| The wide range of sources and diverse types of malodorous gases pose a significant threat to both production and daily life,and have a serious impact on ecological environment and human health,which greatly restricts the sustainable development of animal husbandry.The storage area of animal manure is a significant source of malodorous gas emissions on livestock farms,yet there are few studies assessing its emission characteristics.In order to develop more scientific and effective odor control measures and technologies,improve treatment efficiency and effectiveness,reduce treatment costs,and achieve standard emissions of malodorous gases from manure storage areas,this study focuses on a solid manure storage room in a pig farm,where physiological parameters of malodorous gases were measured and analyzed,summarize the characteristics of odorous gas emissions from manure storage areas.A testing system for odor control technology was designed and developed to determine the most suitable odor control technology for different odor environments.The main research results are as follows:（1）Analysis of malodorous gas emission characteristics from a solid manure storage room in a pig farmThrough continuous monitoring of the emission of odorous gases from solid manure storage areas in pig farms,the results showed peak concentrations of ammonia（NH3）,hydrogen sulfide（H2S）,and total volatile organic compounds（TVOC）at 0.56 mg/m3,1.81 mg/m3,and 554 ppb,respectively.Particularly,H2S concentration significantly exceeded the national emission standard limit,and the emission concentrations of these gases reached their peaks around 3 PM within a day.Pearson correlation analysis indicated a highly significant positive correlation among NH3,H2S,and TVOC emissions from the pig farm’s solid manure storage facilities.Temperature showed a highly significant positive correlation with the aforementioned odor components,while air relative humidity exhibited a significantly negative correlation with NH3and H2S and a negative correlation with TVOC.CO2exhibited a highly significant negative correlation with NH3and H2S.The emission of malodorous gases from the solid manure storage facilities is influenced by multiple factors.（2）Analysis of the actual application effect of deodorization equipment for solid manure storage room in a pig farmBy monitoring the concentration of odorous gases emitted from the organized outlet of the solid manure storage area at the livestock farm,and using solid Na OH and 98%concentrated H2SO4solution to adjust the p H of the spray solution,the results showed that the NH3concentration at the inlet of the spray tower was 25.72 mg/m3and the H2S concentration was 18.47 mg/m3.Under tap water（p H=7.56）spraying,the treatment efficiency of the spray tower for NH3was 63.56%and for H2S was 21.77%.The concentrations of tail gas emissions were 9.37 mg/m3and 14.45 mg/m3,respectively,which did not meet the national emission standard limits,and the selected equipment and parameters did not meet the requirements.After adjusting the p H of the spray solution,the removal rate of NH3could reach 78.19%,which increased with the decrease of p H value,while the removal rate of H2S could reach 27.70%,which increased with the increase of p H value.Adjusting the p H of the spray solution based on the actual concentration of odor components in the plant area can improve the overall deodorization efficiency.（3）Development of an optimal deodorization process testing systemBased on the above research results,it is found that there is a mismatch between equipment selection and parameter design and actual needs in the actual application of odor treatment engineering,and designers cannot accurately select and apply odor purification processes and equipment based on empirical judgment alone.Therefore,this study designs and develops a test system to easily determine the selection of odor purification process,which has the advantages of selecting any equipment,mobile,integrated,remote operation and intelligent monitoring,etc.It can determine the most suitable odor purification process and its operation parameters according to the composition and concentration of odor gases in different plants,thus reducing the investment and operation costs of odor treatment projects,and at the same time achieving better odor purification effect.In this study,we have completed the selection and design of the test system,the design of intelligent control method and odor concentration monitoring,and produced the finished test system.The selection and design of the test system includes the selection and design of spray tower,biofilter and activated carbon tank,the selection of UV photolysis equipment and plasma equipment,and the design of the overall process of the test system.The results of this study can provide some reference for the management of odorous gases in manure storage areas of livestock farms.The odor removal process testing system has certain guiding significance for selecting odor removal processes and operating parameters in different odor environments,and the testing system has a promising application prospect. |
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