A COMBINED REED BED AND FREEZING BED FILTER FOR SEPTAGE TREATMENT - PowerPoint PPT Presentation

May 08, 2023 •449 likes •633 views

1 A COMBINED REED BED AND FREEZING BED FILTER FOR SEPTAGE TREATMENT AND REUSE IN COLD CLIMATE CONDITIONS C. Kinsley, K. Kennedy, A. Crolla 2 Introductio n Septage - accumulated sludge in septic tanks ~1.2x10 6 septic systems in Ontario

1 A COMBINED REED BED AND FREEZING BED FILTER FOR SEPTAGE TREATMENT AND REUSE IN COLD CLIMATE CONDITIONS C. Kinsley, K. Kennedy, A. Crolla
2 Introductio n • Septage - accumulated sludge in septic tanks • ~1.2x10 6 septic systems in Ontario (860 000 m 3 /yr) • 60% applied directly to agricultural land • 40% co-treatment at WWTP • Ontario Ministry of Environment is committed to phasing out the land application of untreated septage
3 Reed Beds • Variation on drying bed design • Sludge is dewatered and composted in one step • Plants provide many benefits: • roots create drainage pathways • plant movement and growth breaks sludge cake • plants absorb water from sludge • oxygen transfer to the plant roots assist in the stabilization and mineralization of the sludge.
4 Combined Reed Bed-Freezing Bed Field Study Experimental Variables • Solids Loading Rate (42-144 kg TS/year) • Hydraulic Loading Rate (1.9-5.9 m/year) • Planted vs unplanted • Season (T, Precip) Unplanted Filter Reed Bed Filters
7
8 Treated Effluent Irrigation
Plant Development
10 Experiment 1: Effect of SLR on Drainage
11 Experiment 1: Effect of SLR on Drainage
12 Experiment 2: Effect of Plant Growth on Drainage
13 Design Loading Rate • Subtract ponded water from May-Nov from hydraulic loading. Year Design Hydraulic Loading Rate (mm/d) SF RB1 RB2 2007 8.4 8.5 9.5 2008 8.4 8.2 8.8 2009 10.8 7.1 8.1 Avg. ± SD 9.2 ± 1.4 7.9 ± 0.7 8.8 ± 0.7 Design Hydraulic Loading Rate = 8.6 ± 0.7 mm/d or 2.9 m/y or 75 kg/m 2 /y
14 Experiment 3: Effect of Hydraulic Load on Drainage
15 Filtrate Quality Significant effect of Period for COD, TSS, TN and TP was observed (P<0.05), while no effect for Year (P>0.05) was observed .
16 Dewatered Sludge Quality • Similar nutrient and solids content to solid dairy manure • Metals and E.coli meet biosolids standards
17 Acknowledgements • Ontario Ministry of Environment • Canadian Water Network • René Goulet Septic Tank Pumping • Canada Mortgage and Housing Corporation • Eastern Ontario Water Resources Committee
Thank you! www.orwc.uoguelph.ca

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