Thermal power plant weak acid cation bed regeneration wastewater quality grading reuse system and thermal power plant weak acid cation bed regeneration wastewater quality grading reuse method

Abstract

The invention discloses a thermal power plant weak acid cation bed regeneration wastewater quality grading reuse system and a thermal power plant weak acid cation bed regeneration wastewater quality grading reuse method. The system comprises a weak acid cation bed, a drainage ditch, a wastewater collection pool, a cooling tower and a desulfurization reuse water pool. According to the invention, based on the regeneration step characteristics of the weak acid cation bed, the start and the stop of a pump are optimally designed, so that the flushing water and the regeneration wastewater in the regeneration stage of the weak acid cation bed can be subjected to quality grading collection and reuse; and a certain amount of cooling tower circulating water is introduced in a regeneration replacement stage to carry out dilution, neutralization and scale inhibition on the regeneration wastewater, so that calcium sulfate can be effectively prevented from being separated out and scaled in the wastewater pool and the conveying pipeline while the alkali consumption for neutralization is reduced so as to well solve the difficult problem of weak acid cation bed regeneration wastewater reuse.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to a system and method for separating and reusing wastewater from regenerated weak-acid cation beds in thermal power plants. Background technique [0002] Weak acid cation bed is a kind of water treatment equipment that is relatively common in thermal power plants. Sulfuric acid is generally used for regeneration. The regeneration process is: outage→backwash→acid regeneration→replacement→forward washing→commissioning. Demineralized water is used for regeneration water, and a regeneration cycle is generally about 4 hours. At present, all wastewater in the regeneration stage is discharged to the wastewater collection pool through the drainage ditch, and the wastewater is reused or discharged after pH adjustment by adding alkali. However, the amount of wastewater produced by this recycled wastewater collection and treatment process is relatively large, and the ...

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Problems solved by technology

However, the amount of wastewater produced by this recycled wastewater collection and treatment process is relatively large, and the wastewater has not been classified and reused. Moreover, because the wastewater contains a large amount of calcium ions and sulfate ions, it is easy to form calcium sulfate precipitation. Scale is precipitated in the wastewater pump and delivery pipeline, causing blockage and equipment failure. Generally, the wastewater pool needs to be manually cleaned 3-4 times a year, and the wastewater discharge system needs to be chemically cleaned every 1-2 years.

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