Seawater-driven forward osmosis for enriching nitrogen and phosphorous in treated municipal wastewater: effect of membrane properties and feed solution chemistry.

Seawater-driven forward osmosis (FO) is considered to be a novel strategy to concentrate nutrients in treated municipal wastewater for further recovery as well as simultaneous discharge of highly purified wastewater into the sea with low cost. As a preliminary test, the performance of FO membranes in concentrating nutrients was investigated by both batch experiments and model simulation approaches. With synthetic seawater as the draw solution, the dissolved organic carbon, phosphate, and ammonia in the effluent from a membrane bioreactor (MBR) treating municipal wastewater were 2.3-fold, 2.3-fold, and 2.1-fold, respectively, concentrated by the FO process with approximately 57% of water reduction. Most of the dissolved components, including trace metals in the MBR effluent, were highly retained (>80%) in the feed side, indicating high water quality of permeate to be discharged. The effect of membrane properties on the nutrient enrichment performance was investigated by comparing three types of FO membranes. Interestingly, a polyamide membrane possessing a high negative charge demonstrated a poor capability of retaining ammonia, which was hypothesized because of an ion exchange-like mechanism across the membrane prompted by the high ionic concentration of the draw solution. A feed solution pH of 7 was demonstrated to be an optimum condition for improving the overall retention of nutrients, especially for ammonia because of the pH-dependent speciation of ammonia/ammonium forms. The modeling results showed that higher than 10-fold concentrations of ammonia and phosphate are achievable by seawater-driven FO with a draw solution to feed solution volume ratio of 2:1. The enriched municipal wastewater contains nitrogen and phosphorous concentrations comparable with typical animal wastewater and anaerobic digestion effluent, which are used for direct nutrient recovery.

[1]  Chuyang Y. Tang,et al.  Mining nutrients (N, K, P) from urban source-separated urine by forward osmosis dewatering. , 2014, Environmental science & technology.

[2]  B. Lind,et al.  Nutrient recovery from human urine by struvite crystallization with ammonia adsorption on zeolite and wollastonite. , 2000 .

[3]  D.J.H. Harmsen,et al.  Membrane fouling and process performance of forward osmosis membranes on activated sludge , 2008 .

[4]  Matthias Wessling,et al.  Nutrient removal by NF and RO membranes in a decentralized sanitation system. , 2005, Water research.

[5]  Tzahi Y Cath,et al.  Forward osmosis for concentration of anaerobic digester centrate. , 2007, Water research.

[6]  Yonghui Song,et al.  Nutrients removal and recovery by crystallization of magnesium ammonium phosphate from synthetic swine wastewater. , 2007, Chemosphere.

[7]  Chuyang Y. Tang,et al.  Boric acid permeation in forward osmosis membrane processes: modeling, experiments, and implications. , 2011, Environmental science & technology.

[8]  P. Jaouen,et al.  Mechanism of nitrate ions transfer in nanofiltration depending on pressure, pH, concentration and medium composition , 2004 .

[9]  Amy E. Childress,et al.  The forward osmosis membrane bioreactor: A low fouling alternative to MBR processes , 2009 .

[10]  S. Loeb,et al.  Effect of porous support fabric on osmosis through a Loeb-Sourirajan type asymmetric membrane , 1997 .

[11]  R. Baker,et al.  Membranes for power generation by pressure-retarded osmosis , 1981 .

[12]  E. Drioli,et al.  Recent advances on membrane processes for the concentration of fruit juices: a review , 2004 .

[13]  Menachem Elimelech,et al.  A novel ammonia-carbon dioxide forward (direct) osmosis desalination process , 2005 .

[14]  Menachem Elimelech,et al.  Reverse draw solute permeation in forward osmosis: modeling and experiments. , 2010, Environmental science & technology.

[15]  Tomonori Saito,et al.  Zeta potential of ion-conductive membranes by streaming current measurements. , 2011, Langmuir : the ACS journal of surfaces and colloids.

