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工藝用于北方某再生水廠提標(biāo)擴(kuò)建工程
- Title:
- Application of A2/O +MBR Process in the Upgrading and Expansion Project of a Water Reclamation Plant in North China
- 關(guān)鍵詞:
- font-size: 10pt; ">提標(biāo)擴(kuò)建工程; MBR; 多段多級A2/O; 脈沖曝氣
- Keywords:
- font-size: 10pt; ">upgrading and expansion project; MBR; multistage A font-size: 10pt; "> 2/O; pulse aeration
- 摘要:
- 北方某再生水廠原設(shè)計規(guī)模為0.8×104 m3/d，采用CASS工藝，出水執(zhí)行《城鎮(zhèn)污水處理廠污染物排放標(biāo)準(zhǔn)》（GB 18918—2002）一級B標(biāo)準(zhǔn)，需提標(biāo)至北京市地方標(biāo)準(zhǔn)《城鎮(zhèn)污水處理廠水污染物排放標(biāo)準(zhǔn)》（DB 11/890—2012）B標(biāo)準(zhǔn)并擴(kuò)容至3×104 m3/d。針對占地小、進(jìn)水濃度高、出水標(biāo)準(zhǔn)高等難點(diǎn)，新建工程(2.5×104 m3/d)采用多段多級A2/O工藝，提標(biāo)工程（0.5×104 m3/d）改造原CASS池為A2/O池，新建與提標(biāo)工程生物池出水一并接入MBR池，并新增臭氧脫色措施以確保出水指標(biāo)達(dá)標(biāo)。實(shí)際運(yùn)行數(shù)據(jù)表明，出水水質(zhì)穩(wěn)定達(dá)標(biāo)，在進(jìn)水水質(zhì)達(dá)到或超過設(shè)計值的情況下，出水氨氮、總氮均值分別為0.7 mg/L和11.2 mg/L。該工程在占地僅增加85%的情況下，處理水量提升2.75倍，擴(kuò)建后噸水占地1 m2/m3；膜池膜組件曝氣采用脈沖曝氣方式，能有效節(jié)能降耗，并延緩膜污堵。
- 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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