solid waste management
TRANSCRIPT
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Solid Waste Management
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Thought of the Day
Cleanliness is Half of Faith…
Hazrat Muhammad (P.B.U.H)
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Waste
• Non-liquid, non-soluble materials rangingfrom municipal garbage to industrial wastesthat contain complex and sometimeshazardous substances.
• Solid wastes also include sewage sludge,agricultural refuse, demolition wastes, andmining residues.
• Technically, solid waste also refers to liquidsand gases in containers
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Flow of Materials and Waste in Industrial Society
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Sources
• Residential • Commercial • Institutional• Industrial (non process
wastes)• Municipal Solid Waste
(Construction and Demolition)
• Municipal Services (excluding treatment facilities)
• Treatment Facilities• Industrial• Agricultural
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Functional Elements of SWM System
• Waste generation
• Waste handling and separation, storage, and processing at the source
• Collection
• Transfer and transport
• Separation, processing, and transformation of solid waste
• Disposal
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INTEGRATED WASTE MANAGEMENT
• Source Reduction
• Recycling and Composting
• Combustion (Waste-to-Energy)
• Landfills
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Management Options IWM
(a) Interactive (b) hierarchical
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IMPLEMENTING INTEGRATED WASTE MANAGEMENT STRATEGIES
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TYPICAL COSTS FOR MAJOR WASTE MANAGEMENT OPTIONS
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TYPICAL COSTS FOR MAJOR WASTE MANAGEMENT OPTIONS
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Capital Costs
• Collection• Materials Recovery Facilities
(MRFs)• Composting• Refuse-Derived Fuel (RDF)
Facilities• Landfilling• Operation And
Maintenance (O&M) Costs• Collection O&M Costs• MRF O&M Costs• Composting O&M Costs
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Regulations
• Floodplains
• Endangered Species
• Surface Water
• Groundwater
• Disease Vectors
• Air
• Safety
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Planning
1. Geologic, hydrologic, and climatic circumstances, and the protection of ground and surface waters2. Collection, storage, processing, and disposal methods3. Methods for closing dumps4. Transportation5. Profile of industries6. Waste composition and quantity7. Political, economic, organizational, financial, and management issues8. Regulatory powers9. Types of waste management systems10. Markets for recovered materials and energy
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Materials Generated in Municipal Solid Waste
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Materials Generated in Municipal Solid Waste
1960-2005
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Recovery for Recycling and Composting
• Materials Recovery
• Durable Goods Recovery
• Nondurable Goods Recovery
• Containers and Packaging Recovery
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Management of Municipal Solid Waste1960-2005
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Source Reduction Terms
• Waste
• Source reduction (also known as waste prevention) or reuse of materials
• Waste reduction and minimization
• Reuse and refurbishing
• Light weighting packaging
• Source expansion (opposite)
• Functional product groupings
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EFFECTS OF SOURCE REDUCTION
Economic
• Reduced pollution from trucks and disposal
• Less resource depletion from excess packaging not generated
• Economic development of area’s reuse and repair industries
• Reduced need for landfill capacity
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EFFECTS OF SOURCE REDUCTION
Environmental• Choice of and extraction of raw materials• Transport and processing of those materials• Manufacture of products from those materials• Use of those products• Fate at end of life (life-cycle assessment)
Waste Composition• As consumption changes, quantity and
composition of solid waste generated changes
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Light Weighting
• The process of reducing the amount of aparticular material per unit of product isknown as light weighting
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State Involvement
• Assistance• Bans and Restrictions• Deposit and Refund Systems• Exchange, Donation, and Sale• Taxes• Reuse/Repair Industries• Consumer and Student Education• Unit Pricing for Waste Reduction - Can systems, Bag
systems, Weight-based systems• Waste Audits and Source Reduction Plans• Yard Waste Programs
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DEVELOPING A SOURCE REDUCTION PLAN- Four Steps
1. Establish an overall source reduction goal that is separate from the recycling goal with specification of:
• The baseline year
• Target year
• Type of reduction to be measured (from the current total waste generation levels, from current per capita generation levels, or from the projected increase)
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DEVELOPING A SOURCE REDUCTION PLAN-Four Steps
2. Determine separate goals desired for:
• Generating sectors (residential, commercial, and institutional)
• Materials (paper, glass, plastics, organics, etc.)
• Products (Styrofoam cups, glass bottles, tires, cardboard boxes, newspapers, etc.)
