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A kind of acid flue gas washing wastewater treatment method and use thereof

A wastewater treatment and wastewater technology, which is applied in gaseous discharge wastewater treatment, water/sewage treatment, water/sewage multi-stage treatment, etc. It can solve the problems of reducing metal cation and ammonia nitrogen removal rate, and ammonia gas escape.

Active Publication Date: 2021-01-15
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under high alkali conditions, metal cations tend to form stable complexes with ammonia nitrogen, thereby reducing the removal rate of metal cations and ammonia nitrogen.
In addition, the solution is in a state of high alkalinity. Although metal cations can be precipitated, ammonia nitrogen will be converted into free ammonia at high alkalinity, which is conducive to precipitation from the liquid phase and will cause a large amount of ammonia gas to escape.

Method used

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  • A kind of acid flue gas washing wastewater treatment method and use thereof
  • A kind of acid flue gas washing wastewater treatment method and use thereof
  • A kind of acid flue gas washing wastewater treatment method and use thereof

Examples

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Embodiment approach

[0097] According to the second embodiment provided by the present invention, a method for treating acidic flue gas scrubbing wastewater is provided.

[0098] The use of a method for treating acidic flue gas washing wastewater, the method described in the first embodiment is used to treat the acidic flue gas washing wastewater produced by adsorption method adsorbent desorption gas washing. Preferably, the adsorbent comprises solid or liquid. More preferably, the adsorbent is one or more of activated carbon, molecular sieves, MOFs, ionic liquids, and organic amines.

[0099] The following examples are intended to further illustrate the present invention, rather than limit the present invention.

Embodiment 1

[0101] The simulated wastewater is high-suspended-suspended acidic wastewater prepared by carbon powder adsorbed with colloidal sulfur, sulfurous acid, and sulfuric acid. The initial SS concentration is 3000mg / L and pH=0.68.

[0102] 1) Solid-liquid separation:

[0103] Acid precipitation: Add the simulated wastewater into the vertical sedimentation tank, and keep the residence time in the vertical sedimentation tank for 4h. Due to the high density of carbon powder suspended matter, most of it will settle to the bottom of the vertical sedimentation tank and be discharged through the mud pump. The wastewater after passing through the vertical sedimentation tank mainly contains a small amount of small particles of carbon powder, and the SS concentration is 428mg / L;

[0104] Acid filtration: Add the supernatant of the vertical sedimentation tank to an acid-resistant laminated filter with a filter diameter of 1mm; after passing through the acid-resistant laminated filter, the sup...

Embodiment 2

[0110] The simulated wastewater is high-suspended-suspended acidic wastewater prepared by carbon powder adsorbed with colloidal sulfur, sulfurous acid, and sulfuric acid. The initial SS concentration is 3000mg / L and pH=0.68. The total iron in the wastewater is 120mg / L, the total aluminum is 80mg / L, the total calcium is 90mg / L, and the ammonia nitrogen is 15000mg / L.

[0111] 1) adopt the method for solid-liquid separation in embodiment 1 to process;

[0112] 2) Oxidation: Pass the wastewater solution into the oxidation device, so that the organic matter in the wastewater solution undergoes an oxidative degradation reaction, and removes the organic matter in the wastewater;

[0113] 3) The simulated wastewater was prepared by 15% NaOH and 5% Na 2 CO 3 The mixed alkali of composition adjusts the pH of the solution to 8. At this time, it can be observed that a large amount of precipitation can be formed in the solution, and the concentration of free ammonia in the detection solu...

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Abstract

An acid flue gas washing wastewater treatment method includes the following steps: 1) solid-liquid separation: filtering acid flue gas washing wastewater, to obtain a suspended matter sediment and a wastewater solution; 2) oxidation: introducing the wastewater solution into an oxidation device, and carrying out an oxidative degradation reaction on organic matters in the wastewater solution, to remove the organic matters in the wastewater; 3) weak alkaline flocculation: adding a mixed alkali into the wastewater solution after oxidative degradation, adjusting the pH of the wastewater to weak alkaline, and making metal ions form precipitates; and filtering, to obtain a filter residue containing metal ion precipitates and a filtrate ; 4) ammonia removal: transferring the filtrate into a tubular mixer, adding an alkali liquid, and adjusting the pH of the filtrate in the tubular mixer to strong alkaline; and introducing the strong alkaline filtrate into a membrane absorption system, and carrying out ammonia removal. According to the method and the use thereof, the method has the advantages of clean treatment, multi-pollutant control, low treatment cost and high treatment efficiency.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to an acid flue gas washing wastewater treatment method and its application, and 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. [0003] 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 dioxi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F103/18
CPCC02F1/001C02F1/44C02F1/5236C02F1/5245C02F1/66C02F1/72C02F1/725C02F9/00C02F2001/007C02F2103/18
Inventor 杨本涛魏进超肖海娟刘义陈瑶李俊杰李小龙
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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