Presentation on theme: "Chapter 17: Solid and Hazardous Waste"— Presentation transcript:
1 Chapter 17: Solid and Hazardous Waste By Kelsey Connolly, Bianca Dawydiak, and Drew Kennett
2 Case Study: Love CanalBetween 1942 and 1953 a company called Hooker Chemicals and Plastics sealed over 200 different kinds of toxic chemical wastes into steel drums.Drums placed in the bottom of an old canal excavation, covered in thin clay topsoil and sold to Niagara Falls School Board.Roads and sewer lines disturbed clay top and water build up broke through cap releasing chemicals that had leaked from corroded containers.Children received chemical burns at school, toxins leaked into school grounds, basements, gardens, and storm sewers.Jimmy Carter declared Love Canal a Federal Disaster area, and evacuated all families that lived close to the dump and closed schools in that area.After 21 years and $400 million in clean up costs, Love Canal was finally removed from the list of Superfund sites that were in need of toxic clean up.
3 The Three Lessons1. We can never really throw anything away. 2. Wastes do not often stay put. 3. Preventing pollution is safer and easier then cleaning it up.
5 Science: Solid Waste- Solid Waste: Any unwanted or discarded material that is not a liquid or a gas, known as garbage. - Humans will always produce solid waste in direct and indirect ways as a result of creating goods and services. - In nature there is virtually no solid waste because the waste of one organism becomes nutrients for others. - Two Main Concerns About Solid Waste Production: 1. Much of the waste represents an unnecessary waste of the earths resources. 2. Producing the solid products we use and discard leads to huge amounts of air pollution, water pollution, and land degradation.
6 Solid Waste In The United States - The U.S. has 4.6% of the worlds population, and produces 1/3 of the worlds solid waste. - Mining, oil, and gas production are responsible for the majority (75%) of the U.S.’s solid waste. - Solid Waste Percentage Breakdown: a) 98.5% produced indirectly through mining, oil and natural gas production, agricultural, sewage, and other industrial activities. b) 1.5% produced directly by households and workplaces (Municipal Solid Waste)
7 Municipal Solid Waste- This 1.5% directly produced waste is formally called Municipal Solid Waste (MSW), and is also known as garbage or trash. (U.S. produces the most per capita, and Canada the 2nd most.)- Between 1960 and 1990 the amount of MSW produced per person in the U.S. increased by 70%.Over half (55%) of MSW is buried in land fills, only 30% is recycled and the remaining 15% is burned in incinerators.
9 Waste Management and Reduction - Two Ways To Deal With Solid Wastes: Waste Management and Waste Reduction 1. Waste Management – (high-waste approach) views waste production as unavoidable and attempts to manage waste by mixing and crushing wastes, then burying, burning, or shipping them away. - EXAMPLES: treat waste to reduce toxicity, incinerate waster, bury waste in landfills, dilute waste into environment. 2. Waste Reduction – (low waste approach) mimics nature by viewing solid waste as potential resources that should be recycled, composted, or reused. - EXAMPLES: *Discussed in the Sustainably Six* - Benefits: saves matter and energy resources, reduces pollution, protects biodiversity, and saves money.
10 Reducing Solid Waste- The Sustainably Six: 6 ways to reduce resource use, waste, and pollution. 1. Consume Less: can whatever your purchasing be bought or borrowed second hand? 2. Redesign Manufacturing Processes And Products To Use Less Materials And Energy: the weight of cars has been reduced by ¼ by using lightweight plastics, plastic milk jugs weight 40% less then they did in Redesign Manufacturing Processes To Produce Less Waste And Pollution: most toxic organic solvents can be replaced with water or citrus based solvents. 4. Develop Products That Are Easy To Repair, Reuse, Remanufacture, Compost, Or Recycle: a new Xerox photocopier is made completely with reusable and recyclable parts. 5. Design Products To Last: tires could be build to last for 100,000 miles instead of their current average of 60,000 miles. 6. Eliminate Or Reduce Unnecessary Packaging: use no, minimal, reusable, or recyclable packaging.
