on-site construction 3 nutrient recovery We recommend that a large part of kitchen wastes be used for direct aerobic composting. Fast aerobic composting can be achieved using a vermiculture compost, which makes use of earthworms for the fast digestion of wastes. A centralized vermiculture compost will be built on site where all de Ceuvel users can deposit their food scraps. This vermiculture system will produce compost and liquid fertilizer. Excess kitchen wastes can be macerated and manually thrown into the D-SARR system described on the previous pages. All organic wastes, from kitchen scraps to sewage, contain valuable nutrients that should be cycled back into the biological cycle. In current practice, most of these nutrients are lost into our waterways and end up causing eutrophication. There are two forms of nutrient recovery that we will be implementing as part of the CTP plan: recovery from safe, organic waste streams such as kitchen scraps and recovery from mixed wastewater streams and garden clippings. Care should be taken to ensure that no plastic, bones, citrus, or chemicals are placed in either the aerobic composter or the D-SARR. Guidelines for organic waste disposal will need to be clearly communicated to all members of the de Ceuvel community. We estimate that 0,2 kilograms of kitchen waste and 0,1 kg of other green wastes will be produced per person per day. COST & LABOR ESTIMATES A vermiculture compost can be built very inexpensively out of wooden slats and a plastic lining, costing a total of 50 € in materials costs and a total of 5 hours of labor. One or two of these composters should be sufficient for the entire community to use if they are built to be large. 4 power generation COST & LABOR ESTIMATES We estimate that an inexpensive DIY solar PV system will cost around 6.000 € per boat, and require 20 hours of installation time. The exact capacity of the system will depend on how successful boat users are at reducing their electricity demand through implementing efficiency measures. If sufficient investment can be secured, either through rental income or through additional financing, the community can purchase equipment for the generation of electricity. Despite the relatively low solar irradiance, the most practical and economically feasible solution for this scale is still solar photovoltaic cells. We recommend this investment for phase two partly to keep initial investment costs manageable, and partly to use the opportunity of phase one to measure and monitor energy use on site to come up with accurate estimates for how much electricity is required. 54 / 146 Pagina 53
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