Treatment of Manure and Digestate Liquid Fractions Using Membranes: Opportunities and Challenges
Overview
Public Health
Authors
Affiliations
Manure and digestate liquid fractions are nutrient-rich effluents that can be fractionated and concentrated using membranes. However, these membranes tend to foul due to organic matter, solids, colloids, and inorganic compounds including calcium, ammonium, sodium, sulfur, potassium, phosphorus, and magnesium contained in the feed. This review paper is intended as a theoretical and practical tool for the decision-making process during design of membrane-based systems aiming at processing manure liquid fractions. Firstly, this review paper gives an overview of the main physico-chemical characteristics of manure and digestates. Furthermore, solid-liquid separation technologies are described and the complexity of the physico-chemical variables affecting the separation process is discussed. The main factors influencing membrane fouling mechanisms, morphology and characteristics are described, as well as techniques covering membrane inspection and foulant analysis. Secondly, the effects of the feed characteristics, membrane operating conditions (pressure, cross-flow velocity, temperature), pH, flocculation-coagulation and membrane cleaning on fouling and membrane performance are presented. Finally, a summary of techniques for specific recovery of ammonia-nitrogen, phosphorus and removal of heavy metals for farm effluents is also presented.
Varied Growth Media Necessitate Different Light Regimes for Indoor Duckweed Cultivation.
Redmond C, OMahoney R, Blanchard M, Coughlan N Plants (Basel). 2025; 14(3).
PMID: 39942959 PMC: 11821151. DOI: 10.3390/plants14030397.
Pig Slurry Management Producing N Mineral Concentrates: A Full-Scale Case Study.
Herrera A, DImporzano G, Clagnan E, Pigoli A, Bonadei E, Meers E ACS Sustain Chem Eng. 2023; 11(19):7309-7322.
PMID: 37213259 PMC: 10196920. DOI: 10.1021/acssuschemeng.2c07016.
Nutrient recovery and valorisation from pig slurry liquid fraction with membrane technologies.
Rodriguez-Alegre R, Zapata-Jimenez J, You X, Perez-Moya M, Sanchis S, Garcia-Montano J Sci Total Environ. 2023; 874:162548.
PMID: 36870507 PMC: 10060121. DOI: 10.1016/j.scitotenv.2023.162548.
Environmental Impact Assessment by Green Processes.
Giuliano A, Errico M, Salehi H, Avino P Int J Environ Res Public Health. 2022; 19(23).
PMID: 36497650 PMC: 9737002. DOI: 10.3390/ijerph192315575.