Slow-release Fenton-like system based on immobilized enzyme and method for in-situ remediation of groundwater pollution by slow-release Fenton-like system

Abstract

The invention discloses a slow-release Fenton-like system based on an immobilized enzyme, and provides a method for in-situ remediation of groundwater pollution. The method mainly comprises the following steps: 1) selecting a central well and a plurality of peripheral chemical adding wells in a pre-remediated groundwater pollution area; 2) adding green rust into the chemical adding wells, then pumping water from the central well, recharging the water into underground water through the chemical adding well, and continuously pumping water until green rust appears; and 3) arranging an immobilized enzyme reactor in each chemical adding well, conducting aerating, introducing a glucose solution, pumping a small amount of water in the central well, recharging the water into underground water through the chemical adding wells, and pumping water until the concentration of effluent pollutants reaches the standard. The slow-release Fenton-like system has a pH range close to the environment where underground water is located, lasting slow release of free radicals and controllability of a degradation area can be achieved in the whole process, other pollutants cannot be introduced into the underground water, and non-toxicity and harmlessness can be achieved.

Description

technical field [0001] The invention belongs to the technical field of groundwater pollution restoration, in particular to a slow-release Fenton-like system based on immobilized enzymes and a method for in-situ restoration of groundwater pollution. Background technique [0002] Water resources are one of the most important environmental resources for people, which not only affects people's life and production, but also affects people's health and life safety to a large extent. The stacking of hazardous waste generated in industrial production, the residue of a large amount of organic pesticides and fertilizers in the soil in agricultural production, the accumulation of gangue after mining, etc., the pollutants contained in these substances are under the action of rainwater and underground runoff. Entered into ground water in large quantities. As a result, most cities in my country are more or less facing the problem of groundwater pollution. [0003] At present, the remedi...

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Problems solved by technology

[0007] Therefore, the current Fenton-like reaction system has many defects in the process of groundwater pollution remediation, such as the introduction of other pollutants, H 2 o 2 The utilization rate is not high, the in-situ generation rate is low, and under the natural conditions of groundwater, its movement is random, and it is difficult to control after the oxidant is added.

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