Method for preparing chemical leakage accident adsorbents from excess activated sludge

A technology of residual activity and chemicals, applied in chemical instruments and methods, sludge treatment, other chemical processes, etc., can solve the problems of high cost, environmental pollution, etc., and achieve the effect of sufficient raw materials, easy access to materials, and low prices

Inactive Publication Date: 2015-12-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem of high cost and environmental pollution in the prior art, and a new method for preparing chemical leakage accident adsorbent from excess activated sludge is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Fully mix 150g of crushed remaining activated sludge with 375mL of 2mol / L NaOH aqueous solution, seal and impregnate for 24 hours, then place it in an electric heating box at 110°C for 24 hours at a constant temperature, take it out, wash it until pH = 7, and dry it for later use. Grind the dried residual activated sludge after alkali heat treatment to 40 meshes, take the ground residual activated sludge and fully mix 8g and 30mL of phosphoric acid solution with a mass solubility of 38%, and place the fully mixed material at 200 ℃ air pre-oxidation in a drying oven for 6h, and then cool down naturally. The pre-oxidized material was heated up to 800°C at a rate of 5°C / min under a nitrogen atmosphere, carbonized and activated at a constant temperature for 2 hours, and taken out after natural cooling. After washing with distilled water at 100°C until pH = 7, an activated carbon adsorbent with developed pore size and high mesoporosity can be prepared. Activated carbon adso...

Embodiment 2

[0020] Fully mix 150g of crushed remaining activated sludge with 375mL of 2mol / L NaOH aqueous solution, seal and impregnate for 24 hours, then place it in an electric heating box at 110°C for 24 hours at a constant temperature, take it out, wash it until pH = 7, and dry it for later use. Grind the dried residual activated sludge after alkali heat treatment to 40 meshes, take the ground residual activated sludge and fully mix 8g and 30mL of phosphoric acid solution with a mass solubility of 25%, and place the fully mixed material at 160 ℃ air pre-oxidation in a drying oven for 6h, and then cool down naturally. The pre-oxidized material was heated up to 800°C at a rate of 5°C / min under a nitrogen atmosphere, carbonized and activated at a constant temperature for 2 hours, and taken out after natural cooling. After washing with distilled water at 100°C until pH = 7, activated carbon with developed pore size and high mesoporosity can be produced. Activated carbon adsorbent is used...

Embodiment 3

[0022] Fully mix 150g of crushed remaining activated sludge with 375mL of 2mol / L NaOH aqueous solution, seal and impregnate for 24 hours, then place it in an electric heating box at 110°C for 24 hours at a constant temperature, take it out, wash it until pH = 7, and dry it for later use. Grind the dried residual activated sludge after alkali heat treatment to 40 meshes, take the ground residual activated sludge and fully mix 8g and 30mL of phosphoric acid solution with a mass solubility of 25%, and place the fully mixed material at 160 ℃ air pre-oxidation in a drying oven for 6h, and then cool down naturally. The pre-oxidized material was heated up to 900°C at a rate of 5°C / min under a nitrogen atmosphere, carbonized and activated at a constant temperature for 2 hours, and taken out after natural cooling. After washing with distilled water at 100°C until pH = 7, activated carbon with developed pore size and high mesoporosity can be produced. Activated carbon adsorbent is used...

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Abstract

The invention relates to a method for preparing chemical leakage accident adsorbents from excess activated sludge, and mainly solves the problems of higher cost and environment pollution in the prior art. According to the method for preparing the chemical leakage accident adsorbents from the excess activated sludge, crushed excess activated sludge with the moisture content being lower than 60 percent and alkali liquor are subjected to sealing steeping after being mixed and are then put into an electric heating box for constant temperature heating; the mixture is taken out and is then washed until the pH is 6 to 8; then, drying is carried out; the dried excess activated sludge is ground; the ground excess activated sludge and a phosphoric acid solution are mixed; the mixed solution is put into a drying box to be subjected to air pre-oxidation; the excess activated sludge subjected to pre-oxidation is subjected to temperature rise under the nitrogen gas atmosphere for carbonization and activation; the excess activated sludge subjected to carbonization and activation is taken out after the temperature is lowered; after washing, the chemical leakage accident adsorbents are obtained. Through the technical scheme, the problems are better solved, and the method can be used for preparing the chemical leakage accident adsorbents.

Description

technical field [0001] The invention relates to a method for preparing an adsorbent for chemical leakage accidents from surplus activated sludge. Background technique [0002] Since the 1960s, there have been many sudden chemical environmental pollution accidents around the world, such as the Rhine River pollution incident in 1986, the Danube River pollution incident in 2000, and the Songhua River pollution incident in 2005. These sudden environmental pollution accidents not only caused huge economic losses, but also brought huge disasters to the environment, human health, society and economic development. Therefore, the emergency treatment technology for sudden chemical environmental pollution accidents has attracted great attention from governments all over the world. In addition to actively carrying out how to prevent and predict the occurrence of sudden environmental disasters, people have also carried out technical research on emergency disposal of leaked chemicals and...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F11/00
Inventor 张宏哲牟桂琴郭亚逢唐晓丽张志远
Owner CHINA PETROLEUM & CHEM CORP
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