11 Making a Difference- Actions individuals can take to promote waste reduction: - Follow the four R’s: Refuse, Reduce, Reuse, Recycle. - Rent, borrow, or barter goods whenever possible. - Don’t throw away disposable items if they are reusable or recyclable. - Use in the place of paper mail. - Read newspapers and magazines online.
13 The Ecoindustrial Revolution - Current advancements point to this revolution occurring in the next 50 years. - Goal: make industrial manufacturing process cleaner and more sustainable by redesigning them to mimic that natural process of waste management. - Methods of Biomimicry: - Reuse chemicals in industries instead of dumping them. - Have companies interact through resource exchange webs in which wastes from one manufacturer become raw materials for another. - EXAMPLE: An electric power plant in Kalundborg, Denmark trades waste outputs with nearby industries, farms, and homes to reduce their pollution and waste output. - Currently 20 of these Ecoindustrial Parks are operating around the world. - Many of these parks are being developed on redeveloped abandoned industrial sites called brown fields.
14 Economic Benefits of Biomimicry - Reduce cost of controlling pollution and complying with pollution regulations. - If company doesn’t pollute, it doesn’t have to worry about government regulations or being sued for environmental damage. - Improves health and safety of the workers: reduces exposure to harmful toxic chemicals in the workplace. - Reduces cost of health care for employees. - Stimulates companies to come up with new environmentally friendly chemicals.
15 Economics: Selling Services - German chemist Michael Braungart and Swiss Industry analyst Walter Stahel proposed a new economic model that would provide profits while reducing resource use and waste. - Their proposal was to shift from the current material-flow economy to a service-flow economy. - Consumers would use eco-leasing to rent services certain goods provide instead of buying the goods themselves. - In a service-flow economy a manufacturer would make more money if a product uses a minimum amount of materials, lasts a long time, and is easy to repair, maintain, remanufacture, reuse or recycle.
16 Selling Services Example Carrier (the worlds largest manufacturer of air- conditioning equipment) leases cooling services where the company teams up with other industries to install up to date windows, lighting, and other energy efficient upgrades that reduce customers cooling needs. The company profits off the instillation of the equipment.
18 Reuse: Advantages and Disadvantages - What Reuse Involves: Cleaning and using materials over and over, thereby extending the life span of a product. - Traditional Forms of Reuse: Salvaging automobile parts, and salvaging bricks, doors, woodwork, and other items from old buildings. - Benefits of Reuse: Reduces the use of matter and energy resources, cuts pollution and waste, creates local jobs, saves money. - Disadvantages of Reuse: The harvesting of resources for reuse poses major health hazards people in poor developing countries. The main hazard comes from electronic waste.
19 Electronic WasteE-Waste: consists of discarded TV sets, computers, circuit boards, cell phones, ect… - E-waste is shipped in from countries like the U.S. to developing countries like China, India, and Pakistan where labor is cheap and environmental regulations are weak. - Workers dismantle the e-waste to recover the reusable parts and metals within, and in doing so expose themselves to toxic wastes such as lead, mercury, and cadmium. - The unusable parts are then dumped into waterways and fields, or burned in open fires, which expose the workers to more toxic dioxins.
20 17-4 Using Refillable Containers Uses less resources and energyProduces less wastesSaves moneyCreates local jobsLocal collecting & refillingIntroduce a levy that encourages the reuse of containers
21 Other Ways to Reuse Things Reusable shopping bagsUse cloth bags & charge for plasticMetal food containersLess plastic thrown awayRecycled shipping palletsUses recycled plastic instead of woodBorrow tools from tool librariesPeople can check out a variety of power & hand toolsBerkeley, CA has this
22 17-5 RECYCLING: Two Types of Recycling Collect, reuse, remake, resellFive types of materials can be recycled: newspapers, magazines, office paper, glass, aluminum, steel, and some plasticsPrimary collection or closed loop recycling:Takes old materials & makes them into newI.e. used aluminum cans into newSecondary recycling or downcycling:Waste materials converted into different productsI.e. tires are shredded & turned into rubberized road
23 Two Types of Recycling Continued Two types of wastes can be recycled:Preconsumer or internal wasteGenerated in a manufacturing process & recycled instead of being discardedPostconsumer or external wasteGenerated by consumer use of products25 times more preconsumer than post.
