an approach to debris management the cidco-yuva experiment city & industrial development...
TRANSCRIPT
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An approach to Debris Management
The CIDCO-YUVA Experiment
CITY & INDUSTRIAL DEVELOPMENT CORPORATION OF MAHARASHTRA
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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
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Substitute for hazardous and air polluting brick making industry
Brick kilns contribute greatly to air pollution where they operate and produce relatively large emissions of the greenhouse gases
Bricks of clay
Brick kilns are typically fed with fuels such as coal/old tyres..
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Construction waste, Renovation waste and demolition waste
Debris
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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
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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)
The Debris issue
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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
Environmental Degradation
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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
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Use of waste that would otherwise be dumped and reduces the demand for environmentally unsound building materials
Debris Recycling
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CIDCO – YUVA Experiment
The Youth for Unity and Voluntary Action (YUVA) is a non-profit 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
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Location
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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
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The Process
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Application
Walls
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Application
Pathways
Gardens
Recycled debris sand is well suited to use as sub-base for street pavers
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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
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The Recycled Block Advantage
BRICKS BLOCK
Produced from fresh rich soil Produced from recycled debris
Burning of bricks emits toxic gases
The process emits no gases
Valuable timber/saw dust/paddy husk is burnt in kilns
No burning process
Breakages during transportation Minimal breakage
Breaking of walls to lay service lines
Cavity for service lines to pass
Un-uniform brick sizes results in uneven wall surfaces
Machine-cut gives even and true surfaces
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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
The Clay Brick and Debris issue
Benefits
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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
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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
Observations
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Thank You