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Open AccessArticle

Effect of Pretreatment on Hydraulic Performance of the Integrated Membrane Process for Concentrating Nutrient in Biogas Digestate from Swine Manure

1
Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
2
Department of Biological and Agricultural Engineering, University of Arkansas, Fayetteville, AR 72701, USA
*
Author to whom correspondence should be addressed.
Membranes 2020, 10(10), 249; https://doi.org/10.3390/membranes10100249
Received: 24 August 2020 / Revised: 13 September 2020 / Accepted: 14 September 2020 / Published: 23 September 2020
(This article belongs to the Special Issue Membranes: 10th Anniversary)
Nanofiltration (NF) or reverse osmosis (RO) process has been widely applied for concentrating nutrient in biogas digestate. However, efficient pretreatment is key to the sustainable operation of NF or RO. In this study, the combination of NF and RO for concentrating biogas digestate was compared using different pretreatments of hollow fiber ultrafiltration membrane (HFUFM) and ceramic membrane (CUFM). Pilot-scale batch tests were conducted (500 L). CUFM showed a higher membrane flux than HFUFM (100 ~ 180 L·(m2·h)−1 vs. 17 ~ 35 L·(m2·h)−1), but they showed little impact on the NF + RO process. Membrane fluxes of NF and RO were 20 ~ 48 L·(m2·h)−1 and 16 ~ 40 L·(m2·h)−1, respectively. In the RO permeates, the removal rates of total suspended solids (TSS), total solids (TS), chemical oxygen demand (COD), total nitrogen (TN), NH4+-N, and Cl were above 91%. In the concentrates, TN and total potassium (TK) were concentrated by 1.60 and 2.00 folds in the NF stage, and by 2.10 and 2.30 folds in the RO stage. Further attention should be paid to the antibiotics risks in the concentrates before they are utilized as plant fertilizers. View Full-Text
Keywords: pretreatment; NF + RO; permeate; concentrate; biogas digestate pretreatment; NF + RO; permeate; concentrate; biogas digestate
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Zhan, Y.; Yin, F.; Yue, C.; Zhu, J.; Zhu, Z.; Zou, M.; Dong, H. Effect of Pretreatment on Hydraulic Performance of the Integrated Membrane Process for Concentrating Nutrient in Biogas Digestate from Swine Manure. Membranes 2020, 10, 249.

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