初沉和二沉污泥经高温热水解后的厌氧消化性能  

Anaerobic Digestion Performance of Primary and Secondary Sludge after Hydrothermal Hydrolysis

作　　者：张涵 张含 吴宝利 任征然 王佳伟[2] 齐利格娃 李相昆 ZHANG Han;ZHANG Han;WU Bao‑li;REN Zheng‑ran;WANG Jia‑wei;QI Li‑ge‑wa;LI Xiang‑kun(School of Civil Engineering and Transportation,Hebei University of Technology,Tianjin 300401,China;Beijing Municipal Sewage Resource Engineering Technology Research Center,Science and Technology Research and Development Center of Beijing Urban Drainage Group Co.Ltd.,Beijing 100124,China;North China Municipal Engineering Design and Research Institute Co.Ltd.,Tianjin 300074,China)

机构地区：[1]河北工业大学土木与交通学院,天津300401 [2]北京城市排水集团有限责任公司科技研发中心北京市污水资源化工程技术研究中心,北京100124 [3]中国市政工程华北设计研究总院有限公司,天津300074

出　　处：《中国给水排水》2023年第13期32-38,共7页China Water & Wastewater

基　　金：国家自然科学基金资助项目(52000057)。

摘　　要：以北京某大型污水处理厂的初沉污泥、剩余活性污泥为研究对象,通过考察厌氧消化系统的生物产甲烷潜力(BMP)、有机物降解能力,以及水解、产酸、产甲烷率、系统稳定性等,探讨了初沉池污泥和二沉池污泥经高温热水解预处理后的厌氧消化性能。结果表明,在厌氧消化阶段,初沉热水解污泥的产气率和有机物降解率相比初沉原泥均无明显提高;相比原泥,二沉池剩余污泥经热水解后最高日产气率、总固体(TS)累积产气率分别提高了67%、80%左右,总化学需氧量(TCOD)、总蛋白、总糖的降解率分别提高了5%、7%、14%。高温热水解工艺对提高剩余污泥的水解率、产酸率、产甲烷率效果更加明显。从系统稳定性方面看,初沉污泥高温热水解后可能会造成厌氧消化系统出现挥发性脂肪酸(VFA)大量积累,导致系统不稳定,影响产气速率;而热水解后的剩余污泥厌氧消化系统能够保持稳定运行。综合来看,剩余活性污泥更适合采用热水解预处理,初沉污泥可不进行热水解预处理。Taking the sludge of primary sedimentation tank(primary sludge)and secondary sedimentation tank(excess activated sludge)respectively from a large‑scale wastewater treatment plant in Beijing as the research object,the anaerobic digestion(AD)performance fed with the pretreatment sludge by high temperature thermal hydrolysis(TH)was investigated.For this purpose,biological methane production potential(BMP),organic matter degradation capacity,hydrolysis,acid production,methane production rate and system stability were all concerned.The results showed that in the AD stage,the gas production rate and organic matter degradation rate of the primary sludge were not significantly higher than that of the excessive activated sludge.Compared with the sludge without TH,the maximum daily gas production rate and TS cumulative gas production rate of excess activated sludge increased by 67%and 80%respectively after TH,and the TCOD degradation rate,total protein degradation rate and total sugar degradation rate increased by 5%,7%and 14%respectively.The high‑temperature TH pretreatment was more effective in improving the hydrolysis rate,acid production rate and methane production rate for excess activated sludge in AD system.For the system stability,a large amount of VFA accumulated in the AD system when fed with primary sludge after TH,which leaded to system instability and gas production decrease.Meanwhile,the AD system fed with excess activated sludge with TH pretreatment kept stable.In general,the excess activated sludge from secondary sedimentation tank was more suitable for high temperature TH pretreatment,however the sludge from primary tank had better feed AD system directively without TH.

关 键 词：初沉污泥 剩余活性污泥 热水解 厌氧消化 系统稳定性 

分 类 号：TU992[建筑科学—市政工程]