Composting 101 Prepared by the HLS Green Team and Green Living Program, updated February 2011

Transcription

1 Composting 101 Prepared by the HLS Green Team and Green Living Program, updated February 2011 Americans generated 31.8 million tons of food waste in 2008 (12% of the total waste stream) and only 2.5% was composted. The environmental effect of NOT trashing this mass would be equivalent to removing 5.8 million cars from the road. ( 1 What is Compost? Compost is the product of a biological process during which naturally occurring aerobic (oxygen-requiring) microorganisms break down organic materials such as food waste into humus, a nutrient-rich material that can be used to improve soil quality. During the composting process, the microbes use inputs of oxygen, moisture and organics to generate heat, water vapor, and carbon dioxide as they transform organics into humus. 1 Emissions avoided by composting are not included in Scope 1 savings for Harvard s Greenhouse Gas Reduction Goal.

2 Why Compost? Emissions avoidance: Organics degrading in landfills without air emit methane (a greenhouse gas 21 times more potent than CO2). Composting adds oxygen to organic waste, so it emits only CO2 as part of the natural carbon cycle during decomposition. Soil enrichment: Provides nutrients for soil Helps soil retain moisture Reduces soil pollution Reduces need for pesticides Water management: Improves soil absorption, decreasing erosion Improves soil filtration, decreasing polluted storm-water runoff Economic benefit: Reduces need for water, fertilizers, and pesticides Extends landfill life Provides a cost-effective alternative to conventional methods of cleaning contaminated soil (

3 Composting at Harvard Composting at Harvard Today: Harvard recovers nearly 4,000 tons of compostables annually, including food scraps and landscape waste. Food scraps from nearly all food preparation facilities at Harvard are composted. Many University cafés also offer front of the house composting including the Hark here at the Law School, Chauhaus at the Graduate School of Design, Rockefeller Refectory at the Divinity School, the Greenhouse at the Science Center, the Barker Center Café, Sebastian s at the School of Public Health and others. Compost is an essential component of Harvard s Organic Landscaping efforts. Over the past several years, the Landscape Services team in the Facilities Maintenance Operations group (FMO) has been transitioning its maintenance programs from conventional to fully organic methods. Each year at the Facilities Maintenance Operations Compost Facility in the Arnold Arboretum, Landscape Services converts more than 500 tons of leaves, grass clippings, tree branches, and other landscape waste and reintroduces it to the Harvard landscape in the form of compost, mulch and "compost teas" that suppress disease and deter pests. To learn more about our organic landscaping practices, visit The Opportunity: Harvard Wide: Waste audits have determined that Harvard-wide, compostable food scraps and soiled paper represents 25% of our total waste. AT HLS: In the fall 2010 dorm waste audit, HLS Green Living Representatives found 41% of waste found in the trash could have been composted. Over the course of the year, composting all organics in dorms could save 7.1 MTCDE, or the equivalent of removing 1.2 cars from the road. Composting at HLS Composting occurs in 3 ways at HLS: At the Hark: Restaurant Associates, the Law School s food service provider, has partnered with Harvard Recycling and Save that Stuff to compost all food waste and napkins from food service activities. This helps us divert over 50 tons of material each year. All food scraps from food preparation are composted back-of-house, and bins are available for front-of-house composting in the Harkness café, HarkBox and Hark patio during the outdoor dining season. To help you properly sort leftovers, there are signs posted above bins showing you which materials go where. It is very important that only compostable materials go into compost bins other items, particularly plastic and metal, are harmful for the farms which use our finished compost! In the Hark, you may leave leftover food, napkins, tea bags, wooden coffee stirrers, and other compostable products on your plate when you bus your tray to the Hark dish drop, and RA staff will take care of the rest.

