Recycling treatment device for desulfurized waste water and method thereof

A technology for desulfurization wastewater and treatment devices, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc.

Active Publication Date: 2015-12-09
江苏卓博环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes a desulfurization wastewater resource treatment device and its method. Its purpose is to solve the problems existing in the current desulfurization iron wastewater treatment, aiming to use the pretreatment system, the membrane concentration treatment system, and the evaporation crystallization system to recycle the desulfurization wastewater. processing

Method used

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  • Recycling treatment device for desulfurized waste water and method thereof
  • Recycling treatment device for desulfurized waste water and method thereof
  • Recycling treatment device for desulfurized waste water and method thereof

Examples

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Embodiment

[0029] 35m for a power plant flue gas limestone-gypsum wet desulfurization 3 / h Desulfurization wastewater resource treatment project.

[0030] 1. Design water quality and quantity

[0031] (1) Design the water quality and quantity of desulfurization wastewater

[0032] project pH SS(mg / L) Ca 2+ (mg / L) Mg 2+ (mg / L) Na + (mg / L) Desulfurization wastewater 4～6 9340 1320 4560 170 project Cl - (mg / L) SO 4 2- (mg / L) F (mg / L) SiO 2 (mg / L) TDS(mg / L) Desulfurization wastewater 11640 5750 3 45 23800

[0033] The volume of desulfurization wastewater is 35m 3 / h;

[0034] (2) Water quality and quantity of reverse osmosis product,

[0035] The water quality of reverse osmosis is better than the requirement of circulating water replenishment, TDS≤500mg / L, and the water volume of reverse osmosis is 28.5m 3 / h;

[0036] (3) Water quality and quantity of evaporation and crystallization condensate,

[0037] The water qua...

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Abstract

The invention discloses a recycling treatment device for desulfurized waste water and a method thereof. The recycling treatment device is characterized according to the characteristics of the desulfurized waste water, i.e., high-hydrochloric-acid inorganic waste water, a membrane treatment technology and an evaporation and crystallization treatment technology are adopted for carrying out the high-efficiency combined design, and the recycling treatment device comprises a pretreatment system, a membrane concentration treatment system and an evaporation and crystallization treatment system. The method comprises the following steps: firstly utilizing lime, sodium carbonate and a weak-acid bed for softening, and filtering by a cross-flow tube type microfiltration membrane, and removing calcium-magnesium ions and heavy-metal pollutants, then utilizing reverse osmosis and electrodialysis to carry out concentrated reduction on pretreated water, and reusing water produced from the reverse osmosis; finally evaporating and crystalizing concentrated liquid of the membrane concentration treatment system, respectively producing sodium sulfate and sodium chloride for recovering, reusing condensed water, thus achieving the purpose of recycling treatment of the desulfurized waste water. The recycling treatment device and the method disclosed by the invention have the advantages that (1) the softening of the lime, the sodium carbonate and the weak-acid bed is thorough; (2) the reverse osmosis and electrodialysis concentration are high-efficiency and the water produced by the reverse osmosis can be reused; (3) the sodium sulfate and the sodium chloride are respectively recovered from evaporation and crystallization; (4) the recycling treatment of the desulfurized waste water is realized.

Description

technical field [0001] The invention relates to a desulfurization wastewater treatment device and a method thereof, and belongs to the technical field of industrial wastewater treatment. Background technique [0002] Power plant flue gas is desulfurized by limestone-gypsum wet method. During the desulfurization process, high-concentration desulfurization wastewater is produced through circulation and concentration. The desulfurization wastewater has a high concentration of suspended solids, Ca 2+ , Mg 2+ , Cl - , SO 4 2- High ion concentration, and contains some heavy metals, fluoride, SiO 2 It is one of the most difficult wastewater to treat at present. [0003] The traditional desulfurization wastewater treatment adopts the "three-box (neutralization, sedimentation, flocculation) - clarification tank" process, by adding lime, organic sulfur, flocculants and coagulants to remove heavy metals and fluorides, making heavy metal pollutants Discharge up to the standard, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
Inventor 张博
Owner 江苏卓博环保科技有限公司
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