Method and system for co-treatment of coking wastewater sludge and tar residues

Abstract

The invention relates to a method and system for co-treatment of coking wastewater sludge and tar residues. The method comprises the following steps: respectively reducing the moisture contents of thecoking wastewater sludge and the tar residues to 30-50% and 70-93% by a pretreatment method; mixing the dehydrated sludge and the dehydrated tar residues, molding, and preparing activated carbon by taking the molded mixture as a raw material. The system comprises a waste mixing unit, a molding unit, a carbonization furnace and an activation reaction tower which are sequentially connected througha material transfer unit. The system also comprises a sludge pretreatment unit and a tar residue pretreatment unit which are respectively used for reducing the water content of the sludge and the tarresidues, and the two pretreatment units are respectively connected with a material inlet of the waste material mixing unit through a spiral conveyor. The dehydrated coking wastewater sludge and tar residues are mixed to prepare the activated carbon, the dehydrated sludge can serve as a carbon-based skeleton structure of the tar residues, the porosity and specific surface area of the activated carbon are increased, cooperative treatment of the coking wastewater sludge and the tar residues is achieved, and the coking wastewater sludge and the tar residues can be turned into wealth.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, and in particular relates to a co-processing method of coking wastewater sludge and tar residue and a co-processing system of coking wastewater sludge and tar residue. Background technique [0002] In the process of coking to prepare gas, coke and coal tar, a large amount of industrial solid waste will be produced; in the process of coking production, 0.1% tar residue will be produced in the process unit, and about 100% will be produced in the coking wastewater treatment unit About 0.2% biochemical sludge. Most enterprises fail to properly recycle and utilize the large amount of sludge and tar residue produced. [0003] In the current resource utilization technology in the field of coking, coking wastewater sludge is a semi-dry solid waste with complex rheology due to its complex composition, containing inorganic substances, toxic and harmful substances (such as microorganisms, org...

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Problems solved by technology

[0006] (2) The viscosity of tar residue and the volatility of its components will cause the oil residue to stick to the belt conveyor and belt idlers, resulting in uneven coal blending process, and the volatility of tar residue components makes The batching is difficult to be precise, which leads to unstable coke quality and increases the heat load of the coke oven

[0007] (3) Due to the presence of a large amount of polycyclic aromatic hydrocarbons (such as polycyclic aromatic hydrocarbons and benzene) in coking wastewater sludge and tar residue, a large amount of toxic and harmful gases will be produced during incomplete combustion as fuel or coal blending additives, causing atmospheric pollution in coking plants. Up-to-standard discharge increases the difficulty and cost of treatment

[0008] The current treatment methods for these two solid wastes cannot achieve environmentally friendly, green and sustainable resource utilization, and the whereabouts of the final treated pollution cannot be effectively guaranteed, and cannot meet the needs of production and environmental protection

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