5
3. Description
Using
BioMembranTechnologie,
the
Watermanager GWM
treats domestic greywater from baths, showers and basins to pro-
duce high-quality process water for a second purpose as process water.
The separately collected greywater is initially relieved of any insoluble substances contained in it, such as hair, textile fluff, etc.,
using the
Trident
coarse filter. This coarse filter is automatically back-flushed and cleaned periodically. Subsequently, the con-
trol unit ensures all biodegradable substances contained in the water, such as shower gel, shampoo, soap, etc. are broken
down by micro-organisms in the
Watermanager GWM.
To do this, the greywater is to create a consistent oxygen supply for
biodegradable processes. The BMT membrane filter, the heart of the BMT unit, performs the last treatment process. By applying
a low pressure, the water is gently drawn through the filter membranes into the process water storage tank. The permanently
physical barriers of the BMT membrane filter with just a 38 nm pore width guarantees secure separation of particles, sludge,
germs and adsorbed viruses from the greywater: the result is absolutely clear, odour-neutral and germ-free process water. The
cleaned greywater can be stored for a long time and reused with no hygienic hesitations due to the very low nutrient content
(biological cleaning) and virtually undetectable remaining biomass (ultrafiltration). If there is no process water available, the
Watermanager GWM
automatically switches to drinking water operation. If needed, drinking water is automatically feed into the
process water storage tank in accordance with DIN EN 1717 (AB).
All unit processes are micro-electronically monitored by the central control unit and managed in a fully-automated manner.
Faults are shown by a visual or acoustic message and can be sent by SMS or email to a mobile telephone or central control
room via an optional GSM modem (available as an optional accessory). It is also possible to connect a potential-free alarm
contact to a standard connection.
The
process water does not have the quality of drinking water,
but is many times below the hygienic, microbiological re-
quirements of the British Standard 8525-1 for greywater usage, the EU Bathing Water Directive 2006/7/EC (2006) and the
requirements of Irrigation Classification 2 (public parks, school sports facilities) in accordance with DIN 19650 (1999). This high-
quality process water can be used without any hygienic qualms for any purposes in the field of process water usage.
Table 1: Outflow qualities of process water after treatment by Watermanager GWM
Parameter
Outflow quality*
Biological oxygen demand
(BOD
5
)
< 5 mg/L
Chemical oxygen demand
(CSB)
< 30 mg/L
TS (dry solids)
< 1 mg/L
Turbidity
1 NTU
Eschericha coli
0 cfu/100ml
Total coliforms
< 10 cfu/100ml
* greywater feed quality from showers, bath tubs, washbasins as per fbr information sheet H201 (2005) Table 1.
3.1.
Functional description
3.2.
Process water quality
