Transcript Slide 1

The Challenge
• Conventional Sewage requires 135
LPCD water supply. Most parts of
India water availability is 50-80 LPCD.
• Installation of Toilets and Piped
Water Supply means increased
Wastewater generation.
• Organically growing habitations,
narrow lanes, make installation of
conventional sewage a big challenge.
• Results: Open Drains, Septic Tanks,
Soak Pits and choked sewer
networks. Polluted water bodies and
groundwater contamination.
| Sanitation Reinvented
ClearDigest™
Smart digester that removes solids at the
source and performs primary and partial
secondary treatment.
SBS® ClearConvey™
Network of flexible small bore pipes
designed to move liquids to a centralized
treatment plant.
ClearRecover™
Optimized treatment solution based on
steady flow and predictable quality of
effluent, and tailored to local needs.
Advantages:
1.
2.
3.
Economy of Solution:
• Cost Effective in terms of Financials as well as Installation
time.
• Significantly lower O&M costs.
Sustainability and Durability of Solution:
• Minimizes maintenance requirements of network and
STP.
Usability and adaptability in Rural areas:
• Eliminates groundwater and water body contamination.
• Allows reuse of treated water helping extend availability
of freshwater resources.
Advantages:
4.
Environmental Aspects:
• No additional Chemicals or Bacteria required.
• Natural Process
• Minimizes use of Electricity
5.
Technical aspects and feasibility of Solution:
• Works in Low LPCD Water Supply areas.
• Works in Variable Water Supply areas such as:
 Phased Development Construction
 Developments used as Second Homes.
Applying Canadian innovation to a Worldwide issue
 Ministry of the Environment (Ontario)
New Environmental Technology Evaluation
Program (NETE)
 World Bank (UN Development Program)
“The design of Small Bore Sewer systems”
(Interregional Project INT/81/047)
 US Environmental Protection Agency
Alternative Wastewater Collection Systems
Manual EPA/625/1-91/024 – October 1991
 India: CPHEEO Manual Chapter 8
Decentralized Sewerage Systems: SBS
The World Bank
SBS™ system : A proven & certified process
•
Result of 15 years of experience
with commercially installed
Clearford tanks.
•
Removes solids at the source—key
to enabling Clearford One™.
•
Raw sewage enters via patented
Clearford Hydraulic Mixer which
enhances decomposition without
input energy.
•
Empirical evidence collected in
real operations shows that
pumping out is only required after
decades of normal use.
Smart Digester™
The SBS™ Smart Digester
Length
Width
Bangalore R&D Installation
Location: Hiranandani Villas Project,
Devanahalli, Bangalore
Type of Installation: Labour Camp
Population: 100 people / Tank
Water Supply: Average 10-20 LPCD
Tanks: 4000 L Pre-Cast Concrete
Sewage: Mixed Black & Gray Water
Source: Toilet & Bath Stalls
Load on tank: 50 times greater than design
load of 10 people at 135 LPCD.
Bangalore R&D Installation: BOD Reduction Values
Biochemical Oxygen Demand Entering and Exiting a Clearford Tank
2014
Concentration (mg/L)
2000
1500
Clearford tank, Influent
1000
Clearford tank, Effluent
500
0
Jan-24 Jan-31 Feb-07 Feb-14 Feb-21 Feb-28 Mar-07 Mar-14 Mar-21 Mar-28 Apr-04 Apr-11 Apr-18 Apr-25 May-02
Biochemical Oxygen Demand Removal Efficiency for a Clearford Tank
100
2014
% BOD Removal
80
60
40
20
0
Jan-24 Jan-31 Feb-07 Feb-14 Feb-21 Feb-28 Mar-07 Mar-14 Mar-21 Mar-28 Apr-04 Apr-11 Apr-18 Apr-25 May-02
Clearford tank
Bangalore R&D Installation: TSS Reduction Values
Total Suspended Solids Entering and Exiting a Clearford Tank
2014
1800
Concentration (mg/L)
1600
1400
1200
1000
Clearford tank, Influent
800
Clearford tank, Effluent
600
400
200
0
Jan-24 Jan-31 Feb-07 Feb-14 Feb-21 Feb-28 Mar-07Mar-14Mar-21Mar-28 Apr-04 Apr-11 Apr-18 Apr-25 May-02
Total Suspended Solids Removal Efficiency for a Clearford Tank
2014
100
% TSS Removal
80
60
Clearford tank
40
20
0
Jan-24
Feb-03
Feb-13
Feb-23
Mar-05
Mar-15
Mar-25
Apr-04
Apr-14
Apr-24
Bangalore R&D Installation: COD Reduction Values
Summary
 4 to 90 m3 incremental capacity range, local fabrication of tank.
(Pre-cast, In-Situ construction or Plastic/FRP Tanks)
 Proprietary tank Mixers and Flow Attenuators.

Optimum digestion
 Sealed Inlet and Outlet.
 No Chemical or Bacteria added.
 Hydraulic mixing using inflow.
 Designed to attenuate Peak Flows.
System Comparison
Parameter
Conventional sewer
Large, rigid, RCC and/or
PVC
Smaller diameter,
flexible HDPE
Large specialized
trenching
Simple cut-and-cover or
horizontal drilling
0.5% - 2.0%
0.11% - 0.15%
Every 925 meters
Every 3,000 meters
3-6x
<2x
Inflow of 90 LPCD
None
Sized to handle sludge,
solids and unwanted
infiltration
Sized to handle a
significantly cleaner
effluent.
Inspection
2-3 years
7-10 years
Maintenance cycle
2-3years
35 years
Type of pipes
Pipe installation
Minimum slope of pipes
Average number of
pumping stations*
Peak Flows
Ground water infiltration
Treatment plant size
____________________________________________________________________
*
Depending on the topography
Advantages
 Shallower Trenches.
 Faster and Easier to Install.
 Fewer sewage lift stations.
 Sealed HDPE Pipes.
 Manholes replaced by SAP’s at
80-150m intervals.
System Access Points
Riser
cap
Slope surface
away from
structure
Compacted
granular
backfill
Frame &
cover
Valve box
housing
SAP
riser
45°
elbow
Pipe bedding
& cover
Native
undisturbed soil
SBS sanitary
main
Vertical extensions of the system for maintenance access & air flow
No scheduled maintenance of the pipe network and HDPE main sewer for the life of the system
Routine maintenance for lift stations (only installed when hydraulic gradient dictates)
Located at 100-m spacing & at critical intersections along the sewer routing
Housing of high-grade, durable HDPE ribbed culvert material with a secured CI bolt-on lid
Cayundá, Colombia: common trench installation of water, wastewater & recycling pipe networks
No Minimum Water
- Operates with any level of water from sewage source.
Easy Installation
- Installed with cut-and-cover using local labor and/or horizontal
drilling.
Common Trench
- Other services can be installed in tandem within common
trench.
Low Maintenance
- Inexpensive maintenance.
Efficient Operation
- Less frequent and onerous pumping.
Advantages
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Cleaner sewage entering STP
Lower Operation & Maintenance Costs
Lower power consumption
Reduced Peak Flows
Reduced Sludge Handling
Smaller Plant Footprint
Lower Land Acquisition Costs
May allow use of Structured Wetlands for treatment.
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