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Method for preparing volatile fatty acid with high solid concentration organic castoff heat-alkali preprocessing post anaerobic fermentation

A technology of volatile fatty acids and high solid concentration, which is applied in the field of organic solid waste recycling, can solve the problems of unoptimistic economic benefits and low added value of products, and achieve shortened fermentation cycle, high production intensity and high conversion rate Effect

Inactive Publication Date: 2008-12-03
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This technology uses organic materials like refractories or metals from industrial wastes such as household garbage or medical waste into useful products with added benefits over existing methods. It also helps recover valuable resources during landfills cleaning processes.

Problems solved by technology

This patented technical problem addressed by this patents relates to finding ways to efficiently dispose of organics that may have negative environmental effects when they end up being buried underground without proper management measures. Biological methods can help break down these materials more effectively while minimizing their impact upon soil quality and water resources.

Method used

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  • Method for preparing volatile fatty acid with high solid concentration organic castoff heat-alkali preprocessing post anaerobic fermentation
  • Method for preparing volatile fatty acid with high solid concentration organic castoff heat-alkali preprocessing post anaerobic fermentation
  • Method for preparing volatile fatty acid with high solid concentration organic castoff heat-alkali preprocessing post anaerobic fermentation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The pH of the prepared urban sludge mixture with a solid mass concentration of 7.4% was adjusted to 12.0, sealed and placed at 90° C. for 2 hours with slow stirring for pretreatment. After pretreatment, 10g of VS / L anaerobic acidified seed slime that had been subjected to heat stress treatment and domestication was added, filled with nitrogen for 3 minutes, sealed, and fermented at 35°C for 10 days, using a shaking table for fermentation at a speed of 120r / min. The pH of the fermentation process was controlled at 10. The unpretreated municipal sludge was prepared to the same solid concentration, the pH was not controlled during the fermentation process, and the rest of the fermentation conditions were the same as those of the pretreated sludge. A comparison of acid production from municipal sludge without pretreatment and pretreatment figure 1 and figure 2 . Compared with untreated, the total acid production increased by 61.0% after pretreatment, and the acid produc...

Embodiment 2

[0019] The municipal sludge mixed solutions with solid mass concentrations of 3.7%, 5.0%, 7.4%, 9.0% and 12.0% were prepared respectively. Pretreatment conditions and anaerobic fermentation acid production conditions are the same as in Example 1. The process change of total acid production under different solid mass concentration conditions is shown in image 3 . The volatile fatty acid yield of the pretreated municipal sludge with a solid mass concentration of 7.4% was the highest, and compared with other solid mass concentrations, the yield increased by 18.7%-51.1%.

Embodiment 3

[0021] Prepare a solid mass concentration of 7.4% urban sludge mixture. The pretreatment conditions are the same as in Example 1. Then, 10 g VS / L of domesticated seed mud was inserted, filled with nitrogen for 3 minutes, sealed, and fermented at 35° C. for 10 days, and fermented on a shaking table at a speed of 120 r / min. The pH of the fermentation process was controlled at 8, 9, 10, 11 and 12, respectively. Under different pH conditions, the process change of total acid production is shown in Figure 4 . The total acid production was the highest when the fermentation process was at pH 10. Compared with other pH conditions, the acid production increased by 4.5%-236.8%.

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Abstract

The invention relates to a method for generating volatile fatty acid through anaerobic fermentation after the heat-caustic pretreatment is performed to organic waste with high solid concentration, and belongs to the field of the organic solid waste resource. The invention takes municipal sewage sludge as model substrate to conduct heat-caustic pretreatment, and then anaerobic acidification sludge after being treated in a heat stress and domesticated is taken as seed sludge to perform anaerobic fermentation. The solid quality concentration of the treated municipal sewage sludge can be 3.7 to 12.0 percent, the maximal productivity of the volatile fatty acid can reach 0.23g, and the organic matter in per gram of volatile fatty acid is increased by 20.1 to 61.0 percent compared with the fermentation acid with sludge which is not be pretreated. The method transfers organic matters in the solid waste, in particular, organic matter biology which is hard to degrade, to a product with economic value; the quantitative reduction of the organic solid waste is promoted; the problem that the environmental contamination caused by the solid waste is solved to some extent; the equipment for pre-treatment and fermentation process is simple; the operation is convenient; and the method has the advantages that the cost is low, the conversion rate is high, the fermentation period is short, and the production intensity is high.

Description

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Claims

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Application Information

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Owner JIANGNAN UNIV
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