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Method for conditioning fermentation acid production sludge to raise organic acid recovery by utilization of seed sludge rich in thiobacillus

A technology of sludge and seed sludge, applied in sludge treatment, biological sludge treatment, dehydration/drying/thickened sludge treatment, etc., can solve the problems of large dosage, high cost, loss of organic acids in fermentation liquid, etc. , to achieve high processing efficiency, short processing time, and improve the efficiency of solid-liquid separation

Inactive Publication Date: 2015-09-16
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the sludge dewatering in my country is dominated by chemical methods. Coagulants such as ferric chloride, polyaluminum sulfate or polyaluminum trichloride and coagulants such as lime are mainly added to sludge dewatering to achieve solid-liquid separation, but the dosage Large, not only the cost is high, but also the loss of organic acids in the fermentation broth is serious due to the adsorption of flocculants

Method used

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  • Method for conditioning fermentation acid production sludge to raise organic acid recovery by utilization of seed sludge rich in thiobacillus
  • Method for conditioning fermentation acid production sludge to raise organic acid recovery by utilization of seed sludge rich in thiobacillus
  • Method for conditioning fermentation acid production sludge to raise organic acid recovery by utilization of seed sludge rich in thiobacillus

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Experimental program
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Effect test

Embodiment 1

[0037] Example 1, Preparation of Seed Mud Enriched with Thiobacillus thiooxidans and Thiobacillus ferrooxidans

[0038] Put 250mL of excess sludge obtained from the concentration tank of the sewage treatment plant into a 500mL conical flask, and add 2g / L of Fe at the same time 2+ (FeSO 4 ·7H 2 O, FeS or other reducing iron can also be used) and 2g / L sulfur powder (FeS or other reducing sulfur can also be used). Place the triangular flask in a constant temperature water bath shaker to cultivate and enrich the indigenous strains by shaking, the shaker rotates at 100 rpm, and the temperature is normal or medium temperature, that is, 15-40°C, such as 28°C. When the acidification pH of the sludge drops below 4.5, one cycle ends. The acidified sludge was inoculated into fresh excess sludge at a ratio of 2% (V / V), and cultured under the same conditions until the pH dropped below 4.5. The above steps were repeated three times, and the obtained acidified sludge was used as seed slu...

Embodiment 2

[0039] Embodiment 2, utilize the seed mud conditioning concentration of the present invention to be the fermentation acid production sludge of 40g / L

[0040] The fermented sludge inoculated with the seed sludge prepared in Example 1 was cultured under shaking and aeration conditions. Test with a shaker and an aerator. The effective volume of the reactor is 500mL. Take an appropriate amount of seed sludge and inoculate it into 40g / L of fermented acid-producing sludge. The inoculum volume is 2% (V / V), and add 2g / L LFeSO 4 ·7H 2 O and 2g / L sulfur powder, the cultivation temperature is 15-40°C. Shaker shaking culture, 100rpm, culture 96h. At 24h, the specific resistance of sludge changed from 1.75×10 13 m / kg dropped to 8.66×10 11 m / kg, decreased to 5.01×10 after 96h 11 ( figure 1 ). Under normal pressure filtration, the filtrate recovery rate increased from 0 to 20% ( figure 2 ), the organic acid recovery rate increased to 20.47%.

Embodiment 3

[0041] Embodiment 3, utilize the seed mud conditioning concentration of the present invention to be the fermentation acid production sludge of 20g / L

[0042]The fermented sludge inoculated with the seed sludge prepared in Example 1 was cultured under shaking and aeration conditions. Test with a shaker and an aerator, the effective volume of the reactor is 500mL, take an appropriate amount of seed sludge and inoculate it into 20g / L of fermented sludge, the inoculum volume is 2% (V / V), and add 2g / L of FeSO 4 ·7H 2 O and 2g / L sulfur powder, the cultivation temperature is 15-40°C. Shaker shaking culture, 100rpm, culture 72h. Sludge specific resistance from 9.72×10 12 m / kg down to 3.22×10 12 m / kg( image 3 ). The suction filtration effect of the sludge before conditioning is very poor, and the sludge can form mud cake after suction filtration conditioning ( Figure 4 ), the moisture content is 75.17%. The filtrate is effectively recovered, and under normal pressure filtrat...

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Abstract

The invention provides a method for raising a dehydration property of fermentation acid production sludge. The method comprises steps: first, sludge is provided; second, Fe<2+> and sulfur in a reduction state are added in the sludge, and culture is carried out until the pH value of the sludge is lowered; third, the acidized sludge obtained from the second step is added into fresh sludge, and the second step is repeated; fourth, the third step is repeated for several times and therefore seed sludge is obtained; fifth, the obtained seed sludge is inoculated in fermentation acid production sludge, Fe<2+> and sulfur in a reduction state are added in the fermentation acid production sludge with the inoculated seed sludge, culture is carried out in a mode same as the mode in the second step until the specific resistance of the fermentation acid production sludge is lowered.

Description

technical field [0001] The invention belongs to the field of solid waste resource utilization, especially the field of sludge resource utilization. Specifically, the present invention provides a method for improving the recovery of organic acids by using seed sludge enriched in Thiobacillus thiooxidans and Thiobacillus ferrooxidans to condition and ferment acid-producing sludge. Background technique [0002] Bioconversion of organic waste into bioenergy and biochemicals has become a hot spot in organic solid waste disposal. Acid production from municipal sludge fermentation is a new way of sludge resource utilization. By promoting the hydrolysis of sludge to produce acid and inhibiting the production of methane, the rich organic matter in sludge can be converted into organic acids, which can be used as industrial raw materials. , such as the external carbon source for denitrification and phosphorus removal of domestic sewage, and the economic value of acetic acid, propionic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14C02F11/02
CPCY02W10/20
Inventor 刘和徐晓宇杨硕刘宏波符波
Owner JIANGNAN UNIV
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