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1. In Metro's 2001 Residential Composting Study, a telephone survey of 606 households in single family through 4-unit dwellings found 40% used a garbage disposal unit at least 1x a day, 42% did not have a disposal unit or never used the one they had, 18% used their disposal unit infrequently. In a second question, households were asked what they did with their food scraps? 41% put them in part or entirely down the garbage disposal or drain. Households were allowed to select multiple management options. The other popular ones were disposal in garbage (71%), compost (23%) and feed to animals (18%. 2. An interesting study was published in Waste Management&Research, 2003:21:"501-514 by Carol Diggelman and Robert Ham, Un. of Wisconsin on "Household Food Waste to wastewater or to solid waste? That is the question." Of course, that is not the question but rather what are the options,impacts, including benefits that are associated with reduction, reuse, on-site composting and ultimately curbside collection for centralized composting. The Diggelman & Ham study does include a composting option, but it models separate collection of food scraps rather than the scenario that almost every city adopts, which is collection of food commingled with yard debris. The compost option in the study scores lowest in terms of all impacts except energy and air emissions. Co-collection with yard debris would change the conclusion to lowest in all areas. Finally, there is no analysis of the benefits of the finished product. In a sewage treatment plant you combine the food with toxicants (e.g. heavy metals) to make a sludge that can be land applied in limited amounts under controlled conditions. As a compost, the benefits are many and demand is high. 3. Rick Anthony has addressed this issue in an email to me several years ago.. Taking food waste out of the sewer can dramatically increase the capacity of the treatment plant. Mixing food waste, vegetative debris and food dirty paper, and collecting it for compost production will net a significant diversion in both the landfill and the sewer treatment plant, create new jobs and provide needed humus for the planet. Now that's dancing with the angels. Check out my website and the publication from Biocycle regarding the impact of food waste diversion programs on restaurants and food stores, bod and ss loadings. Richard V. AnthonyRichard Anthony Associates858 272 2905www.richardanthonyassociates.com 4. Four years ago, the New York City Council reversed anearly 40-year ban on in-house garbage grinders, after tests by the local DEP showed the system could handle the increased organic load. According to a Plant Engineer, the increased organic content would actually improve the operation of the system, as there would be more food for the little bugs to eat! 5. For background on sewage and sewage treatment, seeEXCREMENT HAPPENS -- PART 1 and Part 2RACHEL'S ENVIRONMENT & HEALTH WEEKLY #644 .April 1999 http://www.rachel.org/bulletin/index.cfm?St=4To start your own free subscription, send E-mail to .listserv@no.address with the words Steve Apotheker Senior Recycling Analyst Waste Reduction, Planning & Outreach Metro 600 NE Grand Avenue Portland, OR 97232-2736 (503) 797-1698 (503) 797-1795 fax apothekers@no.address www.metro-region.org Metro is a regional government serving three counties and 24 cities in the Portland, Oregon region. >>> Stephan Pollard <sp@no.address> 10/25/04 12:58:44 PM >>> All, In the US what's put down the in-sink disposals or in garbage compactors where they exist (and where they don't) and how much given both a diversion opportunity and the absence of one? Any citable research / information would likely be helpful, more so if it concerned multi-family dwellings. Thanks in advance. Stephan -- Stephan Pollard Environmental Dynamics Doctoral Program University of Arkansas Rm 113 Ozark Hall Fayetteville, AR 72701 Tel: (479) 575-6603 http://www.cast.uark.edu/~sp |
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