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DEVELOPING A SOURCE REDUCTION PLAN-Four Steps
3. Select unit of measurement:
• Weight
• Volume
• Weight and volume (preferable, if possible)
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DEVELOPING A SOURCE REDUCTION PLAN-Four Steps
4. Selected measurement methodology:
• Waste audits
• Sampling (including weighing-in places such as transfer stations)
• Surveys
• Purchases (tracking sales)
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Consumer Strategies for Source Reduction
• Avoid unnecessary packaging• Adopt practices that reduce waste toxicity• Consider reusable products• Maintain and repair durable products• Reuse bags, containers and other items• Borrow, rent, or share items• Sell or donate goods instead of throwing them
out• Compost yard trimmings and food scraps
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Construction and Demolition
• 136 million tons
• 2.8 lb per person per day to landfills
• Deconstruction Efforts
• Careful dismantling of structures before or instead of demolition to maximize the recovery of materials
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Special Events
Whole Earth Festival at the University of California• Use of biodegradable utensils and can liners• Separate collection of compost• Promotion of foods that do not require utensils• Serving foods such as pizza with a napkin instead of a plate• Educational booths to inform people about composting• Use of durable items (plates, utensile, etc.)• Reward program for food vendors utilizing innovative waste
prevention programs• Not allowing the use of materials that would require
disposal
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Toxicity Reduction
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TOXICITY-PRODUCT MANAGEMENT POLICY
• Life-Cycle Analysis
• Product Bans
• Packaging Policies
• Product Labeling
• Targeted Product Procurement
• Extended Producer Responsibility
• Product Substitutes
PRODUCTION MANAGEMENT POLICY
• Clean Production
• Design for the Environment
• Toxics Use Reduction
• Integrated Pest Management
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COLLECTION OF SOLID WASTE
1. The logistics of solid waste management
2. The types of waste collection services
3. The types of collection systems, equipment, and personnel requirements
4. The collection routes
5. The management of collection systems
6. The collection system economics
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Collection Vehicles for Collection of Source Separated Waste
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Layout of Collection Routes
The four general steps involved in establishing collection routes include:1. Preparation of location maps
showing pertinent data andinformation concerning thewaste generation sources
2. Data analysis and, asrequired, preparation ofinformation summary tables
3. Preliminary layout of routes4. Evaluation of the preliminary
routes and the developmentof balanced routes bysuccessive trials
a) Route layout with overlapb) Route layout without overlap
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Recycling Materials
The materials to be recycled can include:
• paper (newspaper, cardboard, mixed paper, etc.)
• glass (amber, green, and/or flint)
• Cans (aluminum, ferrous, bimetal)
• Plastics (PET, HDPE, PS, PVC, PP, LDPE, etc.)
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RECOVERY OF RECYCLABLE MATERIALSFROM SOLID WASTE
There are three main methods that can be used to recover recyclable materials from MSW:
1. Collection of source-separated recyclable materials by either the generator or the collector, with and without subsequent processing
2. Commingled recyclables collection with processing at centralized materials recovery facilities (MRFs)
3. Mixed MSW collection with processing for recovery of the recyclable materials from the waste stream at mixed-waste processing or front-end processing facilities
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Technical Considerations in the Planning and Design of MRFs
The technical planning and design of MRFs involves three basic steps:
1. Feasibility analysis
2. Preliminary design
3. Final design
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Feasibility Analysis
• Functions of the MRF
• Conceptual design
• Siting
• Economics
• Ownership and operation
• Procurement
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Preliminary Design
• Process flow diagrams• Prediction of materials recovery rates• Development of materials mass balances and
loading rates for the unit operations (conveyors, screens, shredders, etc.), which make up the MRF
• Selection of processing equipment• Facility layout and design• Staffing needs• Environmental issues• Health and safety issues
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Final Design
• Preparation of final plans and specifications that will be used for construction
• Preparation of environmental documents
• Preparation of detailed cost estimates
• Preparation of the procurement documents
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Materials Flow Diagram for Source Separated Recyclables
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Material Flow in MRF for Source-Separated Materials
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EQUIPMENT FOR PROCESSINGOF RECYCLABLES
• Manual sorting facilities• Equipment and facilities
for materials transport• Equipment for size
reduction• Equipment for
component separation• Equipment for
densification• Weighing facilities• Movable equipment• Storage facilities
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Environmental Impacts
• Groundwater Contamination
• Dust Emissions
• Noise
• Vector Impacts
• Odor Emissions
• Vehicular Emissions
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Hazardous Waste Categories
• Ignitability includes liquids with a flash point, at standard temperature and pressure, less than 140°F
• Corrosivity includes aqueous wastes with a pH at or below 2.0 (acids) or at or above 12.5 (bases)
• Reactivity includes unstable chemicals, violentreactions with water, formation of explosive mixtureswhen mixed with water, etc
• Toxicity includes poisons and other toxic substancesthat pose a threat to human health, domestic livestock,pets, or wildlife through ingestion, inhalation, orabsorption
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PROBLEMS OF HAZARDOUS PRODUCTS
• Health Risks
• Fire Risks
• Toxic Loading
• HW in Wastewater
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SPECIAL WASTES
• Batteries
• Used Oil
• Scrap Tires
• Construction and Demolition Debris
• Computer and other electronic solid waste
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Scrap Tires Materials
• Synthetic rubber• Natural rubber• Sulfur and sulfur compounds• Silica• Phenolic resin• Oil
(aromatic, naphthenic, paraffinic, etc.)
