Process for preparing desalted water for iron and steel plants with slightly polluted surface water as water source

Abstract

The invention provides a process for preparing desalted water for iron and steel plants with slightly polluted surface water as a water source, belonging to the technical field of sewage treatment and recycling. In the process, a high density sedimentation tank, an MBBR (moving bed biofilm reactor), a V-shaped filter and a deep membrane processing unit are adopted. The process is characterized in that the slightly polluted surface water enters a vortex-type grit chamber, an adjusting tank, a high density clarification tank, the MBBR and the physicochemical and biochemical processing units such as the V-shaped filter and the like in sequence after being lifted; the treated water enters an ultrafiltration device and a reverse osmosis device after becoming qualified; and finally the finished water is used by desalting users on the production lines of the iron and steel plants. The process has the advantages that the consumption of new water in the iron and steel plants can be reduced, the water resources can be saved, and the process is simple in flow and low in operating cost, has stable operation effects and achieves better economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and reuse, and in particular provides a process for preparing desalted water for steel plants using slightly polluted surface water as a water source. Background technique [0002] During the steel production process, the heat load is high, the water quality requirements are high, and the water volume is large. As one of the countries short of water in the world, water is an important factor restricting the development of my country's iron and steel industry. In recent years, in order to reduce the wastewater discharge of iron and steel enterprises and reduce the fresh water consumption per ton of steel, more and more iron and steel enterprises are seeking efficient sewage treatment and reuse technologies. At the same time, desalted water is used more and more in steel industry production lines and circulating cooling water replenishment. Desalted water is used as circulating cooling wa...

AI Technical Summary

Problems solved by technology

At present, the production of desalinated water in iron and steel plants usually uses fresh water as the water source. However, since steel is a large water user, the above-mentioned conventional water resources are limited by the amount of water and it is difficult to meet the water requirements. Therefore, using slightly polluted surface water as a water source to prepare desalinated water has become an open source. new technology

[0003] Micro-polluted surface water generally has problems such as organic matter, ammonia nitrogen, phosphorus, high hardness, peculiar smell, and high chroma. Excessive organic matter and ammonia nitrogen are the main problems of water pollution

At present, most of the water purification plants that use surface water as their water source use conventional water purification processes such as coagulation, sedimentation, filtration, and disinfection to remove suspended solids in water, but the removal effect on organic matter and ammonia nitrogen in water is not good. On the one hand, the quality of effluent water is not up to standard On the other hand, it will cause pollution to the subsequent membrane advanced treatment and reduce the service life of the membrane

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