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A method of using redox mediator to promote the fermentation of excess sludge to produce acid

A technology of excess sludge and mediator, which is applied in the field of sludge treatment and disposal in sewage treatment plants in environmental protection, to achieve the effects of increasing activity, increasing the amount of acid produced by fermentation, and accelerating the rate of acid production

Active Publication Date: 2017-02-15
杭州微净科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the promotion effect of RM on the process of fermentative acid production has rarely been reported in the literature.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The redox mediator used is AQDS, and adding AQDS to the NaOH solution with a pH of 10 is prepared into an AQDS stock solution with an AQDS concentration of 1.0 g / L; the remaining sludge comes from a city sewage treatment plant in Hangzhou, Zhejiang Province The sludge (after dehydration) has a TSS content of 138 g / L.

[0020] Add 217 mL of excess sludge to both fermenter R0 (effective volume 3.0 L) and fermenter R1 (effective volume 3.0 L), and then make up 3.0 L with distilled water. At this time, the remaining sludge TSS in the fermenter is 10 g / L; the remaining sludge in the fermenter was first stirred at 30 rpm for 1 h, and then 1.5 mL of AQDS stock solution was quickly added to fermenter R1, and the concentration of AQDS in the fermentation system was 0.5 mg / L. Fermenter R0 was used as a control group without adding AQDS stock solution. In the fermentation tank R0 and the fermentation tank R1, the fermentation temperature is controlled at 15°C, the pH value of th...

Embodiment 2

[0023] The redox mediator used is AQS, and adding AQS in the KOH solution that pH is 12 is mixed with the AQS stock solution that AQDS concentration is 5.0g / L; The sludge (after dehydration) has a TSS content of 138 g / L.

[0024] Add 870 mL of excess sludge to both fermenter R0 (effective volume 3.0 L) and fermenter R1 (effective volume 3.0 L), and then make up 3.0 L with distilled water. At this time, the TSS in the fermenter is 40 g / L; The remaining sludge in the fermenter was first stirred at 60 rpm for 6 h, and then 12 mL of AQS stock solution was quickly added to the fermenter R1. At this time, the concentration of AQDS in the fermentation system was 20 mg / L. Fermenter R0 was used as a control group without adding AQS stock solution. In the fermentation tank R0 and fermentation tank R1, the fermentation temperature is controlled at 35°C, the pH value of the fermentation system is adjusted to 9.0 with KOH solution, and the oxidation-reduction potential is controlled at -1...

Embodiment 3

[0027] The redox mediator used was menaquinone, Ca(OH) at pH 10 2 The solution was prepared into a 50 g / L mechanone stock solution; the excess sludge was derived from the biochemical treatment process excess sludge of a starch factory sewage treatment station in Hangzhou, and the TSS content was 65 g / L.

[0028] Add 1385 mL of excess sludge to both fermenter R0 (effective volume 3.0 L) and fermenter R1 (effective volume 3.0 L), and then make up 3.0 L with distilled water. At this time, the TSS in the fermenter is 70 g / L; The remaining sludge in the fermenter was first stirred at 100 rpm for 2 h, and then 15 mL of methionine stock solution was quickly added to R1. At this time, the concentration of methionone in the fermentation system was 100 mg / L. Fermentation tank R0 was used as a control group without adding methaquinone stock solution. In fermentor R0 and fermenter R1, the fermentation temperature is controlled at 25°C, the pH of the fermentation system is maintained at 8...

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Abstract

The invention discloses a method for promoting production of fermentation acid from remaining sludge by utilizing redox mediator. The method comprises the steps of stirring the remaining sludge by an underflow stirrer for 1-6h at the stirring speed of 30-100rpm under anaerobic conditions, adding redox mediator stock solution to enable the concentration of redox mediator in a fermentation system to be 0.5-200mg / L and performing production of fermentation acid in a fermentation tank or an anaerobic reactor; the fermentation conditions are as follows: the fermentation temperature is controlled to be 15-35 DEG C, the pH value of the fermentation system is regulated to 6.0-12.0, the redox potential is controlled to be below -100mV, the underflow stirrer is adopted for stirring, the stirring speed is set to be 50-200rpm and the fermentation time is 3-30d. The remaining sludge can be directly mixed with redox mediator without alkali, hot alkali or ultrasonic pretreatment and volatile fatty acids can be fast and efficiently produced by controlling the operation conditions disclosed by the invention.

Description

technical field [0001] The invention belongs to the field of sludge treatment and disposal in sewage treatment plants in environmental protection, and in particular relates to a method for promoting fermentation and acid production of excess sludge by using redox mediators. Background technique [0002] Sewage treatment plants are one of the important means to reduce pollutant discharge, control water pollution, and improve regional water environment quality. However, in the process of sewage treatment, a large amount of excess sludge will be produced. After being dehydrated by the belt filter press, centrifugal dehydrator or plate and frame filter press in the sewage plant, it will form a gelatinous substance with a moisture content of about 80%. Large, perishable, odorous, high physical stability, high content of organic matter and nitrogen, phosphorus and other nutrients. Therefore, it is necessary to reduce, stabilize and harmlessly treat excess sludge, and to maximize ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P7/40C12P7/54C12P7/52
Inventor 黄进刚姚志通陈建军韩伟
Owner 杭州微净科技有限公司
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