• Fabric (polyester, nylon, etc.)• Petroleum waxes• Pigments (zinc oxide, titanium
dioxide, etc.)• Carbon black• Fatty acids• Inert materials• Steel wire
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Cleanup After Disasters
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COMPOSTING OF MUNICIPALSOLID WASTES
• Composting is the biological decomposition ofthe biodegradable organic fraction of MSWunder controlled conditions to a statesufficiently stable for nuisance-free storageand handling and for safe use in landapplications
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Typical Process Flow Diagram for Composting
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Biology of Composting
Organisms actively involved in composting can be classified into six broad groups:
1. Bacteria
2. Actinomycetes
3. Fungi
4. Protozoa
5. Worms
6. some larvae
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Classification
Aerobic vs. Anaerobic
• aerobic decomposition
• invalidating anaerobic composting
Mesophylic vs. Thermophylic
• Mesophilic is the temperature range fromabout 5 to 45°C.Thermophilic is thetemperature range from about 45 to 75°C
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Compost Phases
Lag Phase. The lag phase begins assoon as composting conditions areestablished. It is a period ofadaptation of the microbescharacteristically present in thewaste.
Active Phase. The transition from lagphase to active phase is marked byan exponential increase in microbialnumbers and a correspondingintensification of microbial activity.Unless countermeasures aretaken, the temperature may peak at70°C or higher
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Compost Phases
• Maturation or Curing Phase. In the maturation phase, the proportion of material that is resistant steadily rises and microbial proliferation correspondingly declines. Temperature begins an inexorable decline, which persists until ambient temperature is reached.
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Environmental Factors and Parameters
• Nutrients and Substrate
• Chemical Elements
• Availability of Nutrients
• Carbon-to-Nitrogen Ratio
• Particle Size
• Oxygen (COD, BOD)
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Moisture Content
Maximum• permissible maximum• optimum contentInterstitial Volume (porosity)1. the size of individual particles2. the configuration of the
particles3. the extent to which individual
particles maintain their respective configuration
MinimumpH LevelTemperatureMesophylic vs. ThermophylicComposting
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Performance Parameters
1. oxygen uptake
2. temperature
3. moisture content
4. pH
5. odor
6. color
7. destruction of volatile matter
8. stability
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Compost Systems
1. windrow
• turned type
• forced aeration
• static pile
2. in-vessel
• horizontal drum
• vertical silo
• open tank
Aeration Mechanisms
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Waste to Energy Combustion
Incineration Technologies• The volume and weight of the
waste are reduced• Waste reduction is immediate• Waste can be incinerated on-
site• Air discharges can be
effectively controlled• Incineration requires a
relatively small disposal area• using heat-recovery
techniques, cost of operation reduced
Disadvantages• The capital cost is high• Skilled operators are required• Not all materials are
incinerable• Supplemental fuel is required
to initiate
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Types of Solid Waste Incinerators
1. Open burning
2. Single-chamber incinerators
3. Open-pit incinerators
4. Multiple-chamber incinerators
5. Controlled air incinerators
6. Central-station disposal
7. Rotary kiln incinerators
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Landfilling
• Landfilling is the term used to describe the process by which solid waste and solid waste residuals are placed in a landfill
• Waste dumps oruncontrolled land disposal sites
• Secure landfills for Hazardous Waste
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a) After geo-membrane liner has been installed
b) After two lifts of solid waste
c) Landfill with final cover
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Layout of Landfill Site
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Phases in Generation of Landfill Gases
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Gas Production in Landfills
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Leachate
A liquid produced as water percolates through wastes, collecting contaminants
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Composition of Leachate
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Waste Busters Lahore
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Waste Busters Lahore
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Transfer Station/Disposal Site
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For a Cleaner Tomorrow
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Thank You
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