Home > News

Manure separator systems

Dec. 31, 2018

Manure separator systems specifications and inquiry links: Manure Separator

Fecal Pollution in Large and Medium Aquaculture Farms and Necessity of Treatment - Manure Separator Systems

Manure separator systems

Livestock and poultry manure pollution is serious.

In recent years, with the development of the economy and the improvement of people's living standards, in order to enrich the supply of non-staple food in cities and towns.


A number of support projects have been implemented in major cities and major production areas throughout the country, which has promoted the development of animal husbandry in China towards a large-scale and intensive direction.

According to incomplete statistics, by the end of 1997, there were 14.8 million large and medium-sized livestock and poultry farms in China. Most of these large and medium-sized livestock and poultry farms are located in the suburbs of large and medium-sized cities and densely populated areas for the convenience of transportation, timely supply, and cost reduction.


The development of animal husbandry meets people's growing living needs and contributes to improving the living standards of urban and rural residents. However, a large number of animal manure has brought a series of environmental problems.

Because the excrement of most livestock and poultry farms is not treated and utilized, it is even rare to see farms using inexpensive manure separator systems.

The excessive carrying capacity of feces in the surrounding areas of large and medium-sized cities and rural areas per unit land area leads to serious pollution of a water body due to the arbitrary discharge of feces.


Pollution caused by non-use of manure separator systems


Statistics in 1995 showed that the total COD discharge of industrial wastewater was 76.8837 million tons, while that of livestock and poultry industry was 7.286 million tons, which was close to the total COD discharge of industrial wastewater in China.


In addition, each industry in China produces 634 million tons of industrial solid waste annually, and animal manure is 2.7 times as much as industrial solid waste. In recent years, the government has intensified its efforts to control the pollution of industrial organic wastewater. Through mandatory restrictions reaching the standard and targeted closing, stopping, merging and transferring the discharge of this part of pollutants has been greatly improved.

However, the environmental pollution caused by agricultural production tends to deteriorate, and a large amount of manure from livestock and poultry sites is produced. Over the years, huge pollution sources have been formed in the neighboring towns and rural areas, causing most livestock farms to be surrounded by mosquitoes and flies on sunny days. In rainy days, the excrement floods into rivers, making it impossible for people to fall.


According to the calculation of the scale of pig farms, chicken farms, and cattle farms in 1997, the total amount of excrement in the whole year has exceeded 17.3 billion tons. In addition to the large-scale production of flushing water, the actual amount of sewage discharged far exceeds that figure.

If every farm had simple manure separator systems, these problems would not exist.

Therefore, from the current situation, livestock and poultry manure and sewage have become the main sources of environmental pollution in the surrounding urban areas and densely populated areas.


Now let's take a look at the pollution caused by farm excrement without the treatment of the manure separator systems.


Feces and urine excreta and wastewater from large-scale aquaculture industry contain large amounts of nitrogen, phosphorus, suspended matter, and pathogenic bacteria. The amount of pollutants is large and concentrated, especially the pollution of water quality and odor to the environment is the most serious. It can be said that it has become a super sewage industry in the city. The popularization of manure separator systems has a long way to go.


1.       water pollution


BOD, COD, SS, Escherichia coli, Ascaris eggs, nitrogen, and phosphorus are the main factors related to water pollution.

The wastewater from livestock and poultry farms contains a lot of pollutants, and its biochemical index is very high.

For example, the COD value of pig excreta mixture is 81000mg/L, COD value of mixed excretion of feces and urine reached 36 000 mg/L, the COD of flushing wastewater from cage laying hen farm is 43000-77000mg/L, BOD 17000 - 32000mg/L, the concentration of NH3-N is 2500-4000mg/L.

According to the environmental protection department's test results on the excrement of large-scale farms, COD exceeded the standard by 50-70 times, BOD exceeded the standard by 70-80 times and SS exceeded the standard by 12-20 times.


According to the current management of environmental pollution in large-scale farms in China and the calculation of normal water-fecal flushing loss rate:

40.7 and 30.3 tons of COD and BOD are lost to the water in a 10,000-head pig farm every year. It is equivalent to the emission of pollutants from industrial enterprises of a certain scale.

The amount of feces produced in 30,000 chicken farms is 750 tons per year. The annual discharge of feces from 100 dairy farms is 1100 tons. If poorly managed, 25% of livestock and poultry manure is lost to the water. COD and BOD are 8.7 tons and 6.2 tons respectively.


If there is no manure separator systems on the farm, these contaminations will have to be caused.


High concentration of organic wastewater from livestock and poultry is discharged into rivers and lakes, resulting in deterioration of water quality. The high concentration of N and P in livestock and poultry wastewater is an important cause of eutrophication.

Livestock and poultry wastewater discharged into fish ponds and rivers will cause the gradual death of aquatic organisms sensitive to organic pollution. It seriously threatens the development of the aquatic industry.


Livestock and poultry manure pollutants not only pollute surface water but also easily infiltrate into groundwater, seriously polluting groundwater. It can reduce the dissolved oxygen content in groundwater, increase the toxic components in water quality, and make the water black, smelly and lose its use value in serious cases.


Once livestock and poultry manure pollute groundwater, it is extremely difficult to control and recover, which will cause more persistent pollution.


The manure separator systems also indirectly contribute to the protection of water resources.


2.       Air pollution


Farms produce a large number of odorous gases, which contain a large number of toxic and harmful components such as ammonia, sulfide, methane, and pollute the surrounding air, seriously affecting the air quality.

Many developed countries in the world have strict regulations on the emission of odorous gases.

For example, in the Stench Law of Japan, eight odorous substances have been identified, of which six are closely related to animal husbandry.

They are ammonia, methyl mercaptan, hydrogen sulfide, dimethyl sulfide, methyl disulfide, and trimethylamine. Later, four kinds of lower fatty acids, propionic acid, n-butyric acid, n-valeric acid, and isovaleric acid, were added.

These substances are abundant in livestock and poultry manure, especially pig manure.

With the development of large-scale livestock and poultry farming, the malodorous phenomena of livestock and poultry farms occur from time to time, which endangers the health of the breeders and the surrounding residents, and also affects the normal growth of livestock and poultry.

As I write here, I think of a customer who called me yesterday.

As we all know, the treatment of chicken manure is a difficult problem in the treatment of feces. The treatment efficiency of chicken manure separator systems for chicken manure is relatively low, so this customer wants to use a chicken manure dryer.

This view is wrong, if you use a dryer, it smells great and consumes a lot of electricity. So the best way to treat chicken manure is the chicken manure separator systems.


3.       Crop hazards


High concentration of sewage used for irrigation will lead to crop steep growth, lodging, late maturity or immaturity, resulting in yield reduction, even poisoning crops, and large-scale decay.

According to the survey, some large-scale livestock and poultry farms fertilizer caused damage to surrounding crops, farmers often claim compensation.

In addition, the high concentration of sewage can lead to soil pore blockage, resulting in soil air permeability, water permeability decline, and compaction, seriously affecting soil quality.


ZHEHAN can provide customized service of manure separator systems for global customers. Please leave me a message if you need.


Copyright © Hebei Huanzheng Filter Equipment Co., Ltd. All Rights Reserved

Powered by