Concave soil adsorption material carrying manganite and method for removing S2- in tannery wastewater

A technology of manganese oxides and adsorption materials, applied in chemical instruments and methods, adsorption water/sewage treatment, animal processing wastewater treatment, etc., can solve the problems of low recovery rate and increased wastewater treatment cost, and achieve simple operation and high treatment effect Significant, high crystal field stabilization energy effect

Active Publication Date: 2013-12-04
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, manganese oxides are powdery solids, and the recovery rate is low, which increases the cost of wastewater treatment, which is one of the reasons why it has not been widely used.
At present, there is no report on the removal of sulfide in tannery wastewater by attapulgite loaded with manganese oxides.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Stir the attapulgite suspension with a mass fraction of 3% for 15 minutes and let it stand for 25 hours. Stir for 15min the next day, adjust the pH to 2 with sulfuric acid solution (1:10); then add 0.2g / mL manganese weak salt solution to the attapulgite suspension, stir for 15min, and adjust to 2 with 4mol / L NaOH pH>9, aging for 15h. Centrifuge and wash until the supernatant is neutral, dry at 105°C for 15 hours, and then grind into granules; calcinate the ground product at 300°C for 3 hours to prepare the manganese oxide / attapulgite composite adsorption material. Add manganese oxide-loaded attapulgite 0.0008 times its mass as an adsorbent in wastewater, adsorb at a temperature of 20°C for 1 hour, then collect manganese oxide-loaded attapulgite, test the solution, and obtain the sulfide removal rate .

Embodiment 2

[0026] Stir the attapulgite suspension with a mass fraction of 5% for 20 minutes and let it stand for 30 hours. Stir for 20min the next day, adjust the pH to 3 with sulfuric acid solution (1:10); then add 0.3g / mL manganese weak salt solution to the attapulgite suspension, stir for 20min, and adjust to 3 with 4mol / L NaOH pH>9, aging for 18h. Centrifuge and wash until the supernatant is neutral, dry at 110°C for 12 hours, and then grind into granules; calcinate the ground product at 400°C for 4 hours to prepare the manganese oxide / attapulgite composite adsorption material. Add manganese oxide-loaded attapulgite 0.001 times its mass as an adsorbent in wastewater, adsorb at a temperature of 25°C for 3 hours, then collect manganese oxide-loaded attapulgite, test the solution, and obtain the sulfide removal rate .

Embodiment 3

[0028] Stir the attapulgite suspension with a mass fraction of 8% for 25 minutes and let it stand for 36 hours. Stir for 25min the next day, adjust the pH to 4 with sulfuric acid solution (1:10); then add 0.4g / mL manganese weak salt solution to the attapulgite suspension, stir for 25min, and adjust to 4 with 4mol / L NaOH pH>9, aging for 25h. Centrifuge and wash until the supernatant is neutral, dry at 115°C for 20 hours, and then grind into granules; calcinate the ground product at 500°C for 5 hours to prepare the manganese oxide / attapulgite composite adsorption material. Add manganese oxide-loaded attapulgite 0.002 times its mass as an adsorbent in the waste water, adsorb at a temperature of 30°C for 4 hours, then collect the manganese oxide-loaded attapulgite, test the solution, and obtain the sulfide removal rate .

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Abstract

The invention discloses a concave soil adsorption material carrying manganite and a method for removing S2- in tannery wastewater. First, a certain amount of concave soil water dispersion liquid going through special pre-treatment is prepared, and then a certain amount of manganese weak acid salt solution is added. Reaction occurs on proper conductions, and the concave soil adsorption material carrying manganite can be obtained after centrifugation, drying, grinding and calcination. A good adsorption effect can be achieved as long as a small number of adsorption materials are placed in tannery wastewater. According to the adsorption materials, preparation conditions are moderate, raw materials can be obtained easily. Moreover, when used for removing S2- in tannery wastewater, the adsorption materials are remarkable in adsorption effect and favorable to subsequent treatment of tannery wastewater, improves recovery rate, reduces cost for wastewater treatment, is incapable of generating bad influence on subsequent treatment, has the advantages of being efficient and protecting the environment, and has good application value.

Description

technical field [0001] The invention belongs to the technical field of tannery wastewater treatment, in particular to an attapulgite adsorption material loaded with manganese oxides and the removal of S in tannery wastewater. 2- Methods. Background technique [0002] The tanning process requires the consumption of a variety of inorganic and organic raw materials with different properties to make finished products from raw hides, resulting in a large amount of complex and high-concentration wastewater. Due to the large amount of biodegradable organic matter in wastewater, the leather industry widely uses biological treatment technology to treat it. However, in the dehydration and liming section of tanning, the sulfur in the wastewater (mainly S 2- ) up to 1000 mg / L or more, sulfides entering the biological treatment will affect the settling performance of activated sludge, making it difficult to separate solid and liquid, thus affecting the quality of water, which serious...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/30C02F1/28C02F103/24
Inventor 林炜王春华苏帝翰穆畅道
Owner SICHUAN UNIV
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