Influence of flow distribution ratio on the removal of improved multi-stage A/O pollutants

doi:10.16085/j.issn.1000-6613.2020-1407

Abstract

Abstract:

Aiming at the problem that the traditional multi-stage A/O process has lower carbon and nitrogen removal efficiency than domestic sewage, the multi-stage A/O process is improved by adding a pre-anaerobic section. This experiment focuses on the effect of flow distribution ratio on the removal of nitrogen and phosphorus from domestic sewage with a low carbon to nitrogen ratio. When the temperature of the system is (22±4)℃, the hydraulic retention time is 8h, the sludge age is 14d, the activated sludge concentration is 2—3g/L, and the sludge return ratio is 75%, the system is in turn at 100%∶0∶0, 45%∶30%∶25%, 60%∶30%∶10% three flow distribution ratios of continuous operation for 47 days. The results showed that under the influent ratio of 45%∶30%∶25%, the removal effect of COD and ammonia nitrogen was the best, the removal rate reached 90.24% and 96.66%, and the effluent concentration was 30.97mg/L and 2.11mg/L, respectively. It is better than the first Level A discharge standard of GB 18918—2002 "Emission Standard of Pollutants for Urban Wastewater Treatment Plants". Under the three flow distribution ratios, the overall removal effect of the system on TN and TP is average, with an average removal rate of 47.31% and 49.33%. The addition of carbon sources can enhance denitrification and chemical phosphorus removal to further reduce the nitrogen and phosphorus effluent concentration. The effluent is expected to reach one Grade B standard. The improved process basically realizes the removal of nitrogen and phosphorus on the basis of ensuring the removal 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, nitrogen and phosphorus removal, flow distribution ratio, environment

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，本文通过增设前置厌氧段改良多级A/O工艺，重点研究了流量分配比对低碳氮比生活污水脱氮除磷的影响。系统在温度为(22±4)℃、水力停留时间为8h、污泥龄为14d、活性污泥浓度为2～3g/L、污泥回流比为75%时，系统依次在100%∶0∶0、45%∶30%∶25%、60%∶30%∶10%三种流量分配比下连续运行47d。结果表明，在45%∶30%∶25%的进水比下，COD、氨氮去除效果最佳，去除率分别达到90.24%和96.66%，出水浓度分别为30.97mg/L、2.11mg/L，均优于GB18918—2002《城镇污水处理厂污染物排放标准》一级A排放标准。三种流量分配比下系统对TN、TP总体去除效果一般，平均去除率为47.31%、49.33%，可通过外加碳源增强反硝化作用及化学除磷进一步降低氮磷出水浓度，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, 脱氮除磷, 流量分配比, 环境

CLC Number:

X703

Rui MIN, Guozhen ZHANG, Fuping WU, Ju MING, Yu KANG, Wanhong WANG. Influence of flow distribution ratio on the removal of improved multi-stage A/O pollutants[J]. Chemical Industry and Engineering Progress, 2020, 39(S2): 421-426.

闵芮, 张国珍, 武福平, 明驹, 亢瑜, 王万红. 流量分配比对改良多级A/O污染物的去除影响[J]. 化工进展, 2020, 39(S2): 421-426.

Figures/Tables 13

References 15

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项目	COD/mg·L^-1	氨氮/mg·L^-1	TN/mg·L^-1	TP/mg·L^-1	pH
范围	233.28～452.25	38.70～87.92	40.21～89.00	4.15～7.39	7.35～7.70
均值	270.38	61.83	63.53	5.15	7.58

项目	COD/mg·L^-1	氨氮/mg·L^-1	TN/mg·L^-1	TP/mg·L^-1	pH
范围	233.28～452.25	38.70～87.92	40.21～89.00	4.15～7.39	7.35～7.70
均值	270.38	61.83	63.53	5.15	7.58

指标	分析检测方法
COD	快速消解分光光度法
TP	钼锑抗分光光度法
氨氮	纳氏试剂分光光度法
TN	过硫酸钾消解-紫外分光光度法
亚硝酸盐氮	N-(1-萘基)-乙二胺分光光度法
硝酸盐氮	麝香草酚分光光度法
SV	量筒静置法
MLSS	重量法

指标	分析检测方法
COD	快速消解分光光度法
TP	钼锑抗分光光度法
氨氮	纳氏试剂分光光度法
TN	过硫酸钾消解-紫外分光光度法
亚硝酸盐氮	N-(1-萘基)-乙二胺分光光度法
硝酸盐氮	麝香草酚分光光度法
SV	量筒静置法
MLSS	重量法

污染物	流量分配比	反应器进出水浓度/mg·L^-1
污染物	流量分配比	A₀	A₁	O₁	A₂	O₂	A₃	O₃
COD	100%∶0∶0	212.64	87.29	46.66	38.00	38.16	34.62	34.64
		87.29	46.66	38.00	38.16	34.62	34.64	34.62
	45%∶35%∶25%	141.47	108.36	60.20	91.20	52.68	80.20	48.16
		108.36	60.20	39.13	52.68	43.65	48.16	46.66
	60%∶30%∶10%	120.08	79.77	45.15	75.68	57.19	60.42	48.00
		79.77	45.15	39.66	57.19	49.67	48.00	42.50
氨氮	100%∶0∶0	43.10	24.09	7.66	3.45	3.00	2.40	3.85
		24.10	7.66	3.45	3.00	2.40	3.85	4.00
	45%∶35%∶25%	25.64	16.63	6.54	13.66	10.53	10.15	8.25
		16.63	6.54	0.96	10.53	1.10	8.25	2.53
	60%∶30%∶10%	23.44	15.66	4.98	9.28	7.87	2.92	2.48
		15.66	4.98	0.00	7.87	0.00	2.48	0.94
TN	100%∶0∶0	43.10	24.09	7.66	3.45	3.00	2.40	3.85
		24.09	7.66	3.45	3.00	2.40	3.85	4.00
	45%∶35%∶25%	25.64	16.63	6.54	13.66	10.53	10.15	8.25
		16.63	6.54	0.96	10.53	1.10	8.25	2.53
	60%∶30%∶10%	23.44	15.66	4.98	9.28	7.87	2.92	2.48
		15.66	4.98	0.00	7.87	0.00	2.48	0.94
TP	100%∶0∶0	4.13	19.51	8.89	6.13	3.10	2.26	1.98
		19.51	8.89	6.13	3.10	2.26	1.98	1.50
	45%∶35%∶25%	4.73	7.95	4.98	4.87	4.09	4.17	3.74
		7.95	4.98	4.40	4.09	3.74	3.74	3.63
	60%∶30% ∶10%	3.49	3.05	2.58	3.08	2.89	2.74	2.70
		3.05	2.58	2.74	2.89	2.62	2.70	2.55