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Acid producing fermentation tank for treating kitchen wastes and producing carbon source

A technology for acid-producing fermentation and kitchen waste, applied in specific-purpose bioreactor/fermenter, bioreactor/fermenter combination, biomass post-processing, etc. environment and high cost, to achieve the effect of high suitability, low cost and improved effect

Inactive Publication Date: 2014-06-04
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the core reaction equipment of the anaerobic fermentation acid production process of food waste, the acid production fermentation tank should have the characteristics suitable for anaerobic fermentation acid production, while traditional fermentation equipment is mostly used for biopharmaceuticals, methane production, hydrogen production, etc., and it is difficult to produce suitable The unique reaction environment of acid and the problem of high cost hinder the direct application of traditional fermentation equipment to the anaerobic fermentation acid production project of food waste

Method used

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  • Acid producing fermentation tank for treating kitchen wastes and producing carbon source
  • Acid producing fermentation tank for treating kitchen wastes and producing carbon source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1 (sequential batch type)

[0026] The solid content rate of raw food waste is 15%, the concentration of organic acid in the supernatant of food waste before fermentation is 625mg / L, the COD content is 71g / L, and the operating condition of the acid-producing fermentation tank is set at 35.0°C. The pH is 6.0, the stirring speed is 125rpm, the ultrasonic pulse generator is turned off, and the acid-producing fermentation tank is operated for 4 days. The concentration reached 34g / L, and ethanol reached 4g / L.

Embodiment 2

[0027] Embodiment two (sequencing batch type)

[0028] The solid content rate of raw food waste is 15%, the concentration of organic acid in the supernatant of food waste before fermentation is 665mg / L, the COD content is 74g / L, and the operating condition of the acid-producing fermentation tank is set at 35.0°C. The pH is 6.0, the stirring speed is 125rpm, the ultrasonic pulse generator generates 20kHz ultrasonic waves, and the pulse is once every 5min. The acid-producing fermentation tank is operated for 4 days. The concentration of organic acid in the garbage supernatant reached 41g / L, and the concentration of ethanol reached 6g / L.

Embodiment 3

[0029] Embodiment three (continuous)

[0030] The solid content rate of the raw food waste is 15%, the organic acid concentration in the supernatant of the food waste before fermentation is 671mg / L, and the COD content is 73g / L. The acid-producing fermentation tank is set to operate at a temperature of 35.0°C. The pH is 6.0, the stirring speed is 125rpm, the ultrasonic pulse generator generates 20kHz ultrasonic waves, and the pulse is once every 15min. The hydraulic retention time is 4 days, and the continuous operation is 30 days. ℃, the concentration of organic acid in the supernatant of food waste is maintained at about 28g / L, and the concentration of ethanol is about 4g / L.

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Abstract

The invention discloses an acid producing fermentation tank for treating kitchen wastes and producing a carbon source. A feed port and a vent hole are formed in the upper part of a fermentation tank main body; a temperature probe, a pH probe, a DO probe, a sampling port, a sight glass port and a sight glass lamp are arranged on the lateral surface of the fermentation tank; a rotating main shaft is arranged on the axis of the fermentation tank main body, agitating vanes are arranged on the main shaft, the top of the rotating main shaft is connected with a speed change motor, the feed port is connected with a feed pipeline, a discharge port is formed in the lower part of the lateral surface of the tank body and connected with a discharge pipeline, and a pH adjusting port is formed in the top of the acid producing fermentation tank and connected with an acid tank and an alkali tank through a pH adjusting valve. The acid producing fermentation tank has the functions of temperature control, pH control, agitating speed control, ultrasonic enhanced treatment and the like, can realize automatic feed and discharge of the kitchen wastes, and has a pH value pre-adjusting function; by adopting the acid producing fermentation tank, the pH value fluctuation of fermentation liquid is smaller than 0.1.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, and relates to a reaction device for producing carbon sources by using kitchen waste, in particular to an acid-producing fermenter for producing carbon sources from kitchen waste. Background technique [0002] Kitchen waste accounts for 30% to 50% of the total urban domestic waste. This part of waste is usually disposed of in sanitary landfills together with other domestic waste. Harmless, resourceful and reduction of waste disposal. Therefore, some people proposed the treatment mode of using food waste to produce livestock feed. After a period of trial, it was found that the feed produced by this treatment method had the risk of biosimilar infection, so it was gradually banned by the state. In addition, another person proposed to use the anaerobic digestion process to produce methane. The actual project proved that this scheme is feasible, but the high content of salt and oil in t...

Claims

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Application Information

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IPC IPC(8): C12M1/38C12M1/36C12M1/34C12M1/02
CPCC12M21/12C12M23/22C12M27/02C12M35/04C12M41/22C12M41/26C12M41/32C12M41/42C12M41/48
Inventor 蒋建国王权宫常修
Owner TSINGHUA UNIV
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