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A modified volcanic rock adsorbent and electroplating wastewater treatment method

A technology for electroplating wastewater and volcanic stone, which is applied in adsorption water/sewage treatment, metallurgical wastewater treatment, water/sludge/sewage treatment, etc., can solve the problems of no ideal method for heavy metals, low adsorption efficiency, and high treatment cost. The modification method is simple and feasible, the treatment effect is stable, and the manufacturing cost is low.

Inactive Publication Date: 2015-10-21
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

New technology for purifying electroplating wastewater from bran: bran is a kind of waste produced in the process of flour processing. This production waste is used as an adsorbent to purify the wastewater containing a large amount of metals produced in the production process of electroplating industry, but the adsorption efficiency is not very high ; New technology for microbial treatment of electroplating wastewater: This technology is obtained from electroplating sludge and wastewater with high-efficiency composite functional bacteria to remove metals to treat electroplating wastewater. The amount of sludge is very small, and the water quality after treatment without secondary pollution is better than the national and International sewage discharge standards, but the treatment cost is high and the effect is unstable
Therefore, in addition to applying clean production and circular economy technologies to curb the use and discharge of heavy metals from the source, there is no industry-accepted ideal method for treating heavy metals in electroplating wastewater.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1. Preparation of modified adsorbent

[0015] Add 105g of natural volcanic stone powder and 2.6g of p-toluenesulfonic acid into a 1000ml three-necked flask, and then add toluene. The amount of toluene is based on just immersing the volcanic stone powder particles. Stir at 200rpm for 12 hours at room temperature; heat to 60℃ Add 200ml of ethyl orthosilicate at a rate of 10mL / min to carry out the sol-gelation reaction, continue to stir until the solution becomes a solid phase, wash the solid phase with distilled water until the mass remains unchanged, and dry at 110°C for 2 hours to obtain the modified Volcanic stone gel.

[0016] Place 50 g of 2-chloromethylpyridine, 50 g of modified volcanic stone gel and 150 g of methanol in a reactor, and stir at 65° C. and 200 rpm for 20 hours to obtain amber particles. Wash the amber particles with distilled water until the quality remains unchanged, and then dry at 60°C until the quality remains unchanged. After grinding, sieving throu...

Embodiment 2

[0026] Take 0.1g, 0.3g, 0.5g, 1.0, 1.5g, 2.0g of the modified volcanic stone adsorbent in Example 1 and add them to 100mL of zinc-plating and chromium-plating mixed wastewater, adjust the pH to 6.0, and operate at 220 rpm at room temperature Stir at a rate of 4 hours, filter with suction, remove the filter residue, and analyze and detect the heavy metal chromium by Shimadzu AA-6200 atomic spectrophotometer. Calculate the adsorption rate, and the results are shown in Table 2.

[0027] Table 2

[0028] Adsorbent dosage (g)

[0029] It can be seen from Table 2 that the ratio of the amount of adsorbent to electroplating wastewater is 0.3-0.5g: 100mL, which can not only get a good treatment effect, but also the amount of adsorbent is relatively economical.

Embodiment 3

[0031] Take 0.5 g of the modified volcanic stone adsorbent prepared in Example 1 and mix it with 100 ml of galvanized and chromium-plated mixed wastewater, a total of five parts, respectively, adjust the PH value of 3.0, 5.0, 6.0, 7.0, 8.0, 9.0, at 25 ℃ at 220 rpm Stir for 4 hours; after the reaction, the solution was centrifuged, and the supernatant was taken into a small test tube, and analyzed and detected on the Shimadzu AA-6200 atomic spectrophotometer to determine the heavy metal chromium content. The calculation results of the adsorption rate are shown in Table 3.

[0032] table 3

[0033] pH value

[0034] It can be seen from Table 3 that during the pH change from acidic to alkaline, the adsorption effect is best when the pH is 6.0-7.0.

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Abstract

The invention relates to a modified vesuvianite adsorbent and an electroplating wastewater treatment method. The modified vesuvianite adsorbent is characterized in that a preparation method of the modified vesuvianite adsorbent comprises the following steps: adding vesuvianite powder and para-toluenesulfonic acid into methylbenzene, and stirring at the rotation speed of 200-300rpm at room temperature; heating to be at 55-65 DEG C, adding 180-220ml of tetraethoxysilane at 8-12mL / min, continuously stirring until the solution is changed to be in a solid phase; washing the solid phase with distilled water until the mass is constant, and drying at 100-120 DEG C for 1.5-2.5h to obtain modified vesuvianite gel; and mixing 2-chloromethylpyridine, the modified vesuvianite gel and methanol, stirring at the rotation speed of 200-300rpm at 60-70 DEG C to obtain amber particles, washing the amber particles with distilled water until the mass is constant, drying at 55-65 DEG C until the mass is constant, grinding, and sieving with a 80-100 mesh screen to obtain the modified vesuvianite adsorbent. The modified vesuvianite adsorbent is low in manufacture cost and is simple and practicable in modifying method, and the modified adsorbent has high adsorption rate (up to more than 99%) of chromium in electroplating wastewater and has high efficiency and stable treatment effect.

Description

Technical field [0001] The invention relates to an adsorbent for wastewater treatment and a method for treating electroplating wastewater, in particular to a modified volcanic stone adsorbent and a method for treating electroplating wastewater. Background technique [0002] Electroplating wastewater contains many heavy metal ions, such as chromium, iron, zinc, cadmium, lead, copper, nickel, etc. Because these ions are difficult to degrade and destroy, and are discharged into the environment, they can be enriched in fish and other aquatic organisms and in crop tissues. Set, through the role of drinking water and food chain, to produce more extensive and more serious harm to humans. Therefore, electroplating wastewater needs to be treated before it can be discharged. [0003] At present, the treatment methods for electroplating heavy metal wastewater mainly include chemical reduction precipitation method, ion exchange method, electrochemical reduction method and evaporation recovery...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/10B01J20/30C02F1/28C02F101/22C02F103/16
Inventor 彭革万丽娟
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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