Desulphurization wastewater zero discharge system of coal-fired unit of thermal power plant

Abstract

The invention relates to a desulphurization wastewater zero discharge system of a coal-fired unit of a thermal power plant. The system sequentially comprises a sequencing batch reactor, a double-medium filter, a Na/Cl bed, an electrodialysis device, a high-pressure water pump, a security filter, a primary reverse osmosis device and secondary reverse osmosis device. The sequencing batch reactor is used for removing metal ions and sulfate radicals in water. The double-medium filter is used for furthermore removing suspended matter in water. The Na/Cl bed is used for removing high-valence ions such as calcium ions and magnesium ions in water. The electrodialysis device is used for concentrating wastewater. The high-pressure water pump and the security filter are used for transferring the wastewater and removing fine particles in the wastewater. The primary reverse osmosis device and the secondary reverse osmosis device are used for performing further desalination on water. The desulphurization wastewater zero discharge system has the advantages that the sequencing batch reactor is adopted, the load impact resistance of the system is improved, and water can be clear and conditioned; the ion selecting and adsorbing function of the Na/Cl bed is adopted, and crystallized products reach industrial purity; by means of high salt content of electrodialysis concentrated water, regeneration of the Na/Cl bed is achieved; the secondary reverse osmosis device is adopted, the desalination efficiency is high, and investment is saved; no new substances is generated in the whole process.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a zero-discharge system for desulfurization wastewater of a coal-fired unit in a thermal power plant. Background technique [0002] In recent years, my country's requirements for zero discharge of industrial wastewater from newly built thermal power plants have become higher and higher. However, in actual operation, due to the high salt content of desulfurization wastewater after treatment, it cannot be reused, and the method of mixing with rainwater is generally used. out of the factory. At present, there is no mature desulfurization wastewater treatment technology at home and abroad. The existing zero-discharge technologies for desulfurization wastewater mainly include evaporator plus crystallization drying process, forward osmosis concentration plus crystallization drying process, high-efficiency reverse osmosis OCRC plus crystallization drying, etc., but among these technologie...

AI Technical Summary

Problems solved by technology

At present, there is no mature desulfurization wastewater treatment technology at home and abroad. The existing zero-discharge technologies for desulfurization wastewater mainly include evaporator plus crystallization drying process, forward osmosis concentration plus crystallization drying process, high-efficiency reverse osmosis OCRC plus crystallization drying, etc., but among these technologies There are generally disadvantages of high investment costs and immature technology

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