COLOGNE, Germany, October 10 /PRNewswire/ -- Activated lignite (HOK)
from the Rhineland is being used to ensure clean drinking water in the Ruhr
region, where RWW Rheinisch-Westfalische Wasserwerksgesellschaft mbH
operates six waterworks that process some 70 million cubic meters of
surface water per year to make high-quality drinking water.
RWW deploys a specially treated activated carbon developed and supplied
by Rheinkalk Akdolit GmbH & Co. KG under the name "Hydro-Anthrasit H". The
company's range covers products for water and waste water treatment, which
are marketed world-wide.
HOK has been used ever since the late 1970s in the "Mulheim process", a
river water treatment technology developed by RWW. In this process, the
customary treatment steps of flocculation, sedimentation, ozoning and
filtration of river water are supplemented by further chemico-biological
processes. HOK has established itself in this technology as a highly
efficient filtration medium with a catalyst function.
The "Mulheim process" uses HOK as a high-quality filter material
In the Mulheim process, the treated HOK performs various functions.
Besides the actual filtration, it eliminates substances on the grain
surface such as iron and manganese which have oxidized after ozone
treatment as well as the ozone itself, which is introduced for disinfection
and oxidation. In addition, the highly porous activated carbon-in
conjunction with the underlying sand layers-allows the settlement of
micro-organisms that is desired for subsequent biological cleaning.
"Owing to its special characteristics, HOK is excellently suited for
use in multi-layer filters and as a basis for biological fixed-bed
filters", explains Volker Niechciol, head of the Waterworks engineering and
operations department at RWW. "One particular reason for using
Hydro-Anthrasit H is its porous surface, which helps achieve very good
results in deferrization, manganese removal and ozone elimination."
HOK: an attractively priced adsorbent for environmental protection
Rheinkalk Akdolit purchases the HOK required for the production of
their activated carbon filters from Rheinbraun Brennstoff GmbH, the member
of the RWE Group responsible for the global marketing of upgraded lignite
products. HOK is produced on a raw lignite basis in the rotary hearth
furnace and used as adsorbent and filtering material in waste gas cleaning
and waste water purification. With an annual capacity of 200,000 tons, RWE
AG is the world's largest producer of activated lignite.
Further information is available on the Internet at http://www.hok.de,
http://www.rww.de and http://www.akdolit.de.
Rheinbraun Brennstoff GmbH
Senior manager, Waste Gas and Water Cleaning
SOURCE Rheinbraun Brennstoff GmbH