Application of OAAO-MBR process for upgrading and reconstruction of municipal wastewater treatment plant

doi:10.19965/j.cnki.iwt.2024-0530

Abstract

Abstract:

Aiming at the dilemma of the difficulty in meeting the standard of effluent TN stably in a modified anaerobic-anoxic-aerobic-membrane bioreactor (AAO-MBR) treatment process of an all-underground municipal wastewater treatment plant in Taihu Basin, this research employed the oxic-anoxic-anaerobic-oxic-membrane bioreactor (OAAO-MBR) process based on optimal control of DO and ORP for upgrading and reconstruction. By appropriate regulation of the operating environment, stable improvement of effluent wastewater quality was achieved. Our research showed that the effluent COD, NH₄ ⁺-N, TN and TP of the OAAO-MBR process were controlled within 30,1.5, 10 and 0.3 mg/L, respectively, which could meet the effluent quality of Suzhou special discharge limit value. Compared with the same period before upgrading and reconstruction, the carbon source consumption for nitrogen removal by OAAO-MBR process was reduced by 33.16%. Combined with the transformation of nitrogen pollutants and microbial community structure in each treatment unit, it was speculated that Nitrospira and Ellin6067 played the role of short-range nitrification in anoxic Ⅰ zone, while Nitrospira and Nitrosomonas played a role of nitrification in aerobic zone. Denitrification was widely observed in each treatment unit, specifically, Bacillus played an important role in aerobic zone as a typical aerobic denitrifying bacterium.

Key words: municipal wastewater treatment plant, upgrading and reconstruction, OAAO-MBR process, ORP control, nitrogen removal mechanism

摘要：

针对太湖流域某全地下式市政污水处理厂改良型厌氧-缺氧-好氧-膜生物反应器（AAO-MBR）处理工艺存在的出水TN难以稳定达标的困境，采用基于DO和氧化还原电位（ORP）优化控制的兼氧-微氧-微氧-好氧-膜生物反应器（OAAO-MBR）工艺进行提标改造。通过对运行环境的合理调控，实现出水水质的稳定提升。研究结果表明，OAAO-MBR工艺的膜出水COD、NH₄ ⁺-N、TN、TP分别控制在30、1.5、10、0.3 mg/L以内，均能满足苏州特别排放限值规定的出水水质。与改造前同期相比，OAAO-MBR工艺对脱氮的碳源消耗减少了33.16%。结合各处理单元氮污染物转化及微生物群落结构推测，Nitrospira和Ellin6067在微氧Ⅰ区起短程硝化作用，Nitrospira与Nitrosomonas在好氧区起硝化作用；反硝化反应广泛存在于各处理单元中，其中Bacillus作为典型好氧反硝化菌在好氧区发挥重要作用。

关键词: 市政污水处理厂, 提标改造, OAAO-MBR工艺, ORP控制, 脱氮机制

CLC Number:

X703

Kaining ZHAO, Shengyin TANG, Yuepeng DENG, Shijian ZHANG, Kai YANG, Min GUO, Xihui ZHANG. Application of OAAO-MBR process for upgrading and reconstruction of municipal wastewater treatment plant[J]. Industrial Water Treatment, 2025, 45(4): 176-185.

赵凯宁, 唐升引, 邓岳鹏, 张诗剑, 杨锴, 郭民, 张锡辉. OAAO-MBR工艺在市政污水处理厂提标改造中的应用[J]. 工业水处理, 2025, 45(4): 176-185.

/ / Recommend / Download Citations

URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2024-0530

https://www.iwt.cn/EN/Y2025/V45/I4/176

Figures/Tables 14

Table 1 Designed wastewater qualities in influent and effluent

项目	COD	BOD₅	SS	NH $4 +$ -N	TN	TP
设计进水	≤350	≤150	≤210	≤42.0	≤48.0	≤5.40
设计出水	≤30	≤6	≤10	≤1.5	≤10.0	≤0.30

Table 1 Designed wastewater qualities in influent and effluent

项目	COD	BOD₅	SS	NH $4 +$ -N	TN	TP
设计进水	≤350	≤150	≤210	≤42.0	≤48.0	≤5.40
设计出水	≤30	≤6	≤10	≤1.5	≤10.0	≤0.30

