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HettiarachchiSerena CaucciKai Schw ¤rzel [ISBN : 978 3 030 36283 6]
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HettiarachchiSerena CaucciKai Schw ¤rzel [ISBN : 978 3 030 36283 6] C) 50–60% D) 70–80% Answer: C Explanation: The editors note that organic waste can constitute up to 50–60% of total municipal waste in many developing areas. Question 4. Which of the following is NOT a direct benefit of compost application on soils? A) Increased bulk density B) Higher water-holding capacity C. Improved nutrient availability D. Enhanced microbial activity Answer: A Explanation: Compost typically lowers bulk density (makes soil more porous), not increases it. Question 5. The “Cajicá model” in Colombia is primarily cited as an example of: A) High-tech anaerobic digestion B) Successful source-separation policy implementation C. Large-scale incineration of organics D. Export-oriented compost trade Answer: B
HettiarachchiSerena CaucciKai Schw ¤rzel [ISBN : 978 3 030 36283 6] Explanation: The Cajicá model is praised for its effective source-separation mandates and community engagement. Question 6. Which factor is identified as the most common cause of failure in municipal compost programs? A) Inadequate temperature control in compost piles B) Lack of public awareness and participation C. Insufficient mechanical shredders D. Low nitrogen content in feedstock Answer: B Explanation: The text stresses that social and policy barriers, not engineering, are the main reasons programs stall. Question 7. In the context of nexus thinking, what does “closing the loop” refer to? A) Converting compost back into landfill waste B) Returning nutrients from waste to agricultural soils C. Exporting compost to other countries D. Burning compost to generate energy Answer: B Explanation: Closing the loop means the nutrients recovered from waste are cycled back into the soil-plant system. Question 8. Which of the following contaminants is highlighted as a modern risk in compost derived from municipal waste?
HettiarachchiSerena CaucciKai Schw ¤rzel [ISBN : 978 3 030 36283 6] Answer: B Explanation: Pit-based static composting, often enhanced with simple manual aeration, is widely used in Africa due to minimal capital needs. Question 11. In Europe, advanced mechanical composting systems often incorporate which technology to improve pathogen kill? A. Ultraviolet (UV) radiation chambers B. Microwave heating C. Forced-air aeration with temperature monitoring D. Cryogenic freezing Answer: C Explanation: Forced-air aeration with precise temperature control ensures thermophilic conditions for pathogen reduction. Question 12. Which policy instrument is most effective for encouraging households to separate organic waste at source? A. Subsidized compost bins B. Mandatory recycling fines C. Public awareness campaigns only D. Tax on inorganic waste Answer: A Explanation: Providing affordable, convenient bins directly lowers the barrier to source-separation.
HettiarachchiSerena CaucciKai Schw ¤rzel [ISBN : 978 3 030 36283 6] Question 13. The term “bio-char” is distinct from compost because: A. Bio-char is a liquid fertilizer B. Bio-char is produced by pyrolysis, not aerobic decomposition C. Bio-char is always synthetic D. Bio-char contains no carbon Answer: B Explanation: Bio-char results from the pyrolytic carbonization of biomass, whereas compost is aerobic. Question 14. Which of the following soil physical properties is most directly improved by adding compost? A. Electrical conductivity B. Soil porosity C. Magnetic susceptibility D. Soil pH neutrality Answer: B Explanation: Compost increases pore space, enhancing aeration and water infiltration. Question 15. A key indicator that a compost pile has reached the thermophilic phase is: A. Temperature stabilizing at 20 °C B. Presence of a strong ammonia odor
HettiarachchiSerena CaucciKai Schw ¤rzel [ISBN : 978 3 030 36283 6] Explanation: Without a reliable market, municipalities struggle to sell or use produced compost. Question 18. The book cites a case where compost use led to a yield increase of approximately: A. 5% B. 12% C. 30% D. 60% Answer: C Explanation: Studies in South Asia reported yield gains around 30% after integrating municipal compost. Question 19. Which analytical method is recommended for detecting residual pharmaceuticals in mature compost? A. Gas chromatography-mass spectrometry (GC-MS) B. High-performance liquid chromatography (HPLC) with UV detection C. Atomic absorption spectroscopy (AAS) D. Fourier-transform infrared spectroscopy (FTIR) Answer: B Explanation: HPLC-UV is widely used to quantify trace pharmaceuticals in solid matrices. Question 20. In the context of nexus thinking, “resource recovery” most accurately describes:
HettiarachchiSerena CaucciKai Schw ¤rzel [ISBN : 978 3 030 36283 6] A. Landfilling all organic waste B. Converting waste into usable products such as compost, biogas, or nutrients C. Exporting waste to neighboring countries D. Incinerating waste for ash production Answer: B Explanation: Resource recovery involves extracting value (nutrients, energy) from waste streams. Question 21. Which of the following is a primary greenhouse-gas benefit of composting over landfilling organic waste? A. Increased methane emissions B. Elimination of carbon sequestration C. Reduction of methane generation due to aerobic decomposition D. Production of nitrous oxide Answer: C Explanation: Aerobic composting prevents the anaerobic conditions that produce methane in landfills. Question 22. The “soil-water-food” loop emphasizes that improving soil organic matter directly impacts: A. Water quality only B. Food security through higher yields C. Energy consumption of irrigation pumps only D. None of the above
