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Acidic flue gas washing wastewater zero-discharge treatment method and apparatus thereof

A zero-emission, flue gas technology, applied in gaseous effluent wastewater treatment, degassed water/sewage treatment, gas treatment, etc., can solve the problems of increasing dry ash viscosity, sticking bags in dust collectors, inability to volatilize ammonia nitrogen, etc. The effect of blocking equipment, low dust viscosity and protecting the environment

Active Publication Date: 2019-08-16
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is a conventional wastewater drying treatment process, and obviously cannot be directly used for the treatment of acidic washing wastewater
If this method first directly adjusts the wastewater to high alkalinity, since the acidic washing wastewater often contains elemental sulfur, if it is not removed in advance, the elemental sulfur will be dissolved into sodium thiosulfate, and finally decomposed into sulfur during drying, causing equipment blockage
In addition, if the above method adjusts the wastewater to neutrality during drying, the ammonia nitrogen in the wastewater cannot be volatilized, and ammonium sulfate or ammonium bisulfate is easily formed during drying, which increases the viscosity of the dry ash and causes the dust collector to stick to the bag.

Method used

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  • Acidic flue gas washing wastewater zero-discharge treatment method and apparatus thereof
  • Acidic flue gas washing wastewater zero-discharge treatment method and apparatus thereof
  • Acidic flue gas washing wastewater zero-discharge treatment method and apparatus thereof

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Embodiment 1

[0147] Such as Figure 4 As shown, a zero-discharge treatment device for acidic flue gas washing wastewater or a device for the method described in the first or second embodiment, the device includes a wet scrubbing device 1, an acidic filtration device 2, and a flocculation and sedimentation device 3 , atomizer 4, flue gas pipeline L1 and dust collector 5. The acid flue gas is transported to the feed port of the wet scrubbing device 1 . The liquid outlet of the wet scrubbing device 1 is connected to the acid filter device 2 . The liquid outlet of the acid filter device 2 is connected to the flocculation sedimentation device 3 . The liquid outlet of the flocculation and sedimentation device 3 is connected to the atomizer 4 . The atomizer 4 is connected to the flue gas duct L1. The flue gas pipe L1 is connected to the dust collector 5 .

Embodiment 2

[0149] Repeat embodiment 1, just this device comprises oxidation device 9, adsorption tower 10 and desorption tower 11. The multi-pollutant flue gas is transported to the adsorption tower 10 through the flue gas delivery pipeline L1. The adsorbent outlet of the adsorption tower 10 is connected to the desorption tower 11 . The SRG gas outlet of the analysis tower 11 is connected to the feed port of the wet scrubbing device 1 through a pipeline. The liquid outlet of the wet scrubbing device 1 is connected to the acid filter device 2 . The liquid outlet of the acid filter unit 2 is connected to an oxidation unit 9 . The outlet of the oxidation device 9 is connected to the flocculation and sedimentation device 3 . The plant includes a metal recovery unit 8 . The solid outlet of the flocculation and sedimentation device 3 is connected to a metal recovery device 8 . The solid outlet of the acid filter device 2 is connected to the adsorbent inlet of the adsorption tower 10 . Th...

Embodiment 3

[0151] Such as Figure 5 As shown, a zero-discharge treatment device for acidic flue gas washing wastewater, the device includes a wet scrubbing device 1, an acidic filtration device 2, a flocculation sedimentation device 3, a high alkali ammonia removal device 6 and a condensation crystallization device 7. The acid flue gas is transported to the feed port of the wet scrubbing device 1 . The liquid outlet of the wet scrubbing device 1 is connected to the acid filter device 2 . The liquid outlet of the acid filter device 2 is connected to the flocculation sedimentation device 3 . The liquid outlet of the flocculation sedimentation device 3 is connected to a high alkali ammonia removal device 6 . The liquid outlet of the high alkali ammonia removal device 6 is connected to a condensation crystallization device 7 .

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Abstract

The invention provides an acidic flue gas washing wastewater zero-discharge treatment method, which comprises: removing suspended matters from wastewater through acid filtration; removing metal ions through flocculation precipitation; recovering fluorine, chlorine and other substances and removing organic substances through drying; or recovering ammonia-containing by-products through a high alkaliammonia removing process, and recovering fluorine, chlorine and other substances through condensation crystallization. According to the present invention, the method can effectively treat acidic washing wastewater, achieve the reduction of heavy metal hazardous waste and the cleaning treatment and reuse of ammonia nitrogen, avoid the equipment blockage caused by elemental sulfur, and achieve thezero discharge of wastewater and the low viscosity of dust, and cannot produce bag pasting phenomenon; and resources are recovered and reused, and the environment is protected.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a treatment method and device for acidic flue gas washing wastewater. It belongs to the field of resource and environment protection. Background technique [0002] Sulfur dioxide is one of the main air pollutants in my country, with an annual emission of nearly 20 million tons, causing serious waste of sulfur resources and air pollution such as acid rain and smog. With the increasingly stringent national environmental laws, regulations and standards, the realization of sulfur dioxide emission reduction and recovery has become a major issue that urgently needs breakthroughs in the field of environmental protection. As an important chemical raw material, sulfuric acid is widely used in industrial production. However, my country's sulfur resources are relatively short, and sulfuric acid has been in short supply for a long time. After the sulfur resource in sulfur dioxide is convert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10B01D53/04B01D53/18C02F103/18
CPCB01D53/04B01D53/18B01D2258/0283C02F1/001C02F1/02C02F1/20C02F1/32C02F1/4672C02F1/52C02F1/66C02F1/72C02F1/725C02F9/00C02F2103/18
Inventor 杨本涛魏进超孙英李俊杰
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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