环境工程学报2025，Vol.19Issue(9)：2096-2105,10.DOI:10.12030/j.cjee.202501020
连续流好氧颗粒污泥系统中进水负荷和回流方式对污泥颗粒化的影响
Effects of influent loading and return flow mode on sludge granulation in a continuous-flow aerobic granular sludge system
摘要
Abstract
In response to the current issue where most continuous-flow aerobic granular sludge(AGS)reactors increase the height-to-diameter ratio to enhance hydraulic shear force,leading to structural complexity and higher engineering costs,this study proposes a simplified continuous-flow AGS process with low operational difficulty.The design incorporates a novel sludge sieve to provide selective pressure for sludge,utilizes return flow dilution to create feast-famine conditions by reducing substrate concentration at the reactor's rear end,and employs airlift circulation to supply hydraulic shear force,thereby achieving AGS cultivation in a continuous-flow system.A pilot-scale setup was established to validate the feasibility of this process,and the effects of influent load variations and return flow methods on sludge granulation were investigated.The results demonstrated that the proposed continuous-flow AGS system successfully facilitated AGS cultivation,with the proportion of granular sludge(particle size>200 μm)increasing from 4%to 31%within 112 days,and the average particle size growing from 66.0 μm to 157.9 μm.Switching the return flow method from peristaltic pump to airlift enhanced hydraulic shear force,increasing the proportion of protein in extracellular polymeric substances(EPS)and tightly bound EPS,which effectively promoted granulation.After the sludge granulation level improved(reaching 31%granular sludge),the average removal rates of NH4+-N,TN,and COD in the system were 98.1%,71.5%,and 88.5%,respectively.This study successfully achieved AGS cultivation in a continuous-flow system,providing theoretical insights for the practical application of continuous-flow AGS technology in wastewater treatment engineering.关键词
连续流/好氧颗粒污泥/选择压/水力剪切力Key words
continuous-flow/aerobic granular sludge/selection pressure/hydraulic shear force分类
资源环境引用本文复制引用
庄哲宇,陈福明,史绪川,王思琦,陈烁龙,徐方敏,张连,刘淑杰,李艳红..连续流好氧颗粒污泥系统中进水负荷和回流方式对污泥颗粒化的影响[J].环境工程学报,2025,19(9):2096-2105,10.基金项目
深圳市可持续发展专项(KCXFZ20211020163556020) （KCXFZ20211020163556020）
