Leather sewage emission reduction treatment method

Abstract

The invention provides a leather sewage emission reduction treatment method. One purpose is to realize zero-pollution discharge of leather waste treatment, and the other purpose is to effectively recycle resources and improve the overall economic benefit, so that the environment-friendly wastewater treatment process is provided, the integrated treatment of waste gas and wastewater is realized, theraw materials for leather preparation can be efficiently recycled, and the sludge is deeply processed and utilized. The tanning agent is subjected to membrane separation and recycling, so that the treatment pressure of subsequent pollutants is reduced, materials used in a leather preparation process are saved, and the production cost is reduced; waste gas and waste water are subjected to integrated cooperative treatment, the waste water in different procedures is pretreated firstly and then gathered for common treatment, pollutants existing in all aspects are eliminated more specifically andcomprehensively, effective allocation of resources is achieved, the concept of circular economy is met, and the pollution treatment efficiency is greatly improved; resource utilization of the sludge is realized, resource waste and environmental pollution are reduced, and the requirements of sustainable development and clean production are met.

Description

technical field [0001] The invention relates to the field of chemical waste treatment. Specifically, the present invention is an environment-friendly leather three-waste integrated treatment and reuse process. Background technique [0002] In recent years, the rapid development of the leather industry has also brought about a large number of environmental pollution problems. With the development of social economy and the improvement of people's environmental protection requirements, the treatment of the three wastes produced by leather factories has attracted more and more attention. Leather exhaust gas mainly comes from workshops and sewage treatment stations, which contain a large amount of acid gas and volatile organic components, while leather wastewater comes from various preparation processes, with a wide variety of pollutants, usually manifested as high concentrations of chromium and sulfide, as well as COD, ammonia nitrogen compounds and salt etc. [0003] For a lo...

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Problems solved by technology

[0003] For a long time, at present, the existing waste gas, wastewater and sludge treatment in the leather industry is mostly divided into several processes and carried out separately, resulting in waste of manpower and time. In the leather processing process, there are a large number of preparations in the more commonly used chrome tanning agents. It is absorbed by the leather and enters the waste water, which not only causes waste of leather resources, but also brings serious water pollution problems

[0004] There are many and complex pollutants in the comprehensive leather wastewater, and it is difficult to treat the wastewater to meet the national water quality standards through a single treatment method. If all types of wastewater are first confluent and then treated in a unified manner, it will inevitably be inefficient and cause waste of treatment chemicals and energy. The waste of equipment does not meet the production requirements, and the direct discharge or landfill treatment of the sludge generated in the wastewater treatment process will also bring great harm to the environment and human beings. The treatment of tannery sludge has also attracted widespread attention.

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