COD Removal Technology for High Salt Wastewater

Generally, high salt wastewater refers to wastewater containing organic matter and at least 3.5% (mass fraction) of total dissolved solids (TDS). This type of industrial wastewater has a complex composition, containing not only a large amount of inorganic salts, but also various toxic and harmful substances that are difficult to degrade. The accompanying COD is usually high, which has a certain selectivity for wastewater treatment equipment and is difficult to treat.

At present, with the rapid development of the national economy, a large amount of high salt wastewater is generated in fields such as printing and dyeing, papermaking, chemical industry, oil refining, and seawater utilization. If high salt wastewater is directly or simply diluted and discharged, it will cause water resource waste on the one hand; On the other hand, it will have a bad impact on the environment, accelerate the eutrophication of Rivers and Lakes, cause the collapse of the soil ecosystem, produce stench, affect the water quality, change the color and visibility of the water body, and form a large number of suspended solids in the water body. With the development of industry, more and more high salt wastewater is generated, with increasingly complex components and higher COD concentrations. Therefore, research on effective COD removal methods for high salt wastewater is urgently needed. Usually, biological methods are used as pretreatment, followed by physical concentration processes such as membrane separation and evaporation to reduce salt content and remove COD.

Among them, the biological treatment method mainly utilizes microorganisms to oxidize and decompose organic matter. By domesticating microorganisms that exist in nature and utilizing their own reproductive metabolism to treat organic matter in wastewater, biological treatment methods have the characteristics of high efficiency, economy, and harmlessness in the treatment of organic pollutants. Microorganisms have diverse species and can adapt strongly to various wastewater environments through mutation. They also have good metabolic capacity and can produce specific degradation enzymes to treat various high salt wastewater, with great potential.

The conventional method for treating high salinity wastewater is mainly through reverse osmosis. The membrane separation process of reverse osmosis equipment refers to the separation technology that uses the selective permeability of membranes to separate, purify, and concentrate different mixture components in high salt wastewater. It has the advantages of strong adaptability and good selectivity. However, high salt wastewater is prone to membrane blockage, pollution, and corrosion in wastewater treatment equipment.

The Jiangsu Haipu adsorption process has shown significant effectiveness in removing COD from high salt wastewater and has been successfully applied to multiple enterprises. The principle is to use the special adsorption material developed by our company to accurately adsorb COD components in high salt wastewater, and then regenerate the adsorption resin through a desorption agent to restore its activity, thus continuously circulating. This process mainly has high adsorption capacity, high concentration ratio, low equipment investment cost, easy operation, long resin life, and very convenient operation and maintenance. Welcome enterprises with needs to come for free consultation.