title: Effective water content reduction in sewage wastewater sludge using magnetic nanoparticles.
abstract: The present work compares the use of three flocculants for sedimentation of sludge and sludge water content from sewage wastewater i.e. magnetic iron oxide nanoparticles (MION), ferrous sulfate (chemical) and Moringa crude extract (protein). Sludge water content, wet/dry weight, turbidity and color were performed for, time kinetics and large-scale experiment. A 30% reduction of the sludge water content was observed when the wastewater was treated with either protein or chemical coagulant. The separation of sludge from wastewater treated with MION was achieved in less than 5min using an external magnet, resulted in 95% reduction of sludge water content. Furthermore, MION formed denser flocs and more than 80% reduction of microbial content was observed in large volume experiments. The results revealed that MION is efficient in rapid separation of sludge with very low water content, and thus could be a suitable alternative for sludge sedimentation and dewatering in wastewater treatment processes.
authors.affiliation: Royal Institute of Technology (KTH), School of Biotechnology, 106 91 Stockholm, Sweden.
authors.forename: Ramnath
authors.initials: R
authors.lastname: Lakshmanan
authors.affiliation: Royal Institute of Technology (KTH), School of Biotechnology, 106 91 Stockholm, Sweden. Electronic address: gunar@biotech.kth.se.
authors.forename: Gunaratna
authors.initials: G
authors.lastname: Kuttuva Rajarao
mesh_terms: D003116:Color; D005427:Flocculation; D019015:Geologic Sediments / Q000737:chemistry; D007700:Kinetics; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D009391:Nephelometry and Turbidimetry; D012722:Sewage / Q000737:chemistry*; D013997:Time Factors; D062065:Wastewater / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D058185:Magnetite Nanoparticles; D012722:Sewage; D062065:Wastewater; D014867:Water
keywords: Chemical flocculent; Coagulant protein; Magnetic nanoparticles; Sewage wastewater; Sludge