CN102451829A - Green integrated treatment method for food waste - Google Patents

Abstract

The invention discloses a green integrated treatment method for food waste. The method takes the food waste as a raw material, and comprises the following steps: 1) the food waste is selected according to solid-liquid state, the solid waste is carried out anaerobic fermentation to obtain biogas, the liquid waste is performed oil-water separation, the separated water phase is inoculated to oleaginous yeast, fermented and extracted to obtain microbial oil, the microbial oil is performed enzymatic conversion with the separated oil phase to synthesize biodiesel, the waste residue generated during the treatment process is capable of producing an organic fertilizer through mixed proportion. The invention efficiently resolves the problem of resource usage of food waste, has the advantages of environment-friendly effect and high use value, reduces the pollution of food waste and changes the waste into the popular products without second pollution for the market. The popular products can be fuel diesel, methane and the organic fertilizer. The method of the invention also avoids some healthy problems such as using the food waste as the fodder which will bring infectious disease. The method of the invention achieves the purposes of changing food waste into resource and carrying out innocuous treatment.

Description

The green integrated processing method of a kind of changing food waste

Technical field

The present invention relates to changing food waste green integrated treatment technology, particularly resource production biodiesel, biogas fuel and organic fertilizer integrated processing method.

Technical background

Reformed and opened up to the outside world 30 years, China's catering trade turnover increases more than 200 times, and annual average rate of increase is up to 20.53%.During by 2008, national sales of the catering industry had reached 15,404 hundred million yuan already, and the catering trade turnover more was expected to reach 20,000 hundred million yuan in 2010.But,, but be increasing changing food waste causes heavy pressure to environment problem in the behind of catering industry develop rapidly.

Traditional processing method mainly contains landfill, burning, pyrolysis, anaerobic digestion, aerobic compost etc., and these methods are both advantageous and disadvantageous, and are often more harm than good; Or land occupation, or contaminated environment, or the cycle is longer; Or cost is higher, and not only utilization rate is very low, and forms secondary pollution easily.

Therefore be necessary prior art is carried out selectivity rejecting, improvement, integrated.

Summary of the invention

The objective of the invention is to overcome existing changing food waste processing method drawback; A kind of integrated green processing scheme is proposed; Reduce environmental pollution, resource recycling to the full extent and avoid the secondary pollution phenomenon in the hope of reaching, realize the economic and social benefit that this processing method is brought.

The objective of the invention is to realize through following technical scheme.

Technical essential of the present invention: collection, sorting and the Separation of Solid and Liquid of at first carrying out changing food waste; Separating obtained solid refuse is produced biogas through anaerobic fermentation; To separating obtained liquid waste liquid through the water-oil separating phase-splitting: water is crossed microbial fermentation and is produced microbial grease, and oil phase passes through esterification reaction of organic acid production biodiesel with water fermentation gained microbial grease; The waste residue that is produced in the processing procedure is used to produce organic fertilizer.

The invention provides the integrated scheme of the green processing utensil rubbishes of a cover.

Description of drawings

The green integrated processing scheme sketch of changing food waste

The specific embodiment

Shown in accompanying drawing: integrated processing scheme may further comprise the steps:

1) collection of changing food waste, sorting and Separation of Solid and Liquid;

2) solid refuse is produced biogas through anaerobic fermentation;

3) the liquid waste liquid is through the water-oil separating phase-splitting;

4) water is crossed microbial fermentation and is produced microbial grease;

5) oil phase and 4) grease obtained through esterification reaction of organic acid production biodiesel;

6) in step 2) and 4) in the waste residue that produced be used to produce organic fertilizer.

Carried out following case study on implementation to relating to key technology in the above step:

Embodiment 1 fermentation obtains microbial grease

Concrete steps:

1) actication of culture: with the inclined-plane of preservation at 28 ℃ of following activation 12h;

2) scrape a ring step 1) activated slant strains with transfer needle, it is inoculated in the aseptic seed liquor culture medium of 50mL, shaken cultivation is 30 hours under 25 ℃, 140rpm, obtains seed liquor;

3) seed culture fluid that fermented and cultured: by the inoculum concentration of 10% (V/V), with step 2) obtains is inoculated in the wastewater fermentation culture medium, in the cultivation 120 hours under the vibration down of 25 ℃, 150rpm;

4) fermentation post processing: after the fermentation ends, centrifugal collection zymophyte body cell, microbial grease is extracted with soxhlet extraction (GB/T 5009.6-1985) in oven dry, grinding back.

Through detecting, the fat content that obtains with said method accounts for the 10-30% of dry cell weight.

Embodiment 2 grease obtained conversion biodiesel synthesis

Concrete steps: the 2g microbial grease or meal kitchen waste oil or any mixing of the two, (height spins the carrier immobilized lipase of cloth to 4g lipase cloth; Apparent enzyme is lived 20000～25000U/g), 200 μ l deionized waters, 2ml benzinum, 93 μ l methyl alcohol (perhaps ethanol) at 40 ℃; The airtight oscillating reactions of shaking table is 12 hours under the 180rpm; Timing sampling is analyzed, and middle whenever stream at a distance from four hours (three times altogether) adds 93 μ l methyl alcohol (perhaps ethanol).Reaction finishes to be used for gas chromatographic analysis after afterreaction liquid dilutes 100 times.

Through detecting, the conversion ratio of the grease conversion biodiesel that obtains with said method is at 85%-95%.

Embodiment 3 grease obtained conversion biodiesel synthesis

Concrete steps: impurity such as bone, fishbone, napkin paper are rejected in the disposable foot back of getting of changing food waste, and after blending with small-sized pulper, anaerobic ferment devices adopts the wide-mouth bottle of 1L, does 3 groups of parallel laboratory tests simultaneously, ferments and detects biogas yield in the process in 25 days.

Through detecting, the biogas daily output that obtains with said method is at 150ml/g-210ml/g.

Claims (3)

1. the green integrated processing method of a changing food waste.Its characteristic comprises the steps:

1) collection of changing food waste, sorting and Separation of Solid and Liquid;

2) solid refuse is produced biogas through anaerobic fermentation;

3) the liquid waste liquid is through the water-oil separating phase-splitting;

4) water is crossed microbial fermentation and is produced microbial grease;

5) oil phase and 4) grease obtained through esterification reaction of organic acid production biodiesel;

6) in step 2) and 4) in the waste residue that produced be used to produce organic fertilizer.

According to claim 1 the conversion ratio of grease obtained conversion biodiesel at 85%-95%.

According to claim 1 anaerobism biogas yield at 150ml/g-210ml/g.

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