Fig.1 Flow chart of original improved AAO-MBR process

Fig.2 Flow chart of OAAO-MBR process for upgrading and reconstruction

Fig.3 Layout diagram of each treatment unit of OAAO-MBR

Table 2 Key control parameters for each treatment unit of OAAO-MBR process

参数	DO/（mg·L^-1）	ORP/mV	HRT/h
兼氧区	0.5~1.0	50~150	1.66
微氧Ⅰ区	0.2~0.5	-100~50	2.82
微氧Ⅱ区	≤0.2	-300～-100	3.63
好氧区	≥2.0	≥100	1.83

Fig.4 Removal performances of COD during different operation periods of the upgrading and reconstruction

Fig.5 Removal performances of TN during different operation periods of the upgrading and reconstruction

Fig.6 Removal performances of NH₄ ⁺-N during different operation periods of the upgrading and reconstruction

Fig.7 Removal performances of NO₃ ^--N by OAAO-MBR process after the upgrading and reconstruction

Fig.8 Removal performances of TP during different operation periods of the upgrading and reconstruction

Fig.9 The variations of DO during different operation periods of the upgrading and reconstruction

Fig.10 ORP in different treatment units of OAAO-MBR process in spring and summer after the upgrading and reconstruction

Table 3 Alpha diversity of microbial community composition in different treatment units of OAAO process

多样性参数	兼氧区	微氧Ⅰ区	微氧Ⅱ区	好氧区
Richness	1 761	1 816	1 837	1 772
Chao1	1 761.6	1 816.7	1 837.5	1 772.3
Shannon	207	204	190	189
Simpson	0.012 8	0.014 0	0.014 8	0.015 1
Equitability	0.714	0.709	0.698	0.701

Fig.11 Relative abundance of AOB，NOB，and DNB（a），total relative abundance of AOB，NOB，and DNB in each treatment unit of OAAO-MBR process（b）

References 11

1	FU Xinrong， HOU Rongrong， YANG Peng，et al. Application of external carbon source in heterotrophic denitrification of domestic sewage：A review［J］. Science of the Total Environment，2022，817：153061. doi:10.1016/j.scitotenv.2022.153061
2	邓岳鹏，赵鹏，唐升引，等. OAAO-陶瓷膜MBR一体化工艺用于市政污水厂扩容工程［J］. 工业水处理，2024，44（10）：201-206.
	DENG Yuepeng， ZHAO Peng， TANG Shengyin，et，al. Integrated OAAO-ceramic membrane MBR process for the capacity expansion of municipal wastewater treatment plant［J］. Industrial Water Treatment，2024，44（10）：201-206.
3	国家环境保护总局. 水和废水检测分析方法［M］. 北京：中国环境出版社，2002：210-280.
	The State Environmental Protection Administration. Water and wastewater monitoring and analysis method［M］. Beijing：China Environmental Science Press，2002：210-280.
4	SHI Chongwen， TONG Man， CAI Qizheng，et al. Electrokinetic-enhanced bioremediation of trichloroethylene-contaminated low-permeability soils：Mechanistic insight from spatio-temporal variations of indigenous microbial community and biodehalogenation activity［J］. Environmental Science & Technology，2023，57（12）：5046-5055. doi:10.1021/acs.est.3c00278
5	GAO Dawen， PENG Yongzhen， LIANG Hong，et al. Using oxidation-reduction potential（ORP） and pH value for process control of shortcut nitrification-denitrification［J］. Journal of Environmental Science and Health. Part A，Toxic/Hazardous Substances & Environmental Engineering，2003，38（12）：2933-2942. doi:10.1081/ese-120025842
6	荣宏伟，谢玉辉，张可方，等. DO对SBBR工艺亚硝酸型SND及过程控制的影响［J］. 中国给水排水，2012，28（13）：103-108.
	RONG Hongwei， XIE Yuhui， ZHANG Kefang，et al. Effect of DO on simultaneous nitrification and denitrification via nitrite and its process control in sequencing batch biofilm reactor［J］. China Water & Wastewater，2012，28（13）：103-108.
7	GAO Dawen， PENG Yongzhen， LI Baikun，et al. Shortcut nitrification-denitrification by real-time control strategies［J］. Bioresource Technology，2009，100（7）：2298-2300. doi:10.1016/j.biortech.2008.11.017
8	YAN Yuan， LEE J， HAN I，et al. Comammox and unknown ammonia oxidizers contribute to nitrite accumulation in an integrated A-B stage process that incorporates side-stream EBPR（S2EBPR）［J］. Water Research，2024，253：121220. doi:10.1016/j.watres.2024.121220
9	SUN Zhiye， LI Yi， LI Ming，et al. Steel pickling rinse wastewater treatment by two-stage MABR system：Reactor performance，extracellular polymeric substances（EPS） and microbial community［J］. Chemosphere，2022，299：134402. doi:10.1016/j.chemosphere.2022.134402
10	LACKNER S， HORN H. Evaluating operation strategies and process stability of a single stage nitritation-anammox SBR by use of the oxidation-reduction potential（ORP）［J］. Bioresource Technology，2012，107：70-77. doi:10.1016/j.biortech.2011.12.025
11	ZUO Jialiang， XU Lina， GUO Jianlin，et al. Microbial community structure analyses and cultivable denitrifier isolation of Myriophyllum aquaticum constructed wetland under low C/N ratio［J］. Journal of Environmental Sciences，2023，127：30-41. doi:10.1016/j.jes.2022.04.010

