Pilot scale of treatment of secondary effluent from sewage plant by three-dimensional electrode oxidation

doi:10.19965/j.cnki.iwt.2022-0910

Abstract

Abstract:

The secondary effluent of sewage treatment plant can be used as the source of reclaimed water，and the containing refractory organic matter has been concerned. In order to explore the treatment effect of electrocatalytic oxidation technology on the refractory organic matter in the secondary effluent of the actual sewage treatment plant，a continuous flow pilot scale reaction device was adopted. Using COD and ammonia nitrogen as the main inspection indicators，combined with changes in total nitrogen and total phosphorus，the treatment efficiency of different operating conditions and two-dimensional and three-dimensional electrocatalytic oxidation systems was compared through three-dimensional fluorescence spectrum analysis. The results showed that the optimal removal conditions of refractory COD were as follows：ruthenium titanium graphite electrode，current density 4 mA/cm²，electrode plate spacing 4 cm，influent flow 200 L/ h. The primary and secondary influencing factors followed：electrode plate material，hydraulic retention time，current density，electrode plate spacing. Under the optimum parameters of refractory COD，the average removal rate of COD and ammonia nitrogen was 82.5% and 51.59%，respectively. Compared with the two-dimensional electrocatalytic oxidation system，the three-dimensional electrocatalytic oxidation system increased the COD removal rate by 20%，the ammonia nitrogen removal rate by 25% and the energy consumption by 17%. Three-dimensional fluorescence spectrum analysis results indicated this method could effectively deal with humic acid and fulvic acid substances.

Key words: electrocatalytic oxidation, three-dimensional electrode system, secondary effluent, refractory organic pollutants, advanced treatment

摘要：

污水处理厂的二级出水可以作为再生水水源，其中所含的难降解有机物一直备受关注。为了探究电催化氧化技术对实际污水厂二级出水中难降解有机物的处理效果，采用了连续流的中试反应装置，以COD、氨氮为主要考察指标，结合总氮、总磷的变化，通过三维荧光图谱分析，对比了不同操作条件以及二维和三维电催化氧化体系的处理效能。结果表明：难降解COD优化去除条件为选用钌钛-石墨电极、电流密度4 mA/cm²、极板间距4 cm、进水流量200 L/h。主次影响因素为极板材料>水力停留时间>电流密度>极板间距。在优化参数条件下运行时，COD平均去除率为82.5%，氨氮平均去除率为51.59%；三维电催化氧化体系相比于二维电催化氧化体系COD去除率提升了20%，氨氮去除率提升了25%，能耗降低了17%；三维荧光光谱分析显示，该方法能够有效处理腐殖酸与富里酸类物质。

关键词: 电催化氧化, 三维电极体系, 二级出水, 难降解有机物, 深度处理

CLC Number:

X703.1

Zhaoyang LI, Qinglin YAO, Hao Zhang, Cheng LI, Yue GU, Shaopo WANG. Pilot scale of treatment of secondary effluent from sewage plant by three-dimensional electrode oxidation[J]. Industrial Water Treatment, 2023, 43(8): 159-164.

李兆阳, 姚庆林, 张浩, 李诚, 顾悦, 王少坡. 三维电极氧化处理污水厂二级出水中试研究[J]. 工业水处理, 2023, 43(8): 159-164.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2022-0910

https://www.iwt.cn/EN/Y2023/V43/I8/159

Figures/Tables 7

References 17

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水平	因素
水平	极板材料	电流密度/（mA·cm^-2）	极板间距/cm	进水流量/（L·h^-1）
1	钌钛-石墨	1	1	150
2	铝-石墨	2	2	200
3	钌铱-石墨	3	3	250
4	铱钽钛-石墨	4	4	300

水平	因素
水平	极板材料	电流密度/（mA·cm^-2）	极板间距/cm	进水流量/（L·h^-1）
1	钌钛-石墨	1	1	150
2	铝-石墨	2	2	200
3	钌铱-石墨	3	3	250
4	铱钽钛-石墨	4	4	300

实验组数	极板材料	电流密度/（mA·cm^-2）	极板间距/cm	进水流量/（L·h^-1）	空列	COD去除率/%
1	钌钛-石墨	1	1	300	1	23.69
2	钌钛-石墨	2	2	250	2	49.23
3	钌钛-石墨	3	3	200	3	57.45
4	钌钛-石墨	4	4	150	4	85.21
5	铝-石墨	1	3	250	4	18.38
6	铝-石墨	2	4	300	3	20.02
7	铝-石墨	3	1	150	2	34.45
8	铝-石墨	4	2	200	1	31.39
9	钌铱-石墨	1	4	200	2	29.80
10	钌铱-石墨	2	3	150	1	21.56
11	钌铱-石墨	3	2	300	4	45.00
12	钌铱-石墨	4	1	250	3	43.33
13	铱钽钛-石墨	1	2	150	3	43.33
14	铱钽钛-石墨	2	1	200	4	29.41
15	铱钽钛-石墨	3	4	250	1	31.62
16	铱钽钛-石墨	4	3	300	2	24.01
	K ₁	53.895	28.800	28.180	32.720	A ₁ B ₄ C ₄ D ₂
	K ₂	26.060	30.055	35.640	42.237
	K ₃	34.922	42.130	37.013	30.350
	K ₄	32.093	45.985	46.138	41.663
	R	27.835	17.185	17.958	11.887	A>C>B>D

实验组数	极板材料	电流密度/（mA·cm^-2）	极板间距/cm	进水流量/（L·h^-1）	空列	COD去除率/%
1	钌钛-石墨	1	1	300	1	23.69
2	钌钛-石墨	2	2	250	2	49.23
3	钌钛-石墨	3	3	200	3	57.45
4	钌钛-石墨	4	4	150	4	85.21
5	铝-石墨	1	3	250	4	18.38
6	铝-石墨	2	4	300	3	20.02
7	铝-石墨	3	1	150	2	34.45
8	铝-石墨	4	2	200	1	31.39
9	钌铱-石墨	1	4	200	2	29.80
10	钌铱-石墨	2	3	150	1	21.56
11	钌铱-石墨	3	2	300	4	45.00
12	钌铱-石墨	4	1	250	3	43.33
13	铱钽钛-石墨	1	2	150	3	43.33
14	铱钽钛-石墨	2	1	200	4	29.41
15	铱钽钛-石墨	3	4	250	1	31.62
16	铱钽钛-石墨	4	3	300	2	24.01
	K ₁	53.895	28.800	28.180	32.720	A ₁ B ₄ C ₄ D ₂
	K ₂	26.060	30.055	35.640	42.237
	K ₃	34.922	42.130	37.013	30.350
	K ₄	32.093	45.985	46.138	41.663
	R	27.835	17.185	17.958	11.887	A>C>B>D

活性炭投加质量浓度/（g·L^-1）	COD去除率/%	氨氮去除率/%	总磷去除率/%	总氮去除率/%
0	74.99	68.02	32.90	6.25
20	92.51	91.07	56.68	15.97
40	82.08	83.05	50.95	11.05
60	80.41	82.59	55.62	11.40

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