How to reduce pollution in the construction of pig farms?

11 months ago

A domestic pig with a circumference of about 90kg has a defecation capacity of about 2.2kg per day and a urine output of about 2.9kg. A fattening pig has a defecation of 800 to 1050kg from birth to discharge, and urinary 1200 to 1300kg; a 10,000 pig farm produces 30,000 a year.

How to reduce pollution in the construction of pig farms?

A domestic pig with a circumference of about 90kg has a defecation capacity of about 2.2kg per day and a urine output of about 2.9kg. A fattening pig has a defecation of 800 to 1050kg from birth to discharge, and urinary 1200 to 1300kg; a 10,000 pig farm produces 30,000 a year.

Tons of manure and urine, together with the use of water in the washing column, can produce 60,000 to 70,000 tons of wastewater a year. Through the rational design of the pig farm, the purpose of protecting the environment and reducing pollution is achieved.

Ways to reduce environmental pollution from the perspective of pig farm planning and design

1.Site selection

This year, the Ministry of Agriculture has designated suitable areas, restricted areas and banned areas. To a large extent, the pig farms have been kept away from urban residential areas, schools, hospitals, scenic spots, river basins, water conservation areas for drinking water, etc. Sensitive area. There are forest fruit and vegetable planting bases around the area, and the manure is absorbed in the surrounding planting area through the underground pipe network.

"One pig and one acre" can be used in the near field. One mu (667m2) land can digest 2 tons of slurry or 3 tons of "liquid fertilizer" after solid-liquid separation.

Taking the resource utilization of waste as the purpose, promoting the combination of agriculture and animal husbandry, ecological recycling, integrating the management of animal husbandry waste into the strategy of sustainable agricultural development, and promoting the “reduction, harmless and resource utilization of livestock and poultry excrement” To achieve sustainable and healthy development of the livestock industry. Site layout (culture area and living area are arranged separately).

2.Rain and sewage diversion

Rainwater ground clear ditch, sewage underground underground pipe, set up a well, and inspection holes to reduce the amount of sewage.

3.Drinking water metering, control and management

Avoid drinking fountains (change the duck-bowl type drinking fountains for bowl-type drinkers) and water pipe nets.

Most of the pig drinking fountains use duck-bills. When the pigs drink water, about one-third of the water will be leaked and wasted. Moreover, pigs have the habit of playing in the water, causing a lot of water to be mixed into the excrement; reducing the amount of water flushing (using blistering floor blisters, high bed breeding).

4.The implementation of dry cleaning, solid-liquid separation

The dry manure discharged from the pigs is manually collected and placed in a septic tank (house). The dregs, urine and rinsing sewage are separated by solid-liquid (dry and wet) after sedimentation in the sedimentation tank.

It is conducive to simplifying the sewage treatment process and equipment, reducing the post-treatment cost of sewage, maintaining the nutrients of solid manure, improving manure efficiency; facilitating the utilization of manure fertilizer resources, effectively removing feces and urine from pig houses, and keeping pigs The environment is sanitation, and the source of pollutants is reduced (by solid-liquid separation, the COD of sewage is reduced by 40%). Keep “circle dry and full” and reduce the frequency of washing the bar to reduce the amount of sewage.

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