Welcome European visitors !

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22 Φεβ 2014 (πριν από 3 χρόνια και 3 μήνες)

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Welcome European visitors !

Februari 7, 2013, Site Houthalen Centrum

What are we going to do today?




Who is
Aquafin

?



Energy management



Wastewater treatment plant (WWTP)



Thermal Sludge dryer



Field trip on site



Wastewater treatment in Flanders

Who

is
Aquafin

?



1990 : Established by the Flemish government



1995 : exploitation of the infrastructure



2004 : owner of all WWTP






265 WWTP



1315 pumping stations



5096 km sewer pipeline



1000 employees



2.000.000.000 liters/day


Energy management

Energy
consumption

in
Flanders

0,7% of the
industrial

energyconsumption

in
Flanders

Energy
consumption

Aquafin



Budget : 112
million

EUR

personel

23%

energy

25%

maintenance

11%

sludge

28%

taxes

3%

chemicals

4%

other

6%

Operations (2010)


“Trias
Energetica
” concept

Energy report,

Energy
audit
,

Aeration

energy

Method




-
M
onitoring


-
Simple

performance indicator : kWh/
IE
NkJ

-
Compare

model
with

reality



Awareness

!!!






Model

Influentload

Volumes

Head

(pumps)

Aeration

power

Efficiency

Pumping

power

Mixing

power

Energy
audit

WWTP

11

Via voettekst kan je hier je titel toevoegen © Aquafin NV 2005

OPERA

OD

TOO

O&PO

Energy
-

Management

-
TOP 5 :
audit

by

means

of a
multidisciplinairy

team


Resultaat 2010
-

2011

-

Besparing na uitvoering alle energieprojecten
:


2010




2011


7 miljoen
kWh
e



7,5 miljoen
kWhe



746.500 EUR/jaar


755.000 EUR/jaar
















“Trias
Energetica
” concept

Sludge

digestion

Codigestion

Heatpumps

Sludge

digestion

0
1,000,000
2,000,000
3,000,000
4,000,000
5,000,000
6,000,000
7,000,000
8,000,000
9,000,000
10,000,000
2005
2006
2007
2008
2009
2010
2011
2012
Evolutie meerdere jaren

+40%

Resultaat 2012

-

Besparing door opwekking groene stroom






9.500.000
kWhe



ㄮ㠰㔮〰〠䕕删
⬱㐬㔥)


In 2010: 1 RWZI > 1 miljoen
kWhe

In 2011: 2
RWZI’s
> 1 miljoen
kWhe

In 2012: 5
RWZI’s

> 1miljoen
kWhe

“Trias
Energetica
” concept

Efficient

processes

(
Annamox
, A/B
Verfahren
)

Efficiënt
equipment

(bv.
screwblowers
)

Efficient

dewatering

(bv
bucher
)

Efficient

tools

Incorporate

Energy in
everything

we do :

-


Knowledge

projects

(multidisciplinair !)

-
Propellors
, mixers, et al.

-

Purchasing

pumps, compressors : Energy as important
parameter

-
Total
Cost

of
Ownership

!!!!

-

Experiments

in
tendering

vb. Leuven, Burcht

-
Aim

:
use

the
knowledge

of providers to
think

along

with

us
. To provide
us

with

a
solution

-

Researchprojects

-
Heatpumps

-
Glycerol
dosing


-
Screwcompressor

-

Bucher

press

Total
Cost

of
Ownership

Conclusion

-
Think

Energy !






How

do we do
it

?



Wastewater cycle and sludge cycle



Sludge treatment


How

do we do
it

?



Wastewater cycle and sludge cycle


Stap

1: Mechanical treatment


Stap

2: Biological treatment


Stap

3: Final treatment (separation by sedimentation)


How

do we do
it

?



Sludge treatment


-
Anaerobe sludge digestion

-
(sludge reduction, methane production)

-

Sludge dewatering (up to 35 %DS)

-

(thickener , thickening table, filter
beltpress
, chamber
filterpress
, centrifuge)

-

Drying (thermal sludge dryer) (up to 90 %DS)

-

(Energy production by burning as fuel, major reduction of sludge mass)

Thermal Sludge Dryer

Dryer


To reduce sludge
volume



A consisted and manageable
product



To reduce transportation
cost



Energy value by burning as lower
fuel



Capacity = 10.000 tons/year at 90 %DS (3,7 m3/h
water evaporation)


Or


150 m3/d dewatered sludge transformed into 30
ton of pellets

Why should we dry sludge ?

Digested and active dewatered sludge

Dryer

Air Fan

Sludge drying


The dryer is for 50 % filled up with
pellets



Air fans are started and create an air flow
throughout
the pellets

(max. airflow =

24.000
m3/h
)



The air flow is used to absorb dust and moister
coming out of dewatered sludge, it also forms the
pellets



Air flow is inert to prevent
explosion



Inert gasses are mainly produced during the
process
(extra nitrogen injection during
start up or
when necessary)

Dryer

Steam

Water

Heat

Exchanger

Inside dryer


Steam temperature = 200
°
C


Steam pressure = 12 bar


Water temperature = 100
°
C


Under
-
pressure on top of
dryer



Top temperature is regulated at
85
°
C mainly by controlling the
sludge flow

Heating up the dryer


Steam is used to heat up the
dryer



The steam is produced by a neighbor
factory



Condensed water (100
°
C
) coming out of the heat
exchanger is returned to the steam producer


Cyclone

Dust

Separator

Condenser

Drip

Collector

Dryer

WWTP

Effluent


Fully closed inert air circulation


Remove
dust (drying process)


Remove water out of sludge


Condensation by sprinkling

60
°
C

Steam

Water

Heat

Exchanger

Inside dryer

15
°
C

85
°
C

60
°
C

60
°
C

The condenser

89 m³/day

Sludge
-

Daily based

buffering

Steam

Water

Heat

Exchanger

Inside dryer

Dryer

Sludge

Bunker

(500 m3)


Sludge flow at 150 m3/d


DS = 25
-

30 %

DS = 60 %

Feeding sludge

Steam

Water

Pellet

Silo

Pellet

Cooler

Heat

Exchanger

Inside dryer

Dryer

85
°
C

40
°
C

WWTP

40
°
C


Pellets at 90 % DS


Daily 30 tons of pellets


Silo is kept inert to prevent
explosion

Removing the pellets

180 tons

Steam

Water

Pellet

Silo

Pellet

Cooler

Heat

Exchanger

Inside dryer

Dryer

SLUGE DRYER

Air Fan

Cyclone

Dust

Separator

Condenser

Drip

Collector

WWTP

60
°
C

15
°
C

85
°
C

60
°
C

60
°
C

89 m³/day

Effluent

Sludge
-

Daily based

buffering

Sludge

Bunker

(500 m3)

DS = 60 %

85
°
C

40
°
C

WWTP

40
°
C

180 tons