BIOME, WIPRO, MAPSAS and other lakes communities have come
together to try and understand how bio-remediation technologies can be applied
to deal with the sewage inflow into some of the rejuvenated/to be rejuvenated
lakes around Sarjapura Road.
together to try and understand how bio-remediation technologies can be applied
to deal with the sewage inflow into some of the rejuvenated/to be rejuvenated
lakes around Sarjapura Road.
Hence on 25th November the
first meeting was arranged to discuss bioremediation methods, to bring together
the community working on different lakes in Bangalore on a same platform and
decide on the further agenda for 15 lakes selected for the project was the
objective of the meeting.
first meeting was arranged to discuss bioremediation methods, to bring together
the community working on different lakes in Bangalore on a same platform and
decide on the further agenda for 15 lakes selected for the project was the
objective of the meeting.
Following are the key
points/deliberations happened during the meeting:
points/deliberations happened during the meeting:
A.
The
lakes that have been narrowed down for this project are:
The
lakes that have been narrowed down for this project are:
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|
B.
An
initial discussion was led by Priya from MAPSAS who explained about the links
between the lakes through kaluves and
hence the importance of controlling the sewage entering in the lakes.
An
initial discussion was led by Priya from MAPSAS who explained about the links
between the lakes through kaluves and
hence the importance of controlling the sewage entering in the lakes.
C.
Mr.
Vishwanath explained about viewing lakes as an ecosystem with space for
biodiversity, treatment, recharge zones, etc. He cited example of Jakkur lake
wherein a treated sewage water from BBMP maintained STP goes into a constructed
wetland and then into the lake. He suggested that things that can be studied
for lake should include percolation study, water balance, nitrate and phosphate
removal, biodiversity, etc.
Mr.
Vishwanath explained about viewing lakes as an ecosystem with space for
biodiversity, treatment, recharge zones, etc. He cited example of Jakkur lake
wherein a treated sewage water from BBMP maintained STP goes into a constructed
wetland and then into the lake. He suggested that things that can be studied
for lake should include percolation study, water balance, nitrate and phosphate
removal, biodiversity, etc.
D.
Some
legal issues were also discussed:
Some
legal issues were also discussed:
- Areas without BWSSB underground
drainage network are not allowed to dispose of their sewage either with or
without treatment. Zero discharge i.e. 100% reuse of wastewater generated
within the premises - Areas with BWSSB underground
drainage network are allowed to dispose of their sewage with at least
secondary treatment - The discharge standards for sewage
treated water are close to drinking water standards
E.
An
important part of the meeting was presentations by vendors implementing
bio-remediation technologies. Presentations were made by Visionearthcare on
soil biotechnology (SBT), Hydrocreatives on Phytorid, and CDD on Decentralized
wastewater treatment system (DEWATS).
An
important part of the meeting was presentations by vendors implementing
bio-remediation technologies. Presentations were made by Visionearthcare on
soil biotechnology (SBT), Hydrocreatives on Phytorid, and CDD on Decentralized
wastewater treatment system (DEWATS).
Soil biotechnology (SBT): Have done for Herohalli Lake in
Bangalore.
Bangalore.
Their detailed
presentation can be found http://www.slideshare.net/biomeshubha/sbt-for-lakes-bioremediation
presentation can be found http://www.slideshare.net/biomeshubha/sbt-for-lakes-bioremediation
a. No external aeration is required as the
different porous layers in the medium/bed help in aeration.
different porous layers in the medium/bed help in aeration.
b. One time media installation. No need to
change soil media frequently
change soil media frequently
c. No sludge formation
d. Space: 1 sq.m/KLD
e. No foul odor
f. Have established 65 plants across
India. Also experience in designing for lakes
India. Also experience in designing for lakes
g. Not designed for removal of nitrates
and phosphates specifically yet it works in their removal
and phosphates specifically yet it works in their removal
h. Herohalli plant details: Design
capacity-1.4 MLD, Area- 1650 sq. m, cost- 3 crores, power consumption-125
units/day
capacity-1.4 MLD, Area- 1650 sq. m, cost- 3 crores, power consumption-125
units/day
Phytorid technology
Their detailed
presentation can be found here: http://www.slideshare.net/biomeshubha/phytorid-for-bioremediation-of-lakes
presentation can be found here: http://www.slideshare.net/biomeshubha/phytorid-for-bioremediation-of-lakes
a. Plants have been designed particularly
for BOD reduction and some amount of COD reduction also happens
for BOD reduction and some amount of COD reduction also happens
b. Power Cost: Rs. 1/KL
c. Sedimentation tank: needs to be cleaned
once in a year
once in a year
d. Issues with phytorid bed: Plants grow
over a period and hence need to be cut as suited by the community. The disposal
of cut plants is similar to other plants.
