Laserfiche WebLink
aluminum components of the waste stream. The decision on the amount of <br /> preprocessing will be determined by economics and the final use of the compost <br /> product. <br /> Semi-solid materials such as grit, biosolids, food processing residue, food waste, <br /> garbage, and liquid wastes such as grease, holding tank pumpings, and septic tank <br /> pumpings will be placed on other materials such as ground green material or wood <br /> waste or recycled compost and mixed as soon as possible to minimize the potential for <br /> leachate formation and odors. The amount of these materials accepted will be limited by <br /> the availability of other feed stocks. <br /> Design Alternatives <br /> Alternative 1. Figure 4 shows the layout for Windrow composting using a front end <br /> loader to turn the compost piles. Feedstock requiring preprocessing or grinding would <br /> be unloaded and processed in the RRF area. Ground and processed feedstock would be <br /> moved to the composting area using front-end loaders or dump trucks and placed <br /> into rough Windrows. Mixtures will be determined using volumetric proportions. Semi- <br /> solid and liquid feedstocks would be transported to the Windrow area and deposited <br /> directly on the rough Windrows. The quantity added would not exceed the quantity <br /> necessary to raise the moisture content to desirable limits. If semi-solid and liquid <br /> feedstocks are not available, water will be added using a water truck. The rough <br /> Windrows would then be mixed using front-end loaders. After mixing the Windrows <br /> would be formed in final configuration approximately 8 feet high and 16 feet wide <br /> at the base. Windrows would be turned as necessary to maintain aerobic conditions <br /> and for pathogen reduction in accordance with CFR 503. Turning of Windrows would be <br /> using front end loaders. A 10-foot wide aisle is provided between pairs of Windrows to <br /> allow access for the front end loader for efficient turning. Initial turning frequency would <br /> depend on the specific mixture being composted, but would be approximately every 2 to <br /> 3 days for mixtures containing MSW, sludge, septic tank pumpings, and other highly <br /> putresible materials. The turning frequency would be much less for green material and <br /> wood waste - approximately once every 1 to 2 weeks. Later in the process depending on <br /> the composting period, the Windrows would be turned about every 2 to 4 weeks. <br /> Water would be added prior to turning as necessary using a water truck to maintain <br /> moisture at the desired levels. The composting period would be approximately 4 to 8 <br /> weeks depending on the quality of the product desired and the initial feedstock <br /> composition. Initially, Forward is planning to proceed with this option. <br /> Alternative 2. Figure 5 shows the layout for Windrow composting using a Windrow <br /> turner. The process is the same as described above except a Windrow turner would <br /> be used to mix the feedstocks, create the Windrows, and turn the Windrows. The <br /> Windrow dimensions proposed are approximately 8 feet high and approximately 18 <br /> feet wide at the base. The space between Windrows is about 8 feet to provide access <br /> for a water truck for water addition and for fire control. This is Forward's next option if the <br /> need for additional composting capacity or the economics of using a Windrow machine <br /> justify the initial cost of the Windrow machine. <br /> Forward Composting Facility <br /> Z:\PROIECTS\Allied Waste\Forward\Resource Recovery Facility\Permitting Services\2009 RCSI\RCSI Final 031609.doc; <br /> Page 16 <br />