Abstract
It is crucial to explore new methods to deal with ammonia pollution in hog barns. In this experiment, ammonia gas generated from the decomposition of nitrogenous organic matter, such as feed and manure in hog barns, was studied. Growing environmental parameters monitored included temperature, humidity, and ammonia nitrogen concentration. For 92 days between March and May, ammonia emissions were characterized by monitoring and collecting the ammonia concentration during the selected time. The results showed that the average temperature in the hog house was 18.2 ± 2.7°C, the humidity was 62.7 ± 0.3%, and the average ammonia concentration range was 17.7∼23.1 mg m−3. The collected ammonia-nitrogen-containing wastewater that entered the denitrification device showed 173, 232, 201, and 280 mgNH4-N/L, respectively. An integrated denitrification device with anaerobic ammonia-oxidizing bacteria as a functional strain was used for denitrification treatment. Through the change of ion concentration in the incoming and outgoing water, an 85.5% average denitrification efficiency was calculated according to the denitrification reaction chemical formula. Thus, the results presented here provide data support for the future use of microbial denitrification equipment to treat ammonia in hog houses.
Highlights
It is crucial to explore new methods to deal with ammonia pollution in hog barns
An integrated denitrification device with anaerobic ammonia-oxidizing bacteria as a functional strain was used for denitrification treatment. rough the change of ion concentration in the incoming and outgoing water, an 85.5% average denitrification efficiency was calculated according to the denitrification reaction chemical formula. us, the results presented here provide data support for the future use of microbial denitrification equipment to treat ammonia in hog houses
Emission reduction in the feeding process is closely related to feeding management, and it is difficult to unify standards and requirements for all farms. e end treatment of ammonia has excellent potential in the environmental protection of aquaculture, and the emission reduction effect is rather satisfactory, which is the general trend of ammonia emission reduction in the future. e main technical challenge of ammonia end treatment is maintaining the emission reduction effect at a higher load rate, increasing the biofilter medium’s service life, and increasing the abundance and number of microorganisms in the biofilter medium
Summary
It is crucial to explore new methods to deal with ammonia pollution in hog barns In this experiment, ammonia gas generated from the decomposition of nitrogenous organic matter, such as feed and manure in hog barns, was studied. Directly exhausting the turbid air from hog houses by ventilation is the most direct and effective method to reduce the ammonia concentration, it does not fundamentally solve the emission reduction of ammonia, which will react with oxides in the air to generate secondary particles such as ammonium sulfate and ammonium nitrate. Ere are three aspects in controlling and treating ammonia pollution in animal husbandry: source prevention and control, emission reduction in the breeding process, and end treatment. Emission reduction in the feeding process is closely related to feeding management, and it is difficult to unify standards and requirements for all farms. e end treatment of ammonia has excellent potential in the environmental protection of aquaculture, and the emission reduction effect is rather satisfactory, which is the general trend of ammonia emission reduction in the future. e main technical challenge of ammonia end treatment is maintaining the emission reduction effect at a higher load rate, increasing the biofilter medium’s service life, and increasing the abundance and number of microorganisms in the biofilter medium
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