24 Two Types of Recycling Continued Two issuesWill it actually be recycled?When prices fall for recycled materials recyclables are collected but mixed with wastes & sent to landfillWill businesses actually want recycled materials?Switzerland recycles ½ of their waste, US 30%With more incentives & better designed waste management systems, developed countries will recycle more
25 CompostingProcess in which recycled biodegradable organic wastes are added to soil to supply plants with nutrientsSlows erosion, retains water, & improves crop yieldsWastes can be collected & composted in facilities (done in many EU countries) compost used as fertilizer, topsoil, landfill cover, restores eroded soil and overgrazed soilTo be successful, odors must be controlledMust exclude toxic materials that can contaminate compost
26 Methods for Recycling Solid Wastes Disagreement over whether to send MUW to centralized resource recovery plants or have individuals sort recyclablesMRF (material recovery facility) has machines separate waste to recover valuable materials to be resoldRemaining wastes are burned for powerExpensive, emits toxic air pollutants & toxic ashSource separation has less air & water pollution, low costs, saves more energy, provides jobsPay-as-you-throw: encourages separation of wastes. Households charged for amt of waste produced, but not for collectionMixed Urban Wastes= MUW
27 Problems with Recycling Plastics Chemically & economically difficult10% of plastics in US are recycled for 3 reasonsDifficult to isolate from other wastes (use dif. resins)Recovering plastics doesn’t yield much because only small amts. of resins used per productCost of petrochemicals used for making plastics is so low that the cost of new plastic resins is much lower than recycledToyota is investing in making plastic from plantsExpected by 2020 to control 2/3 of world’s supply of bioplastics
28 Advantages & Disadvantages of Recycling Environmental & economic benefitsCheaper to burn wastes or send to landfillMakes sense for paper, aluminum, paper, & steelNot for glass and most plasticsNet economic, health, & environmental benefits of recycling far outweigh the costsSingle-pickup system: collects both materials to be recycled vs. expensive dual-systemPay-as-you-throw: SF uses this, recycles ½ of waste
29 Encouraging Reuse and Recycling Four factors hinder reuse & recyclingMarket $ of a product does not reflect harmful environment costsUneven playing field- Most resource extracting industries get tax breaks, while recycling companies don’tCharges for depositing wastes in landfills is cheaper in US than in EuropeDemand & price paid for recycled materials fluctuate
30 Encouraging Reuse and Recycling Continued How can we encourage recycling?Tax breaks and subsidiesDecrease subsidies for virgin itemsIncrease the cost of pay-as-you-throwGov. can make companies take back their products after use and dispose of them
31 17-6 BURNING AND BURYING SOLID WASTES Japan & Switzerland incinerates most of their waste, US & most of Europe does notSolid waste is burned in waste-to-energy incinerators: boils water to make steam for heating water for electricityUS incinerates 16% of their wasteMany incinerator projects have been cancelled because of high costs and concern over pollutants
32 Burying Solid WasteMost of world’s solid waste is buried in landfills that will eventually leak toxic liquids into the soil & underlying aquifers54% of waste in US is buried in sanitary landfillsTwo types of landfills:Open Dumps: fields or holes in the ground where garbage is dumped & sometimes covered with soilUsed in developing countries1000s of people works & live in open dumps looking for food scraps & reusable materials
