The pollution of leather production can be summarized by "dirty, stinky, tired". Dirty, mainly refers to the production of a large amount of wastewater containing heavy metals in its initial processing; stinky, said that these wastewaters usually give off a pungent smell; tired, because the leather industry is a worker A large workload industry.
These three words that contradict the environmental protection, in the view of Li Weijuan, are the clues to find a breakthrough in sewage treatment. Investigate the cause, the reason why the leather industry is "dirty, stinky, tired", its production source played a decisive role. “The treatment of sewage in the leather industry is mainly a two-word ‘elimination of backward production capacity’ and ‘clean production.’” Li Weijuan said, “governing the source of production is a breakthrough in the treatment of sewage in the leather industry*.”
Around these two sentences, it is imperative to eliminate some small enterprises that do not have the ability to control the environment. “Leather is a traditional industry. These small enterprises are small and scattered, and they do not have the ability to control their own pollution. Therefore, sewage discharge is often not up to standard, which seriously affects the overall reputation of the leather industry in our province.” Li Weijuan said. For large enterprises, it is the right way to promote clean production by transforming the pollution end treatment to source prevention, process control, and equipment transformation through technological transformation.
When talking about the governance of Haining, a city dominated by leather, Li Weijuan mentioned an important technology to control “dirty and stinky” – “three water separation”, namely through the transformation of chromium-containing wastewater, dyeing wastewater, and comprehensive Waste water to reduce the pollution of heavy metals to water. For “tired”, companies need to improve the production process to limit the use of raw materials and reduce the amount of raw materials entering the wastewater. As a result, the sewage is controlled at the source level and killed in the cradle.
After grasping this breakthrough, the Haining tannery has achieved the discharge of pollutants such as waste water, waste gas and solid waste, and the number has been reorganized from the original 38 to 8 of the current, of which 5 have achieved scale. benefit.