F/M is the key parameter for operating any biological treatment. Hence if the F (food as kg/d BOD or COD) drops then also the M (micro-organisms as kg VS in bioreactor) shall be lowered by wasting more biosludge and vice versa. The minimum F/M depends largely on the operating temperature and can be very low in winter conditions down to about 0.01 kg BOD/d / kg VS at 5°C.
Published by Bruno Peeters, managing director at Model Engineering
F/M is the key parameter for operating any biological treatment. Hence if the F (food as kg/d BOD or COD) drops then also the M (micro-organisms as kg VS in bioreactor) shall be lowered by wasting more biosludge and vice versa.
The minimum F/M depends largely on the operating temperature and can be very low in winter conditions down to about 0.01 kg BOD/d / kg VS at 5°C.