What is the health protection distance for the construction of ecological pig farms? What are its wastewater treatment methods?

Pork is an indispensable ingredient in our daily life, and the broad market promotes the construction of pig farms, so what is the health protection distance it needs in the process? How to deal with the waste water produced? Is there any way? This should be the problem encountered in the construction of pig farms. Let's take a look at the specific situation.

What is the health protection distance?

The health protection distance is the minimum distance from the boundary of the production unit (production area, workshop or section) that produces occupational harmful factors to the boundary of the residential area.

What is the health protection distance of that pig farm?

According to the hygienic Standard of Village and Town Planning (GB18055-2000)

Pig farm (head)

Health protection distance (m)

500,000,000

20000000

10000 to 25000

800,000,000

According to the Technical Standard for pollution Prevention and Control of Livestock and Poultry breeding Industry, the Guangdong Environmental Protection Department issued that newly built, rebuilt and expanded livestock and poultry farms should be at least 500 meters away from cities and urban residential areas. the leeward distance of the prohibited areas designated by the people's government at the county level is at least 500 meters. Therefore, it should first be clear whether the area where the project is located belongs to the above area, if not. The reasonable protective distance from the surrounding residential areas can be determined according to the environmental impact assessment. Therefore, the health protection distance of pig farms in different areas may be slightly different.

Treatment methods of wastewater from pig farms

1. Use of buried sewage treatment equipment

two。 Grid interception treatment, sieve treatment, adjustment treatment, anaerobic reaction treatment, anaerobic precipitation treatment, alkali treatment, aeration treatment, phosphorus removal treatment, AO process treatment and MBR treatment.

3. Rain and sewage separation treatment, dry-wet separation treatment, solid-liquid separation treatment and purification treatment

4. No matter what process and measures are taken to treat pig farm wastewater, certain pretreatment methods should be adopted. The use of pretreatment method can reduce the load of wastewater pollutants in the subsequent treatment steps, and at the same time prevent large solids or sundries from entering the subsequent treatment link, resulting in congestion or damage to the treatment equipment. In view of the large particles in feces, pig farms can use solid-liquid separation techniques such as precipitation, filtration and centrifugation to achieve pretreatment. Common grille, sedimentation tank and screen all belong to this category. Precipitation is one of the most widely used methods in wastewater treatment, which can be used to naturally settle suspended solids and separate from water under the action of gravity. At present, the pig farms with wastewater treatment facilities in large-scale pig farms will basically connect 2-3 sedimentation tanks in series to treat the manure through filtration, precipitation and oxidative decomposition. In addition, some mechanical filtration equipment, including automatic drum filter and centrifugal disc separator, can be used in the pretreatment steps of pig farm manure. All wastewater treatment methods should be in accordance with the Technical Specification for pollution Prevention and Control of Livestock and Poultry breeding Industry of the Ministry of Environmental Protection of the people's Republic of China.

Attachment: full text of Technical Specification for pollution Prevention and Control of Livestock and Poultry breeding http://www.mep.gov.cn/image20010518/4589.pdf