FREQUENTLY ASKED QUESTIONS
We get asked a lot of questions about water and wastewater treatment, mass transfer and cooling tower components. Here are the most popular.
You did not find an answer to your question? Please contact us per mail at firstname.lastname@example.org or by phone: +49 2233 39828 0. We are happy to help.
Answer: Our many years of experience as manufacturer of cooling tower installations show that many users are not aware of the possibility of using PP instead of PVC as a material for fills and drift eliminators. In as early as the 1980s, however, we found a good alternative in PP. Many of our customers have used it successfully in cooling towers for decades. After polyethylene, PP is the second most commonly used plastic.
Our brochure presents the properties of the two polymers and offers a better understanding of PP as an alternative to PVC: Brochure PROPERTIES OF POLYMERS PP AND PVC
Although this brochure mainly focuses on cooling towers, certain aspects are interesting for water and wastewater applications as well. Have a look!
Answer: We recommend inclining against the flow direction for 3 important reasons:
- When installing the lamellas against the flow direction, the size of the influent zone is larger, which improves calming of the flow and reducing the flow velocities.
- Any preferred flow currents are deflected from the lamella inclination and the sludge particles directly hit the lamellas. Thus, they settle and slide down the lamellas.
In installations in flow direction, the particles enter the lamella channels without any resistance, which may result in sludge passing the channels without settling on the surface. This would mean there is only little or no sedimentation of the sludge.
- Descending sludge from the lamellas is rather taken away from the lamellas than pushed back into them.
Looking at typical designs of lamella settlers around the world, we find that the majority follows this idea.
Unfortunately, no general statement can be made in this regard. It depends on the individual situation and a variety of factors:
- When you intend to use lamella plates in order to have a low footprint clarifier, for example, the square tank will make it more cost effective since lamella modules, launders and a support structure can be installed more easily.
- To reach more capacity of existing round clarifiers our lamella modules will also be more cost effective than building new clarifiers.
Please contact us for more information in regards to your specific situation!