> Detailanzeige

Yadai, Tomohiro; Suzuki, Yoshihiro

Development of softening and ballasted flocculation as a pretreatment process for seawater desalination through a reverse osmosis membrane

Literatur-
verwaltung

Zur
Merkliste

Lösche von
Merkliste

Per Whatsapp teilen

Schließen

Merkliste



Sie können Bookmarks mittels Listen verwalten, loggen Sie sich dafür bitte in Ihr SLUB Benutzerkonto ein.
  • Medientyp: E-Artikel
  • Titel: Development of softening and ballasted flocculation as a pretreatment process for seawater desalination through a reverse osmosis membrane
  • Beteiligte: Yadai, Tomohiro; Suzuki, Yoshihiro
  • Erschienen: Springer Science and Business Media LLC, 2023
  • Erschienen in: npj Clean Water, 6 (2023) 1
  • Sprache: Englisch
  • DOI: 10.1038/s41545-023-00226-0
  • ISSN: 2059-7037
  • Entstehung:
  • Anmerkungen:
  • Beschreibung: <jats:title>Abstract</jats:title><jats:p>Efficient desalination through a reverse osmosis (RO) membrane requires the prior removal of blockade-causing substances from raw seawater. To achieve ultrahigh-speed processing of a pretreatment process for seawater RO desalination, we combine traditional softening with ballasted flocculation (SBF) for Ca<jats:sup>2+</jats:sup> and Mg<jats:sup>2+</jats:sup> removal. An alkaline mixture of Ca(OH)<jats:sub>2</jats:sub> and Na<jats:sub>2</jats:sub>CO<jats:sub>3</jats:sub> was the most suitable softening agent for Ca<jats:sup>2+</jats:sup> and Mg<jats:sup>2+</jats:sup> removal with a reduced amount of generated sludge. This softening treatment simultaneously removed the suspended solids and bacteria from actual seawater. The settling velocity of the suspended solids generated via seawater softening was extremely low. Under the optimum conditions for desalinating actual seawater using an anionic polymer flocculant and microsand, the settling velocity exceeded 3.5 cm/s, 833 times higher than that of softening without ballasted flocculation. The amount of sludge after standing for 3 min was 76.5% lower in SBF than in conventional softening. The silt density index of the treated seawater met the water-supply standard of RO membranes (i.e., &lt;3.0). Furthermore, the SBF-generated sludge exhibited considerably improved dewatering property than the sludge obtained via conventional softening. SBF can efficiently and quickly remove the causative substances of RO membrane fouling from seawater, thereby improving the treatability of generated sludge. SBF provides a new pretreatment process for seawater desalination using RO membranes.</jats:p>
  • Zugangsstatus: Freier Zugang