Waste disposal system

Abstract

The invention relates to a waste disposal system. The waste disposal system comprises a pre-cleaning tank, a preheating furnace, a nitrogenation furnace, an oxidizing furnace, a post-cleaning tank, a gas disposal unit, a waste water disposal unit and a waste residue disposal unit. The waste water disposal unit comprises a precipitation tank and a filter tank. The precipitation tank is connected with the pre-cleaning tank, the post-cleaning tank and a water outlet of a spray tower through a waste water pipe a, a waste water pipe b and a waste water pipe c correspondingly. The filter tank is connected with a water inlet of the spray tower through a waste water pipe d. The waste residue disposal unit comprises a residue processing furnace. The gas disposal unit comprises a waste gas pipeline b which communicates a gas outlet of the residue processing furnace with a gas inlet of the spray tower. According to the waste disposal system, separation type disposal of waste water and waste residues is achieved, and centralized deep purification of waste gas or the waste water or the waste residues produced in each working procedure is conducted. The system performance is stable, the failure rate is low, and the waste disposal system has the advantages of being high in purification treatment efficiency, simplified in purification treatment step, low in cost and the like.

Description

technical field [0001] The invention relates to a waste treatment system for resource treatment of waste water, waste residue and the like generated during nitrogen, carbon and oxygen compound treatment. Background technique [0002] In the field of heat treatment technology, in order to improve the hardness, wear resistance and corrosion resistance of metal workpieces, a series of surface modification technologies such as impurity removal, nitriding and oxidation treatment are required for the workpiece, but in the traditional heat treatment process , Each process is independent of each other and carried out in a single manner, and there is no connection between them. The waste generated is also purified separately. The process is complicated and increases the cost of waste purification. [0003] Chinese invention patent 201410243622.7 discloses a nitrogen, carbon and oxygen compound treatment process and device, including pre-cleaning, preheating, nitrocarburizing, oxidati...

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Problems solved by technology

Although this process and its corresponding devices realize the combination of nitriding process and oxidation process and improve the efficiency of exhaust gas purification, according to the applicant's report, there are still some shortcomings in the process of use: in the process of compound treatment, each process is accompanied by Some waste water or waste residue will be produced, especially the waste water produced after water spraying is large and toxic, as well as the waste residue left after the reaction of nitriding furnace and oxidation furnace. The traditional treatment method is to conduct centralized solid waste treatment, but its The quality is large, the purification process is cumbersome, and the efficiency is low. At the same time, because some unreacted nitride salts, adjustment salts or oxide salts and other cyanide-containing salts still remain in the waste residue, they are toxic and easily soluble in water. Without sufficient purification treatment, it is easy to cause secondary pollution to the environment, but the process and device do not carry out deep purification and recycling treatment for the above-mentioned wastewater and waste residue, resulting in unnecessary waste of resources

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