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Rapid method for removing chromium in waste water

A waste water, fast technology, applied in the direction of chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of long treatment time, high cost, small adsorption capacity, etc., achieve wide sources, reduce treatment costs, and protect the environment friendly effect

Active Publication Date: 2009-01-21
JINDUICHENG MOLYBDENUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods all have the disadvantages of cumbersome equipment and high cost, and the treatment effect is not ideal
[0003] In recent years, the United States, Japan, China, etc. have studied the use of environmental minerals to treat chromium-containing wastewater, such as CN 200510035580.9, CN 99109634.7, and CN 03147583.3, which use pyrite / pyrite to treat chromium-containing wastewater. Although the materials used are cheap and easy to obtain, there are also Excessive dosage, small adsorption amount, long processing time and other disadvantages, although some can be used again, they will eventually fail due to surface deposition and clogging

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Crush 50 grams of ferrous sulfide, pass through a 300-mesh sieve, put it into a closed container, add 200ml of water, adjust the pH to 6, stir, boil, add 5 grams of THPS after 1 hour, stir, and heat to dissolve at 80°C; when the liquid level drops , When the solid-liquid weight ratio is 1:1, stop heating, filter, and the filtrate is the chromium removal agent.

[0019] Take 0.3ml of this chromium removal agent, add 200mg / l, 100ml, pH=3 into chromium-containing wastewater, immediately produce yellow precipitate, let stand, pour out the supernatant, adjust pH=6, measure the total Cr concentration<0.5mg / l, up to the standard discharge.

Embodiment 2

[0021] Crush 50 grams of monoclinic pyrrhotite, pass through a 300-mesh sieve, put it into a closed container, add 200 ml of water, adjust the pH to 5, stir, boil, add 10 grams of THPS after 1 hour, stir, and heat to dissolve at 90 ° C; When the liquid level drops and the solid-liquid weight ratio is 1:2, stop heating, filter, and the filtrate is the chromium removal agent.

[0022] Take 0.2ml of this chromium-removing agent, add 150mg / l, 100ml, pH=4 into chromium-containing wastewater, immediately produce yellow precipitate, let it stand, pour out the supernatant, adjust pH=6, measure the total Cr concentration<0.5mg / l, up to the standard discharge.

Embodiment 3

[0024] Crush 50 grams of pyrite, pass through a 300-mesh sieve, put it into a closed container, add 250ml of water, adjust the pH to 4, stir, boil, add 15 grams of THPS after 1 hour, stir, and heat to dissolve at 95°C; when the liquid level drops , When the solid-liquid weight ratio is 1:2, stop heating, filter, and the filtrate is the chromium removal agent.

[0025] Take 0.15ml of this chromium removal agent, add 100mg / l, 100ml, pH=5 into chromium-containing wastewater, immediately produce yellow precipitate, let it stand, pour out the supernatant, adjust pH=6, measure the total Cr concentration<0.5mg / l, up to the standard discharge.

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PUM

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Abstract

A method for quick removal of chromium from waste water relates to a method for the treatment of waste water or sewage, in particular to a method for preparing a quick chromium removing agent for the treatment of chromium-containing waste water. The method takes iron sulfide as a chromium removing agent, and is characterized in that the chromium removing process comprises the following steps that (1) iron sulfide is crushed and sieved by a 300 mesh sieve, and the sieved fine powder is taken out; (2) water is added in the fine powder obtained at step (1), and the paste is mixed till solid-liquid weight ratio is between 1 to 3 and 1 to 4; moreover, pH value is adjusted to between 4 and 6 and then the paste is stirred and boiled; (3) tetrakis hydroxymethyl phosphonium sulfate (THPS) is added in the solution obtained at step (2) with the adding quantity accounting for 0.1 to 0.4 of the weight of iron sulfide solid, and then the mixture is stirred and heated to 80 to 95 DEG C; (4) heating is stopped when solid-liquid weight ratio is between 1 to 1 and 1 to 2, and then filtration is carried out to obtain solid and filtrate; and (5) the filtrate obtained at step (4) is used as a chromium removing agent, and is added in waste water to remove chromium. The chromium removing agent has the advantages of simple preparation method, cheap raw materials and extremely strong treatment capacity and excellent treatment effect on chromium-containing waste water.

Description

technical field [0001] The invention relates to a rapid chromium removal method for waste water, which relates to a fast chromium removal method for treating waste water or sewage, especially waste water containing chromium. Background technique [0002] At present, the following methods are mainly used for chromium-polluted wastewater: (1) chemical precipitation method, which is divided into neutralization precipitation method and sulfide precipitation method; (2) redox treatment, which is divided into chemical reduction method , ferrite method and electrolysis method; (3) solvent extraction separation method; (4) adsorption method; (5) membrane separation technology; (6) ion exchange method; (7) biological treatment method. The above-mentioned methods all have the disadvantages of complicated equipment and high cost, and the treatment effect is not ideal. [0003] In recent years, the United States, Japan, China, etc. have studied the use of environmental minerals to trea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/62C02F1/28C02F101/22
Inventor 唐军利
Owner JINDUICHENG MOLYBDENUM CO LTD
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