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16 <br />a significant portion of the study time. It may be <br />determined early that the mixed waste composting <br />technology is not viable based on observable <br />project results elsewhere. The product from mixed <br />solid waste composting, where it has been <br />successfully produced, has rarely been marketed for <br />other than landfill cover. This technology may be <br />investigated strictly as a volume reduction <br />approach with no market value for the final <br />product. <br />b. Source - Separated Compost: composting of only that <br />material which is definitely compostable. Sorting <br />could be done prior to hauling or at a centralized <br />facility. <br />C. Yard Waste Only: since yard waste will be banned <br />from North Carolina landfills after January, 1993, <br />it could provide a steady supply of compostable <br />material. Local regulations about collection and <br />penalties will be developed during 1992. <br />d. Yard Waste & Sludge Co- composting: sewage sludge <br />can be used as a nitrogen source which would enrich <br />the fertilizer value of compost. <br />G. Other mixtures and feedstocks that would <br />incorporate solid waste and sludge to make compost. <br />3. Which technologies for composting should be investigated? <br />(There is a variety of techniques available to make <br />compost.) The choice of technology would be determined, <br />to a certain extent, by the types of source - separation <br />chosen. The evaluation of the cost of these technologies <br />and the potential product will be interactive and <br />iterative based on assumptions about volume reduction and <br />the compost technology selected. <br />For example, what quality can be assumed from source - <br />separated wet (food and yard) wastes? If the wet waste <br />must be picked over at a composting plant to ensure good <br />quality compost, why go to the expense of source <br />separation in the first place? What happens to this <br />quality if source separation is mandatory? etc. <br />a. In- vessel composting <br />b. Windrows <br />C. Aerated static pile <br />d. Other <br />