A method for co-fermentation of henna plant biomass and excess sludge to produce acid

A plant biomass and excess sludge technology, applied in fermentation and other directions, can solve the problems of low organic matter content in excess sludge and low application rate of anaerobic digestion technology, and achieve simultaneous reduction, good environment and economic benefits, The effect of increasing acid production by fermentation

Inactive Publication Date: 2016-07-06
浙江金环宝生物技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The organic content of surplus sludge in my country is relatively low, resulting in a low application rate of anaerobic digestion technology in the treatment and disposal of surplus sludge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The Henna plant biomass used is from a certain place in Anhui Province. The leaf components are selected and crushed by a pulverizer and screened through 20 meshes to take the sieve and dried at 50°C for later use; the remaining sludge is from a certain place in Hangzhou, Zhejiang Province The residual sludge (after dehydration) of the municipal sewage treatment plant has a volatile suspended solids (VSS) content of 138g / L.

[0020] Add 84g of Henna plant biomass and 261mL of remaining sludge into the fermentor (effective volume 3.0L), and then make up 3.0L with distilled water. At this time, the total amount of VSS in the mixed solution is 40g / L, and the dry weight percentage of Henna plant biomass is 70%. In the control group of the surplus sludge single fermentation system, 870mL of surplus sludge was added; in the Henna plant biomass single fermentation system, 120g of the Henna plant biomass and 20mL of surplus sludge were added. The fermentation temperature in the f...

Embodiment 2

[0022] The Henna plant biomass used is from a certain place in Anhui Province. The stem components are selected and crushed by a pulverizer and screened through 10 meshes to remove the sieve and dried at 50°C for use; the remaining sludge is from Hangzhou, Zhejiang Province The remaining sludge (after dehydration) of a municipal sewage treatment plant in Beijing has a VSS content of 138g / L.

[0023] Add 18g of Henna plant biomass and 522mL of remaining sludge into the fermenter (effective volume 3.0L), and then make up 3.0L with distilled water. At this time, the total amount of VSS in the mixed solution is 30g / L, and the dry weight percentage of Henna plant biomass is 20%. In the control group of the surplus sludge single fermentation system, 652 mL of surplus sludge was added; in the Henna plant biomass single fermentation system, 90 g of the Henna plant biomass and 15 mL of surplus sludge were added. The fermentation temperature in the fermenter is controlled to be constant a...

Embodiment 3

[0025] The henna plant biomass used comes from a certain place in Xinjiang, and the flower is selected as the used component. After being crushed by a pulverizer, it is sieved through 50 meshes, and then dried at 70°C for later use; the remaining sludge is from Hangzhou, Zhejiang A mixture of the remaining dewatered sludge from a municipal sewage treatment plant and the remaining sludge from a biochemical treatment process at a starch plant sewage treatment station in Hangzhou. The volume ratio of the two types of sludge is 1:1, and the VSS content is 86g / L.

[0026] Add 5.25g of Henna plant biomass and 2168mL of remaining sludge into the fermenter (effective volume 3.0L), and then make up 3.0L with distilled water. At this time, the total amount of VSS in the mixed solution is 35g / L, and the dry weight percentage of Henna plant biomass is 5%. In the control group of the surplus sludge single fermentation system, 1220 mL of surplus sludge was added; in the Henna plant biomass sin...

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Abstract

The invention discloses a method for producing acid through the co-fermentation of Henna plant biomass and excess sludge. The method comprises the following steps of uniformly mixing Henna plant biomass with excess sludge so as to obtain a mixture with 5-70% of Henna plant biomass powder ; and then, putting the mixture into a fermentation tank or an anaerobic reactor to carry out co-fermentation, wherein the co-fermentation conditions are as follows: the fermentation temperature is controlled at 15-55 DEG C, the pH value of a fermentation system is maintained at 6.0-11.0 by using a phosphate buffer, a sodium bicarbonate buffer or an alkaline solution, and the redox potential is less than minus 150 mV; an underflow blender with a rotating speed set as 50-300 RPM is adopted, and the fermentation time is 1-30 d. Excess sludge is not required to be subjected to alkali, hot alkali or ultrasonic pretreatment, can be directly mixed with Henna plant biomass, and by controlling the operating conditions, volatile fatty acids can be effectively produced.

Description

Technical field [0001] The invention belongs to the field of sludge treatment and disposal of sewage treatment plants in environmental protection, and specifically relates to a method for co-fermentation and acid production using henna plant biomass and surplus sludge. Background technique [0002] Sewage treatment plants are one of the important means to achieve pollutant emission reduction, control water pollution, and improve regional water environment quality. However, a large amount of surplus sludge will be produced in the process of sewage treatment. After being dehydrated by belt filter press, centrifugal dehydrator or plate and frame filter press in the sewage plant, it will form a gelatinous substance with a water content of about 80%. The basic characteristics are large, perishable, foul-smelling, high physical stability, high content of organic matter and nutrients such as nitrogen and phosphorus. Therefore, the excess sludge must be reduced, stabilized and harmlessl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P7/40
Inventor 黄进刚姚志通陈建军韩伟
Owner 浙江金环宝生物技术有限公司
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