4 Event composting: Composting is available for set-up at all events. If you are booking a space through the Events Scheduling and Support Office, please indicate that you are interested in learning more about event composting when you fill out your full-service form. Along with your room confirmation you will receive a copy of the HLS Event Composting Guide. Contact the HLS Sustainability Coordinator at [email protected] or to discuss your event composting options and any questions you may have, as well as to receive compost signs Event composting takes place at events as diverse as the Class Day reception and Commencement luncheon, HLS Staff Picnic, Green Living Program study breaks, Green Team meetings, and Facilities Management meetings. Building composting: Compost bins are located in every dorm and academic and administrative building. Find the location nearest you below! Where can I compost in academic and administrative buildings and dorms? Building Bin Location Building Captain Hauser 4th floor kitchen Eleanor Topping [email protected] 125 Mt Auburn 2nd floor lounge Carla Gannon [email protected] 23 Everett St Kitchen - room 205 Meghan Owen [email protected] Austin 1st floor coffee station Carrie Ayers [email protected] Areeda Staff lounge Karen Thomas [email protected] Griswold 3rd floor lounge Alyssa Lary [email protected] Lewis 1st floor lounge Diane Long [email protected] Pound 3rd floor lounge Pete Melish [email protected] Hayley Brown [email protected] Story 1st floor entryway Trisha Kingsbury [email protected] Gannett House Kitchen Jennifer Heath [email protected] Hastings Kitchen Sameer Birring [email protected] Dane 1st floor kitchen Jenny Lee [email protected] Ames 3rd floor kitchen Jenny Lee [email protected] North 1st floor trash room Stephanie Young [email protected] Shaw 2nd floor kitchen Amrit Dhir [email protected] Holmes 1st floor - Facilities Amrit Dhir [email protected] Look for the green bins around campus!

5 What CAN be composted? ALL food waste (including grains, breads, meat, bones, dairy, fruit peels and seeds, vegetables, tea bags and coffee grounds, paper filters) napkins paper towels compostable coffee cup sleeves from the Hark compostable Greenware cups from the Hark Compostable soup cups from the Hark compostable take-out containers from the Hark wood coffee stirrers and chopsticks Soiled paper take-out food boxes Plants and leaves including houseplants and soil, yard waste and flowers What CANNOT be composted? Coffee cups and lids Soup lids from the Hark sugar packets (these are lined with plastic coating that does not biodegrade) plastic ketchup or similar single-serve dressing and sauce packets styrofoam paper coffee cups not from the Hark (most coffee cups are lined with plastic) paper plates (most paper plates are lined with plastic) food wrappings (chips, cookies, etc.) plastic and metal used tissues

6 Why is it so important that the compost is not contaminated with ANY NON BIODEGRADABLE waste? Non-biodegradable waste does not break down during the composting process, and will result in contamination - like bits of plastic or metal in the end product generated by the compost facility. In order to ensure the continuation of our building composting program, we must make sure our organic waste is uncontaminated so the compost facility will continue accepting it. If you are unsure as to whether something is compostable, please throw it in the trash or recycle it; contamination is harmful. When in doubt, throw it out! Where will our compost go? Our custodians will pick up compost on the same schedule as trash and recycling pick-up: daily in dorms and every other day in academic buildings. Our 2 collection vendors - Save that Stuff and Herb s Disposal take HLS organic waste to Brick Ends Farm in Hamilton, MA. The end product is purchased by municipalities for soil application in parks, cemeteries, roadsides etc or given to organic farmers in MA. By contrast, Harvard s trash travels 80 miles to Rochester, New Hampshire. Reducing the amount of waste we send to landfill helps reduce Harvard emissions associated with waste transport. The commercial compost facilities where we send our organics create and monitor optimum conditions (temperature, moisture, aeration, feedstocks and their size) to create rapid aerobic composting. In these facilities, it takes from 3-12 months to turn organics into a valuable soil amendment. Compostable Products What are Compostable Products? The Hark offers biodegradable disposable service-ware that can be composted. These products (including cups, bowls and take-out clamshells) are made from renewable resources and will bio-degrade in the commercial composting environments. The products are not derived from petroleum but from plant materials including vegetable oils and starches and molded fibers such as bagasse (sugarcane) and grasses, etc. The lifecycle costs and emissions generated by the compostable products we use at the Hark are less than or equal to those of traditional recyclable disposable products. In order for a product to be considered compostable, it must: 1. Biodegrade the material s carbon chains break down by naturally occurring microorganisms (bacteria, fungi, etc) into energy (heat), carbon dioxide, water, and biomass at the same rate as cellulose (paper). 2. Disintegrate - be indistinguishable in the compost, that is, not visible or able to be screened out.

