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Emerging Technologies Solids Removal updated 2012 Magnetite Ballasted Sedimentation Objective: Ballasted sedimentation process for enhanced removal of suspended solids. Used for tertiary treatment (including phosphorus solids removal) or high-rate treatment of overflows. Description: March 2013 Technology Summary State of Development: Innovative. The CoMagTM process uses conventional chemical coagulation and flocculation along with the addition of finely ground magnetite as a ballasting agent. The dense magnetite significantly increases the weight and settleability of chemical flocs, resulting in high-rate sedimentation. Approximately 85 percent of the settled sludge is recycled (similar to the solids contact process) to provide nucleation sites for floc development. Excess sludge is passed through a shear mill followed by a magnetic recovery drum to recover the magnetite before the nearly magnetite-free sludge is further processed. The recovered magnetite is returned to the process. BioMagTM is a similar process using magnetite addition directly to the activated sludge process to improve biological floc settleability. For more information, see the BioMagTM technology description in Chapter 3, Biological Treatment Processes. The Sirofloc process is similar to CoMagTM but involves an initial magnetite activation step and has been used to treat raw wastewater overflows. Comparison to Established Technologies: Magnetite is denser than suspended solids and sand, and it generates heavy, dense floc that settles rapidly. This allows otherwise ordinary clarifiers to be loaded at higher than typical rates while maintaining high-quality effluent. The footprint of clarifiers used with the CoMagTM process is correspondingly small (although an additional small area is required to house the magnetite recovery drum and magnetite supply). The magnetite seed is recovered from sludge using a magnet instead of gravity, so recovery efficiency is high, and magnetite make-up requirements are low. As with other processes employed to chemically precipitate phosphorus, precipitation performance is limited by kinetic and stoichiometric factors. However, the nucleation, solids contact and ballast provided by the CoMagTM process combine to allow phosphorus precipitates to be removed very effectively once they are formed. Available Cost Information: Approximate Capital Cost: Not disclosed by the vendor. Approximate O&M Costs: Not disclosed by the vendor. Vendor Name(s): CoMagTM – Siemens Industry, Inc. Water Technologies Telephone: 866-926-8420 or 724-772-1402 Web: www.water.siemens.com Sirofloc – CSIRO Locked Bag 10 Clayton South VIC 3169 Australia Telephone: +61-3-9545-2176 Fax: +61-3-9545-2175 Email: enquiries@csiro.au Key Words for Internet Search: Installation(s): CoMagTM Concord, MA Billerica, MA Maynard, MA Charlton, MA Sturbridge, MA Sirofloc Malabar STP, New South Wales, Australia No installations are in the United States Siemens CoMag, ballasted sedimentation, ballasted clarification, Concord WWTP, Sirofloc 2-14 Wastewater Treatment and In-Plant Wet Weather ManagementPDF Image | Emerging Tech for Wastewater Treatment
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