[1]	Minmin CHEN, Jie LIU, Li’na LI, Lili QIU, Weiwei YANG, Hong JING. Analysis of the status and influencing factors of sludge yield coefficient of municipal wastewater treatment plants in China [J]. Industrial Water Treatment, 2024, 44(3): 24-29.
[2]	Bo YU, Jiao MA, Xiaoning LI, Pengfei SHEN. Analysis of operation efficiency and carbon emission of quasi Class Ⅳ upgrading and reconstruction of a sewage treatment plant [J]. Industrial Water Treatment, 2024, 44(10): 222-230.
[3]	Qianling CHEN, Kun LI, Xi LIU, Wenxu MO, Chunmin XIE, Chuanshun LIANG, Xiaoli DONG, Lihai LU. Application of up-flow heterogeneous oxidation Fenton technology on upgrading and reconstruction engineering of wastewater treating [J]. Industrial Water Treatment, 2023, 43(8): 172-178.
[4]	Xuyong ZHAO, Xin XU, Yongming WU, Mi DENG. Application of hydrolysis acidification-BBR-high efficiency sedimentation in improving quality and efficiency of wastewater treatment plant [J]. Industrial Water Treatment, 2022, 42(7): 173-178.
[5]	Pingbo LIU, Jun ZHANG, Jiale WANG, Hui WANG, Yao ZHAO. Case analysis on the application of BioDopp technology in upgrading of sewage treatment [J]. Industrial Water Treatment, 2022, 42(1): 163-166.
[6]	Jianlei Gao,Wei Weng,Yixin Yan,Wenhao Wang. Operation of municipal wastewater treatment plant with improved CASS process for high proportion of industrial wastewater [J]. Industrial Water Treatment, 2021, 41(3): 125-128, 136.
[7]	Xiaojun MENG,Xiaosong GONG,Qiuli WANG. Diversity of anaerobic ammonium oxidizing bacteria in mainstream wastewater treatment plants [J]. Industrial Water Treatment, 2021, 41(12): 83-88.
[8]	Jie CHU. Pilot-scale application of high-efficiency fiber bundle filter for upgrading and reconstruction of sewage treatment plant [J]. Industrial Water Treatment, 2021, 41(11): 99-102.
[9]	Yan SHI,Danyu XU,Yunping TANG,Yunxia DUAN. Membrane-aerated biofilm reactor and its application in upgrading of sewage treatment plant [J]. Industrial Water Treatment, 2021, 41(10): 22-27.
[10]	Chenxiao Yang,Mingjun Sheng,Jihui Huang,Zhenfeng Lin,Yongfu Guo. Difficulties and measures for upgrading and reconstruction of urban sewage treatment plants under quasi-Ⅳ standard [J]. Industrial Water Treatment, 2020, 40(11): 15-21.
[11]	Guo Chen,Yang Song,Jing Qu. Discussion on sewage treatment plant upgrading and reconstruction of petrochemical industry [J]. Industrial Water Treatment, 2019, 39(7): 10-13.
[12]	Lei Xiao,Kan Luo,Jinfeng He,Yi Yang,Jie Tang,Bei Xu. Pilot study on upgrading of salification city sewage treatment plant by A/O+MBR process [J]. Industrial Water Treatment, 2019, 39(11): 70-72.
[13]	Jun Cao, Yimin Pang. Application of modified two-stage activated sludge process in upgrading and reconstruction of wastewater treatment plant [J]. Industrial Water Treatment, 2019, 39(10): 107-110.
[14]	Li Rong, Wang Haiwei, Liu Kai. Engineering design of the upgrading and reconstruction of WWTP No.1 in Xi'an City [J]. INDUSTRIAL WATER TREATMENT, 2016, 36(11): 96-99.

Please choose a citation manager

Content to export