A zero-discharge process and system for activated carbon flue gas purification of acid-making wastewater

A flue gas purification and activated carbon technology, which is applied in gaseous effluent wastewater treatment, chemical instruments and methods, degassed water/sewage treatment, etc. It is difficult to deal with problems such as saving mixing equipment, improving the operation effect of the project, and increasing the operating cost.

Active Publication Date: 2022-02-18
HUNAN ZHONGYE CHANGTIAN ENERGY CONSERVATION & ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, when TISCO Stainless introduced Japanese technology to construct a sintered activated carbon flue gas desulfurization project in 2006, the Japanese said that the water quality of the acid wastewater was complicated and difficult to deal with.
In recent years, in the newly-built activated carbon flue gas desulfurization projects in various places, the acid wastewater treatment system has not operated well

Method used

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  • A zero-discharge process and system for activated carbon flue gas purification of acid-making wastewater
  • A zero-discharge process and system for activated carbon flue gas purification of acid-making wastewater
  • A zero-discharge process and system for activated carbon flue gas purification of acid-making wastewater

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Embodiment approach

[0158] According to the first embodiment of the present invention, there is provided a zero-discharge process of activated carbon flue gas purification of acid-making wastewater:

[0159] A zero-discharge process for acid-making wastewater purified by activated carbon flue gas, comprising the following steps:

[0160] 1) Precipitate the complex acid sewage in the acid precipitation device 1, and the gas generated during the precipitation process passes through the acid gas return air duct L 酸 Enter the acid gas recovery unit 5 for recovery.

[0161] 2) The acid-making complex sewage after being precipitated by the acid precipitation device 1 is sequentially passed into the first neutralization tank 201, the first oxidation tank 202 and the flocculation sedimentation tank 203 of the metal ion precipitation device 2 for metal ion precipitation, and the first neutralization The ammonia gas produced in the tank 201 , the first oxidation tank 202 and the flocculation-sedimentation...

Embodiment 1

[0206] A zero-discharge process for acid-making wastewater purified by activated carbon flue gas, comprising the following steps:

[0207] 1) Precipitate the complex acid sewage in the acid precipitation device 1, and the gas generated during the precipitation process passes through the acid gas return air duct L 酸 Enter acid gas recovery unit 5 to reclaim;

[0208] 2) The acid-making complex sewage after being precipitated by the acid precipitation device 1 is sequentially passed into the first neutralization tank 201, the first oxidation tank 202 and the flocculation sedimentation tank 203 of the metal ion precipitation device 2 for metal ion precipitation, and the first neutralization The ammonia produced in the pond 201, the first oxidation pond 202 and the flocculation sedimentation pond 203 enters the ammonia gas recovery device 6 to reclaim;

[0209] 3) Pass the complex acid-making sewage settled in the flocculation-sedimentation tank 203 through the tenth pipeline L10...

Embodiment 2

[0213] Repeat embodiment 1, just step 2) in, the alkaline bottom sludge that flocculation sedimentation tank 203 produces is passed into bottom sludge de-alkaline dehydration device 8, and the alkaline filtrate that produces in bottom sludge de-alkaline dehydration device 8 passes through the first step. The seven pipelines L7 are recovered, and the dealkalized sludge produced in the bottom sludge dealkaline dehydration device 8 is recovered through the eighth pipeline L8; in step 3), lye is added to the tenth pipeline L10 through the lye replenishing device 304 .

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Abstract

A zero-discharge process and system for activated carbon flue gas purification of acid-making wastewater. The complex wastewater of acid-making is processed through steps 1)-step 4) in sequence. After treatment, it is used as a substitute for industrial fresh water for sintering or steel mills Flushing slag. The gas produced in step 1) and step 2) can be recycled for secondary use. Under the action of the acid dehydration device, the sludge generated by the acid precipitation device will be recycled, and the acid filtrate generated will be recycled through the fifth pipeline. The resulting deacidified sludge is recycled through the sixth pipeline. The solution provided by this application can aim at water quality characteristics, rationally utilize process technology, improve treatment efficiency and operation stability, reduce investment and operation costs, reduce operation and maintenance difficulty, and reduce air pollution at the same time, and can be distributed and utilized reasonably. Recycling and eliminating exhaust gas and waste materials in the process is conducive to reducing production costs and meeting environmental protection standards.

Description

technical field [0001] The invention relates to a sewage treatment process, in particular to a zero-discharge process of activated carbon flue gas purification of acid-making wastewater, and belongs to the technical field of sewage treatment. The present invention also relates to a zero-discharge system for activated carbon flue gas purification of acid-making wastewater Background technique [0002] With the continuous improvement of the country's requirements for the sintering flue gas emission indicators of iron and steel plants, more and more iron and steel plants are currently using activated carbon to purify the sintering flue gas. Sulfur dioxide, nitrogen oxides, dioxins and other harmful substances, the activated carbon after adsorption can generate high-concentration sulfur dioxide desorption gas after high-temperature desorption. In order to realize the resource utilization of sulfur dioxide, sulfur dioxide desorption gas is often used to produce concentrated sulfu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F11/121B01D53/04C01C1/02C02F103/18
CPCC02F9/00C02F11/121B01D53/04C01C1/024C02F2001/007C02F1/66C02F1/72C02F1/52C02F1/444C02F1/20C02F1/001C02F1/586C02F2209/06C02F1/725C02F1/78C02F1/722C02F1/5245C02F2103/18C02F2301/08
Inventor 刘义陈红黄伏根
Owner HUNAN ZHONGYE CHANGTIAN ENERGY CONSERVATION & ENVIRONMENTAL PROTECTION TECH CO LTD
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