A2/O-BAF工艺短程硝化模式下反硝化除磷效能

doi:10.16085/j.issn.1000-6613.2022-0686

化工进展 ›› 2023, Vol. 42 ›› Issue (2): 1089-1097.DOI: 10.16085/j.issn.1000-6613.2022-0686

A²/O-BAF工艺短程硝化模式下反硝化除磷效能

吴新波¹^,²^,³(), 党鸿钟¹^,²^,³, 马娇¹^,²^,³, 严渊¹^,²^,³, 曾天续¹^,²^,³, 李维维¹^,²^,³^,⁴, 张国珍¹^,²^,³, 陈永志¹^,²^,³()

^1.甘肃省黄河水环境重点实验室，甘肃兰州 730070
^2.兰州交通大学环境与市政工程学院，甘肃兰州 730070
^3.甘肃省污水处理行业技术中心，甘肃兰州 730070
^4.甘肃省轻工研究院有限责任公司，甘肃兰州 730070

收稿日期:2022-04-18 修回日期:2022-05-08 出版日期:2023-02-25 发布日期:2023-03-13
通讯作者: 陈永志
作者简介:吴新波（1995—），男，硕士研究生，研究方向为污（废）水处理理论与技术。E-mail：1064106187@qq.com。
基金资助:
兰州交通大学甘肃省黄河水环境重点实验室开放课题(20JR2RA002);甘肃省高等学校产业支撑计划(2020C-38);兰州交通大学天佑创新团队项目(TY202005);甘肃省青年科技基金计划(20JR5RA075)

Effect of denitrifying phosphorus removal under short-cut nitrification mode with A²/O-BAF process

WU Xinbo¹^,²^,³(), DANG Hongzhong¹^,²^,³, MA Jiao¹^,²^,³, YAN Yuan¹^,²^,³, ZENG Tianxu¹^,²^,³, LI Weiwei¹^,²^,³^,⁴, ZHANG Guozhen¹^,²^,³, CHEN Yongzhi¹^,²^,³()

^1.Key Laboratory of Yellow River Water Environment in Gansu Province, Lanzhou 730070, Gansu, China
^2.School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China
^3.Technical Center of Sewage Treatment Industry in Gansu Province, Lanzhou 730070, Gansu, China
^4.Gansu Research Institute of Light Industry Co. , Ltd. , Lanzhou 730070, Gansu, China

Received:2022-04-18 Revised:2022-05-08 Online:2023-02-25 Published:2023-03-13
Contact: CHEN Yongzhi

摘要/Abstract

摘要：

采用厌氧/缺氧/好氧-曝气生物滤池（A²/O-BAF）工艺处理低C/N城市污水，研究硝化液回流比为0、50%、100%、150%和200%时该工艺脱氮除磷效能。结果表明，在A²/O中控制污泥龄（SRT）为15d，水力停留时间（HRT）为10h，好氧段溶解氧（DO）为2.0mg/L；BAF中控制HRT为3h、好氧/缺氧曝停时间比为50min∶10min以及硝化液回流比R=200%的条件下，进水COD、TN、NH₄⁺-N和PO₄^3--P的浓度分别为232.61mg/L、53.99mg/L、52.20mg/L和5.54mg/L，系统出水中COD、TN、NH₄⁺-N和PO₄^3--P的浓度分别为34.11mg/L、12.44mg/L、1.01mg/L和0.34mg/L，亚硝积累率（NiAR）高达95.20%。出水NO₂^--N回流至A²/O缺氧段后，缺氧段出水的PO₄^3--P含量下降至2.68mg/L，反硝化除磷（DPR）对系统PO₄^3--P的去除贡献达75.42%。批次试验表明，A²/O反应器中的除磷菌在厌氧120min后释磷量达到36.35mg/L，缺氧条件下以NO₂^--N为电子受体的反应中吸磷量为26.28mg/L，吸磷率为72.30%，以NO₂^--N为电子受体的反硝化除磷菌（DPB）占总除磷菌的72.91%。

关键词: 厌氧/缺氧/好氧-曝气生物滤池, 短程硝化, 反硝化除磷, 硝化液回流比, 脱氮除磷

Abstract:

