Kitchen waste treatment and resourceful utilization method

Abstract

The invention discloses a kitchen waste treatment and resourceful utilization method, and belongs to the technical field of solid waste treatment. The method includes the steps of modifying zeolite through the cooperation of magnesium salt, ferric salt and alkali liquor to obtain a material A, putting the material A into kitchen waste slurry for fermentation, and improving soil fertility with supernate of fermentation liquor as the denitrification carbon source and solid biogas residues as the good-performance nitrogen and phosphorus slow-release organic fertilizer. The method is easy to operate, the fermentation rate can be greatly increased, the rapid generation of organic acids with acetic acid and lactic acid as the main part is promoted, the organic acids serve as the denitrificationcarbon source, the efficient immobilized removal of nitrogen and phosphorus in the fermentation liquor can be realized, the defect that high-concentration nitrogen and phosphorus enter the denitrification carbon source is overcome, nitrogen and phosphorus can be transferred into the biogas residues to serve as the slow-release fertilizer, and the resourceful utilization of all kitchen waste is realized.

Description

Technical field [0001] The invention relates to a method for the treatment and resource utilization of kitchen waste, belonging to the technical field of solid waste treatment. Background technique [0002] With the development of social economy and the improvement of people's living standards, food waste has increasingly become the focus of social attention. According to incomplete statistics, my country's annual food waste production exceeds 60 million tons. Food waste is rich in organic matter and nutrient elements, has high moisture content, is perishable, and is prone to odor and sewage. If it cannot be disposed of in time, it will have a serious impact on the surrounding environmental sanitation. [0003] The existing food waste treatment and resource utilization processes can be divided into three categories. The first category includes food waste production of biodiesel, methane, ethanol and hydrogen, etc. The products are used as renewable energy sources. At present, this ...

AI Technical Summary

Problems solved by technology

Food waste is rich in organic matter and nutrients, high in moisture content, perishable, prone to odor and sewage, etc. If it cannot be disposed of in time, it will seriously affect the surrounding environmental sanitation

[0003] The existing food waste treatment and resource utilization processes can be divided into three categories. The first category includes the production of biodiesel, methane, ethanol and hydrogen from food waste, and the products are used as renewable energy. At present, this type of technology is theoretically However, due to the complex fermentation mechanism, low yield and long cycle of food waste, its engineering application still needs further research.

The second category includes food waste making feed and composting, but with the promulgation and implementation of the "Animal Epidemic Prevention Law of the People's Republic of China", the method of using food waste directly as feed is restricted

For the composting process, due to the high moisture content and low C / N of food waste, it is often difficult to achieve the expected composting effect in reality, and often needs to be conditioned by adding straw and fungus chaff, and the high oil and salt in food waste have a negative impact on microorganisms. Constraints affect the effect of composting and product quality. At the same time, this technology generally has high energy consumption, large floor area, long cycle, and secondary pollution such as sewage and odor.

The third category includes reducing sugar, lactic acid and other products made from food waste for industrial production. At present, most of these technologies are in the laboratory research stage, and the actual engineering application is less, mainly limited by efficiency and cost.

At present, short-range free fermentation of food waste is used to obtain the product of coexistence of organic acids, carbohydrates and protein as a denitrification carbon source. It has become a new direction for the disposal of food waste, but the denitrification carbon source prepared by this method still has the deficiency of high concentration of nitrogen and phosphorus

In addition, during the fermentation process of food waste, due to the accumulation of acidic substances or other products, the pH of the fermentation system will drop, the activity of microorganisms will be inhibited, the material conversion process will slow down, or even stop, and the acidification process will not be complete.