TAILIEUCHUNG - Waste Water Evaluation and Management Part 15

Tham khảo tài liệu 'waste water evaluation and management part 15', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Sewage Sludge Disposal and Applications Self-heating and Spontaneous Combustion of Compost Piles - Trace Metals Leaching in Volcanic Soils After Sewage Sludge Disposal 409 Fig. 6. Time evolution of temperature for four piles with different heights. Fig 7. Time evolution of oxygen concentration for four piles with different heights. 410 Waste Water - Evaluation and Management Fig. 8. Time evolution of energy and oxygen consumption for four piles with different heights. Fig. 9. Distribution of temperature and oxygen concentration within a compost pile trapezoidal geometry. Heat and mass transfer inside a non-symmetric trapezoidal sludge pile with an 8x8 m base and lateral walls inclined at angles of 9 and p caused by chemical and biological reactions are described in Figure 10 in terms of temperature and oxygen distribution. Self-ignition started on day 215 when a maximum temperature of 513 K was achieved. A narrow region with high temperature gradients can be observed in the lower central region of the pile on day 217. At this time the self-ignition front is closer to the bigger lateral wall with p and therefore smoke production can be expected to begin there. During self ignition the zone with maximum temperature between 516 and 519 K reached between days 217 and 253 is closer to the shorter lateral wall. Sewage Sludge Disposal and Applications Self-heating and Spontaneous Combustion of Compost Piles - Trace Metals Leaching in Volcanic Soils After Sewage Sludge Disposal 411 Fig. 10. Distribution of temperature and oxygen concentration within a compost pile asymmetric geometry. Fig. 11. Distribution of temperature and oxygen concentration within a compost pile polynomial geometry. Time evolution of temperature and oxygen concentration distributions at 209 247 275 and 300 days for an asymmetrical compost pile with two different height bumps with maximum heights of 3 m and 8 m at the base are shown in Figure 11. Self-ignition occurs near the base of the

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