Ammonia Recovery from Digestate Using Gas-Permeable Membranes: A Pilot-Scale Study

Environments

Matías B. Vanotti¹  Beatriz Molinuevo-Salces²  María Cruz García-González²  Berta Riaño² 

[1] Agricultural Research Service, Coastal Plains Soil, Water and Plant Research Center, United States Department of Agriculture, 2611 W. Lucas St., Florence, SC 29501, USA;Agricultural Technological Institute of Castilla y León. Ctra. Burgos, km. 119, 47071 Valladolid, Spain;

关键词: anaerobic digestion;    digestate;    gas-permeable membranes;    ammonia recovery;   

DOI  :  10.3390/environments8120133

来源: DOAJ

【 摘 要 】

The reduction and recovery of nitrogen (N) from anaerobically digested manure (digestate) is desirable to mitigate N-related emissions, mainly ammonia and nitrate, derived from digestate land application in nutrient-saturated zones. This work reports the results of a gas-permeable membrane (GPM) pilot-scale plant to recover ammonia from digestate in the framework of the EU project Ammonia Trapping. The total ammonia nitrogen (TAN) concentration in digestate was reduced by 34.2% on average (range 9.4–57.4%). The recovery of TAN in the trapping solution in the form of a (NH₄)₂SO₄ solution averaged 55.3% of the removed TAN, with a TAN recovery rate of 16.2 g N m⁻² d⁻¹ (range between 14.5 and 21.0 g N m⁻² d⁻¹). The TAN concentration in the trapping solution achieved a value of up to 35,000 mg N L⁻¹. The frequent change of the trapping solution has been proven as an efficient strategy to improve the overall performance of the GPM technology.

【 授权许可】

Unknown