ZHANGQiang,XIAHai-xia,PENGYong-li,et al.Design Case of In-situ Upgrading and Reconstruction of a Large-scale Wastewater Treatment Plant in Lanzhou[J].China Water & Wastewater,2025,41(4):69-74.
兰州某大型污水厂原位提标改造工程设计实例
- Title:
- Design Case of In-situ Upgrading and Reconstruction of a Large-scale Wastewater Treatment Plant in Lanzhou
- 关键词:
- 污水处理厂; 原位改造; 提标扩容; 固定生物膜活性污泥工艺
- Keywords:
- wastewater treatment plant; in-situ reconstruction; upgrading and expansion; integrated fixed?film activated sludge (IFAS) process
- 摘要:
- 为满足强化黄河流域生态环境保护、削减污染物入河量的需求，兰州某污水处理厂需同时进行扩容提标，处理规模由26×104 m3/d扩大至30×104 m3/d，出水水质由《城镇污水处理厂污染物排放标准》（GB 18918—2002）一级B标准提高至一级A标准。针对扩容体量大、可用土地少及排放标准严等问题，制定了提标改造决策思路；通过挖掘老旧设施潜力、利用竖向位置空间、原位耦合高负荷固定生物膜活性污泥（IFAS）工艺，形成多元处理路线。其核心在于生化处理段采用“大池型削减负荷，小池型耦合IFAS”的改造手段；泥水分离段采用“二沉池降低负荷，MBR补足空缺”的组合形式；深度处理段采用“磁混凝+回转式精密过滤器”的固液分离保障。结果表明，改造后出水COD、BOD5、NH3-N、TN、TP、SS分别为（23.2±2.9）、（5.3±2.8）、（1.7±0.9）、（9.4±3.4）、（0.2±0.1）、（4.6±2.2） mg/L，出水水质稳定且优于设计标准。
- Abstract:
- To address the imperative of enhancing ecological and environmental protection within the Yellow River basin and to mitigate the influx of pollutants into the river, a wastewater treatment plant in Lanzhou was mandated to simultaneously augment its capacity and elevate its discharge standard. Specifically, the treatment capacity should be expanded from 26×104 m3/d to 30×104 m3/d, while the effluent quality should be upgraded from the first level B limit to the first level A limit specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002). Considering the challenges of substantial expansion requirements, limited available land, and stringent discharge standard, a technical decision-making route for upgrading and reconstruction was developed. By leveraging the potential of existing facilities, utilizing vertical spaces, and implementing an in-situ coupled high-load integrated fixed-film activated sludge (IFAS) process, a multi-treatment approach was established. The core of this approach lay in the transformation method of “load reduction through large tank, small tank coupled with IFAS” in the biochemical treatment section. The sludge?water separation section employed a combined approach featuring “secondary sedimentation tank to reduce the load, MBR to fill the gap”. The advanced treatment section utilized a solid-liquid separation system comprising “magnetic coagulation in conjunction with a rotary precision filter”. Following the transformation, the effluent COD, BOD5, NH3-N, TN, TP and SS were (23.2±2.9) mg/L, (5.3±2.8) mg/L, (1.7±0.9) mg/L, (9.4±3.4) mg/L, (0.2±0.1) mg/L and (4.6±2.2) mg/L, respectively. The effluent quality remains stable and is always lower than the design discharge standard.
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