1. Biological deodorization method: It is found that many beneficial microorganisms can improve the utilization rate of feed protein, reduce the emission of ammonia in feces, inhibit bacteria from producing harmful gases, and reduce the content of harmful gases in the air.

2. Gas adsorption method: harmful gases in the air are adsorbed by substances with adsorption functions such as fluorite, yucca extract, charcoal, activated carbon, coal cinder and quicklime. The method is to put charcoal in a net bag and hang it in a pigsty or sprinkle some activated carbon, cinder and quicklime on the ground properly, which can eliminate harmful gases in the pigsty to varying degrees.

3. Sulfur-inhibiting ammonia method: adding sulfur into the padding can make the pH value of the padding less than 7.0, which can inhibit the generation and emission of ammonia in feces and reduce the ammonia content in the air of pigsty. The concrete method is to mix 0.5 kg sulfur per square meter of ground into the padding to pave the ground.

4. Method of neutralizing ammonia with calcium superphosphate: Sprinkle a layer of calcium superphosphate on pigsty padding, and the calcium superphosphate reacts with ammonia produced in pig manure to generate tasteless solid ammonium phosphate, which can reduce the emission of ammonia in feces and the concentration of ammonia in chicken coops. The method is to evenly sprinkle 350 grams of calcium superphosphate on the mat of every 50 chickens.

5. Chemical deodorization method. The use of hydrogen peroxide, potassium permanganate, sulfuric acid ketone, acetic acid and other chemicals with odor inhibition, through sterilization and disinfection, inhibit the activities of harmful bacteria, thereby inhibiting and reducing the production of harmful gases in pigsty. The method is to mix 4% ketone sulfate and appropriate amount of hydrated lime in the padding, or spray 2% benzoic acid or 2% acetic acid on the padding to deodorize.