Recycling treatment method for kitchen wastes

Abstract

The invention innovatively provides a method for preparing a protein foamer from kitchen wastes and a recycling and classifying treatment method for the kitchen wastes. The method comprises the following steps: adjusting the moisture content of the kitchen wastes to be 80-90%, adding an alkaline chemical agent, and heating for hydrolysis; cooling, performing solid-liquid separation to obtain solid residues, adjusting the pH value to be 7-8, utilizing the solid residues as a fertilizer, and performing centrifugation and oil removal on supernatant liquor; recovering grease separated after centrifugation and oil removal, utilizing the grease as a raw material of biodiesel, and performing membrane concentration on mixed liquor subjected to centrifugation and oil removal to obtain protein molecules with the molecular weight of 5-20 kDa and protein molecules with the molecular weight of lower than 5 kDa respectively, wherein the protein molecules with the molecular weight of 5-20 kDa form protein concentrated liquor as the protein foamer, and the protein molecules with the molecular weight of lower than 5 kDa form protein concentrated liquor as a liquid organic fertilizer. The method innovatively provided by the invention can enable the kitchen wastes to generate a high-added-value recycling product after being treated and to be more fully utilized.

Description

technical field [0001] The invention belongs to the technical field of kitchen waste treatment, and in particular relates to a resourceful treatment method for kitchen waste. Background technique [0002] In recent years, with the rapid development of my country's economy and the continuous improvement of people's living standards, the generation of kitchen waste has increased year by year, which has brought a heavy burden to urban domestic waste treatment. At the same time, unsafe disposal methods such as conversion into waste oil and returning to the dining table have become a major social problem. How to effectively deal with kitchen waste and turn it into treasure without causing new health threats is the goal of many researchers. [0003] At present, the main treatment method of kitchen waste in my country is to mix it with domestic waste for landfill or incineration, which not only causes a waste of resources, but also increases the difficulty and cost of domestic was...

AI Technical Summary

Problems solved by technology

[0003] At present, the main treatment method of kitchen waste in my country is to mix it with domestic waste for landfill or incineration, which not only causes a waste of resources, but also increases the difficulty and cost of domestic waste disposal.

The composition of kitchen waste is complex, highlighted by high moisture content, high organic matter content, and complex protein components, making some newly developed technologies, such as anaerobic digestion of kitchen waste biogas production, biological bacteria to make biological fertilizer or biological feed, etc. There are some problems in the processing and utilization methods: (1) The biological strains of kitchen waste are complex and difficult to ensure safety; (2) The complexity of protein components leads to a low overall resource utilization rate in a single processing and utilization method, and the utilization in high value-added fields (3) The high content and complexity of organic matter are likely to cause a greater impact on the biological treatment system, resulting in high input and maintenance costs and low treatment efficiency

[0004] The above problems directly limit and restrict the application of the existing kitchen waste treatment technology. How to treat kitchen waste scientifically, rationally, economically and effectively and make it be fully applied has become the key to the kitchen waste treatment technology.