Abstract
Human living environments and health are seriously affected by the odor produced from fermentation of livestock and poultry manure. In order to reduce the odor pollution caused by livestock and poultry manure, efficient strains were screened and two methods were tried in this study. The orthogonal test design was used to analyze the gas produced by pig manure under different conditions of temperature, time, wheat straw doping amount and calcium carbonate doping amount. Then, according to ammonia, hydrogen sulfide and comprehensive odor removal effects, the high efficiency of deodorizing strains were screened. The results showed that pig manure produced the least odor when the temperature was 20 °C, added 0% calcium carbonate, 20% wheat straw and waited for 48 h. Three strains were screened to inhibit the odor production of pig manure: Paracoccus denitrificans, Bacillus licheniformis and Saccharomyces cerevisiae, showed that their highest removal rate of ammonia and hydrogen sulfide gas could reach 96.58% and 99.74% among them; while for three strains of end-control pig manure stench: Pichia kudriavzevii, P. denitrificans and Bacillus subtilis, the highest removal rate of ammonia and hydrogen sulfide gas reached 85.91% and 90.80% among them. This research provides bacteria resources as the high-efficiency deodorizing function for the source suppression and the end treatment of the odor gas of pig manure, which has high application value for the control of odor pollution.
Highlights
With the increasing consumption of meat, eggs, and milk, the poultry and livestock breeding industry has developed rapidly [1]
In order to grasp the release rules of malodorous gas in livestock and poultry manure, screen the microbial strains that inhibit the production of malodorous gas in livestock and poultry manure and efficiently transform the malodorous gas, pig manure was used as research material, while ammonia, hydrogen sulfide and comprehensive malodorous gases were used as indicators to study the production rules of malodorous gas from pig manure under different external conditions
Temperature, wheat straw, time and calcium carbonate were selected as experimental factors to observe the changes in the concentration of five malodorous gases for better understanding of the changes in the level of malodorous gases produced by pig manure
Summary
With the increasing consumption of meat, eggs, and milk, the poultry and livestock breeding industry has developed rapidly [1]. The compound microbial deodorant prepared by Bacillus megaterium, Candida tripicalis and Streptomyces griseus could remove more than 80% of the odor from chicken, pig and cow manure, and more than 65% of the hydrogen sulfide could be removed [20] This showed that microorganisms could effectively remove the malodourous gas produced by livestock and poultry manure. In order to grasp the release rules of malodorous gas in livestock and poultry manure, screen the microbial strains that inhibit the production of malodorous gas in livestock and poultry manure and efficiently transform the malodorous gas, pig manure was used as research material, while ammonia, hydrogen sulfide and comprehensive malodorous gases were used as indicators to study the production rules of malodorous gas from pig manure under different external conditions. The microbial strains with effective inhibition at the source and efficient adsorption transformation at the end were screened, which provided material and technical support for the healthy development of the livestock and poultry breeding industry and odor control
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