An innovative greywater treatment system for urban areas ... - SuSanA

Compared settings SANIRESCH project in
Eschborn
Sampling Weekly:
• General control of plant
operation
• Visual inspection of scouring
air bubbles (regularity)
• control of transmembrane
pressure and documentation
(by control system)
• Visual inspection of
contamination of the permeate
(sampling tap)
• check of operating parameters
and comparison with reference
values of commissioning
• Control of air flow of scouring
and aeration blowers
• Keep of checklist
Removal of excess sludge
and further steps
Every 4 weeks manually;
discharge into conventional
sewer system
Additional equipment Sampling taps, aeration of
intermediate storage tank,
remote data control, remote
control of treatment plant
* It presents the process water demand of the hotel
4-star hotel in Berlin
-
Automatically possible;
discharge into conventional
sewer system or production of
biogas
The energy consumption of the SANIRESCH system was calculated by HUBER SE to be
2.38 kWh/m 3 of treated greywater in normal mode (see appendix 0). In this summary the
aeration of the intermediate storage tank is not included, because it is not an essential task
and in a serial plant the device would not be assembled. In addition, the power requirement
of the remote control and data remote transmission was not taken into account since the
amount is marginal (Winker M. , 2011a).
As shown in the brief overview the maximum treatment capacity of the SANIRESCH plant
is low, but in comparison the energy consumption is very high. The reason is, the difference
of energy demand of aeration blowers, scouring air and a permeate pump differ only slightly
if it is a small or a big plant. The main difference in energy consumption is the pressure rise
with approximately 25 % supplemental (compare with 6.3).
The reuse of greywater within the research project is with 60 l/d (Feicht M. , 2011a) for the
cleaning of preceding screen in the plant very low. In the GIZ building there is no tube and
pressure rise system installed to use the purified greywater for example as process water for
toilet flushing. The reason why recycled water finds no application in the building is an
installed groundwater pumping system which supplies toilet flushing. Because of a high
groundwater table in under the structure it is necessary to lower the level continuously in
order to make the basement car park accessible. Hence, greywater recycling was not a costeffective
option and the main part of purified water is drained into the sewer system leading
to the central wastewater treatment plant located in Frankfurt-Niederrad. Thus, within the
research project the ambition of the SANIRESCH pilot plant is focused to prove the function
of greywater treatment via MBR technology within an office building (Winker & Saadoun,
2011).
Moreover, in a hotel building the accumulating volume of greywater is much higher than in
an office building. The hand washing water contributes the main amount in an office building,
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