Hydrogen sulfide (H₂S) emissions from midwestern United States dairy anaerobic waste lagoons are episodic and seasonal. Emissions were modeled using an inverse diffusion model in conjunction with measured concentrations and turbulence. The potential for lagoon mixing was estimated by the Brunt frequency using a theoretical Fourier series temperature profile model constructed from measured air and lagoon temperatures. Annual H₂S emissions from the dairy parlor and holding area liquid waste, based on 318 d of measurement, were 212 g m^–2 or 807 g head of cattle^–1. Hydrogen sulfide emissions were highest in the spring and the fall. Eleven days with emissions >7 g d^–1 head^–1 accounted for 25% of the annual emissions. Shear mixing appeared to dominate the mixing in the lagoon when the lagoon was estimated to be nearly isothermal. Wind shear correlated with significantly greater daily mean emissions. The H₂S emissions from this lagoon appeared to result from a series of processes; biogenic production of H₂S in the sludge, H₂S-enriched bubbles rise through the lagoon by buoyancy and wind shear induced mixing, and bubbles bursting at the surface either due to desiccation of the bubbles or surface disturbances induced by wind and precipitation.

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美国中西部厌氧乳制品泻湖硫化氢排放的变化

美国中西部乳制品厌氧废物泻湖的硫化氢 (H ₂ S) 排放是偶发性和季节性的。使用逆扩散模型结合测量的浓度和湍流对排放进行建模。使用从测量的空气和泻湖温度构建的理论傅立叶级数温度分布模型，通过布伦特频率估计泻湖混合的可能性。基于 318 天的测量，奶制品店和饲养区液体废物的年H ₂ S 排放量为 212 克^–2或 807 克牛^–1头。硫化氢排放量在春季和秋季最高。排放量 >7 gd ^–1 head ^{–1 的}11 天占年排放量的25%。当泻湖估计接近等温时，剪切混合似乎在泻湖中占主导地位。风切变与显着更高的日平均排放量相关。这个泻湖的 H ₂ S 排放似乎是由一系列过程造成的；污泥中 H ₂ S 的生物生产，富含H ₂ S 的气泡通过浮力和风切变引起的混合上升通过泻湖，由于气泡的干燥或风和降水引起的表面扰动，气泡在表面破裂。