Reclaimed water irrigation underground water pollution risk assessment method

Abstract

The invention relates to a reclaimed water irrigation underground water pollution risk assessment method comprising the following steps: 1, gathering the water quality and water level of each monitoring point, and gathering positioning data and attribute data of land utilization types data; 2, building a DRASTIC model according to underground water depth, net supplement amount, aquifer medium, soil type and aeration zone medium data; scoring the underground water depth, the rainfall infiltration supplement, the aquifer medium, the soil type and the aeration zone medium influences, drafting a score graph, superposing and calculating and evaluating the underground water inherent antifouling property; 3, building a hierarchy analysis method according to the characteristic pollutant toxicity,mobility and degradability, and evaluating the underground water pollution load risks; 4, calculating the underground water values according to the aquifer characteristics, water volume, water quality, ecology and service functions; 5, calculating the reclaimed water irrigation underground water pollution risks according to the underground water inherent antifouling property, the underground waterpollution load risks, and the underground water values.

Description

technical field [0001] The invention relates to a groundwater pollution risk assessment method, in particular to a groundwater pollution risk assessment method for reclaimed water irrigation. Background technique [0002] Under the situation of increasingly scarce water resources, recycled water plays an important role in agricultural irrigation. It is estimated that the area of ​​sewage irrigation in the world reaches about 20 million hm 2 , and listed recycled water irrigation as an important measure to solve the water crisis (FAO, 2012). The total amount of reclaimed water reused in Israel, Australia and Tunisia will respectively reach 25%, 11% and 10% of the total demand for water resources (Lazarova, 2001). Australia's Werribee farm began to use recycled water for irrigation in 1897 (McPherson, 1979), and 42% of the recycled water in the United States is used for agricultural irrigation. my country's reclaimed water irrigation has also achieved rapid development in re...

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Problems solved by technology

For a long time, domestic and foreign scholars have carried out many studies on the impact of reclaimed water irrigation on crop yield and soil quality, but there are relatively few systematic studies on the risk of groundwater environmental pollution for reclaimed water irrigation; The main problems are as follows: (1) There are few reports on in-situ layered monitoring experiments on groundwater pollution caused by reclaimed water irrigation at home and abroad. The selection lacks the support of experimental data. In the quantification of pollution load, the land use type is used as the input risk or nitrogen is used as the characteristic pollutant for spatial superposition to obtain the pollution risk map; (2) Groundwater anti-pollution performance evaluation parameters of the DRASTIC model Although there are many research results on the optimization of the parameters, there are relatively few studies on the rationality of parameter scoring, and there are few studies on the improvement of parameter scoring methods, and the improvement of the model lacks corresponding statistical data support; (3) a set of parameters has not yet been established. A risk assessment method for groundwater pollution of reclaimed water irrigation based on the water quality characteristics of reclaimed water and considering the toxicity, migration and degradation characteristics of pollutants

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