Treatment and recycling of kitchen wastes

Abstract

The invention relates to a method for treating kitchen wastes by utilizing photosynthetic bacteria and recycling the kitchen wastes. The method particularly comprises a kitchen waste pretreating method which includes carrying out hydrolysis acidification treatment on the kitchen wastes until the concentration of volatile fatty acid is up to be 5000-15000mg / L to obtain hydrolysis acidification liquid, performing solid and liquid separation on the hydrolysis acidification liquid, adjusting the pH value of the liquid to be 6.5-7.5 to obtain a pretreated material, and a method for culturing the photosynthetic bacteria by using the pretreated material, which comprises the following steps of: inoculating 100-1000mg / L of a photosynthetic bacteria flora in the pretreated material and culturing the photosynthetic bacteria flora for 3-5 days under conditions that the illuminance is 1500-5000lux, the temperature is 25-35 DEG C and the dissolved oxygen concentration is 0-0.8mg / L. A product obtained by using the method can be used for preparing feed additives, water purification agents, ecological organic fertilizers or aquaculture baits. The method is strong in poison resistance capability for treating the kitchen wastes, good in denitrification and high in organic matter removal capability.

Description

technical field

[0001] The invention relates to a method for biological treatment and resource utilization of organic waste, in particular to a method for utilizing photosynthetic bacteria to process kitchen waste and realize its resource recovery, and belongs to the fields of environmental protection and biotechnology. Background technique

[0002] Food waste is the leftover food from the kitchen and dining table, also known as swill, swill or slop. If these wastes are not handled properly, they will not only endanger people's health, but also seriously pollute the environment. The water content of food waste is as high as 80% to 90%. The seepage water in the swill can easily pollute the groundwater through osmosis. When the temperature is high, the organic matter in the swill will quickly ferment and rot, resulting in large intestine Bacillus and other pathogenic microorganisms directly endanger human health. If it is used as pig feed, various pathogenic bacteria will sp...

Examples

Embodiment 1

[0047] The preparation of embodiment 1 kitchen waste pretreatment material

[0048] The food waste comes from a mixture of food processing leftovers and edible residues in a university cafeteria, with a moisture content of 83%, a carbon-to-nitrogen ratio of 26.3%, and an ash content of 1.1%. Firstly, the kitchen waste is crushed, and after crushing, 2g / L anaerobic sludge is added for hydrolysis and acidification treatment to obtain a hydrolysis and acidification solution. The method of acidification hydrolysis treatment is the prior art, or refer to the Chinese patent application with application number 200910117333. The broken food waste is in the form of granules, and the organic matter in it is released and dissolved to produce small molecular fatty acids under the action of hydrolysis and acidification microorganisms. When the total VFA concentration reaches 8000 mg / L, solid-liquid separation is carried out; the solid part continues to undergo hydrolysis and acidification ...

Embodiment 2

[0049] The preparation of embodiment 2 kitchen waste pretreatment material

[0050] The food waste comes from a mixture of food processing scraps and edible residues from a restaurant in Yubei District, Chongqing City, with a moisture content of 75%, crude fat of 2.67%, and ash content of 1.8%. Firstly, the kitchen waste is crushed, and then acidified and hydrolyzed to obtain a hydrolyzed and acidified liquid. The method of acidification and hydrolysis treatment is the prior art, which can be referred to the Chinese patent application with application number 200910117333; or the hydrolysis and acidification is carried out by adding anaerobic sludge with a concentration of 10g / L. The broken food waste is in the form of granules, and the organic matter in it is released and dissolved to generate small molecular fatty acids under the action of hydrolytic acidification microorganisms. When the total VFA concentration reaches 6000mg / L, solid-liquid separation is carried out; the so...

