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A zero-discharge treatment process and device for desulfurization wastewater

A technology for desulfurization wastewater and treatment process, applied in the field of water treatment, can solve the problems of rising equipment operating costs, falling water flux, and high investment costs, reducing operating and investment costs, reducing uneven problems, and improving treatment efficiency. Effect

Active Publication Date: 2021-11-16
济南上华科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the above-mentioned prior art, there are the following problems: 1. Since there is a certain concentration of silicon in the desulfurization wastewater, and silicon exists in two forms, active silicon and colloidal silicon, it is not easy to be in the process of flocculation and sedimentation If it is removed, it will cause fouling and pollution on the surface of the reverse osmosis membrane and ceramic membrane if it remains in the desulfurization wastewater, resulting in a decrease in water flux and an increase in the operating cost of the equipment; 2. During the desulfurization process, the tail gas still contains a large amount of After the waste heat is directly discharged, it causes a waste of energy; 3. Due to the high unit price of the ceramic membrane itself, the loading amount in a device is much smaller than that of the organic membrane, which makes the investment cost of the ceramic membrane equipment very high. Although It has the advantage of good corrosion resistance, but the high price limits its further application in the field of desulfurization wastewater treatment, which is very concerned about cost

Method used

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  • A zero-discharge treatment process and device for desulfurization wastewater
  • A zero-discharge treatment process and device for desulfurization wastewater
  • A zero-discharge treatment process and device for desulfurization wastewater

Examples

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Effect test

Embodiment 1

[0135] Add flocculants to the desulfurization wastewater. The flocculants are made of polyaluminium chloride and ferrous sulfate according to the weight ratio of 3:2. The amount of flocculants added is 75ppm. The flocculation slag obtained in the process is settled and separated, and then the supernatant is sent to the subsequent carbon dioxide aeration treatment. The temperature of the wastewater during the carbon dioxide aeration process is 20-25°C. The residence time in the aeration tank is 50min; NaOH and NaOH are added to the desulfurization wastewater after aeration treatment 2 CO 3 As a precipitating agent, the amount of NaOH added is converted according to the stoichiometric ratio of completely precipitated magnesium ions, NaOH 2 CO 3 The amount to be added is converted according to the stoichiometric ratio of completely precipitated calcium ions; after the precipitation reaction, the obtained wastewater is sent to a ceramic membrane filter for filtration. The pore s...

Embodiment 2

[0137] Add flocculant in the desulfurization wastewater, the flocculant is ferric chloride, and the amount of flocculant added is 85ppm. After the flocculation treatment, the flocculation slag obtained during the flocculation process is settled and separated in the settling tank, and then the supernatant is sent to Into the subsequent carbon dioxide aeration treatment, the temperature of the wastewater during the carbon dioxide aeration process is 20-25°C, the aperture on the aeration tube used is 0.2mm, and the residence time of the desulfurization wastewater in the aeration tank is 60min; for the aeration treatment Then add NaOH and Na to the desulfurization wastewater 2 CO 3 As a precipitating agent, the amount of NaOH added is converted according to the stoichiometric ratio of completely precipitated magnesium ions, NaOH 2 CO 3 The amount to be added is converted according to the stoichiometric ratio of completely precipitated calcium ions; after the precipitation reacti...

Embodiment 3

[0139] A flocculant is added to the desulfurization wastewater. The flocculant is polyacrylamide, and the amount of flocculant added is 40ppm. Into the subsequent carbon dioxide aeration treatment, the temperature of the wastewater during the carbon dioxide aeration process is 20-25°C, the aperture on the aeration pipe used is 0.5mm, and the residence time of the desulfurization wastewater in the aeration tank is 100min; for the aeration treatment Then add NaOH and Na to the desulfurization wastewater 2 CO 3 As a precipitating agent, the amount of NaOH added is converted according to the stoichiometric ratio of completely precipitated magnesium ions, NaOH 2 CO 3 The amount to be added is converted according to the stoichiometric ratio of completely precipitated calcium ions; after the precipitation reaction, the obtained wastewater is sent to a ceramic membrane filter for filtration. The pore size of the ceramic membrane filter is 200nm, and the operating temperature is 30-3...

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Abstract

The invention relates to a zero-discharge treatment process and device for desulfurization wastewater, belonging to the technical field of water treatment. By adopting a variety of improvement methods, the operating cost of zero-discharge treatment of desulfurization wastewater is effectively reduced. It is mainly reflected in: 1. A co-processing method for desiliconization and decalcification is proposed, which effectively reduces the surface scaling of ceramic membranes and reverse osmosis membranes, reduces the amount of reagents used, improves permeation flux, and reduces costs; 2. Using the waste heat in the exhaust gas, the heat exchange between the ceramic membrane and the water is realized, which effectively improves the operating flux of the ceramic membrane; The loading capacity saves equipment investment cost.

Description

technical field [0001] The invention relates to a zero-discharge treatment process and device for desulfurization wastewater, belonging to the technical field of water treatment. Background technique [0002] At present, the wet desulfurization wastewater treatment system of most thermal power plants in China adopts the traditional chemical dosing flocculation and sedimentation process, but the overall operation rate is very low. The concentration of SS and COD in the desulfurization wastewater treated by the traditional treatment system is high, and the Cl in the water cannot be removed - . Due to the high concentration of Cl - , leading to the inability to recycle the treated wastewater. For the consideration of environmental protection requirements and economic benefits, it is an inevitable trend of wastewater treatment to adopt advanced treatment technology to achieve zero discharge of wastewater. [0003] The wastewater produced by the traditional limestone-gypsum f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C01D5/00C01D3/04C02F103/18
CPCC01D3/04C01D5/00C02F1/38C02F1/441C02F1/442C02F1/52C02F1/60C02F5/02C02F9/00C02F2101/101C02F2103/18Y02P20/129
Inventor 李星吴丹
Owner 济南上华科技有限公司