首页|全流程分析揭示同步化学除磷对倒置AAO工艺的潜在影响

全流程分析揭示同步化学除磷对倒置AAO工艺的潜在影响

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为了积极响应《关于推进污水处理减污降碳协同增效的实施意见》,全面推进城镇污水处理行业的减污降碳,对无锡市某同步化学除磷污水处理厂开展全流程分析,诊断除磷药剂聚合氯化铝铁(PAFC)投加对工艺稳定性的影响,探究倒置AAO工艺节药方式.该厂采用缺氧/厌氧/好氧(倒置AAO)工艺,处理规模达15万m3/d,长期通过投加PAFC保障出水水质稳定.全流程分析发现,该厂一期工艺PAFC药耗逐年增加,尽管实现了 TP的高效去除(98%),但残留的PAFC大量回流至厌氧段,导致磷酸盐提前去除,恶化活性污泥(AS)吸磷能力,吸磷速率仅为0.44 mg P/(g SS·h).因此,进一步开展了一期工艺PAFC药耗调节实验,以期逐步恢复AS吸磷能力.结果表明,将PAFC投加量控制在0.027~0.053 kg/m3即可实现磷酸盐的稳定去除,同时保障污泥沉降性能,而较高投加量的PAFC(≥0.077 kg/m3)将快速去除磷酸盐,并明显抑制好氧吸磷过程.
UNCOVERING THE POTENTIAL IMPACT OF SIMULTANEOUS CHEMICAL PHOSPHORUS REMOVAL ON AN INVERTED AAO SYSTEM BY WHOLE PROCESS DIAGNOSIS METHOD
In order to respond to the Implementation Opinions on Promoting Synergy and Efficiency Enhancement of Wastewater Treatment for Pollution and Carbon Reduction,and comprehensively promote the reduction of pollution and carbon emissions in the urban wastewater treatment industry,a whole process analysis was conducted on a simultaneous chemical phosphorus removal WWTP in Wuxi,to diagnose the impact of phosphorus removal agent dosage on process stability,and explore the agent-saving method of the inverted AAO process.This WWTP adopts an Anoxic/Anaerobic/Aerobic(inverted AAO)process,with a treatment capacity of 150000 m3/d.The stable effluent quality is ensured through the long-term addition of PAFC.Through the whole process analysis,it was found that the PAFC consumption in the phase Ⅰ project of the WWTP has been increasing year by year.Although the efficient removal of TP(98%)has been achieved,a large amount of residual PAFC flows back to the anaerobic section,leading to early removal of phosphorus and deterioration of the phosphorus absorption capacity of activated sludge(AS).The phosphorus absorption rate was only 0.44 mg P/(g SS·h).Therefore,this study further conducted the PAFC dosage regulation experiment in the Phase Ⅰ project to gradually restore the phosphorus absorption capacity of AS.The results showed that a controlled PAFC dosage at 0.027 kg/m3 to 0.053 kg/m3 can help achieve stable removal of phosphorus while ensuring sludge settling performance.However,PAFC with a higher dosage(0.077 kg/m3 above)will quickly remove phosphorus and significantly inhibit the aerobic phosphorus absorption process.

inverted AAO systemsimultaneous chemical phosphorus removalwhole process diagnosissedimentation performancePAFC

严超、施俊、周娟娟、周瑜、严雪琦、陶翔、邵彦鋆、王燕、陈思思、李激

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无锡市水务集团有限公司,江苏无锡 214000

江南大学环境与生态学院江苏省厌氧生物技术重点实验室,江苏无锡 214122

江苏省高校水处理技术与材料协同创新中心,江苏苏州 215009

倒置AAO工艺 同步化学除磷 全流程分析 沉降性能 聚合氯化铝铁

国家重点研发计划

2023YFC3804700

2024

环境工程
中冶建筑研究总院有限公司,中国环境科学学会环境工程分会

环境工程

CSTPCD
影响因子:0.958
ISSN:1000-8942
年,卷(期):2024.42(9)