College of Agriculture Luiz de Queiroz, São Paulo University - ESALQ-USP, Av. Pádua Dias, 11, 13418-900, Piracicaba, SP, Brazil.
College of Agriculture Luiz de Queiroz, São Paulo University - ESALQ-USP, Av. Pádua Dias, 11, 13418-900, Piracicaba, SP, Brazil.
J Environ Manage. 2020 Oct 15;272:111072. doi: 10.1016/j.jenvman.2020.111072. Epub 2020 Jul 17.
Animal manure is an important source of nutrients for crop production, but environmental issues can restrict its direct use. Thermochemical processing these manures may be an alternative to concentrate nutrients and reduce the final volume for agriculture application. We aimed here to evaluate the viability of extracting nutrients from chicken manure using a thermochemical process which reduces the volume of transported nutrients, targeting phosphorus (P) recovery as precipitated struvite, without add external source of P. The extraction of nutrients from poultry manure was performed in water, followed by a thermochemical treatment of the solid phase by incineration and acidulation of the resulting ash. Struvite was produced from the acidified ash extract after supplementation with Mg and regulating the pH (~8.5) by KOH addition. The recovery efficiency of P from the poultry manure and incorporation into struvite was 90%. The final product was a multi-nutrient fertilizer with high macronutrient levels (P, K, Mg and S) and low micronutrient content when compared to fresh manure, as well as lower levels of heavy metals, potentially harmful for the environment. The precipitated product obtained here is composed of struvite-NH and struvite-K, alongside appreciable quantities of potassium sulphate and hydroxyapatite carbonate. Overall, we conclude that poultry manure represents a viable source of P and N for struvite production resulting in a nutrient-rich, pathogen-free inorganic fertiliser suitable for widespread use in agriculture.
动物粪便是农作物生产的重要养分来源，但环境问题可能会限制其直接使用。对这些粪便进行热化学处理可能是一种浓缩养分并减少农业应用最终体积的替代方法。我们旨在评估使用热化学过程从鸡粪中提取养分的可行性，该过程可减少运输养分的体积，目标是回收磷（P）作为沉淀的鸟粪石，而无需添加外部 P 源。首先在水中从家禽粪便中提取养分，然后通过焚烧固相并酸化所得灰烬进行热化学处理。在用 Mg 补充并通过添加 KOH 调节 pH（约 8.5）后，从酸化的灰烬提取物中生产出鸟粪石。从家禽粪便中回收 P 并掺入鸟粪石的效率为 90%。最终产品是一种多养分肥料，与新鲜粪便相比，其大量营养素（P、K、Mg 和 S）水平较高，而微量元素含量较低，且重金属含量较低，对环境潜在危害较小。这里获得的沉淀产物由鸟粪石-NH 和鸟粪石-K 以及相当数量的硫酸钾和羟基磷灰石碳酸盐组成。总体而言，我们得出结论，家禽粪便代表了用于鸟粪石生产的 P 和 N 的可行来源，可生产出富含养分、无病原体的无机肥料，适合广泛用于农业。
