改良多级A/O对低C/N生活污水强化除磷效果研究

doi:10.16085/j.issn.1000-6613.2020-0949

化工进展 ›› 2020, Vol. 39 ›› Issue (S2): 379-384.DOI: 10.16085/j.issn.1000-6613.2020-0949

改良多级A/O对低C/N生活污水强化除磷效果研究

王宏伟¹^,²(), 张国珍¹^,²^,³(), 武福平¹^,², 明驹⁴, 闵芮¹^,², 严婉铒¹^,², 程锦¹^,²

^1.兰州交通大学环境与市政工程学院，甘肃兰州 730070
^2.甘肃省黄河水环境重点实验室，甘肃兰州 730070
^3.寒旱地区水资源综合利用教育部工程研究中心，甘肃兰州 730070
^4.武汉地铁集团有限公司，湖北武汉 430000

收稿日期:2020-05-29 出版日期:2020-11-20 发布日期:2020-11-17
通讯作者: 张国珍
作者简介:王宏伟（1994—），男，硕士研究生，研究方向为水处理理论与技术。E-mail：whw1108lju@163.com。
基金资助:
国家自然科学基金(51768031);兰州交通大学青年基金(2019012);甘肃省非常规水资源化利用技术重点实验室开放课题(UWKL-1903)

Study on enhanced phosphorus removal effect of improved multi-stage A/O on low C/N domestic sewage

Hongwei WANG¹^,²(), Guozhen ZHANG¹^,²^,³(), Fuping WU¹^,², Ju MING⁴, Rui MIN¹^,², Wan’er YAN¹^,², Jin CHENG¹^,²

^1.School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China
^2.Key laboratory of Yellow River Water Environment in Gansu Province, Lanzhou 730070, Gansu, China
^3.Engineering Research Center for Comprehensive Utilization of Water Resource in Cold and Arid Regions of Ministry of Education, Lanzhou 730070, Gansu, China
^4.Wuhan Metro Group Co. , Ltd. , Wuhan 430000, Hubei, China

Received:2020-05-29 Online:2020-11-20 Published:2020-11-17
Contact: Guozhen ZHANG

摘要/Abstract

摘要：

针对传统多级A/O工艺处理低碳氮比生活污水除磷效果差的问题，通过增设前置厌氧段改良多级A/O工艺，重点研究了除磷效果的可行性。结果表明：在温度为17℃±3℃、流量分配比为100%∶0∶0、水力停留时间为10h、污泥回流比为50%、污泥龄为14天的条件下，系统总体除磷效果较好。其中COD、TP平均去除率分别为89.81%、90.35%，出水平均浓度分别为32.65mg/L、0.49mg/L，均优于GB 18918—2002《城镇污水处理厂污染物排放标准》一级A排放标准。由于受到硝化反硝化的综合影响，对污水中含有的氮素去除效果一般，其中NH₃-N、TN去除率均为50%左右，出水平均浓度为30.32mg/L、30.41mg/L，可通过外加碳源的方式增强反硝化能力，进一步提高系统脱氮效果，出水有望达到一级B标准。改良工艺在保证有机物去除效果的基础上基本实现了脱氮除磷，可为实际生活中处理低C/N生活污水提供参考。

关键词: 改良多级A/O, 低碳氮比, 生活污水, 强化除磷, 环境

Abstract:

The problem is that the traditional multi-stage A/O process is inferior to the phosphorus removal effect of low-carbon nitrogen and domestic sewage, by adding a pre-anaerobic section to improve the multi-stage A/O process, the feasibility of the phosphorus removal effect was mainly studied. The results show that under the conditions of temperature 17℃±3℃, flow distribution ratio of 100%∶0∶0, hydraulic retention time of 10h, sludge return ratio of 50%, and sludge age of 14d, the system of the overall phosphorus removal effect is better. Among them, the average removal rates of COD and TP were 89.81% and 90.35%, and the average effluent concentrations were 32.65mg/L and 0.49mg/L, which were better than Grade A of GB 18918—2002 "Emission Standards for Pollutants of Urban Wastewater Treatment Plants" Emission Standards. Due to the comprehensive influence of nitrification and denitrification, the removal effect of nitrogen in sewage is general. The removal rate of NH₃-N and TN is about 50%, and the average concentration of effluent is 30.32mg/L and 30.41mg/L. By adding a carbon source, the denitrification capacity is enhanced to further improve the denitrification effect of the system, and the effluent is expected to reach Class B standards. The improved process basically realizes the removal of nitrogen and phosphorus on the basis of ensuring the removal effect of organic matter, which can provide a reference for the treatment of low C/N domestic sewage in actual life.

Key words: improved multi-stage A/O, low carbon nitrogen ratio, domestic sewage, enhanced phosphorus removal, environment

中图分类号:

X703

王宏伟, 张国珍, 武福平, 明驹, 闵芮, 严婉铒, 程锦. 改良多级A/O对低C/N生活污水强化除磷效果研究[J]. 化工进展, 2020, 39(S2): 379-384.

Hongwei WANG, Guozhen ZHANG, Fuping WU, Ju MING, Rui MIN, Wan’er YAN, Jin CHENG. Study on enhanced phosphorus removal effect of improved multi-stage A/O on low C/N domestic sewage[J]. Chemical Industry and Engineering Progress, 2020, 39(S2): 379-384.

图/表 12

图1 实验装置示意图

表1 原水水质

COD/mg·L^-1	氨氮/mg·L^-1	TN/mg·L^-1	TP/mg·L^-1	pH	温度/℃
233.28～ 424.41	42.51～ 74.55	42.89～ 75.04	4.23～ 6.91	7.44～ 7.90	16.90～ 23.00
293.10	59.55	59.93	5.14	7.68	18

表2 监测指标及方法

编号	监测项目	监测方法
1	COD	快速消解分光光度法
2	NH₄⁺-N	纳氏分光光度法
3	TN	过硫酸钾氧化-紫外分光光度法
4	TP	钼酸铵分光光度法
5	NO₃^--N	麝香草酚分光光度法
6	NO₂^--N	采用N-(1-萘基)-乙二胺光度法
7	DO	溶解氧仪
8	pH	pH计

图2 强化除磷工艺对COD去除效果

图3 强化除磷工艺沿程COD变化情况

图4 强化除磷工艺对总磷去除效果

图5 强化除磷工艺沿程PO43--P变化情况

图6 强化除磷工艺对氨氮去除效果

图7 强化除磷工艺沿程氨氮变化情况

图8 强化除磷工艺对总氮去除效果

图9 强化除磷工艺沿程总氮浓度变化情况

图10 强化除磷工艺沿程硝酸盐氮及亚硝酸盐氮浓度变化情况

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改良多级A/O对低C/N生活污水强化除磷效果研究

Study on enhanced phosphorus removal effect of improved multi-stage A/O on low C/N domestic sewage

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