Page 21 - Agricultural innovation

The process of raising pigs will generate a huge amount of waste: about 20m /1,000 pigs (or pigs
3
meat). Normally, the entire waste and pig manure come from the process of washing the barn, collecting
manure, leftovers, etc., which the pig farmers collect into the biogas tank for treatment and recovery
when the biogas is reused for other purposes such as cooking or heating.
However, the wastewater after going through the biogas tank is not completely treated with the
content of BOD (Biochemical Oxygen Demand), COD (Chemical Oxygen Demand), ammonium,
phosphorus, E�coli bacteria, coliform, helminth eggs; especially viruses that mutate from diseases such
as Foot-and-Mouth disease, and Blue ear disease (Porcine reproductive and respiratory syndrome–
PRRS) in wastewater. It has been discharged directly into canals, ponds, lakes, etc., threatening human
health and the whole surrounding living environment.
Practices in some key livestock areas in Dong Nai, Bac Giang or Hung Yen provinces show that
biogas tanks are often overloaded and do not process all pig manure, causing unpleasant odors and
free discharge into the environment, so many large farms fined for not meeting wastewater standards.
In recent years, the pig industry has accounted for a very large proportion and developed at a
high rate due to increased consumer demand, which has made the problem of waste treatment not
guaranteed to be safe and hygienic, greatly affecting the quality of life as well as to the environment,
such as pollution of water sources, soil environment, air and agricultural products.
To solve the problem of waste standards (wastewater and odors), Tri Dung livestock farm in
Huong Ho commune, Huong Tra district, Thua Thien Hue province is a typical model for solving
these problems. With the application of advances in electrochemical ultrasound and microbiology of
Huetronics Company, the farm has thoroughly solved the pollution.

3.5.2. Model development
The model of Tri Dung pig farm in Huong Ho commune, Huong Tra district, Thua Thien Hue province
not only treats wastewater well, but also reduces air pollution (smell) in the region through the
application of advances in technology, such as technology of ultrasonic chemistry and EM (Effective
Microorganisms).
The common method of waste treatment in pig farms at present is mainly collecting wastewater
into biogas tanks and composting and then discharging it into a settling pond and then into
the environment.

Figure 4. Popular diagram of sewage treatment in pig farm
Source: Research team

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