Client: Damhusåen WWTP (BIOFOS)
Product: Norfloc NF1 inorganic coagulant based on nanotechnology
Project: Full-scale test with Norfloc on line A.
Results: Better / faster settling, Higher SS, Less foam, more stable operation – also during heavy rain events, increased plant capacity, less chemical sludge.
Norlex Chemicals has, in collaboration with Biofos, performed a fullscale testing with Norfloc NF1 on one of Damhusåen WWTP 4 lines, line A, where line B, C and D were used as a comparison basis.
SVI (SLUDGE VOLUME INDEX)
Higher SS in return sludge
- Before treatment started: average 7 kg/m3
- After treatment with Norfloc NF1: average 13 kg/m3
With Norfloc NF1: Line A bioreactors 07.05 (notice the tank without aeration has foam)
Without Norfloc NF1: Line B bioreactors 07.05 (notice the tank without aeration still has dense foam)
Hydraulics – Sludge blanket during heavy rain events
More stable operating conditions – also during heavy rain events
Flow event at 10.000 m3/h
Sludge blanket for lines with Norfloc NF1 versus line with ferric chloride during heavy rain events.
The graph shows clearly that the sludge levels for line A with Norfloc NF1 (blue) are kept much more stable compared to lines with ferric chloride (orange), where sludge levels rise above 200 cm and result in sludge escape (bulking) from the clarification to the outlet and restriction in the flow to the biology (incoming water partly directed to reservoirs).
If ongoing rain, this will lead to a bypass situation when reservoirs are full.