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.
Application of A2/O +MBR Process in the Upgrading and Expansion Project of a Water Reclamation Plant in North China
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
12
Page:
91-95
Column:
Date of publication:
2020-06-17
- Keywords:
- font-size: 10pt; ">upgrading and expansion project; MBR; multistage A font-size: 10pt; "> 2/O; pulse aeration
- Abstract:
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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.
Last Update:
2020-06-17