An evaluation of the economics and logistics of animal mortality composting for the Virginia Department of Transportation.
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An evaluation of the economics and logistics of animal mortality composting for the Virginia Department of Transportation.

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  • Abstract:
    Many maintenance facilities of the Virginia Department of Transportation (VDOT) face a decreasing availability of the

    conventional methods of animal mortality disposal (i.e., landfills and burial of individual mortalities) and have a need for a viable

    alternative. Others are interested in an alternative means of managing mortality that will save time and labor. Recent studies

    found that static windrow composting and in-vessel forced aeration composting systems are useful and effective means of

    managing animal mortality for VDOT, but more information is needed with regard to their cost and feasibility.

    The purpose of this study was to determine the economic value of implementing a composting program for VDOT. A

    survey was used to gather general information on animal mortality management from VDOT’s area headquarters (AHQs).

    Weekly diaries were also collected from eight AHQs and two VDOT residencies over an 8-month period to gather more detailed

    information regarding their means of mortality management. With the use of these maintenance areas as case studies, cost models

    were developed that determined the costs or savings incurred from replacing the maintenance area’s current means of disposal

    with one of three composting methods: static windrows, a rotary drum, or a forced aeration composting system.

    The study found that even the most expensive composting option currently available to VDOT, the forced air system, is

    cost-effective when there is sufficient mortality volume. Under the assumptions of the cost models, with regard to the AHQs

    evaluated, purchasing and operating the current forced air system and rotary drum can save VDOT up to $54,000 and $36,500,

    respectively, within the lifetime of the vessels. Static windrows are always cost-effective when a free carbon source (i.e.,

    woodchips from vegetative debris removal) is available. As a general rule with regard to the cost-effectiveness of composting, the

    start-up costs of the current forced aeration composting system should not exceed 22 times the operational savings from

    composting in the first year and the start-up costs of rotary drum composting should not exceed 14 times the operational savings

    from composting in the first year.

    To maximize the cost-effectiveness of composting, maintenance area superintendents who plan to use composting for

    animal mortality management should try to identify a no-cost carbon source; use finished compost for transportation project

    applications in place of purchasing comparable material; seek other maintenance areas with which to share composting facilities;

    and consider using static windrows whenever possible, including to supplement vessel composting during periods of high

    mortality. In addition, the Virginia Center for Transportation Innovation and Research should pursue the design of a forced air

    system with a smaller capacity and lower construction costs than the one presently in use. This would increase the cost-effectiveness of composting for AHQs that do not have a readily available no-cost carbon source; that have smaller mortality

    volumes; and/or for which pooling of mortality with other AHQs is infeasible. VDOT can save costs by replacing current

    mortality management methods with a composting alternative and adopting supportive business practices.

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