GAO Wei-nan.Application of A2/O +MBR Process in the Upgrading and Expansion Project of a Water Reclamation Plant in North China[J].China Water & Wastewater,2020,36(12):91-95.
A2/O+MBR工艺用于北方某再生水厂提标扩建工程
- Title:
- Application of A2/O +MBR Process in the Upgrading and Expansion Project of a Water Reclamation Plant in North China
- 关键词:
- font-size: 10pt; ">提标扩建工程; MBR; 多段多级A2/O; 脉冲曝气
- Keywords:
- font-size: 10pt; ">upgrading and expansion project; MBR; multistage A font-size: 10pt; "> 2/O; pulse aeration
- 摘要:
-
北方某再生水厂原设计规模为0.8×104 m3/d，采用CASS工艺，出水执行《城镇污水处理厂污染物排放标准》（GB 18918—2002）一级B标准，需提标至北京市地方标准《城镇污水处理厂水污染物排放标准》（DB 11/890—2012）B标准并扩容至3×104 m3/d。针对占地小、进水浓度高、出水标准高等难点，新建工程(2.5×104 m3/d)采用多段多级A2/O工艺，提标工程（0.5×104 m3/d）改造原CASS池为A2/O池，新建与提标工程生物池出水一并接入MBR池，并新增臭氧脱色措施以确保出水指标达标。实际运行数据表明，出水水质稳定达标，在进水水质达到或超过设计值的情况下，出水氨氮、总氮均值分别为0.7 mg/L和11.2 mg/L。该工程在占地仅增加85%的情况下，处理水量提升2.75倍，扩建后吨水占地1 m2/m3；膜池膜组件曝气采用脉冲曝气方式，能有效节能降耗，并延缓膜污堵。
- Abstract:
-
A water reclamation plant in north China, the original CASS process treatment capacity was 8 000 m 3 /d and the effluent quality was required to meet the first class B standard of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002). It must be raised to B standard of Beijing local standard Discharge Standard of Water Pollutants for Municipal Wastewater Treatment Plants(DB 11/890-2012) and expanded to 3×104 m3/d. The upgrading and expansion mainly face difficulties such as scarce land occupation, high quality concentration of influent water, and the stricter effluent standards. Multistage A2/O process was used in new construction project (2.5×104 m3/d), and CASS process was transformed into A2/O process in upgrading project (5 000 m3/d). The effluent of new construction and upgrading project flow into following MBR together, and ozone decolorization was also applied to ensure the design target. Actual operation results showed that effluent quality totally met the design standard. When the influent water quality reached or exceeded the design value, the average values of ammonia nitrogen and total nitrogen in the effluent were 0.7 mg/L and 11.2 mg/L, respectively. With the land occupation increase only 85%, the treatment scale is increased by 2.75 times. After the expansion, the plant occupies only 1 m2/m3. The membrane module aeration adopts pulse aeration method, in order to effectively save energy and reduce consumption, and delay membrane fouling.
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