pitanje je jasno: ne traži se "lamelarni separator" već "lamele separatora"
- lamele/ploče koje su sastavni deo lamelarnog/pločastog taložnika ili separatora
Lamella (jed.), lamellae (mn.)

https://books.google.rs/books?id=sP5Bj3pByTsC&pg=PA282&lpg=P...
THE LAMELLA CLARIFIER
...
Maintenance is limited to monthly testing, and cleaning of the separator plates once every six months.

http://www.metacomm-bih.com/procesna-oprema/plocasti-lamenar...
PLOČASTI LAMELARNI TALOŽNICI
Pločasti (lamelarni) taložnik je separator, koji se primenjuje kao sedimentacioni uređaj za separaciju čvrstih čestica od tečnosti.

separator lamellae:
https://www.google.rs/search?q= separator lamellae&ie=utf-8&...

https://en.m.wikipedia.org/wiki/Lamella_clarifier
A lamella clarifier (inclined-plate clarifier) is designed to remove particulates from liquids. They are often employed in primary water treatment in place of conventional settling tanks. They are used in industrial water treatment. Unlike conventional clarifiers they use a series of inclined plates. These inclined plates provide a large effective settling area for a small footprint .