Cadmium-containing wastewater treatment method

A treatment method and wastewater technology, which are applied in the fields of energy wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of inability to recycle cadmium, high operating costs, frequent regeneration, etc.

Inactive Publication Date: 2013-04-03
WUXI SUNTECH POWER CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ferrite method and activated carbon adsorption method cannot achieve the recycling of cadmium, and the ferrite method consumes a lot of energy
Single ion exchange method, the resin is easily polluted or oxidized, the regeneration is frequent, and the operating cost is high

Method used

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  • Cadmium-containing wastewater treatment method

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Experimental program
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Effect test

Embodiment 1

[0052] Get the first cadmium-containing wastewater 200mL, adjust the pH value to 8.0, add 0.067mL of 30% H 2 o 2 , so that the concentration is 0.01%, the reaction temperature is controlled at 35°C, and the precipitate settles naturally. After settling wastewater, the supernatant was filtered and the pH was adjusted back to 7.0 with hydrochloric acid, and then passed through the 50cm long at a flow rate of 5ml / min. The anion and cation exchange column is filled with large pore size styrene-based cation exchange resin and strong basic quaternary ammonium type I anion exchange resin respectively. The cadmium content in the effluent is 0.0126mg / L.

[0053] Take 200mL of the second waste water, adjust the pH value to 8.5 with NaOH, add Na under stirring 2 S, sedimentation and natural settlement. After settling wastewater, the supernatant was filtered and the pH was adjusted back to 7.0 with hydrochloric acid, and then passed through the 50cm long at a flow rate of 5ml / min. T...

Embodiment 2

[0056] Take the first cadmium-containing wastewater 1800L, adjust the pH value to 8.5, add 1.2L of 30% H 2 o 2 , so that H in the wastewater after adjustment 2 o 2 The concentration is 0.02%, the reaction temperature is controlled at 40°C, and the precipitate settles naturally. After settling wastewater, the supernatant was filtered and the pH was adjusted back to 7.0 with hydrochloric acid, and then passed through the 50cm long at a flow rate of 25ml / min. The anion and cation exchange column is filled with large pore size polystyrene cation exchange resin and strong basic quaternary amine type I anion exchange resin respectively. The cadmium content in the effluent is 0.0039mg / L, and the sulfur content is not detected.

[0057] Get the second waste water 1800L, adjust the pH value to 8.5 with NaOH, add Na under stirring 2 S, sedimentation and natural settlement. After settling wastewater, the supernatant was filtered and the pH was adjusted back to 7.0 with hydrochloric...

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Abstract

The present invention provides a cadmium-containing wastewater treatment method, which comprises the following steps that: (1) cadmium-containing wastewater generates CdS, and precipitate separation is performed; and (2) the precipitate-separated wastewater is subjected to an anion and cation exchange treatment. According to the wastewater treated by the method, a cadmium content in the effluent is controlled to less than 0.03 mg/L, is far less than the national emission standard, and effective cadmium recovery is achieved with the whole process; although the primary treatment adopts the CdS precipitation method, sulfur is recycled through the ion exchange column in the secondary treatment so as not to introduce the contamination ion sulfur to the water, and the precipitation process does not adopt any flocculants, such that the treated cadmium precipitate dehydration solid is easily recycled.

Description

technical field [0001] The invention relates to a method for treating cadmium-containing wastewater and effectively recovering cadmium, which belongs to the cadmium-containing wastewater treatment technology. Background technique [0002] Cadmium is a toxic heavy metal. If people drink cadmium-contaminated water and food for a long time, they will cause chronic cadmium poisoning and diseases such as high blood pressure, emphysema, loss of smell, atrophy and ulcer of nasal mucosa, and osteomalacia. The "bone pain disease" that shocked the world occurred in the Toyama Jinzugawa River Basin in Japan, which is a typical cadmium pollution disease. [0003] The main sources of traditional cadmium-containing wastewater include: electroplating factories, battery factories, cadmium sulfide production plants, zinc-lead concentrate smelting plants, and sponge cadmium production plants. The treatment methods mainly adopt chemical precipitation method, ferrite method, activated carbon a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01G11/00C01G11/02C02F1/42C02F101/20
CPCY02W10/37
Inventor 牛学鹏杜晓华杨培
Owner WUXI SUNTECH POWER CO LTD
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