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Wastewater zero-discharge process for making acid through purifying activated charcoal fume and system

A technology of flue gas purification and activated carbon, which is applied in the fields of gaseous effluent wastewater treatment, chemical instruments and methods, degassed water/sewage treatment, etc. Complex water quality and other issues to achieve the effects of reducing emissions, improving processing capacity, and saving production costs

Active Publication Date: 2020-02-04
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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  • Wastewater zero-discharge process for making acid through purifying activated charcoal fume and system
  • Wastewater zero-discharge process for making acid through purifying activated charcoal fume and system
  • Wastewater zero-discharge process for making acid through purifying activated charcoal fume and system

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Embodiment approach

[0157] 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:

[0158] A zero-discharge process for acid-making wastewater purified by activated carbon flue gas, comprising the following steps:

[0159] 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.

[0160] 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

[0205] A zero-discharge process for acid-making wastewater purified by activated carbon flue gas, comprising the following steps:

[0206] 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;

[0207] 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;

[0208] 3) Pass the complex acid-making sewage settled in the flocculation-sedimentation tank 203 through the tenth pipeline L10...

Embodiment 2

[0212] 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

The invention relates to a wastewater zero-discharge process for making acid through purifying activated charcoal fume and a system. Acid making complicated sewage is treated sequentially through steps 1) to 4), and the treated water serves as a substitute of industrial new water and is applied to sintering mixing or steel mill cinder flushing. Gases generated in the steps 1) and 2) can be subjected to secondary recycling. Under the action of an acidic dewatering device, sludge generated by an acidic precipitating device will be recovered, and generated acidic filter liquor is recovered through a fifth pipeline. Generated deacidified sludge is recovered through a sixth pipeline. According to the process and the system, processing technologies can be reasonably utilized in view of water body characteristics, the treatment efficiency is increased, the stability of operation is improved, the investment and operating costs are reduced, the difficulty of operating maintenance is lowered, the pollution to air is lowered, and distribution and utilization can be carried out reasonably; and meanwhile, exhaust gases and wastes are recovered and eliminated in the process, so that the production cost can be reduced, and requirements of environmental standards are met.

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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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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