董明甫1,孔海霞2,张林1,何文光1,尹天平1,赵茂杰1
(1. 四川安州发展集团有限公司,四川 绵阳 622651;2. 中国市政工程华北设计研究总院有限公司
西安分公司,陕西 西安 710016)
Quality and Efficiency Enhancement Retrofit Project of
an AAO Process in a Sewage Treatment Plant in Sichuan
DONG Ming-fu1,KONG Hai-xia2,ZHANG Lin1,HE Wen-guang1,YIN Tian-ping1,,ZHAO Mao-jie1
(1.Sichuan Anzhou Development Group Co., Lt, Mianyang 622651,China;
2. Xi'an Branch,North China Municipal Engineering Design & Research Institute Co. Ltd., Xi'an 710016, China)
摘 要:四川省某污水处理厂一期工程原采用AAO工艺为主体并在二沉池后端增加“活性炭吸附+高效沉淀”深度处理单元的工艺,根据进厂废水水质进一步优化工艺设计参数,确保出水指标中氨氮、总氮及化学需氧量达到《四川省岷江、沱江流域水污染物排放标准》(DB51/2311-2016)相关标准要求,总磷须达到《地表水环境质量标准》(GB3838-2002)的I类标准(总磷<0.2 mg/L);其余指标达到《城镇污水处理厂污染物排放标准》(GB18918-2002)一级A标,处理后的达标废水经管道就近引至干河子排放。提质改造项目旨在对原有AAO池、水解酸化池、外回流等进行改造优化。提质改造后经过一年运行,结果显示全年平均出水数据NH3-N≤1.5 mg/L、TN≤4.6 mg/L、TP≤0.1 mg/L、COD≤20 mg/L。技改后在节能降耗方面达到明显的改善,吨水药剂、电费、人工综合成本共降低47.56%。
关键词:AAO工艺;提质增效;节能降耗;工程案例
Abstract: The first phase of a wastewater treatment plant in Sichuan Province, China, originally used the AAO (Anoxic/Anaerobic/Oxic) process as the main treatment process, with an additional "activated carbon adsorption + high-efficiency sedimentation" deep treatment unit at the end of the secondary clarifier. Based on the optimization of the influent wastewater quality, the process design parameters were further improved to ensure that the effluent meets the relevant standards of the "Water Pollutant Discharge Standard for Minjiang and Tuojiang River Basins in Sichuan Province" (DB51/2311-2016), with ammonia nitrogen (NH3-N), total nitrogen (TN), and chemical oxygen demand (COD) meeting the Class I standards of the "Environmental Quality Standards for Surface Water" (GB3838-2002) (TP<0.2 mg/L); other indicators meeting the Class A standards of the "Pollutant Discharge Standard for Urban Wastewater Treatment Plants" (GB18918-2002). The treated effluent that meets the standards is discharged to the nearby Ganhezi through pipelines. The quality improvement project aims to optimize the original AAO tank, hydrolysis acidification tank, and internal recirculation. After one year of operation, the results showed that the average annual effluent data were NH3-N≤1.5 mg/L, TN≤4.6 mg/L, TP≤0.1 mg/L, and COD≤20 mg/L. The technical upgrade achieved significant improvements in energy saving and consumption reduction, with a total reduction of 47.56% in unit water dosage of chemicals, electricity costs, and labor costs.
Keywords: AAO process; quality improvement;energy saving and consumption reduction;engineering case
为实现生态文明建设新进步,十九届五中全会提出,持续减少污染物排放总量、持续改善环境质量、提高资源利用效率,环保与可持续发展的理念应当深入到我们每个人的意识中。污水处理作为与良好生态环境直接挂钩的一项,时刻影响着人们的生存与生活。据统计,污水处理中的碳排放量约占碳排放总量的1-2%[1],在碳中和、碳达峰的大背景下,实现污水处理绿色低碳发展已成为全球关注的重要议题。在日益严峻的能源压力和环境挑战的背景下,污水处理厂作为水资源环保的“中转站”,迫切需要通过节能降耗,实现污水处理行业的绿色低碳可持续发展。2025年是“十四五”规划的收官之年,也是碳排放强度下降18%的约束性目标之年,实现减污降碳宏远目标仍需砥砺前行。
1 项目背景
1.1项目概述
四川省某污水厂位于乡镇,占地面积约40.05亩,设计规模1.4万吨/天,2020年建成,2021年投入运行,该项目总投资 15000万元,环保投资545.93万元。该污水处理厂主要工艺流程为粗格栅及提升泵房+细格栅及曝气沉砂池+调节事故池+(化学沉淀池)+水解酸化池+A/A/O生化池+二沉池+活性炭吸附+高密度沉淀池+臭氧接触氧化+紫外线消毒。污水厂设计进水水质为70%生活污水30%工业废水,出水指标中氨氮、总氮及化学需氧量达到《四川省岷江、沱江流域水污染物排放标准》(DB51/2311-2016)相关标准要求,总磷须达到《地表水环境质量标准》(GB3838-2002)的I类标准(总磷<0.2 mg/L);其余指标达到《城镇污水处理厂污染物排放标准》(GB18918-2002)一级A标,处理达标后的废水经管道就近引至干河子排放。