Transcript The Debris issue

An approach to Debris Management
The CIDCO-YUVA Experiment
CITY & INDUSTRIAL DEVELOPMENT CORPORATION OF MAHARASHTRA
Bricks of clay
 Construction activities in
Mumbai consume huge volume
of bricks daily
 Prime agricultural lands
surrounding the city exploited
 Removal of topsoil leads to
severe soil erosion and
devastates agricultural potential
 Need - Construction solutions
that do not degrade our
ecosystems
Bricks of clay
Brick kilns are typically fed
with fuels such as coal/old
tyres..
Brick kilns contribute greatly to air
pollution where they operate and
produce relatively large emissions
of the greenhouse gases
Substitute for hazardous and air polluting brick making industry
Debris
Construction waste, Renovation waste and demolition waste
The Debris issue
 Mumbai generates 7500 tons of solid waste/day and 30%
is debris (2250 tons/day)
 Increasing land prices and more construction activities are
forcing the demolition of old structures and building new
structures – Creation of more debris
 If the external surface of a building of 20 floors is repaired,
the waste generated would be ~ 200 truckloads
 Renovations/ Repairs – Difficult to monitor
 Only regulation - Area to be cleaned up from all wastes,
after the completion of work
The Debris issue
 Municipal Corp. refuse the entry of debris into dumping
grounds other than required to cover the garbage
 Proper disposal a concern due to lack of space in Mumbai
 Carting over long distances increases transportation costs makes the entire “business” unprofitable
 Clandestine dumping in the creeks - destroying mangroves
(Versova, Gorai, Charkop)
Environmental Degradation
 Due to few viable alternatives, dumping of debris by
roadsides, empty plots, watercourses, etc
 Destruction of valuable mangroves, clogging of drains
 Debris - Breeding ground for rodents, insects, reptiles
 Over time, people start dumping organic waste on top of
debris - Waste disposal problem leads to health hazard
Impact on Navi Mumbai
 Dumping of debris within NMMC jurisdiction without
permission has been rampant
 Debris from the construction sites in Mumbai is being
dumped on Mangroves
 Illegal debris dumping witnessed along the Palm Marg/
MIDC areas
 NMMC constituted six anti-debris
mobile squads
 25 trucks confiscated (Dec.’10)
Electric junction box in Sector 12,
Bonkode surrounded by construction
debris
Debris Recycling
Use of waste that would otherwise be dumped and reduces
the demand for environmentally unsound building materials
CIDCO – YUVA Experiment
 The Youth for Unity and Voluntary Action (YUVA) is a nonprofit NGO that works to protect the fundamental human
rights of all people, particularly the marginalized
 YUVA in collaboration with CIDCO has set-up a CIDCO –
YUVA Building Centre (CYBC) in 1999
 CYBC developed a innovative debris recycling technology
and brought it to the ground by way of a demonstration plant
 CIDCO has provided a 3,500 sq metre plot for the plant at a
nominal lease amount
Location
The Debris Recycling Process
 Debris sourced from construction sites is broken down into
particles, 30-40 millimeters (mm) in diameter
 Particles are then powdered down by a pulverizing machine
 Special screens enable the machine to grind the particles to
desired levels of fineness
 Dust controller sections of machine filter out unwanted
materials viz. wood particles/sundry other organic items
 Cement and water is then added to the pulverized material
to mould it to a brick-like shape
 Moulded bricks are then cured (hardened by repeated
wetting and drying) for 14 days and then sun-dried
The Process
Application
Walls
Application
Gardens
Recycled debris sand is well suited to use as
sub-base for street pavers
Pathways
Plant Basics
 The CYBC can recycle 3 tonnes debris/day
 A recycled concrete block costs Rs 21 as against Rs 28
for a block made from fresh material
 Recycled blocks show above average strength
 It can produce 1,200 hollow concrete blocks or 2000
pavers of various designs and shapes
The Recycled Block Advantage
BRICKS
Produced from fresh rich soil
BLOCK
Produced from recycled debris
Burning of bricks emits toxic gases The process emits no gases
Valuable timber/saw dust/paddy
No burning process
husk is burnt in kilns
Breakages during transportation
Breaking of walls to lay service
lines
Un-uniform brick sizes results in
uneven wall surfaces
Minimal breakage
Cavity for service lines to pass
Machine-cut gives even and
true surfaces
The Clay Brick and Debris issue
Benefits

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Channelized disposal of C & D waste
Reduced disposal to landfill sites and other sites
Lesser Sand and Top-Soil excavation
Application of Hollow Blocks cheaper than clay bricks
Cost of Raw Material is lesser than fresh Sand and
Aggregates
Observations

Two community centers in Rapar, Gujarat, one such centre in
Mumbai have already used the recycled debris

Construction industry remains unconvinced about recycling
technology

Builders insist for CBRI/ Govt. Agency certification

CYBC experience tells that debris delivery is not very efficient
Dumping of debris from Mumbai in Navi Mumbai can be
channelised to ensure continuous availability of feedstock
Observations
 Experiment has potential to cater to location wise requirements
 Mechanism to ensure off-take on regular basis by builders/govt.
agencies
 For the project to be commercially successful there is need to
scale-up, test technology in the market, create more awareness
and demonstrate its utility on a regular basis
 MCGM had extended a call to the international engineering
community to design, construct and manage a 500-ton per day
construction and demolition (C&D) waste recycling facility for the
city. Results awaited
Thank You