7 3. Not be eco-toxic- not produce any toxic materials; resulting compost can support plant growth. How can I tell if a service item is biodegradable? See list below of compostable Harkness serviceware. Harvard uses BPI certification as our accepted standard for what is compostable, so look for the BPI logo (below) and/or check labeling - plastic made from bio-degradable plastic usually say PLA (which stands for poly-lactic acid), and/or COMPOSTABLE on the bottom. If you bring in a cup, plate, etc. from an outside vendor, it most likely is NOT bio-degradable and should be placed in the WASTE bin (even paper coffee cups and paper plates usually have a plastic lining, and are not compostable). Not sure if something is compostable? Contact the HLS Sustainability Coordinator at [email protected] or TIP: Always purchase compostable plates and utensils certified by the Biodegradeable Products Institute ( Compostable Serviceware Offerings at the Hark: Greenware cups ( o Made from PLA (polylactic acid or Polylactide), a corn derivative. o Products use a PLA made by NatureWorks, which is currently made from No. 2 yellow dent field corn grown within a 300-mile radius of their Nebraska facility. When at capacity, NatureWorks LLC will use less than one half of one percent of the available U.S. corn crop to make PLA. Lifecycle analyses found Greenware cups are 30-50% less energy intensive to produce than traditional plastic and emit 24-55% less greenhouse gases. ( Biodegrade 100% within 50 days in commercial composting facilities Ecotainer products (hot cup sleeves, soup bowls and lids): o Products are paper fibers coated with PLA (also NatureWorks brand). o Paper fibers made from trees certified to adhere to the Sustainable Forestry Initiative (SFI ) guidelines for management and harvesting. No trees from old-growth or endangered forests are used. More than twothirds of the energy used to make the paperboard comes from renewable resources. Earthsmart products (take-out containers and plates/bowls): o Made of bagasse, a sugar cane derivative. o Production of bagasse products use ¼ of the water and energy and creates ½ the emissions used to produce comparable paper products.

8 ***Note compostable containers are not intended to be used in the microwave, and do not hold up as well when heated.*** I am concerned about using a food source, such as corn, as packaging when there are so many global food shortages. This is an incredibly complicated issue, and we don t have an easy answer, but agree that this is a serious problem and should be addressed at all levels. For now we feel the positive waste reduction and greenhouse gas emissions reduction benefits outweigh the negatives from use of these biodegradable products, but will continue to learn about this issue and will consider all impacts of our choices for future decisions. Additional Resources and Information How can I set up composting at home? If you have space outside to keep a bin, check with your municipality to purchase a bin and for guidelines. If you don't have space outside, you can still compost inside, with vermicomposting (worms). Check out to learn more. Cambridge Purchase a backyard bin (50$) and learn more about Cambridge composting by visiting the Cambridge Department of Public Works. Cambridge residents may also bring bring food scraps (in a paper bag or reusable pail) to the Recycling Drop Off Center at 147 Hampshire Street Tues/Thurs 4-7:30pm & Sat 9-4pm. Food scraps may also be brought to Whole Foods (115 Prospect St) every day from 8am-10pm, to toters located in the rear of the parking lot on the left side. To learn more, visit ml. Boston Purchase an outdoor compost bin from the City of Boston ($50) from the Boston Building Materials Co-op, 100 Terrace Street, Mission Hill, To learn more, visit Elsewhere in MA Check out your town s recycling or public works page for more information, and visit Composting in Massachusetts: The MassDEPs compost bin grant program began with a fiscal year 1993 pilot project in western Massachusetts. About 5,300 bins were distributed to residents of the region. A follow-up survey revealed that 92 pecent of the bins were in use one year later, and that people were putting out an average of 27 percent less garbage for disposal after they started composting. The MassDEPs compost bin grant program began with a fiscal year 1993 pilot project in western Massachusetts. About 5,300 bins were distributed to residents of

9 the region. A follow-up survey revealed that 92 pecent of the bins were in use one year later, and that people were putting out an average of 27 percent less garbage for disposal after they started composting. Other resources 1. United States Composting Council: 2. EPA: 3. Boston Globe Magazine article: Municipal Composting in Boston?: mandatory_composting/