S-Select® - References for the revolution in the sludge settlability

 
 
WWTP Glarnerland was struggling with poor sludge settlability since its inception. In addition, a 30% load increase must now be coped with. Instead of expanding the plant from 4 to 6 process trains, the extension could be foregone and 2 of the existing trains were taken out of operation.



Strassen
Strassen
 
Sludge settleability has improved dramatically. Settling rates of 4 - 5 m/h are now being achieved. All this; even while substantial growth of filamentous organisms (predominantly Microthrix parvicella) was observed after introducing MIMICS®. In the secondary clarifiers, granules and filaments form a perfect flock filtration which warrants suspensor concentrations of 2-3 mg/l and quickly settles (4 - 5 m/h).
Glarnerland copy
Glarnerland copy
 

Treatment Plant B. in Hesse (Germany)

 
The sedimentation of activated sludge is substantially improved by S-Select® at this 32,000 PE plant. This allows for operating at much higher concentrations of activated sludge and resulting from this a decommissioning of one process basin.
Moreover, the control of the aeration regime and quantification of to be removed surplus sludge (WAS) is carried out by S-Control®.

Glarnerland copy
Glarnerland copy
 

WWTP S. (Germany)

 
The city of S. operates this WWTP in North Rhine-Westphalia with a design capacity of 175.000 PE and utilizes the conventional activated sludge process.
With regard to a planned expansion of the plant capacity different options, particularly in the secondary clarification, were investigated. In conclusion, it was decided to implement the S-Select® process instead of constructing an additional sedimentation tank with a diameter of 52 m.

In addition to the dramatic savings in investments the following arguments were decisive:
• Significantly better sludge settling, even under bulking sludge growth conditions; faster settling of the sludge, good clear water discharge, significantly higher TS concentration in the aeration tank without the risk of sludge loss.
• Therefore significant increase in biological productivity
• No interruption or impairment of operation due to construction
• Short-term implementation
• No changes in operation

Glarnerland copy
Glarnerland copy
 

WWTP B. in Rhineland-Palatinate (Germany)

 
WWTP B. is dimensioned for 45,000 PE and can treat up to 25,000 m3 of wastewater daily. The biological removal stage consists of the aeration tanks with a total of 7000m³, the 3 round settling tanks, and the return sludge pumping station.

S-Select® is implemented by feeding the selector via a feed pump with return activated sludge (RAS) withdrawn from the return sludge pit. In the Selector, the separation of the light and the heavy sludge fraction is achieved. The fast settling sludge is returned to the return sludge line, the light sludge fraction is forwarded to thickening.

Overall, the removal capacity of WWTP B. is significantly expanded. Instead of the usual term "sludge volume index", now the term "sludge sedimentation rate" signifies the controlling parameter.







IMG_0170
IMG_0170
 
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