Introduction to Desulfurization Wastewater Treatment Technologies

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The main treatment technologies used in desulfurization wastewater are as follows: 1. Low-temperature and low-evaporation process – This process makes use of waste heat, and it involves treating the wastewater at low temperatures and with low evaporation rates; most high-boiling-point organic compounds and salts are dried and then disposed of as a concentrated solution. Same as the desulfurization system. 2. Membrane concentration and membrane salt separation – Main process flow: sedimentation tank + softening and calcium removal + multi-media filter, ultrafiltration + DTRO membrane unit + evaporation crystallization. The main function of the sedimentation tank is to carry out pre-sedimentation; lime is added to soften the water, while acids and bases are used to adjust its pH level, simultaneously removing suspended particles with high specific gravity from the water, thereby providing an initial level of water purification. The multi-media filter and ultrafiltration systems serve to further remove suspended solids, colloids, and other impurity particles from the raw water, reducing turbidity and ensuring that the water meets the requirements for use in reverse osmosis systems, thus extending the lifespan of the reverse osmosis membranes ； The water from the multi-media filter and ultrafiltration unit enters the R0 membrane module. Thanks to the selective permeability of the DTRO membrane, water can pass through this membrane under high pressure and enter the fresh water side, while various salts are carried away by the high-pressure water flow, thus separating the salt from the water ； The final concentrated solution enters the evaporator for evaporation and crystallization. 3. Electrodialysis treatment: The main process flow consists of a regulation tank + triple box + ultrafiltration unit + electrodialysis cell. Selective removal can be achieved through industrialized electrodialysis technology that utilizes monovalent-selective membranes. Electrodialysis uses valence-anion exchange membranes to selectively separate picrate ions under the influence of an electric field, while blocking counter-anion ions. This will reduce the fluoride concentration in the wastewater, facilitate the internal recycling of desulfurization wastewater, and simultaneously separate out the insoluble sodium chloride and calcium chloride solutions, achieving a water recovery rate of over 0%. Reduce the cost of infrastructure.