PuK - Process Technology & Components 2024
A technical trade magazine with a history of more than 60 years.
A technical trade magazine with a history of more than 60 years.
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Compressors/Compressed air/<strong>Components</strong><br />
Companies – Innovations – Products<br />
The pressure downstream of the Iris ® <strong>Process</strong> Control Valves can be<br />
read from the graphs of this SCADA print out shown in Fig. 3. This information<br />
is helpful to identify any need for maintenance of the diffusors.<br />
The Iris ® valves have been working for over 10 years to full satisfaction.<br />
Fig. 1: Egger Iris ® diaphragm control valve for precise air control at the biology of<br />
the Stendal wastewater treatment plant<br />
Besides the significant energy savings due to the lowered DO set point,<br />
the oxygen transfer could be improved. In addition, the diffusers can<br />
be flushed more effectively because of to the higher flow capacity of<br />
the Egger Iris ® valves compared to the former butterfly valves.<br />
Fig. 3: Achieved oxygen content in aeration tank lines 1 and 2 with downstream<br />
pressure of the valves, printout from the process control system at Stendal WWTP<br />
Emile Egger & Cie SA<br />
Route de Neuchâtel 36<br />
2088 Cressier NE, Switzerland<br />
Phone +41 (0)32 758 71 11<br />
info@eggerpumps.com<br />
www.eggerpumps.com<br />
Bredel NR Transfer pump hose<br />
launched for general fluid transfer<br />
applications<br />
Fig. 2: Iris ® Diaphragm Control Valve DN 100 with Auma drive at the Stendal<br />
sewage treatment plant<br />
Optimization of process control technology<br />
The programming of the process control system for the activated sludge<br />
air control was carried out by the company S & W Automatisierung<br />
Prozeßleittechnik in cooperation with the Stendal sewage treatment<br />
plant. A constant pressure control and a sliding pressure control were<br />
programmed. The system is designed in such a way that the sewage<br />
treatment plant can switch between the two types of control and adjust<br />
parameters individually. This allows the potential of the system<br />
to be optimally utilized. The oxygen content varies between 1.78 and<br />
1.84 mg/l with a default value of 1.8 mg/l.<br />
There are two control loops for the sliding and constant pressure<br />
control: One is the dissolved oxygen control loop, and the other is the<br />
control loop for the compressors. The compressors receive only one<br />
preset value, which must be maintained.<br />
Bredel hose pumps, which is part of Watson-Marlow Fluid <strong>Technology</strong><br />
Solutions (WMFTS), has expanded its range of pump hoses by releasing<br />
the new and versatile Bredel NR Transfer hose for general fluid<br />
transfer applications at pressures up to 12 bar (174 psi). The Bredel NR<br />
(Natural Rubber) Transfer hose can be used for handling sludge with a<br />
high solid content, food and beverage waste and abrasive slurries. This<br />
solution complements the Bredel NR Metering hose, which is designed<br />
for heavier duties with pressure capability up to 16 bar (232 psi), already<br />
available from Bredel hose pumps.<br />
All Photos: Watson-Marlow Fluid <strong>Technology</strong> Solutions<br />
114 PROCESS TECHNOLOGY & COMPONENTS <strong>2024</strong>
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