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Desulfurated wastewater treatment method and device

A desulfurization wastewater and treatment method technology, applied in the direction of gaseous effluent wastewater treatment, multi-stage water treatment, water/sewage treatment, etc., can solve the problems of high hardness of desulfurization wastewater, inability to reuse, environmental hazards, etc., to ensure circulation The effects of stable operation, reduced operating costs, and high recovery rate

Pending Publication Date: 2019-01-15
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Desulfurization wastewater has high hardness, contains a large amount of suspended solids, has high salt content, and also contains certain heavy metal ions. Direct discharge will cause great harm to the environment.
[0003] At present, most of the domestic only use the traditional three-box treatment system (ie neutralization, flocculation, sedimentation treatment) to treat desulfurization wastewater. Although the suspended solids and heavy metal ions in the desulfurization wastewater have been removed, it is still high-salt and high-hardness wastewater, which cannot be processed. Reuse

Method used

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  • Desulfurated wastewater treatment method and device

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Experimental program
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Effect test

Embodiment 1

[0093] At present, a thermal power plant in Shaoxing has about 25 tons of desulfurization wastewater per hour that needs advanced treatment. Now with the processing capacity of every batch of 0.5t to the desulfurization wastewater treatment device provided by the invention (as figure 1 shown) to design, install and debug, and then carry out a pilot test on the desulfurization wastewater of the plant, as follows:

[0094] The salt content in the effluent of the three-box desulfurization wastewater of the plant is about 27000ppm, the calcium ion content is about 4500ppm, and the magnesium ion content is about 700ppm;

[0095] 0.5t of the triple box effluent of the above-mentioned desulfurization waste water enters the dosing reaction sedimentation tank 1 through a submersible pump, and adds 15kg of sodium sulfate, 2kg of milk of lime (concentration is 4wt%) and flocculant (to ensure that the content of flocculant in the system is about 5ppm) , stirred and mixed for 30min, and t...

Embodiment 2

[0103] Carry out pilot test to desulfurization waste water in embodiment 1 equally, specifically as follows:

[0104] The salt content in the effluent of the three-box desulfurization wastewater of the plant is about 27000ppm, the calcium ion content is about 4500ppm, and the magnesium ion content is about 700ppm;

[0105] 0.5t of the three-box effluent of the above-mentioned desulfurization wastewater is entered into the dosing reaction sedimentation tank 1 through a submersible pump, and 15kg of sodium sulfate, 2kg of milk of lime (concentration is 5wt%) and flocculant (to ensure that the content of flocculant in the system is about 5ppm) is added. , stirred and mixed for 30min, and then carried out precipitation treatment for 4h; after the precipitation treatment was completed, the resulting supernatant (calcium ion content was about 2000ppm) entered the filtration unit 2 for filtration treatment (specifically, ultrafiltration treatment was adopted, during which the Produce...

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Abstract

The invention relates to the technical field of wastewater treatment, in particular to a desulfurated wastewater treatment method and device. The treatment method utilizes sodium sulfate and lime milkto remove hard matter, and the operation cost is reduced. The features of different nano filter membranes are utilized to conduct retention on various kinds of ions step by step, not only is separation of materials ensured, but also the safe stability of the system is guaranteed, the scaling risk in the nano filtration process is avoided, and a sodium chloride salt solution with the high purity is finally obtained on the water producing side; meanwhile, the reasonable backflowing process is conducted, the cyclic stable operation and the integral high recycling rate of the system are ensured;and low energy consumption is achieved while tap water is highly concentrated by using a combined technology of reverse osmosis concentration and electroosmosis concentration, and the reverse osmosisfresh water generated by the combined membrane system can be reused for production. The treatment device of desulfurated wastewater is reasonable in treatment unit configuration, operates stably, is high in automation degree, and is suitable for scale treatment of desulfurated wastewater.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a treatment method and device for desulfurization wastewater. Background technique [0002] The desulfurization wastewater comes from the flue gas desulfurization system of coal-fired power plants. The main reason is that alkaline substances are added to the desulfurization system to absorb sulfur dioxide in the flue gas, and the waste water generated during the circulation process needs to be concentrated. Desulfurization wastewater has high hardness, a large amount of suspended solids, high salt content, and certain heavy metal ions. Direct discharge will cause great harm to the environment. [0003] At present, most of the domestic only use the traditional three-box treatment system (ie neutralization, flocculation, sedimentation treatment) to treat desulfurization wastewater. Although the suspended solids and heavy metal ions in the desulfurization wastewater hav...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F103/18
CPCC02F9/00C02F1/001C02F2103/18C02F1/4693C02F1/441C02F1/442C02F2301/08
Inventor 吴雅琴林英杰张宏张高旗张邢伟余涛
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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