Leather wastewater treatment- Green technology promotes the development of environmental protection industry

The leather industry is one of the important traditional industries in my country, and its products are widely used in clothing, footwear, furniture and other fields. However, a large amount of wastewater is generated during the leather production process, causing serious pollution to the environment. Leather wastewater has the characteristics of large water volume, complex water quality, a wide variety of pollutants, and high concentration, which makes it difficult to treat. Therefore, leather wastewater treatment has become an important research direction of my country's environmental protection industry. 2. Sources of leather wastewater and characteristics of pollutants Leather wastewater mainly comes from leather making, fur processing and leather product production. According to different processing processes, leather wastewater can be divided into the following categories: 1. Pre-tanning preparation wastewater: mainly includes wastewater from washing, soaking, dehairing, liming, deliming, softening, degreasing and other sections. This type of wastewater contains a large amount of suspended matter, organic matter and inorganic salts, and has the characteristics of large water volume, high pollution load and high chroma. 2. Tanning wastewater: mainly includes wastewater from washing, pickling, tanning and other sections. This type of wastewater contains heavy metal ions (such as chromium, zinc, etc.), organic matter and inorganic salts, and has the characteristics of large water volume, high pollution load and high chroma. 3. Wastewater from the finishing process: mainly includes wastewater from washing, squeezing, dyeing, greasing, dust removal and other processes. This type of wastewater contains pollutants such as dyes, grease, organic compounds, and has the characteristics of large water volume, high pollution load and high chroma. 3. Leather wastewater treatment process The leather wastewater treatment process mainly includes three stages: pretreatment, biochemical treatment and deep treatment. 1. Pretreatment: Pretreatment is an important part of leather wastewater treatment, mainly including facilities such as grids, sedimentation tanks, regulating tanks, and flotation tanks. The main task of pretreatment is to adjust water volume and water quality, remove suspended matter, grease and other pollutants, and create good conditions for subsequent treatment. 2. Biochemical treatment: Biochemical treatment is the core part of leather wastewater treatment, mainly including activated sludge method, biofilm method, etc. The main purpose of biochemical treatment is to degrade organic pollutants in wastewater and reduce pollution load. 3. Deep treatment: Deep treatment is the last link in leather wastewater treatment, which mainly includes coagulation sedimentation, adsorption, membrane separation and other methods. The main purpose of deep treatment is to further remove pollutants in wastewater and improve the water quality of wastewater. IV. Key technological innovation of leather wastewater treatment In recent years, my country's leather wastewater treatment technology has achieved remarkable results. The following key technological innovations are worthy of attention: 1. Ozone oxidation technology: Ozone oxidation technology can effectively degrade the difficult-to-degrade organic matter in leather wastewater and improve the biodegradability of wastewater. This technology has the advantages of good treatment effect, fast reaction speed and no secondary pollution. 2. Hydrolysis acidification technology: Hydrolysis acidification technology can convert macromolecular organic matter in leather wastewater into small molecular organic matter and improve the biodegradability of wastewater. This technology has the advantages of stable operation and low sludge production. 3. Bioenzyme technology: Bioenzyme technology uses enzymes produced by microorganisms to degrade organic pollutants in leather wastewater. This technology has the advantages of high efficiency, environmental protection and no secondary pollution. V. Conclusion Leather wastewater treatment is an important research direction of my country's environmental protection industry. By innovating leather wastewater treatment technology and improving treatment effects, it is beneficial to protect the environment and promote the sustainable development of the leather industry. In the future, my country's leather wastewater treatment technology will continue to develop in the direction of green, high efficiency and environmental protection, contributing to the green development of the leather industry.