Embodiment 3

[0051] The preparation of embodiment 3 kitchen waste pretreatment material

[0052] Food waste comes from a mixture of food processing scraps and food residues from a household in Chongqing, with a moisture content of 80%, crude fat of 3.14%, and ash content of 1.5%. liquid. The method of acidification and hydrolysis treatment is a prior art, for which reference may be made to Chinese patent application No. 200910117333. The broken food waste is in the form of granules, and the organic matter in it is released and dissolved to produce small molecular fatty acids under the action of hydrolysis and acidification microorganisms. When the total VFA concentration reaches 12000mg / L, solid-liquid separation is carried out; the solid part continues to undergo hydrolysis and acidification treatment ;Add 10mol / L sodium hydroxide to the liquid part to adjust the pH value until the pH is stable at about 6.0, then add 0.6g / L sodium bicarbonate to obtain the pretreatment material.

technical field

[0001] The invention relates to a method for biological treatment and resource utilization of organic waste, in particular to a method for utilizing photosynthetic bacteria to process kitchen waste and realize its resource recovery, and belongs to the fields of environmental protection and biotechnology. Background technique

[0002] Food waste is the leftover food from the kitchen and dining table, also known as swill, swill or slop. If these wastes are not handled properly, they will not only endanger people's health, but also seriously pollute the environment. The water content of food waste is as high as 80% to 90%. The seepage water in the swill can easily pollute the groundwater through osmosis. When the temperature is high, the organic matter in the swill will quickly ferment and rot, resulting in large intestine Bacillus and other pathogenic microorganisms directly endanger human health. If it is used as pig feed, various pathogenic bacteria will sp...

Examples

Embodiment 1

[0047] The preparation of embodiment 1 kitchen waste pretreatment material

[0048] The food waste comes from a mixture of food processing leftovers and edible residues in a university cafeteria, with a moisture content of 83%, a carbon-to-nitrogen ratio of 26.3%, and an ash content of 1.1%. Firstly, the kitchen waste is crushed, and after crushing, 2g / L anaerobic sludge is added for hydrolysis and acidification treatment to obtain a hydrolysis and acidification solution. The method of acidification hydrolysis treatment is the prior art, or refer to the Chinese patent application with application number 200910117333. The broken food waste is in the form of granules, and the organic matter in it is released and dissolved to produce small molecular fatty acids under the action of hydrolysis and acidification microorganisms. When the total VFA concentration reaches 8000 mg / L, solid-liquid separation is carried out; the solid part continues to undergo hydrolysis and acidification ...

Embodiment 2

[0049] The preparation of embodiment 2 kitchen waste pretreatment material

[0050] The food waste comes from a mixture of food processing scraps and edible residues from a restaurant in Yubei District, Chongqing City, with a moisture content of 75%, crude fat of 2.67%, and ash content of 1.8%. Firstly, the kitchen waste is crushed, and then acidified and hydrolyzed to obtain a hydrolyzed and acidified liquid. The method of acidification and hydrolysis treatment is the prior art, which can be referred to the Chinese patent application with application number 200910117333; or the hydrolysis and acidification is carried out by adding anaerobic sludge with a concentration of 10g / L. The broken food waste is in the form of granules, and the organic matter in it is released and dissolved to generate small molecular fatty acids under the action of hydrolytic acidification microorganisms. When the total VFA concentration reaches 6000mg / L, solid-liquid separation is carried out; the so...

Embodiment 3

[0051] The preparation of embodiment 3 kitchen waste pretreatment material

[0052] Food waste comes from a mixture of food processing scraps and food residues from a household in Chongqing, with a moisture content of 80%, crude fat of 3.14%, and ash content of 1.5%. liquid. The method of acidification and hydrolysis treatment is a prior art, for which reference may be made to Chinese patent application No. 200910117333. The broken food waste is in the form of granules, and the organic matter in it is released and dissolved to produce small molecular fatty acids under the action of hydrolysis and acidification microorganisms. When the total VFA concentration reaches 12000mg / L, solid-liquid separation is carried out; the solid part continues to undergo hydrolysis and acidification treatment ;Add 10mol / L sodium hydroxide to the liquid part to adjust the pH value until the pH is stable at about 6.0, then add 0.6g / L sodium bicarbonate to obtain the pretreatment material.

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