[1]吕利平,李航,张欣,等.多点进水对前置预缺氧A2/O工艺脱氮除磷的影响[J].中国给水排水,2021,37(15):8-13.
　Lü Li-ping,LI Hang,ZHANG Xin,et al.Effect of Step-feed on Nitrogen and Phosphorus Removal of Pre-anoxic A2/O Process[J].China Water & Wastewater,2021,37(15):8-13.
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多点进水对前置预缺氧A2/O工艺脱氮除磷的影响

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第37卷 期数: 2021年第15期 页码: 8-13 栏目: 出版日期: 2021-08-01
Title:
Effect of Step-feed on Nitrogen and Phosphorus Removal of Pre-anoxic A2/O Process
作者:
吕利平1,2，李航2,3，张欣3，周洋3
(1.长江师范学院化学化工学院，重庆408100；2.西南石油大学化学化工学院，四川成都610500；3.重庆市三峡水务渝北排水有限责任公司，重庆401120)
Author(s):
Lü Li-ping1,2,LI Hang2,3,ZHANG Xin3,ZHOU Yang3
(1. College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing 408100, China; 2. School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China; 3. Chongqing Three Gorges Water Yubei Drainage Co. Ltd., Chongqing 401120, China)
关键词:
A2/O工艺; 前置预缺氧; 多点进水; 流量分配比; 脱氮除磷; 碳源
Keywords:
A2/O process; pre-anoxic process; step-feed; flow distribution ratio; nitrogen and phosphorus removal; carbon source
摘要:
某城市污水处理厂采用前置预缺氧A2/O工艺，为了考察多点进水对该工艺脱氮除磷的影响，设置预缺氧池、厌氧池、缺氧池进水流量分配比分别为8 ∶1 ∶1、7 ∶1 ∶2、6 ∶1 ∶3、5 ∶1 ∶4、6 ∶2 ∶2、6 ∶3 ∶1。结果表明，进水流量分配比对处理过程中的硝态氮浓度以及出水总氮、总磷浓度具有显著影响，而对出水氨氮浓度影响较小；优化进水流量分配比能实现预缺氧池与缺氧池两个脱氮单元碳源的合理配置，实现总氮的高效去除，同时，能减弱高浓度硝态氮对厌氧释磷产生的抑制作用，为后续好氧阶段的过量吸磷提供强大动力。相比之下，较优的预缺氧池、厌氧池、缺氧池进水流量分配比为6 ∶2 ∶2，该工况下出水氨氮平均浓度为0.26 mg/L，总氮浓度为4.88～6.69 mg/L，总磷浓度在0.15 mg/L以下，出水水质显著优于国家一级A排放标准。与原工况相比，优化进水流量分配比后，全年可节省200余万元的碳源投加费用，且出水水质能实现更加稳定的控制，有效促进了水质与成本的双赢。
Abstract:
Effect of step-feed on nitrogen and phosphorus removal in the pre-anoxic A2/O process of an urban wastewater treatment plant was investigated. Influent flow distribution ratio of pre-anoxic tank, anaerobic tank and anoxic tank was set to be 8∶1∶1, 7∶1 ∶2, 6∶1∶3, 5∶1∶4, 6∶2∶2 and 6∶3∶1, respectively. The influent flow distribution ratio had significant effects on nitrate nitrogen in the treatment process and total nitrogen and total phosphorus in the effluent. However, it had little effect on ammonia nitrogen in the effluent. Optimization of the influent flow distribution ratio could achieve a rational allocation of carbon sources in the two denitrification units of pre-anoxic and anoxic tanks, and achieve efficient removal of total nitrogen. Meanwhile, it could also weaken the inhibition of high nitrate nitrogen on anaerobic phosphorus release, and significantly promote the subsequent excessive phosphorus absorption in the aerobic stage. Among the six different conditions, the optimal influent flow distribution ratio of pre-anoxic tank, anaerobic tank and anoxic tank was 6∶2∶2. Under this operating condition, the average ammonia nitrogen in the effluent was 0.26 mg/L, the total nitrogen was between 4.88 mg/L and 6.69 mg/L, and the total phosphorus was lower than 0.15 mg/L. The effluent quality was significantly better than the national first level A standard. Compared with the original operating condition, after optimizing the influent flow distribution ratio, the annual carbon source cost of more than 2 million yuan could be saved, and the effluent quality was more stable, which effectively promoted the win-win situation in water quality and operating cost.
更新日期/Last Update: 2021-08-01