Integrated urban wastewater systems: Prediction of particle settling velocity distributions Thibaud Maruéjouls, Paul Lessard and Peter A. Vanrolleghem 7 th International Conference Sewer Processes & Networks Sheffield, UK August 28-30, 2013

 Introduction  Particle settling velocity distribution (ViCAs protocol)  Integrated model  Results  Conclusions 2 Outline

3 Intro ViCAs and Vs Integrated model Results Conclusions RIVER Separation treatment Transport Storage Biological Treatment SEWER WWTP TSS-settling This study TSS-settling Particle settling velocity distribution model (PSVDM) CSO Integrated system

 Develop an integrated model based on sedimentation measurements  Reproduce the particle settling velocity distribution (PSVD) along the system Intro ViCAs and Vs Integrated model Results Conclusions Objectives

1.6 m/h 68% 5 Chebbo and Gromaire (2009) – Journal of Environmental Engineering Fraction of particle mass with a Vs less than (%) Settling velocity Vs (m/h) Intro ViCAs and Vs Integrated model Results Conclusions ViCAs Particle settling velocity distribution

6 Fraction of particle mass with a Vs less than (%) Settling velocity Vs (m/h) Intro ViCAs and Vs Integrated model Results Conclusions ViCAs Particle settling velocity distribution Class 1 Class 2 Class 3 Class 4 Class 5 Vs1=0.03

7 Fraction of particle mass with a Vs less than (%) Settling velocity Vs (m/h) Intro ViCAs and Vs Integrated model Results Conclusions ViCAs PSVD and concentration High TSS concentration Fast PSVD Low TSS concentration Slow PSVD

8 DW WW Integrated system Inputs Fast PSVD Slow PSVD Intro ViCAs and Vs Integrated model Results Conclusions Fast PSVD Slow PSVD

9 Simulated PSVD compared with observed Simulated PSVD compared with observed Integrated system Outputs Intro ViCAs and Vs Integrated model Results Conclusions

10 PC Different hours Intro ViCAs and Vs Integrated model Results Conclusions PSVD DW observation Observed PC outlet 1.6 m/h Observed PC inlet

11 PSVD Simulation vs. observation Maruéjouls et al. (2011) – Water Science & Technology PC Different hours PC inlet PC outlet Intro ViCAs and Vs Integrated model Results Conclusions Observed PC outlet Observed PC inlet 1.6 m/h

Conclusions  Integrated model with particle classes, requiring only few ViCAs experiments  Reproduces the PSVD evolution between RT and PC  Particle transport through urban system is improved  Many processes are simulated under DW and WW conditions: sedimentation, RT cleaning systems, pumping induced resuspension 12 Intro ViCAs and Vs Integrated model Results Conclusions

Thanks Questions Thanks Questions Canada Research Chair on Water Quality Modeling Collaborative Research and Development Grants

14 Integrated system Primary clarifier effluent Intro ViCAs and Vs Integrated model Results Conclusions DW 24 ton Flow rate (10 3. m 3 /h)

15 Integrated system Primary clarifier effluent Intro ViCAs and Vs Integrated model Results Conclusions DW WW DW 24 ton WW without delay 46 ton Flow rate (10 3. m 3 /h) WW with delay 46 ton

16 PSVD masses removal DW vs. WW Intro ViCAs and Vs Integrated model Results Conclusions