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Description: Brushite Recovery from Autothermal Thermophilic Aerobic Digestion (ATAD) Sludge to...
Brushite Recovery from Autothermal Thermophilic Aerobic Digestion (ATAD) Sludge to Improve Dewatering Characteristics
Abstract
The dewatering challenges and large chemical costs associated with dewatering sludges from Autothermal thermophilic aerobic digestion (ATAD) has limited the use of this technology. A small Water Resource Recovery Facility (WRRF) in Colorado spends over $500,000 per year on dewatering ATAD sludge. A new approach is proposed for recovery of phosphorus (P) from ATAD sludge with brushite recovery which results in improvements in dewatering characteristics. Removal of Ortho-P and reduction in Extracellular Polymeric Substances (EPS) with acidification, coupled with Ortho-P removal improves dewatering of ATAD sludge. Lab testing, process analysis, and modeling was conducted for P recovery with CalPrexTM. The indicated low quantity of chemicals required for phosphorus recovery. Lab testing with ATAD sludge showed 60% less polymer requirement for dewatering and 98% soluble phosphorus removal. The economic analysis comparing the current practice with the proposed P recovery (with brushite) showed that this new approach is capable of reducing the WRRF Operation & Maintenance (O&M) cost.
A new approach is proposed for recovery of phosphorus from ATAD sludge with brushite recovery which results in improvements in dewatering characteristics. Removal of Ortho-P with acidification, coupled with CalPrexTM showed promising results in improving dewatering of ATAD sludge. Lab testing, process analysis, and modeling was conducted for which indicated low quantity of chemicals required for phosphorus recovery. Lab testing with ATAD sludge showed 60% less polymer requirement for dewatering and 98% soluble phosphorus removal. The economic analysis comparing the current practice with the proposed P recovery showed that this approach is capable of reducing the WRRF O&M cost.
SpeakerArabi, Sara
Presentation time
16:00:00
16:15:00
Session time
16:00:00
17:30:00
SessionTechnology Advancement in Sidestream Phosphorus Recovery
Session number113
TopicBiosolids and Residuals, Facility Operations and Maintenance, Nutrients
TopicBiosolids and Residuals, Facility Operations and Maintenance, Nutrients
Author(s)
Sara Arabi
Author(s)S. Arabi1; T. Gulliver1; C. Bye2; M.E. Tabanpour3; J. Wippo4;
Author affiliation(s)HDR, Chicago, IL 1EnviroSim, Hamilton, ON, CA 2Centrisys/CNP, Kenosha, WI 3Thermal Process Systems, Crown Point, IN 4
SourceProceedings of the Water Environment Federation
Document typeConference Paper
PublisherWater Environment Federation
Print publication date Oct 2021
DOI10.2175/193864718825158020
Volume / Issue
Content sourceWEFTEC
Copyright2021
Word count14

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