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A method of using modified steel slag to promote acid production by anaerobic fermentation of excess sludge

A technology of excess sludge and anaerobic fermentation, applied in fermentation, biological sludge treatment, chemical instruments and methods, etc., can solve the problem of low acid production efficiency of sludge anaerobic fermentation, and achieve the promotion of hydrolysis and acidification process, obvious porous structure, the effect of reducing the particle size of sludge

Active Publication Date: 2021-07-27
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the low efficiency of acid production by sludge anaerobic fermentation in the prior art, the present invention provides a modified steel slag prepared by pickling industrial steel slag and loading self-made nano-calcium peroxide on its surface. A method for improving the efficiency of anaerobic fermentation of excess sludge with steel slag

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  • A method of using modified steel slag to promote acid production by anaerobic fermentation of excess sludge
  • A method of using modified steel slag to promote acid production by anaerobic fermentation of excess sludge

Examples

Experimental program
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Embodiment 1

[0031] (1) Preparation of nano calcium peroxide powder:

[0032] Dissolve 2g of calcium chloride in 30mL of distilled water, add 15mL of ammonia water (the concentration of ammonia water used is 2mol / L) and 150mL of polyethylene glycol under magnetic stirring conditions (400rpm), and then add 150mL of polyethylene glycol to the mixture at a rate of 4 drops per minute. 15 mL of H was added dropwise to the solution 2 o 2 solution (the H used in it 2 o 2 Solution concentration is 30%), after stirring for 4 hours, calcium peroxide solution was obtained. Subsequently, adding pH to the calcium peroxide solution is a NaOH solution of 13, and when the pH of the calcium peroxide solution reaches 11, the precipitate is collected by centrifugation, and the centrifugal speed is 6000 rpm, and then it is washed three times with a pH of 13 NaOH solution, and washed twice with distilled water. The product was collected by centrifugation. The product was dried in a vacuum oven at 70° C. f...

Embodiment 2

[0040] (1) Preparation of nano calcium peroxide powder:

[0041] Dissolve 1 g of calcium chloride in 20 mL of distilled water, and add 10 mL of ammonia water (the concentration of ammonia water used is 1 mol / L) and 100 mL of polyethylene glycol under magnetic stirring conditions (300 rpm). Then, 10 mL of H was added dropwise to the mixed solution at a rate of 3 drops per minute 2 o 2 solution, where the H 2 o 2 The concentration of the solution was 20%, and after stirring for 2 hours, a calcium peroxide solution was obtained. Subsequently, NaOH solution with a pH of 12 was added to the calcium peroxide solution, and when the pH of the calcium peroxide solution reached 11, the precipitate was collected by centrifugation at a centrifugation rate of 5000 rpm. After that, it was washed three times with NaOH solution having a pH of 13 and twice with distilled water, and the product was collected by centrifugation. The product was dried in a vacuum oven at 60° C. for 2 h to obt...

Embodiment 3

[0049] (1) Preparation of nano calcium peroxide powder:

[0050] Dissolve 4 g of calcium chloride in 50 mL of distilled water, and add 20 mL of ammonia water (the concentration of ammonia water used is 3 mol / L) and 200 mL of polyethylene glycol under magnetic stirring conditions (500 rpm). Then, 20 mL of H was added dropwise to the mixed solution at a rate of 5 drops per minute 2 o 2 solution (the H used in it 2 o 2 The solution concentration is 50%). After stirring for 5 hours, a calcium peroxide solution was obtained. Subsequently, a NaOH solution with a pH of 13 was added to the calcium peroxide solution, and when the pH of the calcium peroxide solution reached 12, the precipitate was collected by centrifugation at a centrifugation rate of 8000 rpm. After that, it was washed three times with NaOH solution having a pH of 13 and twice with distilled water, and the product was collected by centrifugation. The product was dried in a vacuum oven at 80° C. for 4 h to obtain...

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Abstract

The invention discloses a method for using modified steel slag to promote acid production by anaerobic fermentation of excess sludge. The method comprises: loading nano-calcium peroxide powder with pickling modified steel slag to obtain nano-calcium peroxide-loaded pickling modified For steel slag, put nano-calcium peroxide-loaded acid-washed modified steel slag in a glass bottle, add a certain amount of substrate sludge and inoculation sludge in the glass bottle, feed nitrogen into the glass bottle, and immediately put the The glass bottle mouth is sealed, and then the sealed glass bottle is put into a constant temperature shaker to ferment, and the CaO of the present invention 2 Ca(OH) will be formed in water 2 and H 2 o 2 , the two promote the breaking and hydrolysis of sludge cells, and the joint action of calcium peroxide and steel slag makes the promotion effect of modified steel slag significantly better than that of adding steel slag and calcium peroxide alone.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a method for promoting acid production by anaerobic fermentation of excess sludge by using modified steel slag. Background technique [0002] With the rapid development of social economy and the rapid increase of population, the generation of urban domestic sewage is also increasing day by day. At present, the biological treatment method represented by the activated sludge method has become the most widely used method in urban sewage treatment. The activated sludge method uses the microorganisms existing in the sludge system to complete the degradation of organic matter in sewage, and a large amount of residual sludge rich in organic matter is produced during this process. With the further increase of municipal sludge production, the problem of sludge treatment and disposal has become increasingly prominent. Currently, there are four main methods for sludge treatment: landfill, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/04C12P7/64C02F101/30
CPCC02F11/04C02F2101/30C12P7/6409
Inventor 朱洪涛高小乐张倩倩张盼月
Owner BEIJING FORESTRY UNIVERSITY
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