Sector experience Paper and pulp
Media experience Wastewater / effluent
Services provided Design
Installation
Commissioning
 
 

Holmen Paper, Madrid produces newsprint from wastepaper. In 2001, the mill had to improve their wastewater treatment process before discharge to a municipal sewer.

Holmen chose SCBP treatment technology. The process consisted of two 1250m3 SCBP bioreactors in series, followed by a microflotation unit. Carrier filling degree inside the bioreactors was 40%. Treatment results were excellent and three weeks after the start-up, all guarantee values were achieved.

In 2006, Holmen started a new paper machine, almost tripling production capacity to 470,000t/a. This meant that the capacity of the wastewater treatment plant had to be increased. Two new 1500m3 SCBP bioreactors with 20% carrier filling degree and a new microflotation unit were built. The new process was operated in parallel lines with the older reactors.

Today, the average flow to the treatment plant is approximately 8500m3/d. The average inlet COD and BOD5 concentrations are 2590 and 1180mg/l, respectively. This means that the average volumetric loads over the whole process are 4.0kgCOD/m3/d and 1.8 kgBOD/m3/d. Daily maximum volumetric loads are 6.2kgCOD/m3/d and 2.8kgBOD/m3/d. Outlet average concentrations of COD, BOD5, and SS after the microflotation units are 400, 70 and 25ppm, respectively. Treated water is led to municipal sewer.


Holmen Paper, Madrid produces newsprint from wastepaper. In 2001, the mill had to improve their wastewater treatment process before discharge to a municipal sewer.

Holmen chose SCBP treatment technology. The process consisted of two 1250m3 SCBP bioreactors in series, followed by a microflotation unit. Carrier filling degree inside the bioreactors was 40%. Treatment results were excellent and three weeks after the start-up, all guarantee values were achieved.

In 2006, Holmen started a new paper machine, almost tripling production capacity to 470,000t/a. This meant that the capacity of the wastewater treatment plant had to be increased. Two new 1500m3 SCBP bioreactors with 20% carrier filling degree and a new microflotation unit were built. The new process was operated in parallel lines with the older reactors.

Today, the average flow to the treatment plant is approximately 8500m3/d. The average inlet COD and BOD5 concentrations are 2590 and 1180mg/l, respectively. This means that the average volumetric loads over the whole process are 4.0kgCOD/m3/d and 1.8 kgBOD/m3/d. Daily maximum volumetric loads are 6.2kgCOD/m3/d and 2.8kgBOD/m3/d. Outlet average concentrations of COD, BOD5, and SS after the microflotation units are 400, 70 and 25ppm, respectively. Treated water is led to municipal sewer.