Effect analysis of deep removal of nitrogen and phosphorus by A/A/O micro-aeration oxidation ditch process in a municipal wastewater treatment plant in Shenzhen, China
WANG Jia1,2, RONG Hongwei2,,, XIAO Guanxun1, YU Zishu1 1.Shenzhen Shenshui Longgang Wastewater Treatment Co. Ltd., Shenzhen 518116, China 2.School of Civil Engineering, Guangzhou University, Guangzhou 510006, China
Abstract:In order to investigate the performance of A/A/O micro-aeration oxidation ditch process on deep nitrogen and phosphorus removal, based on the long-term monitoring data of a municipal wastewater treatment plant in Shenzhen, the concentration of influent pollutants, the performance of nitrogen and phosphorus removal along the A/A/O, and the biological phase were analyzed. The results showed the general biochemical properties for the influent, and feasible biological nitrogen removal effect, while the limited biological phosphorus removal effect. This indicated that the chemical phosphorus removal was needed to enhance the phosphorus removal effect. There are negative correlation between concentration of PAFC dosage and the BOD5/TP of influent. The ammonia oxidation rate and nitrite oxidation rate of the microorganisms in the aerobic section of A/A/O could meet the normal progress of the nitrification reaction. However, the low denitrification rate in the anoxic section of A/A/O was a limiting factor for biological denitrification. The denitrification rate of the microorganism could be enhanced by reducing the internal return DO and increasing alkalinity in this anoxic section. There were a large number of epistylis, vorticellas, aspidiscas and rotifers in the biological pool, and lots of bacterial micelles at the mature stage with compact strucuture. The removal rates of TP and SS by deep treatment process could reach 60.3% and 33.71%, respectively. Through the material balance analysis, the assimilated nitrogen content and denitrified nitrogen content accounted for 43% and 57%, respectively. The percent of phosphorus removed by microbial uptake and adsorption was 49.06%, and the percent of phosphorus formed as chemical precipitate of phosphorus and PAFC was 50.94%. The case provides ideas for deep nitrogen and phosphorus removal in municipal wastewater treatment plant, and provides reference for improving effluent water quality standards. Key words:municipal wastewater treatment/ A/A/O micro-aeration oxidation ditch process/ nitrogen and phosphorus removal/ biological phase/ mass balance.
图1深圳市某水质净化厂工艺流程 Figure1.Schematic diagram of a municipal wastewater treatment plant in Shenzhen
图32018年1—12月某水质净化厂BOD5/TP值与除磷药剂投加浓度 Figure3.BOD5/TP and PAFC dosing concentration in the municipal wastewater treatment plant from January to December, 2018
表12018年1—12月某水质净化厂进水水量与污染物浓度 Table1.Wastewater inflow and pollutant concentration in the municipal wastewater treatment plantfrom January to December, 2018
月份
水量/(104 m3)
COD/(mg·L?1)
BOD5/(mg·L?1)
NH4+-N/(mg·L?1)
TN/(mg·L?1)
TP/(mg·L?1)
BOD5/COD
BOD5/TN
BOD5/TP
1
10.62
308.5
111.1
19.3
28.3
4.59
0.36
3.93
24.20
2
8.90
287.6
94.9
17.6
25.7
4.18
0.33
3.69
22.70
3
11.34
338.3
109.4
20
29.2
5.82
0.32
3.74
18.80
4
11.42
228.2
78.1
20.9
29.9
5.11
0.34
2.61
15.28
5
13.32
216.1
72.6
16.5
27.1
4.18
0.34
2.67
17.37
6
20.02
131.4
46.2
23.1
31.5
2.86
0.35
1.46
16.15
7
22.16
155.7
45.3
12.4
19.2
3.27
0.29
2.35
13.85
8
20.09
136.2
33.6
10.1
15.9
2.66
0.25
2.11
12.63
9
18.24
104.9
25.9
10.9
14.2
1.61
0.25
1.82
16.09
10
16.52
178.4
56.1
17.1
21.7
3.76
0.31
2.58
14.92
11
16.63
167.2
47.2
16.7
23.4
3.39
0.28
2.01
13.92
12
17.54
153.1
54
17.3
24.3
2.78
0.35
2.22
19.42
月份
水量/(104 m3)
COD/(mg·L?1)
BOD5/(mg·L?1)
NH4+-N/(mg·L?1)
TN/(mg·L?1)
TP/(mg·L?1)
BOD5/COD
BOD5/TN
BOD5/TP
1
10.62
308.5
111.1
19.3
28.3
4.59
0.36
3.93
24.20
2
8.90
287.6
94.9
17.6
25.7
4.18
0.33
3.69
22.70
3
11.34
338.3
109.4
20
29.2
5.82
0.32
3.74
18.80
4
11.42
228.2
78.1
20.9
29.9
5.11
0.34
2.61
15.28
5
13.32
216.1
72.6
16.5
27.1
4.18
0.34
2.67
17.37
6
20.02
131.4
46.2
23.1
31.5
2.86
0.35
1.46
16.15
7
22.16
155.7
45.3
12.4
