With the implementation of waste classification, food waste treatment has attracted much attention Food waste treatment The manufacturer summarized six common treatment methods for food waste.

1. Physical classification

It mainly adopts a series of methods to realize the separation of various components in garbage and then unified recycling. On the one hand, this method uses resources to a large extent, and on the other hand, it reduces the possible pollution caused by garbage to a large extent. However, due to the high cost, most countries do not use this method except a few developed countries.

2. Crushing and direct layout method

As early as the 1940s, the United States successfully developed a personal household food waste disposal machine. The specific principle is to use a high-speed blade to break the food waste in the tank, and then flush the mixture into the sewer, so as to solve the problem of residents discarding and storing food waste. At the same time, Japan has also developed kitchen waste disposal machines for a long time, some of which are even equipped with ozone deodorizers to remove various odors generated by kitchen waste.

3. Landfill method

The landfill treatment of food waste is an anaerobic digestion method, which can decompose organics into methane and completely dispose of waste. This technology is very convenient and will not leave the problem of residue treatment. However, although this method can better deal with kitchen waste, it aims to eliminate waste and cannot realize the recycling of kitchen waste.

4. Anaerobic treatment

This is currently a more environmentally friendly and cost-effective method. The investment is relatively large, and few enterprises produce biogas through anaerobic fermentation. As food waste contains various kinds of animal meat, if it is used as feed, eating people is easy to cause foot and mouth disease and various diseases, thus spreading to humans and causing harm; Because of its high water content, it is easy to produce a large amount of leachate and pollute the groundwater; As fertilizer, odor overflows during production and affects the surrounding environment; Anaerobic treatment can produce a large amount of biogas, which is a clean and renewable energy and can be used for power generation and fuel. Since the system is completely closed and has no odor, anaerobic treatment of food waste is the future development direction.

5. Microbial treatment

It refers to the process of decomposing and utilizing organic substances in food waste through the metabolic growth of microorganisms. The main fermentation methods are solid fermentation and liquid fermentation. Solid state fermentation has been widely used because of its low energy consumption, short cycle and high yield. Solid state fermentation can be divided into single strain solid state fermentation and mixed strain solid state fermentation. At present, mixed strain solid-state fermentation technology is often used: that is, two or more kinds of bacteria are used to ferment food waste, and the synergy between multiple strains is used to produce a large amount of cellulase to degrade fiber, and at the same time, nutrients such as carbon and nitrogen sources are fully used to synthesize single cell protein, so as to improve the nutritional value of protein feed. Solid state fermentation has the advantages of good adaptability, high protein digestibility and absorption, and also avoids the problem of insufficient utilization of nutrients in traditional cooking garbage. The reuse of food waste is an important way for the survival of biological protein feed resources.

6. Composting method

Food waste is rich in organic matter, high in nutrient elements, reasonable in carbon and nitrogen content, suitable for the growth and metabolism of microorganisms, and is a good raw material for production. The basic technology of food waste composting can be divided into anaerobic fermentation composting and aerobic fermentation digestion. Among them, high-temperature aerobic composting is a commonly used method, which can complete the maturity process of material composting in a short time. The high temperature produced during composting can obviously inhibit harmful bacteria.

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