Basic Process CHONS + y H₂O → × CH4 + (c-x)CO2 + n NH4 + s H₂S * S x = 1/8 (4ch -20 - 3n - 2s) y = 14 * (4c-h - 20 + 3n+ 3s) No oxygen! 6-3. Using the approximate chemical analyses of refuse-C,,H14,05,N- what is the empirical formula for the organic fraction of refuse? Estimate the theoretical production of methane from this hypothetical compound. 6-4. Describe how your community manages its organic waste. 6-5. Suppose you are a city engineer. An advertisement appears in a trade journal for a new in-vessel compost- ing system that produces methane gas as a valuable end product. Your city manager, who has no technical training, asks you to find out more about this system. You decide to write a letter to the company, Bioscam Inc., requesting more information. What questions would you ask? Write such a letter. 6-6. Assume a rough estimate of MSW composition is as follows: % By Weight Paper (assume all 50 cellulose, CH,Os) Glass 10 Steel Aluminum 10 00020 10 Food waste (assume sugar CH₁₂O) If 10,000 metric tonnes of this mate- rial is placed in a landfill, how much methane gas would theoretically be produced by anaerobic decomposition? 6-7. Suppose a wet mixture of old bread, leaves, and soil is placed in a pile 1 m tall, and a long thermometer is stuck in the middle of the pile. Every other day, the pile is aerated by throwing the mixture into a new pile. Draw a graph showing the temperature in the pile during the first two weeks and explain why these temperature changes occurs. 6-8. An industry operates a landfill into which an organic waste having the formula CHO decays anaerobically. How much methane gas will be generated if the decomposition is complete? Express your answer as "lb gas/lb waste." a. b. Realistically, given the nature of the anaerobic reaction, how much methane gas might actually be produced (approximately)? Why only this much? 6-9. Estimate the production of CO2 and CH during the anaerobic decomposition of ethanol, CHO. 6-10. What would be three good uses for methane collected from a landfill? 6-11. Describe how a Kompogas in-vessel composting system works.