Disposal and reuse of food waste

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...

AI Technical Summary

Problems solved by technology

For example, the crushing and direct discharge is mainly to crush the garbage and discharge it directly into the sewer. Although the cost is low and the operation is simple and easy, it increases water consumption, and it is easy to cause blockage of water pipes and increase the load of the sewage treatment plant; sanitary landfill requires a large amount of land. Moreover, secondary pollution such as leachate and waste gas is produced, which poses a serious threat to the environment, especially groundwater resources; although composting can realize the resourceful treatment of food waste, the quality of the fertilizer often produced is not high, and the high-quality composting method The cost is relatively high, and the problem of odor produced by composting is always difficult to solve; the main problem of feed treatment is feed safety. In China, it is mainly fed directly to poultry and livestock. This method can easily cause the spread of diseases, and some toxic and harmful substances will Accumulated in the body of poultry and livestock, it will bring harm to human health through the food chain, and even cause cross-infection of diseases between humans and livestock; the advantage of anaerobic digestion treatment is that anaerobic microorganisms have high organic load bearing capacity, and the closed operation of the reactor reduces the processing time. Secondary pollution of the environment by the process, while processing waste, it can recover biomass energy (hydrogen, methane)

However, the anaerobic digestion process of food waste is mainly derived from the industrial sewage treatment process, and there are still some problems in applying it to the treatment of food waste: ①The cultivation and domestication process of methanogenic bacteria is complicated, and the process start-up time is long; The high fat, high salinity and high ammonia nitrogen in the garbage hydrolyzate strongly inhibit the methanogenic process of methanogens, resulting in insufficient biogas production; ③The harmless disposal of biogas residue and biogas slurry and the collection and utilization of biogas are low; ④Operation High security requirements

The patent with publication number CN101250068A discloses a method for producing photosynthetic bacteria biofertilizer from livestock farm sewage, and the patent with publication number CN102701460A discloses a method for utilizing a strain of photosynthetic bacteria to treat starch wastewater and realize waste water recycling. The publication number is CN1281892A The patent discloses a method for producing photosynthetic bacteria cells from molasses alcohol waste mash, which all belong to the category of photosynthetic bacteria wastewater treatment and resource utilization, and there is no public report on the research on photosynthetic bacteria organic waste treatment and resource utilization

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