Pretreatment method of liquid hazardous waste

Abstract

The invention relates to the technical field of hazardous waste treatment, and specifically discloses a pretreatment method for liquid hazardous waste, including S1: identification, treatment and storage of liquid hazardous waste, rough filtering of liquid hazardous waste to obtain LDF coarse filter material and transporting it into a raw material tank ;S2: Classification treatment of different LDF coarse filter materials, waste acid LDF coarse filter material, waste oil LDF coarse filter material, waste alkali LDF coarse filter material and waste solvent LDF coarse filter material are transported to the corresponding LDF coarse filter material after risk reduction and impurity removal. In the metering tank, and respectively transported to the corresponding reactor at a certain flow rate; S3: Neutralization, redox reaction, the compatibility of the reactants is carried out according to the nature of the liquid hazardous waste, and the reactants are transported to the reactor for risk reduction After treatment, LDF risk reduction material is obtained; S4: LDF risk reduction and impurity removal material is obtained after impurity removal; S5: finished product storage. The hazardous waste treated by the invention is a standardized product that can be directly kiln fired by a cement kiln, which not only ensures the stability of product quality, but also has uniform and stable properties of the input product during the kiln firing process.

Description

technical field [0001] The invention relates to the technical field of hazardous waste treatment, in particular to a pretreatment method for liquid hazardous waste. Background technique [0002] Hazardous waste refers to waste that is included in the national list of hazardous waste or identified according to the national hazardous waste identification standards and identification methods, and has one or more of corrosive, toxic, flammable, reactive or infectious a dangerous characteristic. The hazards of hazardous waste include damaging the environment, affecting human health, and restricting sustainable development. Hazardous waste is usually divided into three types according to different material forms: solid hazardous waste, semi-solid hazardous waste and liquid hazardous waste. The traditional treatment methods for hazardous waste usually include landfill and incineration. Direct landfill of hazardous waste without treatment will pollute the soil, and direct incinera...

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Problems solved by technology

The following problems exist in the co-processing of liquid hazardous waste in cement kilns: 1. Liquid hazardous waste contains a large amount of acidic substances, alkaline substances, oily substances and solvents, etc., and it is easy to cause harm to the cement kiln for direct treatment in the kiln. Moreover, due to the lack of a standardized pre-treatment process for liquid hazardous waste, its properties cannot meet the needs of kiln firing when it enters the kiln head; 2. Due to the lack of identification of hazardous waste, the combustion value and There are large differences in indicators such as pH, and the properties are not uniform and stable. Therefore, when co-processing liquid hazardous waste in cement kilns, it is necessary to frequently adjust the kiln conditions according to the actual situation of liquid hazardous waste of different properties. The temperature in the kiln is high and low, which not only improves It is difficult to adjust the control, and frequently adjusting the kiln conditions of the cement kiln will also make it difficult to maintain stable quality of the output product; 3. Due to the lack of identification of hazardous waste, it is difficult to control the halogens in hazardous waste. When hazardous waste contains excessive When there is too much Cl element, it will cause the crust in the cement kiln, resulting in the problem that the treatment capacity and treatment efficiency cannot meet the preset requirements.

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