system configuration. In particular, the water and solid retention time of the system as well as methods used for water treatment within the recirculating loop are major factors underlying such
heterotrophic bacterial activity. Sludge recoveries as low as 14% of the added feed, much lower than the calculated sludge production (38–46%), were reported for recirculating systems not equipped with dedicated treatment steps for sludge digestion (Chen et al., 1993, 1997). Also Suzuki et al. (2003) found similar low sludge production values of 18% of the added feed in a RAS not equipped with dedicated treatment for sludge removal. Not only organic carbon
but also nitrogen is lost from RAS. The loss of nitrogen is mainly due to denitrification in oxygen depleted zones in the system and may account for as much as 21% of the nitrogen loss in some RAS (reviewed by van Rijn et al., 2006).
system configuration. In particular, the water and solid retention time of the system as well as methods used for water treatment within the recirculating loop are major factors underlying suchheterotrophic bacterial activity. Sludge recoveries as low as 14% of the added feed, much lower than the calculated sludge production (38–46%), were reported for recirculating systems not equipped with dedicated treatment steps for sludge digestion (Chen et al., 1993, 1997). Also Suzuki et al. (2003) found similar low sludge production values of 18% of the added feed in a RAS not equipped with dedicated treatment for sludge removal. Not only organic carbonbut also nitrogen is lost from RAS. The loss of nitrogen is mainly due to denitrification in oxygen depleted zones in the system and may account for as much as 21% of the nitrogen loss in some RAS (reviewed by van Rijn et al., 2006).
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