15 years experience with membrane bioreactors in germany · 15 years experience with membrane...

15 Years Experience with Membrane

Bioreactors in Germany

Prof. Dr.-Ing. Wolfgang Firk

CEO Eifel-Rur Water Board

Düren, Germany

IWaTec Winter school „Sustainable Use of

Resources: Water and Energy for Egypt“

TU Berlin Campus El Gouna,

22.02. – 01.03.2015

screen grit

chamber

aeration tank

secondary

sedimentation

tank filtration

screen grit

chamber

aeration tank /

membrane unit

Comparison of conventional

wastewater treatment with

membrane bioreactor technology

Comparison microorganisms –

membrane pore size

E. coli ~ 0.5 – 1.5 µm

B.

subtilis

~ 0.3 µm

pore size ~ 0.04 µm pore size ~ 0.2 µm

ultrafiltration microfiltration

membrane

ZENON membrane module

(submerged)

top header

permeate

collecting

pipe

capillary

hollow

fibre

membrane

back

wash

permeate

air

frame

bottom

header

air injection

6

Backwashing

8

Cleaning

Roedingen WWTP: process scheme

S GC DN N MF

Fe RS ES

RC

sedimentation

tank

sludge

tank

new plant old plant

atcivated

sludge

tank

Rödingen wastewater treatment plant

(general plan)

atcivated

sludge

tank

Rödingen membrane

bioreactor (3,000 PE)

Erftverband, 1999

Roedingen WWTP (specifications)

Population equivalents (PE) : 3,000 PE

Annual volume of wastewater (Qa) : 300,000 m³/yr

Daily volume of wastewater (Qd) : 450 m³/d

Dry weather flow (Qt) : 56 m³/h

Combined water flow (Qm) : 135 m³/h

Mechanical treatment

Screen : 3 mm

Aerated grit chamber (V) : 19 m³

Biological treatment

Nitrification tank (VN) : 200 m³

Denitrification tank (VDN) : 200 m³

Membrane filtration

Total membrane surface (A) : 4,416 m²

20

WWTP Rödingen

Electricity Meters

S GC

FD ES

RC

Main meters

Electricity measaring points

Pumps, Blowers

Roedingen WWTP:

energy consumption

0.59

0.35

0.86

0.23

Mechanical

treatment

Biological

treatment

Filtration

Residual

consumption

kWh/m3

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0.0

Energy consumption

membrane filtration

0.5

0.16

0.02

0.18

kWh/m3

Filtration

aeration

Activated

sludge return

Effluent

pump

Residual

consumption

1.0

0.5

0.4

0.3

0.2

0.1

0.0

MLSS = 22g/l

24

Clogged Membranes

at MLSS= 22 g/l

Bottom header (detail)

Black colored sludge

Poor streaming of air

Roedingen WWTP: process scheme

S GC DN/N SAS MF

RC Fe AS

DN/N

l/(m2 x h x bar) °C P

erm

ea

bili

ty

Tem

pera

ture

1999 2000 2001

Membrane

replacement

Operation time

inte

nsiv

e c

lea

nin

g

inte

nsiv

e c

lea

nin

g

0

100

200

300

400

500

600

700

800

0

5

10

15

20

25

30

Permeability

Temperature

Operational problems of existing

capillary modules

PURON membrane system:

an innovative module concept

made in Germany

Module concept

membrane

fixation

Pilot plant at Simmerath (750 PE)

WVER pilot plant at Simmerath

First operating scale PURON

modules at Simmerath

Membrane tank with

observation holes

43

VV

S GC FS AST MF

Kaarst bioreactor (80,000 PE):

process scheme

MLSS = 12 g/l

screen grit

chamber fine

screen

membrane

bioreactor permeate

ES

RC

thickener

sludge

dewatering

fine screening to prevent clogging

Mesh diameter ~ 0.5 mm

Reduction of footprint with membrane

technology at Kaarst WWTP

47

Kaarst WWTP (80,000 PE)

Kaarst WWTP (80,000 PE)

Grit chamber

Fine screen drum

52

Control center

Woffelsbach WWTP

KUBOTA - double-deck K300 module

Woffelsbach WWTP:

membrane plate modules

Woffelsbach WWTP (7,000 PE)

MLSS 12 g/l

Membrane activated sludge

process (dimensioning)

Screen (100% redundancy) 3.0 mm

Fine screen (100% redundancy) 0.5 mm

MLSS 12 g/l

Oyxgen transfer factor alpha factor = 0.6

Energy consumption app. 1.0 kwh / m³

Membrane filter velocity 20 l/(m² x h)

wastewater

temperature of 5°C

Thank

you

for

your

attention

15 years experience with membrane bioreactors in germany · 15 years experience with membrane...

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