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Chromium-containing wastewater treatment method capable of realizing zero emission of pollutants

A treatment method and technology for chromium wastewater, applied in the fields of water pollutants, water/sewage treatment, neutralized water/sewage treatment, etc., can solve the problems of waste of chromium resources, unstable treatment effect and high treatment cost, and reduce the operation cost. Cost and investment cost, easy control of operating parameters, simple effect of processing methods

Active Publication Date: 2015-02-18
武汉武钢绿色城市技术发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical precipitation method needs to add a large amount of chemical agents to treat chromium-containing wastewater, which not only has high treatment costs, but also has unstable treatment effects. The total chromium and Cr in the effluent 6+ Sometimes it exceeds the standard; the chromium sludge generated during the treatment process is a first-class dangerous substance, which will cause secondary pollution to the environment
At the same time, the existing treatment methods cannot achieve clean production, and chromium resources are wasted as waste
In addition, this method has problems such as the difficulty in stably discharging waste water up to the standard, the inability to reuse the treated water, and the difficulty in the disposal and recycling of chromium sludge.

Method used

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  • Chromium-containing wastewater treatment method capable of realizing zero emission of pollutants
  • Chromium-containing wastewater treatment method capable of realizing zero emission of pollutants

Examples

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Effect test

Embodiment 1

[0026] 1) at 150m 3 In the chromium wastewater collection pool of the cold rolling water station, the chromium-containing wastewater is filtered and then entered into the liquid storage tank, and the pH value is adjusted to 8-11 at room temperature. Put it into the HLMK-CR1 adsorption reactor filled with DK110 weakly acidic cation exchange resin, carry out ion exchange and adsorption of substances other than chromium, and convert the chromium ions in the wastewater into hexavalent chromium;

[0027] When the conductivity of the effluent water from the HLMK-CR1 adsorption reactor is close to the target value (such as <300μs / cm), it will be transferred to the regeneration program, and the residual liquid in the adsorption reactor will be emptied (return to the collection pool), and in the upper part of the adsorption reactor Add compressed air to dry it, first rinse the DK110 weakly acidic cation exchange resin with treated effluent, then add a mass fraction of 5% sulfuric acid ...

Embodiment example 2

[0034] 1) at 150m 3 The waste water is taken from the chromium waste water collection tank and enters the filter. At normal temperature, the filtered chromium-containing waste water is first adjusted to a pH value of 8-11, and then ion-exchanged with a 724-type weakly acidic cation exchange resin to absorb substances other than chromium ( To ensure the purity of chromium in the chromium-containing wastewater), and to convert the chromium ion into hexavalent chromium in the wastewater, the 724 type weakly acidic cation exchange resin is eluted and regenerated with a mass fraction of 7% sulfuric acid solution (2BV adsorbent volume), and the resulting regeneration solution and post-treatment emissions;

[0035] 2) At normal temperature, adjust the pH value of the chromium-containing wastewater treated with weakly acidic cation exchange resin to 8-11, and then perform ion exchange with polystyrene resin containing imidazole structure to absorb chromium ions in the wastewater. Tot...

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Abstract

The invention discloses a chromium-containing wastewater treatment method capable of realizing zero emission of pollutants. The method comprises the following steps: adjusting the pH value of filtered chromium-containing wastewater to 8-11, adsorbing substances except chromium in the chromium-containing wastewater through weak-acidity cation exchange resin, enabling chromium ions in the wastewater to be converted to hexavalent chromium, eluting resin for regenerating, and neutralizing and then discharging regenerated liquid; adjusting the pH value to 8-11, performing ion exchange through strong-alkalinity anion exchange resin, adsorbing chromium ions in the wastewater, and eluting the resin through a sodium hydroxide solution so as to obtain a sodium chromate solution; performing sodium removal through strong-acidity cation exchange resin so as to obtain a chromic acid solution; neutralizing and discharging regenerated liquid after the resin is eluted for regenerating. The treatment method is simple and easy to control, no secondary pollution in the treatment process is generated, and meanwhile, cleaning production is realized; the discharged water is the chromic acid solution and can be recycled, so that recycling application is realized, and zero emission of wastewater and pollutants is realized; the recycle treatment and running cost and the investment cost are reduced greatly.

Description

technical field [0001] The invention relates to resource recycling of chromium-containing waste liquid, in particular to a treatment method for zero discharge of chromium-containing waste water pollutants. Background technique [0002] The phenomenon of heavy metal pollution in my country is very serious. Chromium-containing wastewater is a typical heavy metal wastewater, which has the characteristics of large water volume, complex water quality, and strong toxicity. At the beginning of 2011, the State Council passed the "Twelfth Five-Year Plan for Comprehensive Prevention and Control of Heavy Metal Pollution". 15%. In the iron and steel industry, in order to improve the corrosion resistance of cold-rolled sheets such as plated sheets and color-coated sheets and the adhesion to paint films, chromate passivation treatment processes are generally used. This process produces a large amount of Cr-containing wastewater. Chromium-based, hexavalent chromium is easier for the body...

Claims

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Application Information

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IPC IPC(8): C02F1/42C02F1/62
CPCC02F1/001C02F1/42C02F1/66C02F9/00C02F2001/422C02F2001/425C02F2101/22
Inventor 吴启兵刘汉杰吴高明杜健敏张道权
Owner 武汉武钢绿色城市技术发展有限公司
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