清粪方式在不同季节对规模化猪场臭气浓度的影响OA

To investigate the effects of different manure removal methods on the emission concentra-tions and patterns of ammonia(NH3)and odors in large-scale pig farms,two large-scale pig farms emplo-ying different manure removal techniques were selected,and measurements were conducted at the fan inlet,farm boundary,and inside the pig housing during both winter and summer seasons.Results showed that(1)at the fan inlet,during summer,the mean NH3 concentration under dry manure removal was(0.24±0.42)mg/m3,and the mean odor value was 77±50.For water-diluted manure,the NH3 concentration averaged 2.13±1.28 mg/m3,with an odor value of 271±121.During winter(with the fans in operation),dry manure removal resulted in an mean NH3 concentration of 8.38±3.56 mg/m3 and an odor value of 226±60.For water-diluted manure,the NH3 concentration averaged 8.97±2.44 mg/m3 with an odor value of 570±107.(2)At the farm boundary,odor levels were as follows:summer,dry manure removal at 36±27;water-diluted manure at 273±95;winter,dry manure removal at 35±29;water-diluted manure at 131±87.(3)Inside the pig housing,during winter,the mean NH3 concentration was 16.34±7.35 mg/m3,with an odor value of 515±200 for dry manure re-moval;for water-diluted manure,the NH3 concentration was 23.85±4.36 mg/m3,with an odor value of 1077±239.Conversely,in summer,water-diluted manure had an NH3 concentration of 1.62±2.94 mg/m3 and an odor value of 1036±360.The study indicates that dry manure removal significantly reduces NH3 concentrations and odor levels at the fan inlet,farm boundary,and within pig housing.Odor concentra-tions inside pig houses are significantly higher in winter,while at the farm boundary,odor levels are nota-bly lower in winter compared to summer.Overall,dry manure removal proves to be more effective than water-diluted manure in controlling odor emissions from large-scale pig housing.