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Acid-making sewage treatment system and method

A technology of sewage treatment system and sewage treatment method, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of acid sewage without recycling, waste of metal elements, acid sewage The level of pollution should not be underestimated, etc.

Inactive Publication Date: 2014-10-01
HUNAN SHUI KOU SHAN NONFERROUS METALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the acid-making sewage produced by smelting flue gas acid-making contains heavy metal pollutants such as arsenic and fluorine. If this part of sewage is discharged directly, it will seep into the ground with surface runoff and rainfall runoff, causing huge pollution to surface water. The degree of pollution of acidic sewage cannot be underestimated; in addition, the direct discharge of this part of sewage will cause a huge waste of valuable metal elements
The existing technology does not recycle the acidic sewage produced by smelting flue gas acid production, resulting in a waste of resources

Method used

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  • Acid-making sewage treatment system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Pump 600 tons of acid-making sewage in the water inlet tank to the neutralization tank. The hardness of the acid-making sewage is 1000, the pH value is 0.5, and the temperature is 60°C; add lime milk and lime milk to the neutralization tank Ca(OH) in2 The massfraction of is 5%, and described milk of lime will be 9 with the pH value control in the barrel;

[0069] Discharge the sewage generated in the neutralization barrel to the first sewage concentration tank for concentration to obtain the first filtrate and the first waste residue, recycle the first waste residue, transport the first filtrate to the softening barrel, and add industrial soda ash to the softening barrel for about 750kg, control the pH value of the sewage in the neutralization barrel to 8;

[0070] Concentrate the softened sewage through the second sewage concentration tank for 30 minutes to produce a second filtrate and a second waste residue, recover the second waste residue, and transport the second ...

Embodiment 2

[0074] Pump 500 tons of acid-making sewage in the water inlet tank to the neutralization tank. The hardness of the acid-making sewage is 1500, the pH value is 0.5, and the temperature is 58°C; add lime milk and lime milk to the neutralization tank Ca(OH) in 2 The mass fraction is 5%, and the pH value of the sewage in the neutralization barrel is controlled at about 9.5 by the milk of lime;

[0075] Discharge the sewage generated in the neutralization barrel to the first sewage concentration tank for concentration to obtain the first filtrate and the first waste residue, recycle the first waste residue, transport the first filtrate to the softening barrel, and add industrial soda ash to the softening barrel for about 650kg, control the pH value of the sewage in the softening bucket to be around 8.5;

[0076] Concentrate the softened sewage through the second sewage concentration tank for 30 minutes to produce a second filtrate and a second waste residue, recover the second was...

Embodiment 3

[0080] Pump 700 tons of acid-making sewage in the water inlet tank to the neutralization tank. The hardness of the acid-making sewage is 1100, the pH value is 0.5, and the temperature is 61°C; add lime milk to the neutralization tank, and the lime milk Ca(OH) 2 The mass fraction is 5%, and the pH value in the neutralization barrel is controlled at about 9.2 by the milk of lime;

[0081] Discharge the sewage generated after the neutralization tank to the first sewage concentration tank for concentration to obtain the first filtrate and the first waste residue, recycle the first waste residue, and transport the first filtrate to the softening tank in the sewage softening area to soften Add about 850kg of industrial soda ash into the barrel, and control the pH value of the sewage softening zone between 8 and 9;

[0082] Concentrate the softened sewage through the second sewage concentration tank for 30 minutes to produce a second filtrate and a second waste residue, recover the ...

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Abstract

The invention provides an acid-making sewage treatment system. The acid-making sewage treatment system comprises a water inlet pool with a water inlet, a sewage neutralization device communicated with the water inlet pool, a first sewage concentration pool communicated with the sewage neutralization device, a sewage softening device communicated with the first sewage concentration pool, a second sewage concentration pool communicated with the sewage softening device, a first reuse water pool communicated with the second sewage concentration pool, a cooling water device communicated with the first reuse water tank, and a second reuse water pool communicated with the cooling water device and provided with a water outlet. Compared with the prior art, the acid-making sewage treatment system can recycle arsenic and fluoride ions in acid-making sewage, can reduce hardness of the acid-making sewage, and can reduce the temperature of the acid-making sewage, so that the sewage can realize cyclic utilization. The invention further provides an acid-making sewage treatment method which is simple and efficient.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an acid-making sewage treatment system and an acid-making sewage treatment method. Background technique [0002] Sulfuric acid is one of the important products in the chemical industry. With the development of social economy, many industries such as metallurgy, petroleum, national defense, machining, etc., as well as departments such as medicine and enamel, have an increasing demand for sulfuric acid. The production process of sulfuric acid is also increasing. It has gradually developed. In the smelting of non-ferrous metals, since most of the raw materials are metal sulfides, a large amount of SO which is harmful to the environment will be produced during smelting. 2 , and when SO in flue gas 2 If the concentration is higher than 3.5%, it can be made into sulfuric acid through a certain process. The use of smelting flue gas to make acid can not only reduce the pollutio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 于红卫
Owner HUNAN SHUI KOU SHAN NONFERROUS METALS GRP
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