19.2
3.27
0.29
2.35
13.85
8
20.09
136.2
33.6
10.1
15.9
2.66
0.25
2.11
12.63
9
18.24
104.9
25.9
10.9
14.2
1.61
0.25
1.82
16.09
10
16.52
178.4
56.1
17.1
21.7
3.76
0.31
2.58
14.92
11
16.63
167.2
47.2
16.7
23.4
3.39
0.28
2.01
13.92
12
17.54
153.1
54
17.3
24.3
2.78
0.35
2.22
19.42
下载: 导出CSV 表22018年1—12月某水质净化厂出水水质 Table2.Analysis of effluent quality in the municipal wastewater treatment plant from January to December, 2018 mg·L?1
月份
COD
BOD
NH4+-N
TN
TP
1
21.73
3.50
0.68
12.60
0.33
2
17.19
3.51
0.63
11.83
0.29
3
19.33
2.83
0.46
12.91
0.34
4
19.90
2.52
0.54
11.82
0.27
5
15.44
2.31
0.36
12.00
0.26
6
13.41
2.33
1.00
14.90
0.17
7
14.28
2.18
0.14
7.27
0.21
8
14.42
2.03
0.20
6.37
0.20
9
13.84
2.19
0.17
6.32
0.14
10
17.51
2.13
0.16
9.30
0.26
11
15.62
2.32
0.27
11.10
0.25
12
14.45
2.18
0.23
10.27
0.28
月份
COD
BOD
NH4+-N
TN
TP
1
21.73
3.50
0.68
12.60
0.33
2
17.19
3.51
0.63
11.83
0.29
3
19.33
2.83
0.46
12.91
0.34
4
19.90
2.52
0.54
11.82
0.27
5
15.44
2.31
0.36
12.00
0.26
6
13.41
2.33
1.00
14.90
0.17
7
14.28
2.18
0.14
7.27
0.21
8
14.42
2.03
0.20
6.37
0.20
9
13.84
2.19
0.17
6.32
0.14
10
17.51
2.13
0.16
9.30
0.26
11
15.62
2.32
0.27
11.10
0.25
12
14.45
2.18
0.23
10.27
0.28
下载: 导出CSV 表3二级出水和深度出水水质 Table3.Effluent quality of secondary and advanced treatment processes mg·L?1
POGNANI M, BARRENA R, FONT X, et al. A complete massbalance of a complex combined anaerobic/aerobic municipal source-separated waste treatment plant[J]. Bioresource Technology, 2011, 102(7): 4646-4653.
Effect analysis of deep removal of nitrogen and phosphorus by A/A/O micro-aeration oxidation ditch process in a municipal wastewater treatment plant in Shenzhen, China
1.Shenzhen Shenshui Longgang Wastewater Treatment Co. Ltd., Shenzhen 518116, China 2.School of Civil Engineering, Guangzhou University, Guangzhou 510006, China Received Date: 2019-11-29 Accepted Date: 2020-03-19 Available Online: 2020-10-14 Keywords:municipal wastewater treatment/ A/A/O micro-aeration oxidation ditch process/ nitrogen and phosphorus removal/ biological phase/ mass balance Abstract:In order to investigate the performance of A/A/O micro-aeration oxidation ditch process on deep nitrogen and phosphorus removal, based on the long-term monitoring data of a municipal wastewater treatment plant in Shenzhen, the concentration of influent pollutants, the performance of nitrogen and phosphorus removal along the A/A/O, and the biological phase were analyzed. The results showed the general biochemical properties for the influent, and feasible biological nitrogen removal effect, while the limited biological phosphorus removal effect. This indicated that the chemical phosphorus removal was needed to enhance the phosphorus removal effect. There are negative correlation between concentration of PAFC dosage and the BOD5/TP of influent. The ammonia oxidation rate and nitrite oxidation rate of the microorganisms in the aerobic section of A/A/O could meet the normal progress of the nitrification reaction. However, the low denitrification rate in the anoxic section of A/A/O was a limiting factor for biological denitrification. The denitrification rate of the microorganism could be enhanced by reducing the internal return DO and increasing alkalinity in this anoxic section. There were a large number of epistylis, vorticellas, aspidiscas and rotifers in the biological pool, and lots of bacterial micelles at the mature stage with compact strucuture. The removal rates of TP and SS by deep treatment process could reach 60.3% and 33.71%, respectively. Through the material balance analysis, the assimilated nitrogen content and denitrified nitrogen content accounted for 43% and 57%, respectively. The percent of phosphorus removed by microbial uptake and adsorption was 49.06%, and the percent of phosphorus formed as chemical precipitate of phosphorus and PAFC was 50.94%. The case provides ideas for deep nitrogen and phosphorus removal in municipal wastewater treatment plant, and provides reference for improving effluent water quality standards.
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