Sea salt bittern-driven forward osmosis for nutrient recovery from black water: A dual waste-to-resource innovation via the osmotic membrane process  

作　　者：Wenchao Xue May Zaw Xiaochan An Yunxia Hu Allan Sriratana Tabucanon 

机构地区：[1]Department of Energy,Environment and Climate Change,School of Environment,Resources and Development,Asian Institute of Technology,P.O.Box 4,Klong Luang,Pathumthani 12120,Thailand [2]State Key Laboratory of Separation Membranes and Membrane Processes,School of Materials Science and Engineering,Tianjin Polytechnic University,Tianjin 300387,China [3]Faculty of Environment and Resource Studies,Mahidol University,Nakhon Pathom 71370,Thailand

出　　处：《Frontiers of Environmental Science & Engineering》2020年第2期197-206,共10页环境科学与工程前沿（英文）

基　　金：the support of the National Natural Science Foundation o f China(Grant No.51708408);the Asian Institute of Technology Research Initiation Fund.

摘　　要：A dual“waste-to-resource”innovation in nutrient enrichment and recovery from domestic black water using a sea salt bittern(SSB)-driven forward osmosis(FO)process is proposed and demonstrated.The performance of SSB as a“waste-to-resource”draw solution for FO was first evaluated.A synthetic SSB-driven FO provided a water flux of25.67±3.36 L/m2 h,which was 1.5-1.7 times compared with synthetic seawater,1 M NaCl,and 1M MgCL.Slightly compromised performance regarding reverse solute selectivity was observed.In compensation,the enhanced reverse diffusion of Mg+suggested superior potential in terms of recovering nutrients in the form of struvite precipitation.The nutrient enrichment was performed using both the pre-filtered influent and effluent of a domestic septic tank.Over 80%of phosphate-P recovery was achieved from both low-and high-strength black water at a feed volume reduction up to 80%^90%.With an elevated feed pH(~9),approximately 60%-85%enriched phosphate-P was able to be recovered in the form of precipitated stuvite.Whereas the enrichment performance of total Kjeldahl nitrogen(TKN)largely differed depending on the strength of black water.Improved concentration factor(i.e.,3-folds)and retention(>60%)of TKN was obtained in the high-nutrient-strength black water at a feed volume reduction of 80%,in comparison with a weak TKN enrichment observed in low-strength black water.The results suggested a good potential for nutrient recovery based on this dual“waste-to-resource”FO system with proper management of membrane cleaning.

关 键 词：Forward osmosis Sea SALT BITTERN BLACK water NUTRIENT recovery pH 

分 类 号：X703[环境科学与工程—环境工程]