BioSpikes 1000 lower sludge levels at a paper mill without the need for dredging

The application of Novozymes’ BioSpikes 1000 to a paper mill increased treatment capacity by 41%, by lowering sludge levels without dredging.

Benefits

  • 0.19 m (0.6 ft.) reduction in sludge level
  • 41% increase in treatment capacity

Background

A South-East fiber mill needed to increase treatment capacity in its wastewater treatment lagoon. The mill discharges into a tidal zone, and the water level averaged 0.61 m (2 ft.) in depth. The mill owned a dredge for the back end of the treatment lagoon, but they needed to create more treatment capacity toward the front end of the system. The 15-hectare (37-acre) lagoon treated approximately 45,000 m3 per day (12 MGD). The lagoon has a design depth of 3.7 m (12 ft.).

Application

Novozymes treated two areas of the front end of the aerated stabilization basin (ASB) with BioSpikes 1000. There was no record of any previous dredging of this area, and the sludge was thick and compact. An adjacent untreated area was used as a control plot.

Results

Sludge-reduction-levels-from-start-to-60-days
Fig. 1. A consistent sludge level reduction in the two treated areas and an increase in the control plot were observed at the end of the trial period.

Sludge-from-treated-portion-of-the-lagoon
Fig. 2. Shows sludge from a treated portion of the lagoon. The bulk water appears much cleaner, and the floc particles are more compact compared to untreated controls.

Conclusion

  • BioSpikes 1000 reduced sludge levels and increased treatment capacity by 41%
  • Observations of settled sludge samples show biological changes as a result of adding BioSpikes 1000