Nutrient Recovery from Anaerobically Digested Dairy Manure Using Dissolved Air Flotation (DAF),ACS Sustainable Chemistry & Engineering

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Nutrient Recovery from Anaerobically Digested Dairy Manure Using Dissolved Air Flotation (DAF)
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-01-22 , DOI: 10.1021/acssuschemeng.9b06419
Katherine K. Porterfield ₁ , Joshua Faulkner ₂ , Eric D. Roy _{1,

3}

Affiliation

Digestate application to soils located near anaerobic digesters can potentially contribute to nutrient loss to downstream freshwater ecosystems and associated eutrophication. However, it is cost-prohibitive to transport digestate to crop production areas further from digesters due to high water content. We evaluated the potential to recover phosphorus (P), as well as nitrogen (N) and potassium (K), from dairy manure digestate using dissolved air flotation (DAF) to separate fine solids. We measured flow rates and collected influent and effluent samples on 45 dates spanning 3.5 months from a DAF system fed by the post-screw press digestate on a Vermont dairy farm. Separated fine solids recovered during the initiation period contained 29 ± 3% of N, 71 ± 18% of P, and 11 ± 2% of K from the influent. At full operational capability, the DAF system captured 36 ± 2% of N, 85 ± 12% of P, and 11 ± 1% of K from the influent in the separated fine solids. These findings indicate that most P remaining in the post-screw press dairy manure digestate can be recovered using DAF, while remaining effluent has an expanded range of use options due to a 3-fold increase in the N:P ratio.

中文翻译：

使用溶解气浮（DAF）从厌氧消化的乳牛粪中回收营养

在厌氧消化池附近的土壤中使用Digestate可能会导致营养物质流失到下游的淡水生态系统，并引起相关的富营养化。然而，由于水含量高，将消化物从蒸煮器进一步运输到作物生产区域是成本高昂的。我们评估了使用溶解空气浮选（DAF）分离细固体从乳牛粪便消化物中回收磷（P），氮（N）和钾（K）的潜力。我们测量了流量，并在3.5个月内的45个日期（来自Vermont奶牛场的螺杆后压榨消化物供给的DAF系统）中收集了进水和出水样品。在启动期间回收的分离出的细粒固体中，进水中含有29±3％的N，71±18％的P和11±2％的K。在全面运作的能力下，DAF系统从分离出的细固体中的进水中捕获了36±2％的N，85±12％的P和11±1％的K。这些发现表明，使用DAF可以回收螺杆后压榨乳牛粪便消化物中剩余的大多数P，而由于N：P比率增加了3倍，因此剩余废水的使用范围有所扩大。

更新日期：2020-01-23

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