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Application of straw biomass charcoal in processing electroplating wastewater

A biochar and electroplating wastewater technology, applied in water/sewage treatment, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as difficult disposal and secondary pollution

Inactive Publication Date: 2012-02-15
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods are effective, they will produce solid waste residue containing heavy metals, which is difficult to carry out subsequent disposal and easily causes secondary pollution

Method used

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  • Application of straw biomass charcoal in processing electroplating wastewater
  • Application of straw biomass charcoal in processing electroplating wastewater
  • Application of straw biomass charcoal in processing electroplating wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Effects of biochar prepared at different temperatures on acid and copper removal from wastewater.

[0022] Preparation of biochar from air-dried peanut stalks under anaerobic conditions of 300°C, 400°C, and 500°C [see utility model patent: 201020683459.3 and references: Yuan, J.H., Xu, R.K., Zhang, H. 2011. The forms of alkalis in the biochar produced from crop residues at different temperatures. Bioresource Technology 102: 3488-3497], collected the pickling wastewater produced by electroplating copper in an electroplating factory in Nanjing. Add biochar to wastewater at a ratio of 4g / L-28g / L, mix straw biochar that has passed through a 60-mesh sieve with acid wastewater in the reaction tank, stir continuously for 2 hours, let stand for 8 hours, and then stir for 0.5 After standing still for 1.5 hours, the mixed solution was separated from the biochar through a sand filter device, and the clear liquid was discharged. The pH of the solution and the copper content in the ...

Embodiment 2

[0025] Comparison of removal of acid and copper in electroplating wastewater by peanut straw charcoal, soybean straw charcoal, rapeseed straw charcoal and rice straw charcoal.

[0026] According to the method in Example 1, air-dried peanut straw, soybean straw, rapeseed straw and rice straw were subjected to anaerobic pyrolysis at 400° C. to prepare corresponding biochar. Mix the straw biochar passed through a 60-mesh sieve with the electroplating wastewater in Example 1 at a ratio of 4g / L to 32g / L, stir continuously for 2 hours, let stand for 8 hours, stir for another 0.5 hours, and let stand for 1.5 hours , the mixed liquid was separated from the biochar by a sand filter device, the clear liquid was discharged, the pH and copper content of the filtrate were measured, and the effect of removing acid and copper by the straw biochar at the same time was investigated. image 3 It is the pH of the filtrate after the reaction of four kinds of straw biochar and electroplating waste...

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Abstract

The invention discloses an application of straw biomass charcoal in processing electroplating wastewater. The straw biomass charcoal is prepared by anaerobic pyrolysis of peanut straw, soybean straw and rape straw obtained after harvesting at the temperature of 400-500 DEG C, wherein, the added proportion of the straw biomass charcoal is 12-32 g in per liter of electroplating wastewater. The application of the straw biomass charcoal in simultaneously removing acid and heavy metal copper from the electroplating wastewater comprises the following steps: mixing the straw biomass charcoal sieved with 60-mesh sieve with acidic waste water in a reaction tank, continuously stirring for 2 h, standing for 8 h, stirring again for 0.5 h, standing for 1.5 h, and then separating biomass charcoal from the mixed liquor through a sand filtration device, discharging the clear liquid, drying the biomass charcoal obtained after processing waste water, and carrying out incineration. The method has the advantages of low price, high efficiency, and no generation of secondary pollution.

Description

[0001] technical field [0002] The invention belongs to the technical field of sewage purification and treatment containing heavy metals, and relates to the neutralization of acid solution in the pickling wastewater of electroplating industry and the removal of heavy metal copper by using biomass charcoal prepared by low-temperature carbonization of crop straws. Wastewater purification technology for secondary pollution. [0003] Background technique [0004] In the electroplating industry, after the metal forms a coating on the surface of the plated parts, it needs to be washed with strong acid to remove the free metal ions on the surface, so a large amount of acidic wastewater containing heavy metals will be produced. The battery industry and metal mining and smelting processes also produce a large amount of acid wastewater containing heavy metals. If these acidic wastewaters are directly discharged without treatment or are not treated up to standards, they will cause s...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F1/62C02F1/58
Inventor 徐仁扣佟雪娇
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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