Journal
BIORESOURCE TECHNOLOGY
Volume 277, Issue -, Pages 117-127Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.01.039
Keywords
Nutrients recovery; Wastewater treatment; Microbial electrochemical technologies; Microbial recycling cells; Terracotta
Funding
- SIR 2014 Grant, Italian Ministry of University and Research (MIUR) by the Research Fund for the Italian Electrical System [RBSI14JKU3]
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The aim of this work were to study terracotta-based porous air-water separators (4mm thickness) in microbial recycling cells (MRCs) fed with cow manure (CM), swine manure (SM) and dairy wastewater (DW). Over 125 days, besides the removal of 60-90% of soluble-COD, considerable fractions of the main macronutrients (C, N, P, K, Fe, Mn, Ca, Mg) were removed from the wastewater and deposited on the terracotta separators as both inorganic salts and biomass deposits. Water evaporation at air-water interface as well as the high cathodic pH (10-12), induced by oxygen reduction to OH-, were the predominant factors leading to precipitation. The separators were saturated of up to 10 g per kg of terracotta of the main macronutrients, with negligible concentrations of the main inorganic contaminants. These materials could be directly reused as nutrients-enriched solid conditioners for agricultural soils.
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