Wastewater treatment in leather industry is an important environmental protection issue. Tannery wastewater usually contains high concentrations of organic matter, acid substances, heavy metal ions, suspended solids and other pollutants. If not properly treated, it may have a serious impact on the environment and human health.
Tannery wastewater treatment It involves multiple links and technologies. Common treatment processes include physical, chemical and biological treatment. The following are some common tanning wastewater treatment methods:
1. Sedimentation: By adjusting the pH value and adding precipitating agent, suspended solids and some heavy metals and other pollutants can be precipitated into the sludge, so as to achieve preliminary Solid-liquid separation 。
2. Activated carbon adsorption: use the characteristics of activated carbon to adsorb organic substances, such as acid dyes, oils, etc., so as to reduce the organic pollutants in sewage.
3. Biological treatment: decomposition and transformation of organic matter, nitrogen, phosphorus and other pollutants through the use of microorganisms. For example, the active pool of aerobic and anaerobic microorganisms is used for biodegradation.
4. Membrane separation: filter with microporous membrane or reverse osmosis membrane to remove suspended solids, pigments and dissolved organic matter in sewage.
5. Chemical oxidation: use chemical oxidants such as chlorine or hydrogen peroxide to oxidize organic substances into harmless substances in chemical reaction.
The above are just some common tanning wastewater treatment methods. The actual treatment process needs to comprehensively consider the nature of sewage, discharge standards, treatment requirements and other factors, and select appropriate treatment schemes and equipment.
The comprehensive use of a variety of treatment processes and technologies can more effectively treat tannery wastewater, and achieve emission reduction and resource recycling. The treated sewage is discharged or reused after reaching the standard, which is not only conducive to environmental protection, but also meets the requirements of sustainable development.
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