The load to the plant is increased to 225 m3/day (59,400 gal/day).
(a) Anaerobic process. New effluent concentration; from example 3: SRTmin=15 days; T= 35°C; a=0.14; b=0.02; ¿'=0.0005 L/(mg-day); Xv=5000 mg/L; CODR=10,500 mg/L; and volume=648 m3 (0.1712 MG). The new detention time is:
The COD effluent from the anaerobic process can be estimated by:
The COD removed is: CODremoved=CODR-CODE = 10,500-1273 =9227 mg/L
Check SRT using the equation:
New gas production. The sludge yield is:
= (0.14x9227-0.02x5000x2.9) mg/Lx59,400 (lb/MG)/mg/L
The mass of COD removed per day is:
=9227 mg/Lx59,400 gal/dayx8.34x10-6 =4571 lb/day (2076 kg/day)
5r=9227 mg/Lx225 m3/dayx10-3=2076 kg/day
The methane production can be estimated from: G=5.62(Sr-1.42AXv)
where G is given in ft3 of CH4/day G=5.62(4571-1.42x496.4) =21,727 ft3/day (615 m3/day)
(b) Aerobic process. The new detention time is: The new COD removed:
From the equation:
By rearrangement, the new MLVSS are obtained as
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