HettiarachchiSerena CaucciKai Schw ¤rzel [ISBN : 978 3 030 36283 6] Question 25. Which of the following best describes a “closed-loop” city-wide compost system? A. Waste is collected, turned into compost, and exported abroad B. Organic waste is composted and the product is applied back to local urban farms and gardens C. Compost is burned for energy, and ash is landfilled D. Compost is mixed with construction debris Answer: B Explanation: A closed loop keeps the material cycle within the city, returning nutrients to local agriculture. Question 26. In the nexus framework, which sector stands to gain the most immediate water-saving benefit from compost application? A. Industrial cooling systems B. Urban landscaping C. Irrigated crop production D. Municipal drinking water treatment Answer: C Explanation: Improved soil water retention directly reduces irrigation water demand for crops. Question 27. Which of the following is a key indicator that a compost pile is becoming anaerobic? A. Rising temperature above 60 °C B. Strong sour or rotten egg odor (hydrogen sulfide)
HettiarachchiSerena CaucciKai Schw ¤rzel [ISBN : 978 3 030 36283 6] C. Bright green color of the material D. Decrease in moisture content below 20% Answer: B Explanation: Hydrogen sulfide odor signals anaerobic conditions. Question 28. The presence of which heavy metal is most concerning when compost is derived from mixed municipal waste? A. Sodium B. Zinc C. Lead D. Magnesium Answer: C Explanation: Lead can accumulate in soils and pose health risks; it is often present in household waste. Question 29. Which policy approach integrates composting into national climate commitments? A. Including compost-related emissions reductions in Nationally Determined Contributions (NDCs) B. Banning all organic waste collection C. Subsidizing fossil-fuel based fertilizers only D. Ignoring waste sector in climate policies Answer: A
HettiarachchiSerena CaucciKai Schw ¤rzel [ISBN : 978 3 030 36283 6] B. Kill most pathogenic microorganisms and weed seeds C. Increase the pH to alkaline levels D. Convert all nitrogen to nitrate Answer: B Explanation: High temperatures (>55 °C) are effective at sanitizing the material. Question 33. In the case studies presented, which city achieved a 45% diversion rate of organic waste through source-separation? A. Bogotá, Colombia B. Nairobi, Kenya C. Jaipur, India D. Medellín, Colombia Answer: D Explanation: Medellín’s program reported a 45% diversion via household separation and collection. Question 34. Which of the following is a primary driver for adopting composting in water-scarce regions? A. Desire to increase landfill capacity B. Need to enhance soil water retention and reduce irrigation demand C. Requirement to produce more biogas for power D. Preference for synthetic fertilizer use Answer: B
HettiarachchiSerena CaucciKai Schw ¤rzel [ISBN : 978 3 030 36283 6] Explanation: Compost improves soil’s ability to hold water, crucial where water is limited. Question 35. The “C/N ratio” of mature compost typically falls within: A. 1–5: B. 10–20: C. 30–40: D. 50–60: Answer: B Explanation: Mature compost usually has a C/N ratio between 10 and 20, indicating balanced carbon and nitrogen. Question 36. Which microbial group is most responsible for the rapid breakdown of easily degradable organics during the initial composting phase? A. Methanogens B. Thermophilic actinomycetes C. Mesophilic bacteria (e.g., Bacillus spp.) D. Mycorrhizal fungi Answer: C Explanation: Mesophilic bacteria dominate the early, moderate-temperature phase, consuming sugars and proteins. Question 37. The term “biochemical safety frontier” in the book refers to: A. The legal limits for compost export
HettiarachchiSerena CaucciKai Schw ¤rzel [ISBN : 978 3 030 36283 6] Answer: B Explanation: Co-processing organic waste in anaerobic digesters generates biogas, an energy product. Question 40. Which of the following is a major reason why traditional composting methods may be unsuitable for densely populated urban areas? A. High capital cost of equipment B. Large land area requirement for static piles C. Need for advanced temperature sensors D. Requirement for high-tech training Answer: B Explanation: Space constraints limit the feasibility of large static piles in compact cities. Question 41. The presence of which gas is an indicator of incomplete aerobic composting? A. Oxygen B. Nitrogen C. Methane D. Helium Answer: C Explanation: Methane forms under anaerobic conditions, indicating insufficient aeration.
HettiarachchiSerena CaucciKai Schw ¤rzel [ISBN : 978 3 030 36283 6] Question 42. Which of the following is a recommended practice to prevent the spread of weed seeds through compost? A. Adding herbicide to the pile B. Maintaining thermophilic temperatures for at least 3 consecutive days C. Using only leaf litter as feedstock D. Immediate application without curing Answer: B Explanation: High temperatures destroy most viable weed seeds. Question 43. In the case studies, which African country demonstrated a low-cost composting adaptation using “banana leaf shelters”? A. Kenya B. Ethiopia C. Tanzania D. Ghana Answer: C Explanation: Tanzania’s community projects employed banana leaf shelters to retain moisture in simple pits. Question 44. The main environmental advantage of compost over synthetic nitrogen fertilizer is: A. Higher nitrogen content per kilogram B. No associated greenhouse-gas emissions from production C. Immediate release of nitrogen to plants
