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

The following operating delineation of the SANIRESCH plant and the technical description
is based on instruction manual (HUBER SE, 2011a) and HUBER greywater treatment
description (HUBER SE, 2011b):
To outline the function of the plant, the three main components are explained. These include
the intermediate storage tank (1.), the MBR-tank (2.) and the storage tank (3.), as shown
in Figure 9. The plastic tanks are custom-made from polyethylene (PE) and hermetically
sealed to avoid odour nuisance. For pressure equalisation the whole system with all
containers is connected to an external ventilation system. All connecting pipes between the
tanks are provided with sampling taps. All three containers (intermediate storage tank,
membrane bio reactor and permeate storage tank) have an overflow for emergency
situations, which leads into the collecting pipe that runs into the conventional sewer system.
An additional component is the electric measuring and automatic control devices which
include a remote data transmission and fault indication function via SMS and telecontrol.
Figure 9: Flow chart of greywater treatment plant; (HUBER SE, 2011b)
1. Intermediate storage tank:
The intermediate storage tank works as a hydraulic buffer for the alternate inflow of
greywater before it is pumped into the MBR tank for treatment. On the top of the tank in the
area where the inlet is positioned, there is a fine mesh screening (3 mm) fixed to retain
debris such as hairs and disturbing material. The cone shaped filtration unit is called HUBER
TURNY and is visible in Figure 10. By the force of running-in greywater the sieve turns and a
blockage of mesh can be avoided thereby. 99% of the greywater yield can be provided in this
way. There is an automatic backwashing process installed where the scouring device cleans
the screen by jets of purified greywater once a day for 10 seconds. The contraries are
drained through the outflow into the conventional sewer system.
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