Design and application of nitrogen and phosphorus interception project in agricultural non-point source pollution

doi:10.16178/j.issn.0528-9017.20230415

Abstract

Abstract:

In view of agricultural non-point source pollution in rural pastoral ecosystem, a “new farmland ecological nitrogen and phosphorus interception system” is constructed by comprehensively transforming the existing agricultural irrigation ditches, constructing nitrogen and phosphorus interception ditches, ecological permeable dam, denitrification and phosphorus removal modules, etc. After the system was completed and operated steadily, the overall effluent water quality remained stable at or above the surface Class Ⅳ water, among which the chemical oxygen demand was reduced by 35.0%, ammonia nitrogen was reduced by 44.6%, and total phosphorus was reduced by 29.5%, effectively reducing the discharge of nitrogen and phosphorus pollutants in the region. The system has low investment cost and high efficiency, and has broad application prospects in similar ditch reconstruction projects.

Key words: agricultural non-point source pollution, nitrogen and phosphorus interception ditch, ecological permeable dam, denitrification and phosphorus removal

CLC Number:

X524

HE Fan, XU Chao, LIN Yudi, ZHOU Ting, YAN Chenyu, ZHANG Rongbing, JIA Hongbai. Design and application of nitrogen and phosphorus interception project in agricultural non-point source pollution[J]. Journal of Zhejiang Agricultural Sciences, 2024, 65(7): 1714-1719.

Figures/Tables 7

Fig.1 Aerial photo of the project site

Fig.2 Profile of original ditch renovation

Fig.3 Section diagram of newly constructed nitrogen and phosphorus interception ditch

Fig.4 Section diagram of denitrification and phosphorus removal device

Fig.5 Section diagram of ecological permeable dam

Table 1 Detection data of outlet water at the end of the ditch

序号	检测日期	检测项目	出水浓度/ (mg·L^-1)	去除率/ %
1	2022-11-30	COD	26.00	35.2
		氨氮	1.06	47.5
		总磷	0.29	27.5
2	2022-12-25	COD	26.00	35.4
		氨氮	1.11	44.0
		总磷	0.28	29.2
3	2023-01-29	COD	24.00	39.4
		氨氮	1.12	43.2
		总磷	0.27	31.5
4	2023-02-20	COD	28.00	31.2
		氨氮	1.13	43.5
		总磷	0.29	28.3
5	2023-03-27	COD	26.00	33.8
		氨氮	1.12	44.8
		总磷	0.28	31.0

Fig.6 Comparison before and after ditch treatment

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