WANGJing,YANGYi,BAIWen-long,et al.Application of Multi-stage A/O and Ozonation Combined Process for Upgrading and Reconstruction of a Wastewater Treatment Plant to Class Quasi-Ⅲ Standard for Surface Water[J].China Water & Wastewater,2025,41(6):83-88.
多级A/O+臭氧氧化工艺用于污水厂准Ⅲ类水提标改造
- Title:
- Application of Multi-stage A/O and Ozonation Combined Process for Upgrading and Reconstruction of a Wastewater Treatment Plant to Class Quasi-Ⅲ Standard for Surface Water
- Keywords:
- wastewater treatment plant; upgrading and reconstruction; ozonation; class quasi-Ⅲ standard for surface water
- 摘要:
- 鄂尔多斯市某污水处理厂原设计规模为6.0×104 m3/d，主体工艺采用氧化沟+二沉池+混凝沉淀池+砂滤池，设计出水水质执行《城镇污水处理厂污染物排放标准》（GB 18918—2002）的一级A标准。由于污水厂出水的受纳水体下游为水源地，需对现状污水处理工艺进行提标改造，使出水水质达到地表水准Ⅲ类标准。为此，根据污水厂实际处理水量，将设计规模调整为4.5×104 m3/d，将现状氧化沟工艺改造为多级A/O（A/A/O/A/O）运行模式，并在一级好氧池投加填料，强化处理能力的同时提高冬季抗冲击负荷能力，另外新建臭氧接触池进行深度处理。改造后，系统的抗冲击负荷能力增强，出水水质稳定，出水COD、NH3-N、TP平均浓度分别为12.8、0.14、0.08 mg/L，优于地表水Ⅲ类标准；出水TN平均浓度为9.4 mg/L，满足再生水回用和尾水排放要求。
- Abstract:
- The original design scale of a wastewater treatment plant (WWTP) in Ordos City is 6.0×104 m?/d. The primary treatment process incorporates oxidation ditch, followed by secondary sedimentation tank, coagulation sedimentation tank, and sand filter. The effluent quality is designed to meet first level A criteria specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002). Given that the receiving water body downstream of the WWTP serves as the drinking water source, it is imperative to upgrade the existing wastewater treatment process to ensure that the effluent quality meets the class quasi-Ⅲ standard specified in Environmental Quality Standards for Surface Water (GB 3838-2002). In accordance with the actual treatment capacity of the WWTP, the design capacity scale was adjusted to 4.5×104 m3/d. The existing oxidation ditch process was modified to the multi-stage A/O (A/A/O/A/O) system, and fillers were introduced into the primary-aeration tank to enhance treatment efficiency and improve resistance to shock loads in winter. Additionally, a new ozone contact tank was constructed for advanced treatment. Following the reconstruction, the system’s resistance to shock loads was significantly enhanced and the effluent quality was stable. The average concentrations of COD, NH3-N and TP in the effluent were 12.8 mg/L, 0.14 mg/L, and 0.08 mg/L, respectively, all of which were lower than the class Ⅲ limits specified in the surface water standard. Additionally, the average concentration of TN in the effluent was 9.4 mg/L, satisfying the requirements for both reclaimed water reuse and tailwater discharge.
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