首页|连续流中氮负荷对好氧颗粒污泥稳定性的影响

连续流中氮负荷对好氧颗粒污泥稳定性的影响

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考察了连续流反应器中好氧颗粒污泥(AGS)处理无机高氨氮废水的脱氮性能及稳定性.接种成熟AGS启动连续流反应器,运行第1～55 d内进水氮负荷由初始时的1.0 kg/(m3·d)逐步升至4.0 kg/(m3·d),第56～125 d内氮负荷逐步降至1.4 kg/(m3·d),第126～145 d氮负荷再次升至2.0 kg/(m3·d).前75 d内观察到明显的AGS破碎及流失现象,且颗粒平均粒径不断减小;虽然多次补充接种AGS可维持系统的稳定性,但前 80 d内颗粒的污泥容积指数(SVI)、胞外聚合物(EPS)及比耗氧速率(SOUR)剧烈波动.其中,第 91～109 d反应器原位闲置.系统重新运行后,AGS的理化指标逐渐趋于稳定.前45 d内AGS对氨氮去除率逐渐升至98%以上;46～75 d内AGS对氨氮去除率迅速降至 50%后又回升至 99%以上;总无机氮去除率基本维持为 35%～45%.考察了连续流反应器对污泥选择性筛分的效果,利用高通量测序分析污泥菌群组成变化.结果表明,当沉淀池中挡板深度为27 cm时,反应器对污泥截留率在98%以上,出水污泥粒径多为0～0.30 mm.与刚接种AGS相比,运行145 d时AGS中的硝化细菌属(Nitrosomonas)相对丰度明显增大,而反硝化细菌属(unclassified_Bacteria、Thauera、Truepera等)的相对丰度略有降低.
Effect of nitrogen loading rate on stability of aerobic granular sludge in continuous flow
The denitrification performance and stability of aerobic granular sludge(AGS)treatment on inorganic wastewater with high ammonia nitrogen in a continuous flow reactor were investigated.The reactor was started by seeding with mature AGS.It was observed that the influent nitrogen loading rate was gradually increased from 1.0 kg/(m3·d)to 4.0 kg/(m3·d)in the first 55 d,gradually decreased to 1.4 kg/(m3·d)from 56～125 d,and then increased to 2.0 kg/(m3·d)again in 126～145 d.Obvious particle breakage and sludge loss were observed,and the average particle size decreased continuously in the first 75 d.Although the seed sludge was supplemented several times to maintain the stability of the system,the sludge volume index(SVI),extracellular polymeric substance(EPS)and specific oxygen uptake rate(SOUR)of the granules fluctuated sharply in the first 80 d.The reactor was then idled in place from 91～109 d,and the physical and chemical indexes of AGS gradually became stable when the system was re-started.The removal efficiency of NH4+-N gradually increased to more than 98%in the first 45 d,rapidly decreased to approximately 50%in 46～75 d,and then rose to>99%again.The total inorganic nitrogen removal efficiency was basically maintained between 35%and 45%.The effect of the continuous flow reactor on the selective screening of sludge was investigated,and the changes in the composition of sludge microflora were analyzed by high-throughput sequencing.The results showed that when the depth of the baffle in the sedimentation tank was 27 cm,the sludge retention rate of the reactor was above 98%,and the particle size of effluent sludge was mostly 0～0.30 mm.Compared with those of the seed AGS,the relative abundance of nitrifying bacterial genus(Nitrosomonas)in AGS on 145 d increased significantly,while the relative abundance of denitrifying bacterial genera(such as unclassified_Bacteria,Thauera and Thauera)decreased slightly.

aerobic granular sludgecontinuous flowinorganic wastewaternitrogen loadingstabilitywater treatment technology

李正昊、罗怡、龙焙、胡玉娜、聂嘉乐、程媛媛

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江西理工大学 土木与测绘工程学院,江西 赣 341000

好氧颗粒污泥 连续流 无机废水 氮负荷 稳定性 水处理技术

国家自然科学基金江西理工大学清江青年英才支持计划江西理工大学研究生创新专项江西省大学生创新创业训练计划

52060007JXUSTQJYX2020008XY2022-S128S202210407024

2024

10.13550/j.jxhg.20230305

精细化工
大连化工研究院设计院 中国化工学会精细化工专业委员会 辽宁省化工研究院

精细化工

CSTPCD北大核心
影响因子：0.557
ISSN：1003-5214
年,卷(期)：2024.41(1)
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