D e s i g n a n d V e r i f i c a t i o n
103
The Fig.6 shows the design of wastewater in
Hoi-an Cafe
. The existing effluent
processing in Hoi-an consists of only sedimentation tank.
On the other hand, in
Hoi-an
Cafe
, the water treatment system consists of two sedimentation tanks, two contact
aeration tanks and
a settling tank—e.g. (Fig.7). This handcrafted water treatment tank
was made by local materials and local craftsmen. Moreover, the purified water from the
water treatment tank flows into
Bio-geo-filters
. The
Bio-geo-filters
consist of a serpentine
channel —e.g. (Picture
on the upper left corner of
Fig.6).
The Bio-geo-filters
remove
Phosphorus etc
. from the water. Finally, the water flows into the river in front of
Hoi-an
Cafe
.
Figure 6: Design of effluent processing
Figure 7: Plan of the water treatment tank
Meandering runnel in
Bio-geo-filter
Parking
2F-Cafe
3F-Cafe
Owner’s
Room
Kitchen
Staff
Room
Roof Terrace
BGF1
BGF2
Pond
River
Stairwell
* BGF: Bio Geo Filter
Watertreatment
tank
Serpentine channel of Bio-Geo-Filter
Model of Water treatment tank
From
miscellaneous
drainage
Sedimentation
StorageTank 1
Sedimentation
StorageTank 2
Contact
Aeration
Tank1
Contact
Aeration
Tank2
Settling tank
Pump
tank
To BGF
sludge return pipe
aeration
