Kitchen waste fermentation method based on pure oxygen fermentation and hydrogen-rich static natural decomposition, and fermentation product and application thereof

Abstract

The invention relates to a kitchen waste fermentation method based on pure oxygen fermentation and hydrogen-rich static natural decomposition and a fermentation product and application thereof. The method comprises the following steps of directly putting kitchen waste which is not crushed, rinsed, extruded, dehydrated, desalted and degreased into a biochemical reactor, adding Whara No.4 bacteria, controlling the temperature at 58-68 DEG C, meanwhile, starting the stirrer, the condenser and the electrolyzed water oxygen and hydrogen production device, and discharging no rinsing sewage or odor in the fermentation process. The fermentation speed of the kitchen waste can be increased by inputting pure oxygen, hydrogen-rich make-up water is added after 24-hour aerobic fermentation, and the kitchen waste can be completely decomposed after static natural fermentation. By adopting pure oxygen fermentation, odor emission and heat energy loss caused by blast oxygenation can be avoided, and the problems of odor treatment and high energy consumption in the fermentation process are solved. The kitchen waste fermentation cost is low, secondary pollution is avoided during fermentation, and the completely fermented kitchen waste can be used as an agricultural fertilizer, so that the aim of resource utilization of the kitchen waste is fulfilled.

Description

technical field [0001] The invention relates to the technical field of kitchen waste treatment, in particular to a kitchen waste fermentation method based on pure oxygen fermentation and hydrogen-rich static natural decomposition, its fermentation product and its application. Background technique [0002] Food waste is a kind of high-fat, high-protein, high-starch, high-fiber and high-salt waste that is easy to acidify and rot, and its amount has accounted for 50%-60% of urban waste. Therefore, looking for food waste An effective way of resource utilization has become a top priority. Common treatment methods include: biogas production, landfill, incineration, aerobic composting, feed treatment, medium as bait organisms, and aerobic or anaerobic high-temperature fermentation using biochemical reactors, etc., but these treatment methods are more or less At least there are common problems such as high investment cost, sewage or odor discharge during the treatment process, high...

AI Technical Summary

Problems solved by technology

The crushing, rinsing, extrusion, desalination, dehydration and degreasing processes in this process all need to be equipped with special additional equipment for treatment, which not only increases the equipment investment cost and energy consumption, but also makes it difficult to treat the high-concentration sewage generated during the treatment process , the treatment period is long and the treatment cost is high. At the same time, it is also a poor operability to transport and treat the high-concentration sewage generated every day. Therefore, most of the kitchen waste sewage is discharged into the urban sewage pipe network or sewer at present. , it is obvious that the discharge of sewage is a kind of secondary pollution, which is contrary to the environmental protection purpose of food waste treatment, and it is necessary to correct it

In addition, although the current food waste treatment can improve the efficiency of fermentation by adding bacteria to the biochemical reactor, due to the limitation of the characteristics of the bacteria, the degradation rate of food waste is not high, and the biochemical reactor only plays a role. To the reduction of food waste

The reasons affecting the fermentation are as follows: 1. The existing food waste fermentation strains cannot form a dominant bacterial group in high-fat, high-salt, high-protein, high-starch and high-fiber food waste, especially after acidification of food waste Bacteria reproduction will be greatly inhibited, and the decomposition force will be reduced

2. The temperature for the best reproduction of existing high-temperature-resistant strains is usually below 40°C. Although they can survive under high-temperature conditions, they tend to form spores and become dormant. Their fecundity is the same under high-temperature conditions above 60°C. will decrease, thus affecting the degradation efficiency of food waste

3. Most of the current biochemical reactors use blowers to provide oxygen for aerobic bacteria, the purpose is to promote fermentation, but if the ventilation rate is too large, not only will the heat be lost, but the food waste will also be air-dried due to too fast dehydration, and fermentation Will be limited by this, too small will make dehydration difficult

At the same time, the odor concentration of food waste discharged by the blower is high, and the treatment is difficult and the effect is poor.

In addition, when using biochemical reactors to process food waste, the use of blower aerobic fermentation method still has insufficient oxygen supply, which limits the activity of fermentation bacteria, and the potential of decomposing food waste has not been fully realized. Increasing the air volume The energy will be lost and the power consumption will be greatly increased. Therefore, the above reasons make it difficult for the current food waste biochemical processor to complete the complete fermentation of food waste, and can only meet the requirements of air drying and weight reduction, while incompletely fermented food waste When garbage is put into the farmland and used as fertilizer, it is very easy to cause crop root burn and root rot accidents, which is one of the reasons why the fermentation products of food waste cannot be applied to agricultural planting

In order to further mature the fermentation products of food waste, it is currently a remedial measure taken by most cities in my country to make up for the incomplete fermentation of food waste by transporting the products after primary fermentation to new rural areas or suburbs for composting and fermentation. It is necessary to add bacteria and auxiliary materials, re-adjust the carbon-nitrogen ratio and equip corresponding stirring and turning machines, which will not only greatly increase the production cost, but also require long-term land occupation, which is extremely inefficient and has many problems, such as The odor released by compost will also pollute the environment; in winter and spring, the fermentation speed of compost is slow, and the quality of fertilizer is difficult to guarantee. Even in summer, compost fermentation takes about 30 days. Great impact on environmental health

In addition, there are still many defects in the bacterial agents and technical processes used in the current biochemical reactors. For example, it is difficult to treat the high-concentration odor discharged by the ventilation and oxygenation of the blower, and the existing technical means cannot effectively eliminate it. Pollution and impact on the environment; especially the current biochemical reactor process for processing food waste includes crushing, rinsing, extrusion, heating, stirring, blasting, deodorization and other links, and the fermentation cycle is as long as 48-96 Hours, so the energy consumption is very high, which is an important factor restricting the promotion and application

More importantly, this process not only has secondary pollution to the environment, but also incompletely fermented food waste cannot be used for planting, making it difficult to achieve the goal of resource utilization of food waste

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