio-reactor of 700 L working volume for sludge bioleaching was used in this study.The reactor was operationally divided into six sections along the direction of the sludge movement.Ten duration of continuous operation of sludge bioleaching with Acidibacillus spp.and 1.2 m3·h-1 aeration amount was conducted.In this system,sludge retention time was 2.5 d,and the added amount of microbial nutritional substance was 4 g·L-1.During sludge bioleaching,the dynamic changes of pH,dewaterability（specific resistance to filtration,SRF）of sewage sludge in different sections,the moisture content and moisture evaporation rate of dewatered bioleached sludge cake obtained by chamber filter press were investigated.The results showed that the SRF of sludge significantly decreased from initial 1.50×1013 m·kg-1 to the final 0.34×1013 m·kg-1.The wasted bioleached sludge was collected and dewatered by chamber filter press under the following pressures as 0.3 MPa for 4 h（2 h for feeding sludge,2 h for holding pressure）,3 h（1.5 h for feeding sludge,1.5 h for holding pressure）,2 h（1 h for feeding sludge,1 h for holding pressure）,and 1 h（0.5 h for feeding sludge,0.5 h for holding pressure）.Correspondingly,the moisture of dewatered sludge was reduced to 57.9%,59.2%,59.6%,and 63.4% of initial moisture,respectively.Moreover,the moisture content of bioleached sludge cake was reduced to about 45% and less than 10% if the cake was placed at 25℃ for 15 h and 96 h,respectively.Obviously,sludge bioleaching followed by sludge dewatering using chamber filter press is a promising attractive approach for sludge half-dryness treatment in engineering application.

关 键 词：城市污泥 生物沥浸 推流式反应器 中试 脱水 

分 类 号：X705[环境科学与工程—环境工程]