Frequently Asked Questions

A plate settler (lamella clarifier) uses closely spaced inclined plates to multiply the effective settling area within a compact tank. Water flows up between the plates while solids settle onto the plate surfaces and slide down into a collection hopper. Because settling depends on projected (horizontal) area, stacking many inclined plates gives a very large settling area in a small footprint.

Sizing is based on the projected plate area required to keep the surface loading rate within the design range (typically 1.5–3.5 m/h). Divide the design flow by the target surface loading rate to get the required projected area, then select a plate pack and unit that provides it. Our sizing calculator gives a quick first estimate.

Most plate settler applications use a projected-area surface loading rate of 1.5–3.5 m/h. Lighter, slower-settling solids need the lower end of the range; well-flocculated, dense solids can use the higher end. A pilot trial confirms the right value for a specific water.

Plates are typically inclined at 55–60° so settled solids slide off freely, with 50–100 mm spacing between plates. Closer spacing gives more area but needs cleaner water; wider spacing suits higher solids loads.

Plate settlers have no rotating parts in the settling zone, so maintenance is light: routine inspection, periodic plate cleaning, and reliable sludge withdrawal. A structured inspection and cleaning routine keeps a unit at design performance for decades.

It depends on the water. Some units run for months between cleans; others with fouling or scaling tendencies need more frequent attention. Monitoring effluent quality is the best guide — a gradual rise in turbidity signals it is time to clean.

Settled solids slide down the inclined plates into a hopper and are withdrawn by gravity or pump. Withdrawal can be manual, timer-based or controlled by a sludge-blanket sensor. Matching withdrawal to the incoming solids load keeps the blanket low and the effluent clear.

With appropriate coagulation and flocculation, plate settlers routinely achieve 90–95%+ removal of suspended solids. Actual performance depends on particle characteristics, chemical conditioning and surface loading rate.

Plate settlers suit almost any solid–liquid separation duty: municipal water and wastewater, industrial effluent, food and beverage, metal finishing, mining, and stormwater or construction dewatering. They are especially valuable where footprint is limited.

Yes. For the same flow, a plate settler needs a fraction of the footprint of a conventional clarifier — often around 80% less. They can be installed as new units or retrofitted into existing tanks to increase capacity.

R+F plate settler and lamella systems are manufactured in stainless steel — SS 304 or SS 316L — for corrosion resistance, hygiene and long service life.

Yes. R+F offers rental plate settlers for temporary needs — plant outages, construction dewatering, emergency treatment or pilot evaluation — with the option to move to a permanent purchase later.

Yes. A PSP pilot unit can run on your actual water on site to confirm the achievable surface loading rate, chemical dose and effluent quality before you commit to a full-scale system.

Yes. R+F designs stainless steel lamella packs matched to an existing tank to increase its settling area and capacity, reusing the civil structure and minimising downtime.