NUTRIENTS RECOVERY COMBINED WITH DIRECT MEMBRANE FILTRATION (DMF) OF MUNICIPAL WASTEWATER FOR RECOVERY OF ORGANIC MATTER

Abstract

 Organic matter and nutrients in municipal wastewater are important resources to be recovered. Direct membrane filtration (DMF) can efficiently recover and concentrate organic matter in municipal wastewater. In most of the previous studies investigating DMF, recovery of nutrients in the treated water (permeate) was not considered. In this study, phosphate ion adsorption was attempted in the pretreatment of DMF in which microbial carriers with zirconium-based phosphate ion adsorbent were placed. As for recovery of ammonium ions in the permeate, use of poly(sodium acrylate) was examined. Experiments were conducted with real municipal wastewater and the results showed that 75% of the phosphate ion and 80% of the ammonium ions could be recovered. The recovery of ammonium ions could be further improved by using nanofiltration that could eliminate the effect of coexisting multivalent ions.