摘要
采用上向流厌氧滤池(UAF)处理实际生活污水,研究中温条件下水力停留时间(hydraulic retention time,HRT)对系统运行效果及优势产甲烷菌群的影响.结果表明,在35℃,HRT为24h条件下,系统启动28d后化学需氧量(chemical oxygen demand,COD)去除率可达75%以上.HRT由24h降至2.5h的过程中,COD去除率呈现先上升后下降的趋势,在HRT为5h时最高,平均去除率为81.71%,最高可达87.18%,当降至2.5h后,COD去除率降至75.12%.甲烷产率(每消耗单位质量底物产生的甲烷的量,以CH4/CODre计)及甲烷体积分数随HRT的降低而增高,HRT为2.5h时为0.30L·g^-1,甲烷体积分数维持在73%左右,经能耗核算后可得系统产能可满足蠕动泵能耗需求.对系统内主要的产甲烷菌进行定量分析表明,乙酸营养型产甲烷菌Methanosarcinales丰度最高,为优势菌群,随着HRT的逐渐降低,乙酸营养型和氢营养型产甲烷菌的丰度都有大幅度提高.
Upflow anaerobic filter (UAF) with actual domestic wastewater were examined in this study.The Impacts of hydraulic retention time (HRT) on the performance of a UAF and a primary methanogen group were investigated at mesophilic conditions.The chemical oxygen demand (COD) removal rate was more than 75% after 28 days acclimation at 35℃ and HRT of 24 h.With a gradual decrease in the HRT,the COD removal rate first increased and then decreased.When the HRT was 5 h,the COD removal rate was the highest,with an average 81.71% and a maximum of 87.18%.When the HRT decreased to 2.5 h,the average COD removal rate decreased to 75.12%.The methane produced per unit mass of substrate consumed (CH4/CODre ) and volume fraction increased with a decrease in HRT.When the HRT was 2.5 h,it reached 0.30 L·g^-1,and the volume fraction of methane was maintained at about 73%.The energy generated by the system met the energy demands of the peristaltic pump.Quantitative analysis of the primary methanogen group in the system indicates that Methanosarcinales is the dominant in the system.With a decrease in HRT,the abundances of acetoclastic and hydrogenotrophic methanogens increased significantly.
作者
杨忠启
刘秀红
李海鑫
刘智斌
刘润雨
杨庆
YANG Zhong-qi;LIU Xiu-hong;LI Hai-xin;LIU Zhi-bin;LIU Run-yu;YANG Qing(National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology,College of Environmental and Energy Engineering,Beijing University of Technology,Beijing 100124,China)
出处
《环境科学》
EI
CAS
CSCD
北大核心
2019年第9期4121-4127,共7页
Environmental Science
基金
国家自然科学基金项目(51878011)
北京市自然科学基金项目(8182012)
