231 Mobile Session LIFT Innovative Advanced Primary Treatment for the Utility of the Future

Transcription

1 231 Mobile Session LIFT Innovative Advanced Primary Treatment for the Utility of the Future Jim Fitzpatrick Ravi George Onder Caliskaner

2 Clarification alternatives Settling Based Filtration Based Flotation Based 1. Conventional Settling 1. Shallow Granular Media 1. Conventional Rectangular, Circular, Square, RTB, Shaft Floatables Removal 2. Vortex (Swirl Concentrator) 2. Deep Granular Media Skimmers, Scum baffles 3. Lamella Settler 4. Chemically Enhanced Settling a. Conventional Basin b. Sequencing Batch e.g. ClearCove Flatline EPT c. Lamella Settler d. Solids Contact / Recirculation e.g. DensaDeg, CONTRAFAST e. Ballasted Flocculation Microsand (e.g. ACTIFLO, RapiSand ) Magnetite (e.g CoMag ) 5. Suspended Growth Contact BIOACTIFLO, BioMag, Bio CES 3. Microscreens, Woven Media Salsnes Filter, Eco MAT Filter 4. Floating Media MetaWater HRFS, BKT BBF F 5. Pile Cloth Media Aqua Aerobic Systems 6. Compressible Media Fuzzy Filter, WWETCO FlexFilter 7. Fixed Film Contact Biological Aerated Filter (BAF), BioFlexFilter 2. Dissolved Air Flotation (DAF) 3. Polymer aided DAF Various suppliers 4. Biocontact + DAF Captivator Primary Removal Equivalent * Small Footprint (High Rate Treatment) Enhanced Removal * If coagulation/flocculation provided, then HRT EHRT

3 Enhanced primary removal Remove colloidal organics Non settleable TSS (TSS non ) COD Fup TSS ISS BOD 5 Soluble Particulate BOD = 0.58 * COD Fus - Non-biodegradable soluble Fbs - Rapidly degradable soluble fraction Fsd - Slowly degradable fraction Particulate Colloidal Fac Fus Fsd Fbs CODp = 1.48 * VSS X biod. particulate X unbiod. part Fac - Fraction of Fbs that is SCVFA Fxsd - Fraction of Fsd that is particulate Fup - Non-biodegradable particulate fraction

4 Why? Ballasted Flocculation Chemically Enhanced Settling Compressible Media Filtration Primary Treatment Less required energy TSS & BOD = O 2 Smaller effluent particle size More energy recovery potential VSS capture = be er carbon management PS:WAS ra o = easier diges on

5 How? Gravimetric Particle Conditioning Flotation Filtration* Surface Charge Neutralization Coagulation Co precipitation Sieving (Surface) Flocculation Adsorption Sedimentation Adsorption (Depth) * May require particle conditioning, depends upon waste and filter type.

6 Chemically enhanced settling (CES) 1500 BC Chemical coagulation by Egyptians 1740 AD Paris sewage treatment Today Drinking water, stormwater, dilute wastewaters, reduce bio treatment load 2007 CES Trials at 75 th & Nall (Johson County, KS) No Chemicals After Chemical Dosing TSS non removal Alkalinity consumption Potential SOR up to ~8,000 gpd/ft 2 (NEORSD, 2015) Full scale pilot to confirm hydraulics and effective SOR Final Effluent

7 CES generally involves 3 or 4 steps 1. Coagulant Addition. Rapid mix. Add metal salt and/or cationic polymer to break colloids (de emulsify) 2. Flocculant Addition. Rapid mix. Add anionic or nonionic polymer. Optional if steps 1 and 3 are ideal. 3. Flocculation. Medium to low turbulence. Build floc and sweep small particles into floc. Enhance floc settling. Turbulence 4. Settling. Non turbulent quiescent zone. Separate solids from liquids.

8 A few examples of high rate CES

9 Some high rate filtration options offer similar effluent quality as CES Compressible media Pile cloth media without chemicals

10 Emerging primary DAF 120 MLD (32 mgd) Agua Nueva WRF Aerial Photo and Process Flow Diagram (Johnson et al., 2014)

11 If you prefer charts and numbers Source: WEF (2014) Wet Weather Design and Operation in Water Resource Recovery Facilities

12 Recent guidance includes

13 231 Mobile Session LIFT Innovative Advanced Primary Treatment for the Utility of the Future Jim Fitzpatrick (913) Ravi George (571) Onder Caliskaner (916)