摘要
以不同来源污水处理过程产生的污泥为研究对象,考察了水热预处理对污泥粘度、氨氮质量浓度、pH值、TS(总固体)组分含量及厌氧消化性能的影响,并评估了不同污泥的水热改性效果及其中试条件下厌氧消化增益情况。研究结果表明,同等水热温度处理下,污泥粘度、氨氮质量浓度、pH值受污泥来源的影响较大。水热预处理对不同污泥都具有良好的改性效果,水热温度达到170℃后,污泥性质基本不变。各种污泥挥发性固体(VS)产气率随有机负荷的提高无显著性变化,但运行情况存在差异。不同污泥在水热预处理后厌氧消化产气性能均明显提升,VS产气率增加比例差异较大,北京、上海、山东三地污泥VS产气率增加25.2%~69.8%,由于广西污泥为纯剩余污泥,水热处理后VS产气率增加高达101.6%~133.8%。VS产气率的增加量相差不大,且随自身产气性能改变的波动较小,增加量为83~218 m^3/t(平均143 m^3/t)。水热预处理后污泥流动性能提高,可实现厌氧消化的高浓度、高负荷进料,反应器减容率可达38%~71%。
Sludge was an important by-product of sewage treatment.With the continuous expansion of number and scale of sewage treatment plants,the amount of sludge generated was increased.In the process of sludge stabilization,harmless and resource treatment,hydrothermal pretreatment and anaerobic digestion technology were widely used.In order to compare and analyze the effects of hydrothermal treatment on sludge properties and anaerobic digestion performance of different sources,the viscosity,ammonia nitrogen,pH value,TS components and anaerobic digestion performance of sludge from four different sources were studied.The results showed that under the same hydrothermal temperature treatment,sludge viscosity,ammonia nitrogen concentration and pH value were greatly affected by the sludge source.Hydrothermal pretreatment had a good modification effect on different sludges.The sludge properties remained basically unchanged after the hydrothermal temperature reached 170℃.There was no significant difference in the gas production rate of sludge from different sources with the increase of OLR,but there were differences in the operation.The gas production performance of anaerobic digestion of sludge from different sources was significantly improved after hydrothermal pretreatment,but there was a significant difference in the proportion of increased gas production rate of VS.Sludge VS gas production rate in Beijing,Shanghai and Shandong was increased by 25.2%~69.8%,as the sludge in Guangxi was pure excess sludge,the gas production rate of VS was increased by 101.6%~133.8%after hydrothermal treatment.However,the increase in gas production per unit VS was not significantly different,and the fluctuation with the change of gas production performance was small,the increase was about 83~218 m^3/t(the average was 143 m^3/t).After hydrothermal pretreatment,the fluidity of the sludge became better,the high-concentration and high-load feed of anaerobic digestion could be realized,and the capacity reduction rate of the reactor could reach 38%
作者
李伟
李让玲
李博文
王佳伟
郭建斌
董仁杰
LI Wei;LI Rangling;LI Bowen;WANG Jiawei;GUO Jianbin;DONG Renjie(Research and Development Center, Beijing Drainage Group Co., Ltd., Beijing 100022, China;College of Engineering, China Agricultural University, Beijing 100083, China)
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2020年第3期326-333,共8页
Transactions of the Chinese Society for Agricultural Machinery
基金
“十二五”国家科技支撑计划项目(2015BAD21B04)
“十三五”国家科技重大专项(2017ZX0740300205)。
关键词
污泥
水热预处理
产气性能
厌氧消化
sludge
thermal hydrolysis pretreatment
gas production performance
anaerobic digestion
