e-Bio Center, Department of Environmental Science and Policy, University of Milan, Via Celoria 2, 20133 Milan, Italy.
Separation & Conversion Technology, Flemish Institute for Technological Research (VITO), Boeretang 200, 2400 Mol, Belgium.
Bioresour Technol. 2019 Apr;277:117-127. doi: 10.1016/j.biortech.2019.01.039. Epub 2019 Jan 9.
The aim of this work were to study terracotta-based porous air-water separators (4 mm 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.
本研究旨在考察基于赤陶土的多孔气水分离器（厚度 4mm）在微生物回收细胞（MRC）中的应用，该细胞以牛粪（CM）、猪粪（SM）和乳废水（DW）为进料。在超过 125 天的时间里，除了去除 60-90%的可溶性 COD 外，废水中的主要营养物质（C、N、P、K、Fe、Mn、Ca、Mg）的相当大的部分被去除，并以无机盐和生物质沉积物的形式沉积在赤陶土分离器上。空气-水界面的水蒸发以及阴极 pH 值升高（10-12），由氧还原为 OH 引起，是导致沉淀的主要因素。分离器中主要营养物质的饱和量高达每公斤赤陶土 10g，主要无机污染物的浓度可忽略不计。这些材料可直接作为富含养分的固体调理剂再用于农业土壤。
