为解决好氧颗粒污泥(AGS)在生活污水中造粒时间长、稳定性差的问题,采用在人工配水中逐渐添加生活污水的方式改变进水水质,研究AGS造粒过程及脱氮除碳的效果。在4个序批式反应器(SBR)中培养AGS,接种污泥均为污水厂A2/O工艺二沉池污泥。25 ℃ 时,R1进水1~17 d为人工配水,18 d后改为生活污水;R2进水分阶段改变人工配水比例,最终为生活污水;R3进水为人工配水。R4温度为15 ℃,进水为人工配水。结果表明,水质和温度导致R1、R4的胞外聚合物(EPS)中蛋白质(PN)和多糖(PS)波动增加,R2、R3的PN和PS呈上升趋势,且AGS的沉降速度随着PN增大而增大。25 ℃ 时,污泥沉降指数(SVI)与EPS呈负相关。两种温度下均可成功培养出AGS,25 ℃时,在人工配水中逐渐添加生活污水的进水方式可缩短AGS在实际生活污水中的造粒时间,且沉降性能更优。研究结果可为AGS处理生活污水提供参考。
Abstract
To address the issue of prolonged granulation time and poor stability of aerobic granular sludge (AGS) in domestic wastewater treatment, a gradual transition approach is proposed by gradually introducing domestic wastewater into artificial water, aiming to investigate the granulation process of AGS and its denitrification and decarbonization efficiency. AGS was cultivated in four sequencing batch reactors (SBRs), and the inoculum used was the settled sludge from the secondary sedimentation tank of the A2/O process in a wastewater treatment plant. At a temperature of 25 ℃, R1 received artificial water for the first 17 days, followed by a switch to domestic wastewater on the 18th day. In R2, the artificial water proportion was gradually reduced over stages until domestic wastewater reaches 100%. R3 only received artificial water throughout the experiment, while R4 operated at a lower temperature of 15 ℃ and received artificial water. The results revealed that water quality and temperature variations caused increased fluctuations in protein (PN) and polysaccharide (PS) content in the extracellular polymeric substances (EPS) of R1 and R4. R2 and R3 exhibited an upward trend in PN and PS content, and the settling velocity of AGS increased with higher PN content. At 25 ℃, the sludge volume index (SVI) showed a negative correlation with EPS. Successful cultivation of AGS was achieved at both temperatures. Specifically, at 25 ℃, the gradual transition approach by introducing domestic wastewater into artificial water resulted in a shorter granulation time of AGS in real domestic wastewater, along with enhanced settling performance. These research findings provide valuable insights for AGS-based treatment of domestic wastewater.
关键词
水质 /
好氧颗粒污泥(AGS) /
胞外聚合物(EPS) /
脱氮除碳 /
生活污水
Key words
water quality /
aerobic granular sludge (AGS) /
extracellular polymer substances (EPS) /
nitrogen and carbon removal /
domestic sewage
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基金
甘肃省科技计划项目(20JR2RA002);甘肃省黄河水环境重点实验室开放基金(21YRWEK006);甘肃省高等学校产业支撑计划项目(2020C-38);兰州交通大学天佑创新团队项目(TY202005);兰州市科技计划项目(2021-1-180)
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