The zero discharge technology of auto parts wastewater aims to transform the wastewater generated in the production process into reusable water resources through effective treatment methods, so as to realize the reduction, resource utilization and harmlessness of wastewater. The technology is mainly based on physical, chemical and biological treatment methods, through a multi-stage treatment and reuse system, to ensure that the harmful substances in the wastewater are effectively removed to meet the discharge standards or reuse requirements.
Key technologies
Pretreatment technology: Pretreatment is the first step of zero discharge of wastewater, and the main purpose is to remove large particles of impurities, oil and suspended solids in wastewater. Commonly used pretreatment techniques include grid filtration, sedimentation, degreasing, etc.
Membrane separation technology: Membrane separation technology is a key link to achieve zero wastewater discharge, including reverse osmosis, nanofiltration, ultrafiltration, etc. These technologies use semi-permeable membranes that allow water molecules to be filtered through the membrane under pressure, while salts, organic matter, and microorganisms are trapped. Membrane separation technology has the characteristics of high efficiency, energy saving and environmental protection.
Advanced oxidation technology: Advanced oxidation technology is an effective solution for difficult-to-treat organic matter and nutrients such as nitrogen and phosphorus. This technology converts organic matter into inorganic substances such as carbon dioxide and water by generating hydroxyl radicals (·OH) with strong oxidizing ability. Common advanced oxidation techniques include Fenton reaction, photocatalytic oxidation, etc.
Biological treatment technology: Biological treatment technology uses the metabolic action of microorganisms to convert organic matter in wastewater into harmless or low-toxicity substances. Common biological treatment technologies include activated sludge method, biofilm method, etc.
Reuse system: Treated wastewater needs to be stabilized and retreated by a reuse system to meet the requirements of production water. The reuse system usually includes disinfection, pH adjustment, softening and other links to ensure the safe and reliable water quality of the reclaimed water.