A kind of leather sewage discharge reduction treatment method

Abstract

The invention proposes a method for reducing the emission of leather sewage, one of the purposes is to realize zero pollution discharge of leather waste treatment, and the other is to effectively recycle and utilize resources, improve the overall economic benefits, and provide an environmentally friendly wastewater treatment process. It not only realizes the integrated treatment of waste gas and wastewater, but also can efficiently reuse the raw materials for leather preparation and carry out deep processing and utilization of sludge. By separating and reusing the tanning agent through membrane, it not only reduces the treatment pressure of subsequent pollutants, but also saves the materials used in the leather preparation process and reduces the production cost; the integrated and coordinated treatment of waste gas and wastewater, and the integration of different processes Wastewater is firstly pretreated and then aggregated and jointly treated to better target and comprehensively eliminate pollutants in all aspects, realize effective allocation of resources, and greatly improve the efficiency of pollution control in line with the concept of circular economy; realize resource utilization for sludge The utilization of resources reduces the waste of resources and environmental pollution, and meets the requirements of sustainable development and clean production.

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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