Thermal power plant circulating water blow-down water electrodialysis desalination treatment system and method thereof

Abstract

The invention discloses a thermal power plant circulating water blow-down water electrodialysis desalination treatment system and a method thereof. An outlet of a circulating water blowdown pool is communicated with an inlet of the middle pool through a lime softening treatment system; an outlet of the middle pool is communicated with an inlet of a ceramic membrane ultrafiltration treatment system; wherein an outlet of the ceramic membrane ultrafiltration treatment system is communicated with an inlet of a ultrafiltration water production tank, an outlet of the ultrafiltration water productiontank is communicated with an inlet of the electrodialysis treatment system, a clear water outlet of the electrodialysis treatment system is communicated with an inlet of a fresh water tank, and a concentrated water outlet of the electrodialysis treatment system is communicated with an inlet of the concentrated water tank; and the sludge outlet of the lime softening treatment system and the wastewater outlet of the ceramic membrane ultrafiltration treatment system are connected with a waste treatment system. The system and the method have the advantages that the treatment and the recycling ofthe circulating water sewage of a thermal power plant can be realized, the operation cost is lower, and the economy is better.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and relates to an electrodialysis desalination treatment system and method for circulating water discharge sewage of a thermal power plant. Background technique [0002] Circulating water sewage accounts for more than 70% of the total wastewater of circulating cooling thermal power plants, and its treatment and reuse is the key to realizing water saving and emission reduction in thermal power plants. Under the condition of high concentration ratio of circulating water, the salinity, COD, SiO 2 , hardness, alkalinity and other indicators are high, and contains a large number of water quality stabilizers, increasing the difficulty of circulating water sewage treatment. Recycling water reuse mostly adopts reverse osmosis desalination technology, and mostly adopts "coagulation clarification + filtration + reverse osmosis desalination" process. Due to the imperfect pretreatment design, the revers...

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Problems solved by technology

[0003] At present, some power plants have optimized the pretreatment system of circulating water reverse osmosis treatment, and put forward the plan of "two-stage softening + media filtration + ultrafiltration + reverse osmosis". Due to the long treatment process, the investment cost is relatively high

In addition, lime, sodium carbonate, coagulant, coagulant aid, acid, alkali, scale inhibitor, reducing agent and other chemicals need to be added during the operation process, the operating cost is high, and the economy of the system operation is poor

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