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Method for treating chromium-containing waste water by utilizing banana skin

A technology of banana peel and banana peel powder, applied in chemical instruments and methods, adsorption water/sewage treatment, reduced water/sewage treatment, etc., can solve the problems of consuming large chemical reagents, increasing production costs, complex processes, etc. Low cost, less secondary pollution and simple process

Inactive Publication Date: 2012-07-04
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the chemical reduction method has a good effect on the treatment of chromium-containing wastewater, the process is complex and requires a large amount of chemical reagents. These chemical reagents are expensive, increase production costs, and easily cause secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step 1. Take a certain amount of banana peel powder with a particle size of 0.1 cm, wash it twice with deionized water, put it into a drying oven at 105°C, dry it, cool it to room temperature, and set aside;

[0024] Step 2. Take 5g of banana peel powder dried in step 1 and 50mL of 2% solidification solution (gelatin and chitosan), mix well to form a mixed solution, and then add 50mL of the mixed solution with a concentration of 0.1mol / Cacl of L 2 solution, mix evenly to form a mixture, and then make the mixture into 2mm particles for later use;

[0025] Step 3. Add all the mixture particles with a particle size of 2 mm in step 2 to 50 mL of Cacl with a concentration of 0.1 mol / L 2 solution, let it stand for 12 hours, then take it out, wash it twice with deionized water, filter, and dry to prepare the reducing adsorbent for subsequent use;

[0026] Step 4: Mix 5 g of the reducing adsorbent prepared in Step 3 with 500 mL of chromium-containing wastewater with a concen...

Embodiment 2

[0030] Step 1. Take a certain amount of banana peel powder with a particle size of 0.3cm, wash it twice with deionized water, and then put it into a drying oven at 105°C, dry it, cool it to room temperature, and set aside;

[0031] Step 2. Take 10g of banana peel powder dried in step 1 and 100mL of 2% solidification solution (gelatin and sodium alginate), mix well to form a mixed solution, and then add the mixed solution to 100mL with a concentration of 0.1mol / Cacl of L 2 In the solution, mix evenly to form a mixture, and then make the mixture into 4mm particles for later use;

[0032] Step 3. Add all the mixture particles with a particle size of 4 mm in step 2 to 100 mL of Cacl with a concentration of 0.1 mol / L 2 solution, let it stand for 12 hours, then take it out, wash it twice with deionized water, filter, and dry to prepare the reducing adsorbent for subsequent use;

[0033] Step 4: Mix 10 g of the reducing adsorbent prepared in step 3 with 500 mL of chromium-containing...

Embodiment 3

[0037] Step 1. Take a certain amount of banana peel powder with a particle size of 0.5 cm, wash it twice with deionized water, put it into a drying oven at 105°C, dry it, cool it to room temperature, and set it aside;

[0038] Step 2. Take 20g of banana peel powder dried in step 1 and 200mL of 2% solidified solution (sodium alginate and chitosan), mix well to form a mixed solution, and then add the mixed solution to 200mL with a concentration of 0.1 mol / L of Cacl 2 In the solution, mix evenly to form a mixture, and then make the mixture into 5mm particles for later use;

[0039] Step 3. Add all the mixture particles with a particle size of 5 mm in step 2 to 200 mL of Cacl with a concentration of 0.1 mol / L 2 solution, let it stand for 12 hours, then take it out, wash it twice with deionized water, filter, and dry to prepare the reducing adsorbent for subsequent use;

[0040] Step 4: Mix 20 g of the reducing adsorbent prepared in step 3 with 500 mL of chromium-containing waste...

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Abstract

The invention relates to a method for treating chromium-containing waste water by utilizing banana skin. Banana skin powder is washed and dried and then is mixed with a solidified liquid, and a Cacl2 solution is added to form a mixture, so as to prepare particles; the particles are added into the Cacl2 solution, standing is carried out for 12 hours, the particles are taken out and washed for twice, filtering and drying are carried out, the prepared reduction adsorbent is uniformly mixed with the chromium-containing waste water, wherein the mass ratio of hexavalent chromium to the reduction adsorbent in the waste water is 1:200, the pH value is regulated to 4, and reaction is carried out for 4-6 hours; reacted waste water is fed into a centrifugal machine; the concentration of hexavalent chromium ions in centrifuged supernate is less than 0.5mg / L, the total chromium ion concentration is less than 1.5mg / L, the precipitate after centrifugation is uniformly mixed with hydrochloric acid, the mixture is fed into an oscillator, desorption is carried out for 4-6 hours, the desorbed mixed solution is fed into the centrifugal machine, and separation is carried out to obtain a trivalent chromium ion solution and a waste reduction adsorbent. The method provided by the invention has the advantages of low cost, good treatment effect, simple process, mild reaction condition, capability of recycling trivalent chromium, less secondary pollution, and the like.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a method for treating chromium-containing wastewater by using banana peels. Background technique [0002] In metallurgy, electroplating, printing and dyeing, tanning and other industrial production processes, a large amount of chromium-containing wastewater will be produced, and the main pollutant in these wastewater is hexavalent chromium. Hexavalent chromium is extremely harmful to human health. It can convert human hemoglobin into methemoglobin, interfere with the oxidation, reduction and hydrolysis process in the body, and cause serious harm to the digestive tract, respiratory tract, skin and mucous membranes. Under certain conditions, even It can induce cancer, and it is a type of pollutant stipulated in the "Integrated Wastewater Discharge Standard" GB8978-1996. It must be treated and discharged only after reaching the standard. At present, the main methods for treating ...

Claims

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Application Information

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IPC IPC(8): C02F1/70C02F1/28C02F101/22
Inventor 周鸣朱书法许景明刘亚纳汤红妍朱青菊
Owner HENAN UNIV OF SCI & TECH
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