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Acid-base neutralization precipitation treatment of iron-containing acid wastewater treatment sludge recovery process

A technology of acid wastewater and precipitation method, which is applied in the oxidation treatment of sludge, water/sludge/sewage treatment, sludge treatment, etc., to achieve the effect of eliminating secondary pollution and promoting coordinated development

Active Publication Date: 2016-01-06
钱占虎
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no feasible and effective method to dispose of this kind of sludge in China. It is necessary to develop a new set of technologies to treat and use these industrial solid wastes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A recovery process for treating sludge produced by acid-base neutralization and precipitation treatment of iron-containing acidic wastewater, comprising the following steps:

[0027] (1) Adjust sludge concentration

[0028] First, concentrate the sludge produced by the treatment of 1 ton of iron-containing acidic wastewater into the sludge thickening tank, and then add an appropriate amount of water to adjust the sludge content to 50%;

[0029] (2) Adjust the pH value of the sludge

[0030] Add an appropriate amount of ammonia water or sodium hydroxide to the above-mentioned adjusted sludge to adjust the pH value of the sludge to 9;

[0031] (3) Oxidation conditioning

[0032] Put the above-mentioned sludge with adjusted pH value into the oxidation tank, and then pour it into the oxidation tank with 0.5m 3 Inject compressed air at a rate of / min for 30 minutes to make the sludge oxidize;

[0033] (4) chemical reaction

[0034] Transfer the oxidized sludge into the ...

Embodiment 2

[0040] A recovery process for treating sludge produced by acid-base neutralization and precipitation treatment of iron-containing acidic wastewater, comprising the following steps:

[0041] (1) Adjust sludge concentration

[0042] First, concentrate the sludge produced by 1 ton of iron-containing acidic wastewater into the sludge thickening tank, and then add an appropriate amount of water to adjust the sludge content to 60%;

[0043] (2) Adjust the pH value of the sludge

[0044] Add an appropriate amount of ammonia water or sodium hydroxide to the above-mentioned sludge with adjusted concentration to adjust the pH value of the sludge to 10;

[0045] (3) Oxidation conditioning

[0046] Put the above-mentioned sludge with adjusted pH value into the oxidation tank, and then pour it into the oxidation tank with 0.8m 3 Inject compressed air at a rate of / min for 55 minutes to make the sludge undergo oxidation reaction;

[0047] (4) chemical reaction

[0048] Transfer the oxi...

Embodiment 3

[0054] A recovery process for treating sludge produced by acid-base neutralization and precipitation treatment of iron-containing acidic wastewater, comprising the following steps:

[0055] (1) Adjust sludge concentration

[0056] First, concentrate the sludge produced by the treatment of 1 ton of iron-containing acidic wastewater into the sludge thickening tank, and then add an appropriate amount of water to adjust the sludge content to 30%;

[0057] (2) Adjust the pH value of the sludge

[0058] Add an appropriate amount of ammonia water or sodium hydroxide to the above-mentioned sludge with adjusted concentration to adjust the pH value of the sludge to 9.5;

[0059] (3) Oxidation conditioning

[0060] Put the above-mentioned sludge with adjusted PH value into the oxidation tank, and then pour it into the oxidation tank with 0.1m 3 Inject compressed air at a rate of / min for 40 minutes to make the sludge oxidize;

[0061] (4) chemical reaction

[0062] Transfer the oxid...

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Abstract

The invention discloses a process for recycling sludge generated in treatment of iron-containing acidic wastewater. The process comprises six working procedures including regulation of sludge concentration and PH values, oxidation quenching and tempering, chemical reaction, solid-liquid separation and drying and dewatering. The process can be used for realizing the resource utilization of the sludge generated in the treatment of the iron-containing acidic wastewater, completely recycling total iron in the sludge, and converting the total iron into iron oxide black which can be directly used for iron and steel smelting; by adopting the process, the secondary pollution of the sludge can be eliminated, the ecological environment can be protected, the sludge can be changed into treasure from waste, and the resource utilization effect of waste recycling can be realized.

Description

technical field [0001] The invention relates to the field of solid waste disposal in the environmental protection industry, in particular to a recycling process for treating sludge generated from iron-containing acid wastewater treatment by an acid-base neutralization precipitation method. Background technique [0002] The iron and steel industry and the metal products industry need to remove the iron scale on the steel surface during the production process and use hydrochloric acid for pickling. After pickling, a large amount of clean water is required for surface washing, which will produce a large amount of iron-containing acidic wastewater. [0003] At present, the iron and steel industry and the metal products industry have become major users of water consumption, as well as major producers of wastewater. The discharge of such waste water in our country is astonishing. According to the statistics of relevant departments, the amount of waste water discharged by key iron ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/06C02F11/12
Inventor 钱占虎
Owner 钱占虎
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