Technical model of resource utilization of livestock and poultry manure

1. Anaerobic treatment mode of manure pollution

Specializing in the production of renewable energy as the main purpose, relying on specialized livestock and poultry waste processing enterprise, gather around feces and sewage farms, large biogas project investment construction, high concentrations of anaerobic fermentation, purification of biogas power generation online or biological gas, organic renewal production of farmland use, biogas slurry farmland use or deep processing standards.

Main advantages: centralized and unified treatment of manure and sewage in livestock farms, reducing the investment in manure treatment facilities in small-scale livestock farms; Professional operation, high energy utilization efficiency.

Main deficiencies: high one-time investment; It is difficult to use energy products; Biogas slurry is produced in large quantity and concentrated, and its treatment cost is high. Therefore, it is necessary to support the subsequent treatment and utilization process.

Scope of application: suitable for large-scale breeding farms or intensive breeding areas, with biogas power generation online or biological natural gas into the pipeline network conditions, need to be protected by local government supporting policies.

2. Utilization mode of manure, water and fertilizer

After anaerobic fermentation or oxidation pond treatment and storage of sewage produced by livestock farms, during field fertilization and irrigation, the harmless sewage and irrigation water should be mixed in a certain proportion to carry out integrated application of water and fertilizer. The solid manure should be composted, fermented, and used as fertilizer nearby or entrusted with centralized treatment.

Main advantages: sewage anaerobic fermentation or oxidation pond harmless treatment, to provide organic fertilizer water resources for farmland, solve the pressure of sewage treatment.

Main deficiencies: to have a certain volume of storage facilities, surrounding supporting a certain area of farmland; It is necessary to build a supporting network for transporting feces and water or purchase a vehicle for transporting feces and water.

Scope of application: It is suitable for large-scale pig farms or dairy farms with a certain area of farmland around. In the south, it is advisable to use anaerobic fermentation to produce biogas and other harmless treatment. In the north, it is advisable to directly use oxidized pond for storage.

3. Full return of manure to the field

The manure, urine and sewage produced by the farm are collected and stored in the oxidation pond. The oxidation pond is divided into two types: open type and coated type. The manure is stored in the oxidation pond for harmless treatment and used for farmland in the fertilization season.

Main advantages: low cost of waste collection, treatment and storage facilities, low cost of treatment and utilization; Full collection of feces and sewage, high nutrient utilization rate.

Main shortcomings: the manure storage period usually reaches more than half a year, and sufficient land is needed to build oxidized pond storage facilities; Fertilization period is concentrated, need to support professional mixing equipment, fertilization machinery, farmland application pipe network, etc.; Manure is expensive to transport over long distances and can only be applied within certain limits.

Scope of application: suitable for bubble manure process of pig farm or automatic dung scraping and flushing process of dairy farm, the total solid content of manure is less than 15%; The farmland that needs to match the manure manure level.

4. Aerobic composting mode of feces

Solid manure from large-scale pig, beef cattle, laying hens, broilers and sheep farms is mainly treated with aerobic compost and then used or produced as organic manure in field.

Main advantages: high temperature of aerobic fermentation, more thorough manure harmless treatment, short fermentation cycle; Composting improves the added value of manure.

Main disadvantages: aerobic composting process is prone to produce a large amount of odor.

Scope of application: suitable for only solid manure, no sewage production of large-scale broiler, laying hens or sheep farm, etc.