In the first exchange, aeration and agitation were shut down, sludge was left to sediment for 30 min and half the supernatant (130 mL) was replaced by a new feed with COD of 1000 mg/L, so as to simulate a recycle ratio equal to 1 (one)
In the firstexchange, aeration and agitation were shut down, sludge was leftto sediment for 30 min and half the supernatant (130 mL) wasreplaced by a new feed with COD of 1000 mg/L, so as to simulate arecycle ratio equal to 1 (one)