Setting odour impact index and developing a setback distance model for livestock farms

集约化畜牧业排放的气味和有毒气体(硫化氢和氨)已成为公众关注的问题，因为它们对环境造成影响，并可能对邻近居民的健康造成影响。确定以科学为基础的挫折距离已成为当务之急。利用气味扩散模型来预测下风向气味羽流，然后根据可接受的气味标准来确定合理的回落是一种科学的方法。源气味释放率随着动物和气候的变化而不断变化，是气味扩散模拟所需的基本数据。在气味扩散模型中，需要揭示和考虑白天和季节的气味排放分布。识别主要气味来源将有助于开发和应用针对主要来源的气味控制技术。需要建立考虑气味强度、攻击性、持久性、频率等因素的可接受气味标准(如气味影响指数)。硫化氢和氨气是有毒气体，是家畜气味的主要气味物质，需要进行量化。

Odour and toxic gas (H2S and NH3) emissions from the intensive livestock operations have become a public concern due to their environmental impact and potential health impact on neighbouring residents. Determining science-based setback distance has become an urgent need. Using odour dispersion model to predict odour plume downwind and then determine reasonable setbacks based on acceptable odour criteria is a scientific approach. Source odour emission rates, which are changing constantly with animal and climatic conations, are the basic data needed for odour dispersion modeling. The diurnal and seasonal odour emission profiles need to be revealed and considered in odour dispersion modeling. Identifying major odour sources will help development and applying odour control technologies targeting major sources. Acceptable odour criteria (such as odour impact index) considering odour intensity, offensiveness, persistence, frequency, etc., need to be established. H2S and NH3 are toxic gases and the major odorants of livestock odour and need to be quantified.