Page 77 - GRIHA Manual Volume IV - Introduction to National Rating System
P. 77
68 Griha Manual: Volume 4
A sample supporting document (narrative) from a GRIHA compliant building is shown below.
Reuse and recycle of rainwater
A waterbody having an area of about 820 sq m is being constructed at the rear of the building. Three foam geyser nozzles are to be
installed. Water from these nozzles will rise 2–3 m above the water level in the waterbody. The total evaporation losses for the climate
of IIT campus in Kanpur are assumed to be 8 mm/ m of the area of body per day (Khanna Handbook page 17/74) (6 mm from surface
2
and 2 mm due to foam geyser nozzles), which works out about 7000 litres per day. Thus, the water in the waterbody will require
replenishment of 7000 litres of water daily on an average.
In Kanpur, the rainy season is from July to September and annual rainfall is 880 mm. Calculation for run-off available on rainy
days, by month, is attached. It will be seen that on rainy days make up water shall be available from the runoff and will be reused. The
total quantity of runoff water reused works out to be 330 m3.
Drawing showing the pipe system for collection of rainwater from roof and paved area of the buildings and so on is enclosed.
Before the water is led to the waterbody, a desilting chamber is also provided (Drg. No. PL-001). Each catch basin will have a rough
grating on top to prevent entry of loating and bigger size of materials into the piping system. Normally, the water in the waterbody will
be recouped from the normal water supply/tube wells supply to the building.
Reuse of treated wastewater
The packaged common sewage treatment plant of 50 m /day capacity is proposed to treat the wastewater generated from different
3
buildings in the campus including the environmental sciences and engineering building. The amount of wastewater from this building
is equivalent to 8.5 m / day. The treatment system is based on the INDION New Generation Packaged Sewage Treatment Plant
3
(NGPSTP) of Ion Exchange India Ltd. It is a unique combination of lamella plate clariication and aeration that results in a ready-to-
operate, pre-fabricated solution. The process includes primary settlement wherein the suspended solids are reduced to an extent
of 75% through the use of lamella parallel plates. There is also a reduction in BOD by 25%. The wastewater then enters the aerator
bio-zone, which is a combined ixed ilm reactor and active aeration system mounted on a horizontal shaft. The aerobic biodegradation
of the organic matter present in the wastewater occurs in this zone. The aerator provides a solid surface area for micro-organisms and
the aeration is facilitated by the rotation of the drum. The treated water then moves to the settlement area where the settlement of iner
particles occurs through the use of lamellar plate assembly. The sludge is removed at regular interval, which is then used as fertilizer.
A sample supporting document (narrative) from a GRIHA compliant building is shown below.
Reuse and recycle of rainwater
A waterbody having an area of about 820 sq m is being constructed at the rear of the building. Three foam geyser nozzles are to be
installed. Water from these nozzles will rise 2–3 m above the water level in the waterbody. The total evaporation losses for the climate
of IIT campus in Kanpur are assumed to be 8 mm/ m of the area of body per day (Khanna Handbook page 17/74) (6 mm from surface
2
and 2 mm due to foam geyser nozzles), which works out about 7000 litres per day. Thus, the water in the waterbody will require
replenishment of 7000 litres of water daily on an average.
In Kanpur, the rainy season is from July to September and annual rainfall is 880 mm. Calculation for run-off available on rainy
days, by month, is attached. It will be seen that on rainy days make up water shall be available from the runoff and will be reused. The
total quantity of runoff water reused works out to be 330 m3.
Drawing showing the pipe system for collection of rainwater from roof and paved area of the buildings and so on is enclosed.
Before the water is led to the waterbody, a desilting chamber is also provided (Drg. No. PL-001). Each catch basin will have a rough
grating on top to prevent entry of loating and bigger size of materials into the piping system. Normally, the water in the waterbody will
be recouped from the normal water supply/tube wells supply to the building.
Reuse of treated wastewater
The packaged common sewage treatment plant of 50 m /day capacity is proposed to treat the wastewater generated from different
3
buildings in the campus including the environmental sciences and engineering building. The amount of wastewater from this building
is equivalent to 8.5 m / day. The treatment system is based on the INDION New Generation Packaged Sewage Treatment Plant
3
(NGPSTP) of Ion Exchange India Ltd. It is a unique combination of lamella plate clariication and aeration that results in a ready-to-
operate, pre-fabricated solution. The process includes primary settlement wherein the suspended solids are reduced to an extent
of 75% through the use of lamella parallel plates. There is also a reduction in BOD by 25%. The wastewater then enters the aerator
bio-zone, which is a combined ixed ilm reactor and active aeration system mounted on a horizontal shaft. The aerobic biodegradation
of the organic matter present in the wastewater occurs in this zone. The aerator provides a solid surface area for micro-organisms and
the aeration is facilitated by the rotation of the drum. The treated water then moves to the settlement area where the settlement of iner
particles occurs through the use of lamellar plate assembly. The sludge is removed at regular interval, which is then used as fertilizer.
