Chemical and Biological Phosphorus Removal at One of the World s Largest Water Resource Recovery Facilities

Transcription

1 Chemical and Biological Phosphorus Removal at One of the World s Largest Water Resource Recovery Facilities Glen T. Daigger 1, Wendy Barrott 2, Cheng Yang 1, Jin Yan 1, Zheyi Tian 1, Majid Kahn 2, Nancy Love 1 Presented at the 93 rd Annual Michigan Water Environment Association Conference Boyne Falls, MI June 25, Department of Civil and Environmental Engineering University of Michigan 2 Great Lakes Water Authority

2 Enhanced biological phosphorus removal (EBPR) PO 4 From wastewater Anaerobic PO 4 Aerobic Poly P Poly P PHB PHB Volatile Fatty Acids O 2

3 Configuration of the HPO Activated Sludge System is Unique and Can Contribute to Bio-P Eight and Ten Stages, Compared to Typical Three or Four Potential High OUR in Initial Stages Leading to Depressed DO Supported by Some Previous U-M Data Anaerobic/Aerobic Cycling Creates Needed Environment for Phosphorus Accumulating Organisms (PAO s) Aeration deck 1 &2 have 10 stages while 3 & 4 have 8 stages.

4 Potential for Bio-P Capability Lead to Following Project Objectives Characterize the performance and operating characteristics of the GLWA WRRF HPO bioreactors, with a particular focus on determining whether appropriate conditions are created so that the PAO s responsible for bio-p can be, and potentially are, present in the system. Incorporate the results of this assessment into the existing model (SUMO ) for the WRRF as a tool for subsequent plant optimization.

5 The Following Has Been Accomplished to Date Detailed Analysis of Five Years of Operating Data Further Characterize Wastewater Dissolved, Colloidal, Particulate BOD 5, COD, TP Characterization of HPO Bioreactor Operating Characteristics DO and Soluble Phosphorus Profile Microbiological Characterization of HPO Bioreactor Microscopic Examination SUMO Process Model Development and Calibration

6 Plant Influent Flow Varies Seasonally

7 Phosphorus (lb-p/day) TP (mg-p/l) Constituent Influent Mass Loadings Vary Independently of Influent Flow Relationship Between Plant Influent Flow and Phosphorus Loading Relationship Between Plant Influent Flow and TP Concentration TP SP Inf PE 30, , , , , , , ,000 Flow (mgd) Flow (mgd)

8 Constituent Loads are Generally Log-Normally Distributed

9 Generally, But Not Always Log-Normally Distributed

10 Raw Wastewater Characteristics Indicate Little Colloidal Organic Matter is Present Using 5 sets of data in August, when BOD test was conducted.

11 Primary Clarifier TSS Removal Performance Modeled by Linear Regression Description Model R 2 Subset 1 (<=540MGD) PE_TSS= *Flow *Inf_TSS Subset 2 (> 540 & <=775MGD) PE_TSS= *Flow *Inf_TSS *Inf_SP Subset 3 (>775 MGD) PE_TSS= *Flow *Inf_BOD Full set PE_TSS= *Flow *Inf_TSS *Inf_SP 0.919

12 Delta SP/Fe (mg-p/mg-fe) Delta SP/Fe (mg-p/mg-fe) Low Flow Conditions Adversely Impacts Chemical Phosphorus Use Efficiency > 500 mgd <500 mgd ,000 1,200 1,400 1,600 Flow (mgd) PE SP (mg-p/l)

13 Microscopic Examination Reveals Presence of PAO s in HPO ML Courtesy of Professor David Jenkins, June 10, 2017

14 Phosphate Concentration, mg-p/l Phosphate Concentration, mg-p/l Batch Reactor Results Demonstrate Phosphorus Release and Uptake Independent of Residual Ortho-P (1 of 2) Batch Test Phosphorus-Aerobic Batch Test Phosphorus-Anaerobic Time, min Time, min AER-ML AER-ML+P ANA-ML ANA-ML+C Batch Test Result of August 11, 2017

15 Phosphate Concentration, mg-p/l Phosphate Concentration, mg-p/l Batch Reactor Results Demonstrate Phosphorus Release and Uptake Independent of Residual Ortho-P (2 of 2) Batch Test Phosphorus-Aerobic Batch Test Phosphorus-Anaerobic Time, min Time, min AER-ML AER-ML+P AER-ML+C AER-ML+P+C ANA-ML ANA-ML+P ANA-ML+C ANA-ML+P+C Batch Test Result of August 11, 2017

16 DO (mg/l) Soluble Ortho-P (mg-p/l) Example Bioreactor DO and OP Profile Demonstrates Typical Bio-P Behavior DO OP Bioreactor Stage August 29,

17 SP (mg-p/l) Biological SP Removal (mg-p/l) Primary/Secondary Treatment Interaction Demonstrated by Biological Process TSP Removal Increase When More TSP Available SE PE ,000 Flow (MGD) ,000 Flow (MGD) Data

18 Process (SUMO ) Model Uses Somewhat Simplified Configuration to Reduce Run-Time Potential Improvements Incorporate Influent COD Data Dynamic Calibration Gas-Liquid Mass Transfer Assess Plant Optimization Opportunities

19 In Conclusion: Influent Wastewater Characteristics and Patterns Quantified: Seasonal Flow Pattern Non-Seasonal Loading Pattern Leads to Correlation Between Influent Concentrations and Flow Influent Wastewater Largely Particulate or Dissolved, Little Colloidal Matter Primary Clarifier Performance Characterized Flow and Influent TSS Principal Determinants of PE TSS Concentration Unusual Impact of Ferric at Low Flows (Further Investigations Needed) HPO System Exhibits Bio-P Characteristics Bioreactor DO and Soluble Ortho-P Profiles as Expected PAO s and PAO Activity Present Phosphorus Removal Interaction with Primary Clarifier Performance SUMO Process Model Developed and Calibrated Further Developments On-Going Use for Process Optimization

20 Chemical and Biological Phosphorus Removal at One of the World s Largest Water Resource Recovery Facilities Glen T. Daigger 1, Wendy Barrott 2, Cheng Yang 1, Jin Yan 1, Zheyi Tian 1, Majid Kahn 2, Nancy Love 1 Presented at the 93 rd Annual Michigan Water Environment Association Conference Boyne Falls, MI June 25, Department of Civil and Environmental Engineering University of Michigan 2 Great Lakes Water Authority