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(3) Design two (2) equal volume pancake type anaerobic digestion system. Design parameters are: Design example) • Amount
Posted: Mon May 16, 2022 7:15 am
by answerhappygod
- 3 Design Two 2 Equal Volume Pancake Type Anaerobic Digestion System Design Parameters Are Design Example Amount 1 (36.66 KiB) Viewed 51 times
(3) Design two (2) equal volume pancake type anaerobic digestion system. Design parameters are: Design example) • Amount of sludge: 24,000 GPD • % solids: 3.5% (80% primary and 20% WAS) 68% VS/TS Design digestion temperature: 55°C or 131°F (Thermophilic digestion temperature) Feed sludge temperature: 70°F (Southern region) 18 day SRT Completely mixed pancake type tank, Flat bottom 45% VSR assumed due to higher digestion temperature Biogas volume: 12 ft3/lb VSR Biogas heat value: 600 btu/ft3 Boiler efficiency: 80% Tank heat loss = 1 btu/hr/1000ft (a) Dimension of the tank (Diameter and tank height in ft.) Assume SF = 1.1 (b) Daily biogas volume generation (ft3/day)? (c) Total heat requirement for the digester. Please include heat for sludge and tank loss. Assume that raw sludge temperature is 70°F. Use safety factor, 1.35. (d) Design total heat generation in a dual fuel boiler in btu/hr. Use boiler efficiency, 80%.