The anaerobic/anoxic/aerobic-aerated biological filter (A²/O-BAF) process was used to treat low-C/N municipal sewage, the nitrogen and phosphorus removal efficiency of the process was studied when the reflux ratio of nitrification solution was 0, 50%, 100%, 150% and 200%. The results showed that when A²/O operated with the sludge retention time (SRT) being 15d, the hydraulic retention time (HRT) being 10h, and the dissolved oxygen (DO) in the aerobic stage being 2.0mg/L, BAF operated under the conditions of HRT of 3h, aerobic/anoxic exposure time ratio of 50min∶10min, and nitrification solution reflux ratio R of 200%, and the concentrations of COD, TN, NH₄⁺-N and PO₄^3--P in the influent were 232.61mg/L, 53.99mg/L, 52.20mg/L and 5.54mg/L, respectively, the concentrations of COD, TN, NH₄⁺-N and PO₄^3--P in the effluent of the system were 34.11mg/L, 12.44mg/L, 1.01mg/L and 0.34mg/L, respectively, and the nitrite accumulation rate (NiAR) was as high as 95.20%. After the effluent NO₂^--N returned to the A²/O anoxic section, the PO₄^3--P content of the effluent in the anoxic section dropped to 2.68mg/L, denitrifying phosphorus removal (DPR) contributed 75.42% to the removal of PO₄^3--P in the system. Batch tests showed that the phosphorus release of phosphorus removal bacteria in A²/O reactor reached 36.35mg/L after anaerobic treatment for 120min. Under anoxic conditions, the amount of phosphorus absorbed in the reaction with NO₂^--N as electron acceptor was 26.28mg/L, and the phosphorus absorption rate was 72.30%. Denitrifying phosphorus removal bacteria (DPB) with NO₂^--N as electron acceptor accounted for 72.91% of the total phosphorus removal bacteria.

Key words: anaerobic/anoxic/oxic-biological aerated filter (A²/O-BAF), short-cut nitrification, denitrifying phosphorus removal (DPR), reflux ratio of nitrifying liquid, denitrification and phosphorus removal

中图分类号:

X703

吴新波, 党鸿钟, 马娇, 严渊, 曾天续, 李维维, 张国珍, 陈永志. A²/O-BAF工艺短程硝化模式下反硝化除磷效能[J]. 化工进展, 2023, 42(2): 1089-1097.

WU Xinbo, DANG Hongzhong, MA Jiao, YAN Yuan, ZENG Tianxu, LI Weiwei, ZHANG Guozhen, CHEN Yongzhi. Effect of denitrifying phosphorus removal under short-cut nitrification mode with A²/O-BAF process[J]. Chemical Industry and Engineering Progress, 2023, 42(2): 1089-1097.

图/表 10

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名称	控制条件	反应容积	主要功能
A²/O
A1、A2	厌氧	12L	厌氧释磷、去除COD
A3~A8	缺氧	36L	反硝化除磷
O1、O2	好氧	12L	好氧吸磷、吹脱氮气
BAF	好氧/缺氧	18L	短程硝化

名称	控制条件	反应容积	主要功能
A²/O
A1、A2	厌氧	12L	厌氧释磷、去除COD
A3~A8	缺氧	36L	反硝化除磷
O1、O2	好氧	12L	好氧吸磷、吹脱氮气
BAF	好氧/缺氧	18L	短程硝化

项目	数值	项目	数值
COD/mg·L^-1	0	FeCl₃·6H₂O/g·L^-1	0.03
NH₄⁺-N/mg·L^-1	99~102	MgSO₄/g·L^-1	0.09
NO₂^--N/mg·L^-1	0.09~0.22	MnCl₂/g·L^-1	0.24
NO₃^--N/mg·L^-1	0.31~0.44	NiCl₂/g·L^-1	0.06
pH	7.5~8.0	Na₂MoO₄/g·L^-1	0.06

项目	数值	项目	数值
COD/mg·L^-1	0	FeCl₃·6H₂O/g·L^-1	0.03
NH₄⁺-N/mg·L^-1	99~102	MgSO₄/g·L^-1	0.09
NO₂^--N/mg·L^-1	0.09~0.22	MnCl₂/g·L^-1	0.24
NO₃^--N/mg·L^-1	0.31~0.44	NiCl₂/g·L^-1	0.06
pH	7.5~8.0	Na₂MoO₄/g·L^-1	0.06

阶段	运行时间/d	A²/O				BAF
阶段	运行时间/d	HRT/h	SRT/d	好氧段DO/mg·L^-1	污泥回流比r/%	HRT/h	好氧/缺氧曝停比	曝气量/L·h^-1	DO/mg·L^-1
BAF启动阶段	1~15	—	—	—	—	12	20/40	60	1.5
A²/O-BAF稳定运行
R=0	16~30	20	15	2.0	100	6	20/40	60	1.0~1.2
R=50%	31~45	20	15	2.0	100	6	30/30	80	2.5
R=100%	46~60	10	15	2.0	100	3	40/20	80	2.5
R=150%	61~75	10	15	2.0	100	3	40/20	100	3.5
R=200%	76~90	10	15	2.0	100	3	50/10	80	3.5

A²/O-BAF工艺短程硝化模式下反硝化除磷效能

Effect of denitrifying phosphorus removal under short-cut nitrification mode with A²/O-BAF process

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