Integrating gravity-driven ceramic membrane filtration with hydroponic system for nutrient recovery from primary municipal wastewater  

作　　者：Megan Elizabeth Wiegmann Ke Zhao Selina Hube Liya Ge Grzegorz Lisak Bing Wu 

机构地区：[1]Faculty of Civil and Environmental Engineering,University of Iceland,Hjardarhagi 2-6,IS-107,Reykjavik,Iceland [2]Residues and Resource Reclamation Centre,Nanyang Environment and Water Research Institute,Nanyang Technological University,1 Cleantech Loop,CleanTech One,637141,Singapore [3]School of Civil and Environmental Engineering,Nanyang Technological University,639798,Singapore

出　　处：《Journal of Environmental Sciences》2024年第12期91-102,共12页环境科学学报（英文版）

摘　　要：In this study,a gravity-driven membrane(GDM)filtration system and hydroponic system(cultivating basil and lettuce)were combined for nutrient recovery from primary municipal wastewater.The GDM system was optimized by increasing the periodic air sparging flow rate from 1 to 2 L/min(∼15 hr per 3-4 days),resulting in a∼52%reduction of irreversible fouling.However,the total fouling was not alleviated,and the water productivity remained comparable.The GDM-filtrated water was then delivered to hydroponic systems,and the effects of hydroponic operation conditions on plant growth and heavy metal uptake were evaluated,with fertilizer-and tap water-based hydroponic systems and soil cultivation sys-tem(with tap water)for comparison.It was found that(i)the hydroponic system under batchmode facilitated to promote vegetable growth with higher nutrient uptake rates com-pared to that under flow-through feed mode;(ii)a shift in nutrient levels in the hydroponic system could impact plant growth(such as plant height and leaf length),especially in the early stages.Nevertheless,the plants cultivated with the GDM-treated water had compara-ble growth profiles to those with commercial fertilizer or in soils.Furthermore,the targeted hazard quotient levels of all heavy metals for the plants in the hydroponic system with the treated water were greatly lower than those with the commercial fertilizer.Especially,com-pared to the lettuce,the basil had a lower heavy metal uptake capability and displayed a negligible impact on long-term human health risk,when the treated water was employed for the hydroponic system.

关 键 词：Air sparging Heavy metal FERTILIZER Membrane fouling Plant growth 

分 类 号：X703[环境科学与工程—环境工程]