B3-KV26-B onwards For details on the shafts see Chapter Bevel-helical gearbox B3

Flender/Flender Gear Units/Bevel-helical gearbox B3

s of coarse and fine screens, vortex degritters and flow measurement. Screenings are wa shed and compacted in screenings press prior to discharge into containers which are carried away for di sposal. Grit is separated in grit classifier and deposited in bins which are also carried away for disposal. The degritted wastewater flows into channel where the combined flow is measured by an ultrasonic flow meter and then flows into th main division box which splits th flow to Module 1 and 2 PSTs. 4.2.2 Primary Treatment Degritted wastewater to Module 1 gravitates into the PST splitter box where it is spilt between 4x2m diameter PSTs. Module 2 degritted wastewater is split between 3x 2m diameter PSTs. Prior to commissioning of the new sludge treatment fa cility in October 2, the PSTs were operated on rotating four day sludge storage/discharge cycle. For three days PST accumulates primary sludge. On the fourth day the fermented sludge is pumped to the balancing tank. The fermented sludge can also be pumped directly to the activated sludge bioreactors. This mode of operation stimulates the formation of volatile fatty acids (VFAs) which supplement organic carbon required for optimal nutrient removal in the downstream BNR activated sludge process. With the commissioning of the new sludge treatmen facility, primary sludge is now pumped to 2 fermenters where it is fermented and generates VFA rich elutriant which is returned to the activated sludge process. Fermented sludge is pumped to the 2 anaerobic digesters for co-digestion with waste activated sludge (WAS). The PST overflow gravitates to the Balancing Tanks. 4.2.3 Balancing Tanks Each module has its own balancing tank fitted with submersible mixers to keep any remaining solids in suspension. The volumes for Module 1 and 2 Balancing tanks are 1,1 and 1,0 3 respectively. The outflow from the Balancing Tanks is controlled to pre-set flow. magnetic flow meter measures the flow and