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The Board of Selectmen is seeking public comment on plans for having an anaerobic digester installed on the former landfill property on Hartwell Avenue. A draft version of a request for proposals from companies interested in building and operating the organic-waste processing facility has been posted on the town’s website, www.lexingtonma.gov, and public comments will be accepted until Oct. 24. The board is still deciding whether to support having the town host a digester operation, which uses micro-organisms to break down organic materials, such as food and yard waste, in a process that creates “biogas,’’ which can be burned to produce electricity, and leftover material that can be used as fertilizer. Opponents to the facility have raised concerns about the number of trucks that would travel in and out of the property, as well as worries about possible odors from the operation.