CASE STUDYM U N I C I P A L

Start-up: 2004

Client: Sirdal MunicipalityConsultant: Norconsult AS

ChallengeTo design and operate a treatment plant planned for future expansions and great annual variations in flow and organic load.

SolutionCombining the Kaldnes™ MBBR and Actiflo® technologies in two interchangeable trains made it possible to design the treatment plant with a maximum operational flexibility.

Design capacityQdim: 82 m3/h (average flow)Qdim.max: 164 m3/h (peak hourly

flow)Organic load: 375 kg BOD5/d

Discharge limitsBOD5: 25 mg/L or 70 % (daily flow

proportional composite sample)

COD: 125 mg/L or 75 % (daily flow proportional composite sample)

Tot-P: 90 % (yearly mean)

Background The area of Øvre Sirdal is a rural area, characterized by a small residential population and a great seasonal tourist activity. New hotels and cabins are built, and the municipality expects an intensive growth in the tourist sector in the coming years. In order to meet the challenge from this extensive development, the municipality chose to build a new treatment plant for the whole community.

ConceptA greenfield waste water treatment plant was built. The plant consists of a pumping station for incoming waste water, screening, Kaldnes™ MBBR process, and Actiflo® for sludge separation. Both biological and chemical treatment units are comprised of two interchangeable trains. This gives operational flexibility in handling huge variations in flow and load. Sludge is dewatered in a filter press.

Handeland wwtp Norway

Krüger KaldnesNordre Fokserød 9 • 3241 Sandefjord, Norwayoff. +47 91 60 80 00 - Fax: +47 33 48 50 01 postnorway@krugerkaldnes.nowww.krugerkaldnes.no

Flow diagram

Kaldnes™ MBBR Actiflo®Two trains with reactors in series with measurement of oxygen in each reactor.

HRT (coag.) ~ 1 min

Reactor volume: 130 m3 HRT (inj.) ~ 1 min

Filling degree of biomedie:

45 % (today load)67 % (future load)

HRT (mat.) ~ 3 min

SALR: 11,5 g/m2 d, 10°C (future load)

Surface load (Qmax,dim)

82 m3/h per train

Aeration capacity:

720 Nm3/h Upflow velocity in settling tank

125 m/h at max flow

Design

Treatment results

Treatment

results

2007-2008

Avg.

removal

(%)

Avg. effl.

concentration

(mg/L)

BOD5 89,0 15,6

COD 82,3 62,8

TOT-P 85,3 0,830

TSS 86,7 20,2

CASE STUDY | MUNICIPAL

Handeland wwtp Norway

Results Handeland wwtp 2007-2008BOD5

0

50

100

150

200

250

300

350

Jan-0

7

Feb-07

Mar-07

Apr-07

May-07

Jun-0

7Ju

l-07

Aug-07

Sep-07

Oct-07

Nov-07

Dec-07

Jan-0

8

Feb-08

Mar-08

Apr-08

May-08

Jun-0

8Ju

l-08

Aug-08

Sep-08

Oct-08

Nov-08

Dec-08

Con

cent

ratio

n B

OD

5, m

g/L

Influent concentration

Effluent concentration

Results Handeland wwtp 2007-2008COD

0

100

200

300

400

500

600

700

800

900

Jan-0

7

Feb-07

Mar-07

Apr-07

May-07

Jun-0

7Ju

l-07

Aug-07

Sep-07

Oct-07

Nov-07

Dec-07

Jan-0

8

Feb-08

Mar-08

Apr-08

May-08

Jun-0

8Ju

l-08

Aug-08

Sep-08

Oct-08

Nov-08

Dec-08

Con

cent

ratio

n C

OD

, mg/

L

Influent concentration

Effluent concentration

Results Handeland wwtp 2007-2008Tot-P

0

2

4

6

8

10

12

Jan-0

7

Feb-07

Mar-07

Apr-07

May-07

Jun-0

7Ju

l-07

Aug-07

Sep-07

Oct-07

Nov-07

Dec-07

Jan-0

8

Feb-08

Mar-08

Apr-08

May-08

Jun-0

8Ju

l-08

Aug-08

Sep-08

Oct-08

Nov-08

Dec-08

Con

cent

ratio

n To

t-P, m

g/L

Influent concentration Tot-P

Effluent concentration

Results Handeland wwtp 2007-2008Suspended solids

0

50

100

150

200

250

300

350

400

Jan-0

7

Feb-07

Mar-07

Apr-07

May-07

Jun-0

7Ju

l-07

Aug-07

Sep-07

Oct-07

Nov-07

Dec-07

Jan-0

8

Feb-08

Mar-08

Apr-08

May-08

Jun-0

8Ju

l-08

Aug-08

Sep-08

Oct-08

Nov-08

Dec-08

Con

cent

ratio

n TS

S, m

g/L

Influent concentration TSSEffluent concentration TSS