[16]  Robert L McGinnis,et al.  Desalination by ammonia–carbon dioxide forward osmosis: Influence of draw and feed solution concentrations on process performance , 2006 .

[17]  H. Ng,et al.  Performance of forward (direct) osmosis process: membrane structure and transport phenomenon. , 2006, Environmental science & technology.

[18]  B. Lind,et al.  Volume reduction and concentration of nutrients in human urine , 2001 .

[19]  Jincai Su,et al.  Exploration of polyelectrolytes as draw solutes in forward osmosis processes. , 2012, Water research.

[20]  M. Elimelech,et al.  Organic fouling of forward osmosis membranes: Fouling reversibility and cleaning without chemical reagents , 2010 .

[21]  Tzahi Y. Cath,et al.  Membrane contactor processes for wastewater reclamation in space: II. Combined direct osmosis, osmotic distillation, and membrane distillation for treatment of metabolic wastewater , 2005 .

[22]  Menachem Elimelech,et al.  High performance thin-film composite forward osmosis membrane. , 2010, Environmental science & technology.

[23]  Victor Yangali-Quintanilla,et al.  Rejection of micropollutants by clean and fouled forward osmosis membrane. , 2011, Water research.

[24]  Yong-Hui Song,et al.  Nutrients removal and recovery from anaerobically digested swine wastewater by struvite crystallization without chemical additions. , 2011, Journal of hazardous materials.

[25]  Navin K. Rastogi,et al.  Forward osmosis for the concentration of anthocyanin from Garcinia indica Choisy , 2010 .

[26]  Amy E. Childress,et al.  Forward osmosis: Principles, applications, and recent developments , 2006 .

[27]  Sherub Phuntsho,et al.  Blended fertilizers as draw solutions for fertilizer-drawn forward osmosis desalination. , 2012, Environmental science & technology.

[28]  T. Bilstad.  Nitrogen separation from domestic wastewater by reverse osmosis , 1995 .

[29]  A. Schäfer,et al.  Impact of pH on the removal of fluoride, nitrate and boron by nanofiltration/reverse osmosis , 2010 .

[30]  F. Wong,et al.  Effect of feed pH on an integrated membrane process for the reclamation of a combined rinse water from electroless nickel plating , 2003 .

[31]  J. McCutcheon,et al.  Internal concentration polarization in forward osmosis: role of membrane orientation , 2006 .

[32]  Chuyang Y. Tang,et al.  Performance of a submerged anaerobic membrane bioreactor with forward osmosis membrane for low-strength wastewater treatment. , 2014, Water research.

[33]  Chuyang Y. Tang,et al.  Coupled effects of internal concentration polarization and fouling on flux behavior of forward osmosis membranes during humic acid filtration , 2010 .

[34]  Richard M. Lueptow,et al.  Membrane rejection of nitrogen compounds. , 2001, Environmental science & technology.

[35]  Menachem Elimelech,et al.  Comparison of fouling behavior in forward osmosis (FO) and reverse osmosis (RO) , 2010 .

[36]  Menachem Elimelech,et al.  Effect of solution chemistry on the surface charge of polymeric reverse osmosis and nanofiltration membranes , 1996 .

[37]  YingHao Liu,et al.  Recovery of nitrogen and phosphorus by struvite crystallization from swine wastewater , 2011 .

[38]  Yebo Li,et al.  Nutrient recovery from wastewater streams by microalgae: Status and prospects , 2013 .

[39]  Michael Flynn,et al.  Membrane contactor processes for wastewater reclamation in space Part I. Direct osmotic concentration as pretreatment for reverse osmosis , 2005 .

[40]  S. Parsons,et al.  Struvite formation, control and recovery. , 2002, Water research.

[41]  Tzahi Y Cath,et al.  Bidirectional permeation of electrolytes in osmotically driven membrane processes. , 2011, Environmental science & technology.