over a period and hence need to be cut as suited by the community. The disposal
of cut plants is similar to other plants.
e. No foul odor as water is not seen from
above, no exposure
above, no exposure
f. Bacterial addition: once in a lifetime
of the plant
of the plant
g. Space: for sedimentation
tank/underground primary settling tank- 0.2/0.3 sq.m/KL and for phytorid bed-
0.9 sq.m/kl
tank/underground primary settling tank- 0.2/0.3 sq.m/KL and for phytorid bed-
0.9 sq.m/kl
h. Cost per MLD: 1.3 crores
i. Sensor based system
j. Capacity range: 3 KLD -1.5 MLD
k. The system needs to be placed in open
as it needs sunlight for the plants to grow
as it needs sunlight for the plants to grow
l. Water load fluctuation: the plants can
survive without water (especially this may happen in dry season) for two
months. Even if little amount of water is available, the plants can survive on fewer
nutrients.
survive without water (especially this may happen in dry season) for two
months. Even if little amount of water is available, the plants can survive on fewer
nutrients.
m. If slope/gradient is available then no
pumping is required
pumping is required
Decentralized wastewater treatment system (DEWATS):
Their detailed
presentation is available here: http://www.slideshare.net/biomeshubha/how-dewats-can-be-implemented-to-bioremediate-lakes
presentation is available here: http://www.slideshare.net/biomeshubha/how-dewats-can-be-implemented-to-bioremediate-lakes
a. Shared case study of Bandhwa Talab in
Raipur, Chattisgarh.
Raipur, Chattisgarh.
b. This system based on phytotechnology
which uses Canna indica plant which has shallow fibrous root system
which uses Canna indica plant which has shallow fibrous root system
c. No color, odor and pathogens after
passing the water through the bed of plant
passing the water through the bed of plant
d. Based on requirement design can be
customized
customized
e. The flow should be checked daily,
sludge removal from the settling tank (primary treatment) is also required
sludge removal from the settling tank (primary treatment) is also required
f. Treats only organic waste, domestic
sewage
sewage
g. Cost varies with capacity
F.
Further
deliberations and studies are needed on:
Further
deliberations and studies are needed on:
1. Assuming that some amount of sewage
already exists within the lakes, which of the systems would be useful?
already exists within the lakes, which of the systems would be useful?
2. It is essential to conduct water
balance study for every lake. Water balance means, calculating percentage of
water coming, sewage coming, water percolating, evaporation, etc.
balance study for every lake. Water balance means, calculating percentage of
water coming, sewage coming, water percolating, evaporation, etc.
3. Understanding the suitability of the
system based on cost, maintenance, power consumption and mostly its ability to
handle water load fluctuation, etc.
system based on cost, maintenance, power consumption and mostly its ability to
handle water load fluctuation, etc.
Based on primary data collection from
each of the implemented technologies, water balance for some of the lakes and
finally deliberations on bio-remediation technologies would help in seeking
most suitable method to tackle the issue at hand.
each of the implemented technologies, water balance for some of the lakes and
finally deliberations on bio-remediation technologies would help in seeking
most suitable method to tackle the issue at hand.
We would like to thank the
participants:
participants:
Vendors: Sharan Kumar from Visionearthcare for
SBT, Mr. Himanshu from Hydrocreatives for Phytorid, Mr. Andrew Jacobs from CDD for
DEWATS
SBT, Mr. Himanshu from Hydrocreatives for Phytorid, Mr. Andrew Jacobs from CDD for
DEWATS
Devarabisanahalli lake/Adarsh residents
Halanayakanahalli lake group
Priya representing MAPSAS
WIPRO
Students from Christ University
This meeting on bio-remediation technologies was very important. BIOME, WIPRO, MAPSAS and other communities in the meeting rooms took great initiative. I think Soil biotechnology will be the best solution to all these issues.
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