A tunnel kiln structure and a method for treating organically polluted soil in the tunnel kiln

Abstract

The invention provides a novel tunnel kiln structure and a method for processing organic polluted soil. The method comprises the steps of detecting types and contents of mineral substances in the organic polluted soil, then adding required materials according to the tile firing requirements or the firing requirements, adding internal fuel, adding water to mix the materials to obtain raw pug materials, sequentially pugging, pelletizing, extruding and forming the raw pug materials, decaying or curing the raw pug materials for 5-10 days, drying the raw pug materials, sending the raw pug material into the tunnel kiln to be fired, sequentially keeping green bricks or green tiles in a preheating zone kiln body at the temperature of 150-750 DEG C for 30 minutes to 1 hour and in a firing zone kiln body at the temperature of 750-1350 DEG C for 2-3 hours, then sending the green bricks or the green tiles into a cooling zone kiln body to be naturally cooled to the normal temperature and outputting the green bricks or the green tiles. The method can completely remove toxic substances like various pesticide residues in the soil through high temperature and is high in processing efficiency, low in cost, free of secondary pollution and obvious in environmental-friendly benefit.

Description

technical field [0001] The present application is a method for treating organic polluted soil, specifically a method for treating organic polluted soil in combination with a tunnel kiln and preparing organic polluted soil into bricks, tiles or ceramics. Background technique [0002] With the continuous development of my country's economy and society, various places are vigorously promoting the construction of an environment-friendly and resource-saving society. Some traditional polluting enterprises, such as pesticide factories, have undergone industrial adjustment or relocation, but a large amount of pesticides will inevitably remain on the original site. The production and use of highly toxic organic pesticides such as 666, DDT, etc. are expressly prohibited. The residues of these highly toxic substances have caused serious soil pollution, which directly affects the normal re-opening and utilization of the original factory area and adjacent areas. Bring a series of long-term...

AI Technical Summary

Problems solved by technology

[0005] 2. Thermal desorption restoration technology, heating the soil contaminated by organic matter to above the boiling point of the organic matter, so that the organic matter in the adsorbed soil volatilizes into a gaseous state and then separates it. The Chinese invention patent application number 201210010234.5 discloses this method. This method increases the heating time of the soil so that the organic matter adsorbed in the soil will be released into the atmosphere directly in a gaseous state, but this method actually solves the problem of soil pollution, but the organic matter is discharged into the atmosphere in the form of gas , causing new pollution

The invention patent with the Chinese patent application number 201110206407 discloses a method of sintering ceramsite by using high-chromium-contaminated soil, but this method is limited to high-chromium-contaminated soil, and the sintered product is ceramsite, and it is under laboratory conditions implementation, no method proposed for large-scale treatment of organically contaminated soils

The invention patent with the Chinese application number 201210009647 discloses a method of sudden chemical rinsing of pollution. After rinsing the organically polluted land with water mixed with ozone, it is repaired with a biological method. This method It takes a long time to restore, and vetiver needs to be introduced and planted. For China, since vetiver is an alien species, it will cause an ecological disaster caused by the invasion of alien species

[0009] 6. Composting method, which mainly uses the traditional composting method to pile up polluted soil, mixes pollutants with organic matter (straw, wheat straw, wood chips and bark, etc.), manure, etc., and relies on the microbial action in the composting process to degrade the soil. For organic pollutants that are refractory to degradation, the implementation of this method is relatively complicated, and pollutants such as feces will emit a strong odor, which seriously affects the quality of control

This method is for acidic soil remediation and is not applicable to other organically polluted soils

[0013] The implementation of many of the above methods is cumbersome, and consumes a lot of energy, the cycle is long, and the progress is slow. Most of the methods are prone to secondary pollution and are not suitable for large-scale contaminated soil. The most important problem is that there are only social benefits and no direct economic benefits.

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