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Desulfuration waste water treatment process with membrane method

A technology for desulfurization wastewater and treatment process, which is applied in the directions of water/sewage multi-stage treatment, neutralized water/sewage treatment, water/sludge/sewage treatment, etc. It can solve the problems of high operating costs and high investment, and it can occupy an area of Small size, reduced investment and operating costs, and low operating pressure

Inactive Publication Date: 2010-05-19
苏州凯新分离科技有限公司
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AI Technical Summary

Problems solved by technology

However, the disadvantages of the above-mentioned desulfurization wastewater treatment process are: the investment is very high, because all the wastewater needs to be evaporated, and the operating cost is very high

Method used

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  • Desulfuration waste water treatment process with membrane method
  • Desulfuration waste water treatment process with membrane method

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Embodiment Construction

[0019] The present invention will be further described below through specific examples, but the present invention is not limited to these examples.

[0020] Such as figure 1 As shown, the desulfurization wastewater membrane treatment process includes the following steps: (1) The pretreatment method is: add quicklime to the raw water tank of desulfurization wastewater, adjust the pH to 9-12, and after the primary reaction and clarification in the clarification tank, Most of the magnesium ions, heavy metal ions, fluoride ions, and suspended solids (SS) have been removed from the effluent, and the concentration of magnesium ions in the effluent is controlled to be <500mg / L; then, according to the concentration of calcium ions in the effluent, the molar ratio is 1:1. , add an appropriate amount of soda ash, after the secondary reaction and clarification tank, remove calcium ions and the remaining part of heavy metal ions, and control the concentration of calcium ions in the efflue...

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Abstract

The invention discloses a desulfuration waste water treatment process with a membrane method, comprising the following steps: pre-treatment, one-level membrane treatment and two-level membrane treatment; the treatment process has the advantages that the waste water amount of evaporation treatment can be effectively reduced while fresh water is recycled, industrial salt can be recycled, the energy consumption is greatly reduced, waste water discharge is reduced, the problem of cyclic utilization of desulfuratin waster water can be effectively solved, and the process has good economic and social benefits; by adopting the membrane method, the desulfuration waste water has high recovery rate, and the reused water volume can reach more than 50-70 percent through two-level membrane treatment or multi-level membrane treatment, and an evaporation method is combined, zero discharge of the waste water can be realized; lower operating pressure is adopted, the investment and operating cost is reduced, the process equipment is simple, the occupying area is small, full-automatic operation is realized, and the operation is simple and convenient.

Description

technical field [0001] The invention relates to a wastewater treatment process, in particular to a desulfurization wastewater membrane treatment process. Background technique [0002] Desulfurization wastewater will be produced in the process of boiler flue gas wet desulfurization (limestone / gypsum method), and the desulfurization wastewater comes from the discharge water of the absorption tower. In order to maintain the balance of substances in the slurry circulation system of the desulfurization unit, prevent the equipment from being eroded by the chloride ion concentration in the flue gas exceeding the specified value, and ensure the quality of the gypsum, a certain amount of desulfurization wastewater must be discharged from the system. The wastewater mainly comes from gypsum dehydration and Clean the system. The specific water quality of desulfurization wastewater is related to factors such as the type of coal fired, the air volume of desulfurization and oxidation, the...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/66C02F1/52C02F1/44
Inventor 屈峰许卫平
Owner 苏州凯新分离科技有限公司
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