33 Burying Solid Waste Continued Sanitary Landfills: solid wastes are spread out in thin layers, compacted, and covered daily with a fresh layer of clay or plastic foamLocated away from rivers & recharge zones are covered with clay or plasticLandfill bottom is covered with a second impermeable liner, usually made of thick plastic, sand, & clayLiner collects leachate (contaminated rainwater that percolates through waste)Wells are drilled around landfill to monitor any leakageLeachate is pumped from bottom of landfill, stored in tanks, and sent to a sewage treatment plantLandfills have a network of pipes to collect methane and carbon dioxide released by underground decomposition of wastesMethane is filtered out & burned to produce electricity
34 Hazardous wasteDiscarded solid or liquid material that is toxic , ignitable, corrosive , or reactive enough to explode.Developed countries = 80-90%Cradle-to-graveProduction( Cradle)Disposal(Grave)
35 Harmful Chemicals in your home. PaintLatex and oil based paints, stains, varnishes, wood preservatives, artist paints and oils.AutomotiveGasoline, motor oil, antifreeze , battery acid, solvents , brake fluidGardeningPesticides, weed killers , ant and rodent killers, flea powdersCleaningDisinfectants, drain and toilet cleaners, spot removers , septic tank cleaners
36 How safe is the U.S.?15,000 chemical plants refineries, and other sites.At 790 sites the potential death toll is 100,000 to 1,000,000.Easy targetsNo security laws
37 Detoxifying Hazardous Waste Chemical and biological methods for removing hazardous wastes;Bioremediation- uses bacteria and enzymes to destroy toxic waste or convert them to harmless compounds.Phytoremediation- uses natural gas or genetically engineered plants to absorb, filter, and remove contaminates from soil and water
38 Trade-offs: Phytoremediation PROSEasy to establishInexpensiveCan reduce material dumped into landfillsProduces little air pollutionLow energy useCONSSlowEffective only at depth of plant rootsSome toxic organic chemicals may evaporate form plant leavesSome pants can become toxic to animals
39 Burning and burying solid wastes Hazardous wastes can be incinerated or buried.Burning hazardous wastes can have the same effects as burning solid wastes.U.S. disposes hazardous waste in underground wells or state-of- the-art landfills.Liquid and solid hazardous wastes are sometimes stored into drums in secure landfills or in secure above ground buildings.Deep-well disposalSurface impoundmentsBest solution: make as little as possible.
40 Toxic metals Lead and mercury not break down in nature. Lead is found in gasoline , water lines, pipes , faucets , and some paints.Mercury found in rocks, soil, volcanoes, and the ocean.
41 Solutions to Lead Poisoning PreventionPhase out leaded gasolinePhase out waste incinerationTest blood for lead by age 1Ban lead solder in plumbing pipes, fixtures, and food cansBan candles with lead coresControlReduce lead emissions from old and new incineratorsReplace lead pipes and plumbing fixtures containing lead solderRemove leaded paint and dust from older apartmentsRemove lead from TV sets and computer monitors before disposalWash fresh fruits and vegetables
42 Solutions for Mercury Pollution PreventionPhase out waste incinerationRemove mercury from coal before it is burnedConvent coal to liquid or gaseous fuelSwitch from to coal to natural gas and renewable energyPhase out mercury from all products non recyclable.ControlReduce mercury emissions from coal burning plants and incineratorsTax each unit of mercuryCollect and recycle mercury containing electric switches, relays , and dry-cell batteries.Require labels on all products containing mercury.
43 International Action1989 and 1994 an international treaty to limit the transfer of hazardous waste was developed.2000, treaty to control 12 persistent organic pollutants(POPs)Dirty dozen; DDT, 8 other chlorine containing persistent pesticides ,PCBs, dioxins, and furans.
44 4 Key Principals Everything is connected There is no “away” for the wastes we produceDilution is not always the solutionThe best and cheapest way to deal with waste and pollution is to produce fewer pollutants and to reuse and recycle.