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Food waste acidifying hydrolysis treatment method

A technology of food waste and treatment method, which is applied in acidification and hydrolysis treatment of food waste, and in the field of food waste treatment, which can solve the problems of complex process, high energy consumption, and many equipment, so as to reduce equipment investment and save energy The effect of consuming and simplifying the preprocessing process

Inactive Publication Date: 2009-11-25
宝林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This treatment method has complicated process and high energy consumption; it needs many equipment and high investment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) The unsorted kitchen waste is mechanically crushed and mixed with water to obtain a fluid mixture with a solid content of 8-22%, which is convenient for feeding.

[0017] Considering that the raw materials may contain large-sized organic matter, which is not conducive to acidification and hydrolysis, a double-screw crusher is used for crushing, so that the particle size of food waste particles is controlled at 5-50mm.

[0018] (2) The above-mentioned fluid mixture is pumped into the hydrolysis reactor, then water with 1 to 5 times the mass of food waste is added, and the food waste is stirred repeatedly in circulation; the temperature in the hydrolysis tank is controlled at a medium temperature condition of 34-40°C, The kitchen waste is hydrolyzed and acidified for 3 to 10 days, and the pH value of the acidified solution is controlled at 1.5 to 6.8.

[0019] During the flushing and hydrolysis process, the sufficient mixing of water and kitchen waste is one of the ke...

Embodiment 2

[0025] The specific process steps are the same as in Example 1, except that the high-temperature hydrolysis method is adopted, and the temperature in the hydrolysis tank is controlled at a high temperature of 50-56° C., so that the kitchen waste is hydrolyzed and acidified for 2-5 days, and the pH value of the acidified solution is controlled at 1.5~6.8.

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Abstract

The invention provides an anaerobic fermentation treatment method for food waste. The method comprises: crushing the unsorted food waste by machine, mixing with an amount of water to obtain a mixture with solid content of 6-35%; loading the mixture into a hydrolysis reactor by a pump; adding water into the hydrolysis reactor by amount of 1-5 times of the food waste mass; performing repeated cycling, flushing and acidifying to the food waste under the condition of 34-40 or 50-56 degrees centigrade for 2-10 days, while controlling the pH value of the acidification liquid between 1.5 and 6.8; filtering the hydrolyzed acidification liquid, and loading it into a methanation reactor, making into biogas by anaerobic digestion, performing desulfurization treatment, and using as energy; performing compost treatment to the hydrolyzed solid material according to the routine compost technology to obtain organic fertilizer. The invention simplifies the pretreatment process of the food wastes greatly, saves energy consumption, reduces equipment investment, realizes the recycling of food waste effectively, and meets the environmental protection idea.

Description

technical field [0001] The invention belongs to the technical field of garbage treatment, and relates to a treatment method of kitchen garbage, in particular to an acidification and hydrolysis treatment method of kitchen garbage. Background technique [0002] Food waste is different from other wastes (domestic waste, industrial waste, commercial waste, agricultural waste, etc.), and its characteristics are: 1. High moisture content, about 72% (removing free water) - 92% (including free water) ; 2, complex composition, high organic content, about 90% (dry weight); 3, high oil content; 4, containing salt that inhibits anaerobic fermentation; 5, because there is no classification, it contains about 10% impurities ( Mainly chopsticks, plastic, paper, a small amount of metal, lunch boxes, packaging, etc.), which will adversely affect post-processing equipment (fermentation, dehydration, pipelines, etc.). [0003] At present, the main method of processing food waste is to process...

Claims

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Application Information

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IPC IPC(8): B09B5/00B09B3/00C12P5/02C05F9/04C05F17/00
CPCY02E50/343Y02A40/20Y02E50/30Y02W30/40
Inventor 左航宝林郎锐王玲
Owner 宝林
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