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Analysis of the main body behaviour of non-point source pollution control based on multimodal game model

Li Xin, Shang Jie

Ecological Chemistry and Engineering. S

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2021

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Vol. 28, nr 4

563--579

EN

The issue of agricultural non-point source pollution has attracted the attention of the state and the masse. In the non-point source pollution control organizations which composed of the governments, farmers and fertiliser sellers, due to the characteristics of rational economic body, the phenomenon of ”market failure” and ”government failure” may occur in the process of non-point source pollution control. In this paper, the author applies game theory to analyse the main behaviour characteristics of the three main bodies, and constructs the incomplete information dynamic game model that the government, farmers and fertiliser sellers participate in. According to the results of the equilibrium solution of the Haysani Axiom model, it is found that the decisions made by the three bodies of the government, the fertiliser seller and the farmer in the behaviour choice stage have a great influence on the behaviour choice of the other two bodies, and the process of each strategy choice by the three bodies is a dynamic game process of the three bodies. Finally, according to the main influencing factors reflected in the equilibrium solution, proposed the related non-point source pollution control countermeasure suggestion to the government main body.

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Mathematical model development for non-point source in-stream pollutant transport

Adu Joy, Kumarasamy Muthukrishna Vellaisamy

Archives of Environmental Protection

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2020

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Vol. 46, no. 2

91--99

EN

Non-point source pollution is a primary cause for concern globally. Various models have been developed to tackle this situation with much emphasis placed on best management practices. This practice has, however, proven to be insufficient to solve the NPS pollution situation. Existing non-point source models are watershed- -based and complicated both in operation, parameter estimation and data requirements. A non-point source model is proposed using the concept of the Hybrid Cells in Series model. The model is a three-parameter model made up of three zones, which describes pure advection through time delay in a plug zone, with combined advection and dispersion occurring when the other two zones are considered as thoroughly mixed. The proposed model is tested using synthetic data and field data from the Snake River, Colorado, USA, obtained from literature. Simulations were performed at four sample points; two from the tracer injection point along the Snake River before a confluence and two further downstream after the confluence. A regression analysis was carried out to determine the model’s capability to simulate pollutant transport for the four sampling points. The coefficients of determination are 0.98, 0.94, 0.84 and 0.97 while the standard error for each reach is 2.28E-2, 2.70E-2, 2.32E-2 and 9.35E-3 respectively. The results show good agreement between the measured and the simulated data. The response of the C-t profiles produced by the proposed model for both synthetic and field data demonstrates its ability to effectively simulate pollutant transport in natural rivers subject to non-point source pollution.

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Study on land application of sewage sludge in Beijing

Jie L., Bi-Yong X., Jie Z.

Zeszyty Naukowe. Inżynieria Środowiska / Politechnika Opolska

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2003

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Vol. 291, z. 4

503-509

EN

The treatment of sludge is an integral part of a wastewater treatment process. With the volume of sewage sludge requiring disposal increasing significantly in Beijing as sewage treatment facilities have been extended, a more and more critical pressure has been exerted on the facilities and the environment. Based on the analysis of sludge's quality, quantity and Beijing's land quality status, the perspective of land application of sewage sludge is presented. It would bring us a notable benefit both in environment and society. It is indicated that we could obtain two hundreds million yuan per year and alleviate about 30 percent of nitrogen load in agriculture non-point source pollution, with applying one million tons sludge manures to the farmland. In conclusion, we state that it is the best choice for Beijing to apply the sewage sludge to the land.