Dewatering

stabilizedsolids (high P)

Minimal Pretreatment(grit removal,screens)

InfluentEffluentAnaerobic

MBR

methane

O2

sludge (8-10% P)

stabilized sludge

AnoxicAnaerobic

Two-stage MBR

First stage:convert organics into methane

Objectives: recover more energy from the organics, use less O2 produce less sludge, first stage generates carbon needed for N and P removal, avoid chemicals for disinfection.

Second stage:remove nutrients

membranesmembranes

First stageconverts organics into methane

Second stage removes nutrients

Laboratory setup

Dept. Civil & Environmental Engineering, Stanford University

Chok Hang Joanne YeungSU, PhD student

Daniel YehUniv. S. Florida, Asst Prof

Craig CriddleSU, Assoc. Prof

Bob HickeyEcovation, VP

MBR Project Team

Charles Hardy SU, MS student

(graduated)

Bob BrownSU Exp Lab

Young LeeSU, Postdoc

Philip WongSU, PhD student

George WellsSU, PhD student

Alicia NgSU, undergrad