Animal production inevitably causes the emission of greenhouse gases and the generation of large amounts of slurry, both representing a serious environmental problem. Photosynthetic microorganisms such as microalgae and cyanobacteria have been proposed as alternative strategies to bioremediate agricultural waste while consuming carbon dioxide and producing valuable biomass. The current study assessed the potential of the microalga Scenedesmus sp. to remove nutrients from piggery wastewater (PWW) and the influence of the microalga on the microbial consortia. Maximum N-NH₄⁺ consumption was 55.3 ± 3.7 mg·L⁻¹·day⁻¹ while P-PO₄³⁻ removal rates were in the range 0.1–1.9 mg·L⁻¹·day⁻¹. N-NH₄⁺ removal was partially caused by the action of nitrifying bacteria, which led to the production of N-NO₃⁻. N-NO₃⁻ production values where lower when microalgae were more active. This work demonstrated that the photosynthetic activity of microalgae allows us to increase nutrient removal rates from PWW and to reduce the coliform bacterial load of the effluent, minimising both their environmental impact and health risks. Microalgae assimilated part of the N-NH₄⁺ present in the media to produce biomass and did not to convert it into N-NO₃⁻ as in traditional processes.

中文翻译：

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微藻在猪粪营养回收中的作用

动物生产不可避免地导致温室气体的排放和大量泥浆的产生，这都代表了严重的环境问题。已经提出了光合微生物，例如微藻和蓝细菌，作为生物修复农业废弃物同时消耗二氧化碳并产生有价值的生物质的替代策略。目前的研究评估了微藻Scenedesmus sp。的潜力。去除养猪废水（PWW）中的养分以及微藻对微生物群落的影响。N-NH ₄ ^+的最大消耗量为55.3±3.7 mg·L ^-1 ·天^-1，而P-PO ₄ ^3-的去除率在0.1–1.9 mg·L的范围内^-1 ·天^-1。N-NH ₄ ⁺去除部分被硝化细菌，这导致了生产N-NO的作用引起的₃ ^- 。N-NO ₃ ^-的生产值时，微藻类是多种活性，其中较低。这项工作表明，微藻的光合活性使我们能够提高PWW的营养去除率并减少废水中大肠菌的细菌含量，从而将其对环境的影响和健康风险最小化。微藻同化N-NH的部分₄ ⁺存在于培养基中，以产生生物质，并没有将其转化为N-NO ₃ ^-如在传统工艺。