Reactor Type

a. Anaerobic contact process b. Anaerobic upflow sludge blanket (USB) reactor c. Anaerobic filter (downflow or upflow)

d. Anaerobic fluidized-bed reactor (AFBR)

a: 2-10; b: 4-12; c: 24-48; and d: 5-10 ORGANIC LOADING (lb COD/ft3-day)

a: 0.03-0.15; b: 0.25-0.75; c: 0.06-0.3; and d: 0.3-0.6 COD REMOVAL FOR INDUSTRIAL WASTEWATER (%) a: 75-90; b: 75-85; c: 75-85; and d: 80-85

OPTIMAL TEMPERATURE (°C)

30-35 (mesophilic) and 49-57 (thermophilic)

OPTIMAL pH 6.8-7.4

OPTIMAL TOTAL ALKALINITY (mg/l as CaCOJ 2000-3000

OPTIMAL VOLATILE ACIDS (mg/l as acetic acid) 50-500

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