~WEHRLE
WEHRLE Umwelt GmbH· Bismarckstr. 1-11 • 79312 Emmendingen • Germany
PT. Adhi Karya (Persero) Tbk.
Jl. Raya Pasar Minggu Street, KM 18
1251 0 Jakarta
lndonesia
Contact person :
Kenan Güney
Department:
Asia & Middle East
Phone:
+49 7641 585-226
Fax:
+49 7641 585-4226
E-Mail:
guney@wehrle-umwelt.com
Internet:
www.wehrle-umwelt.com
Date:
2021-10-25
Dear Adhi Karya Team
Adhi Karya stated with his emails on 2021 -10-12 and 2021-1 0-25 that seed sludge with maximum
8000 mg/1 bacteria concentration can be found locally in lndonesia. Kindly be aware that seed
sludge concentration plays an important role to reach the design sludge (bacteria) concentration
in bioreactor. lf the difference between design sludge concentration and the seed sludge
concentration gets higher, the commissioning duration will be Ionger due to the need to produce
more bacteria to reach the design sludge concentration. Therefore, to shorten commissioning
period, seed sludge should have a concentration close to design sludge concentration.
We approve that we can start commissioning of the plant with a seed sludge concentration with
8000 mg/1. Kindly note that the seed sludge should be
- active (not dead)
- pre-filtrated with 1000 !Jm (maximum 2000 !Jm) pore sized filter
- has no fibrous or coarse material inside.
I would like to inform you that it may be possible to take seed sludge from PT PP ERIC Sidoarjo
leachate treatment plant since this plant will be commissioned soon and will have much higher
(12000mg/l-17000mg/l) sludge concentration. Kindly contact to PT PP accordingly.
i.A. Kenan Güney
Project Manager
Headquarter
Bismarckstraße 1-11
79312 Ernmandingen
Germany
Managing Directors:
Dr.-tng. Bemd Fitzke
Heiner Steinberg
Phone
+49 7641 585-0
Fax
+49 7641 585-106
1vww.wehrle-umwelt.com
info@wehrle-umwelt.com
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