Open stainless steel belt filter press holding dark dewatered sludge

Representative photo. Your order is made to your specification by a verified seller. Photo: “Belt filter press - Blue Plains WWTP - 2016” by Moreau1, Public domain.

Sludge dewatering supplier in Bangladesh

Roptan is your sludge dewatering supplier in Bangladesh. Tell us your daily sludge volume and where it comes from: we source a filter press, membrane press or centrifuge package from verified sellers, check the trial result and deliver it.

Verified sellers
Checked before it ships
Delivered by Roptan

Prefer to deal with suppliers yourself? Post it on the requirement board

Buying sludge dewatering in Bangladesh

Sludge dewatering turns the wet sludge from an ETP into a cake that can be stored and taken away. Chemical stages leave floc carrying coagulant and dye, biological stages leave surplus biomass, and ZLD plants leave precipitated salts, so each needs a press or centrifuge at the end. Dyeing, washing and printing units in Bangladesh buy one with a new ETP or add one to an existing plant.

A sludge dewatering supplier in Bangladesh should prove the machine on your sludge, not on a brochure figure. Roptan sends your sludge volume and type to verified sellers, asks each for a trial with a stated polymer and a measured cake result, compares the offers and arranges installation through the seller you choose.

Kinds of sludge dewatering machine

Plate and frame filter press

Sludge is pumped into chambers between plates, the liquid passes through filter cloths and the cake stays behind. It is a batch machine that stops to discharge. Choose it where an operator can run cycles.

Membrane filter press

Plates carry an inflatable membrane that squeezes the cake after filling, which has a large effect on dryness. Choose it where drier cake is worth the extra plates and controls.

Decanter centrifuge

A continuous machine that spins solids out of the liquid; its differential speed sets how dry the solids leave. Choose it for large, steady sludge volumes, after a trial on your sludge.

Belt filter press

Sludge rides on a cloth belt: the filtrate drains by gravity first, then the belt passes between rollers that squeeze out more. Judge it, and any screw press offered, only on cake measured from a trial on your own sludge.

How to specify sludge dewatering

Sludge quantity and type: State the volume per day and whether it is chemical, biological or mixed sludge. A package sized only on biological sludge is usually too small once a chemical stage is added.
Conditioning: Polymer is added to release more water before the cake forms. Specify the press, the polymer make-up and dosing unit, the feed pump and the holding tank as one package.
Cake result: Ask for cake dry solids on a stated basis, measured on your sludge with the polymer named. Published sewage sludge cakes run roughly 14 to 25 percent dry solids; textile sludge differs.
Filtrate: Ask how clear the filtrate will be and where it returns in the ETP, and that the plant can take it.
Cake handling and store: Include the conveyor or bunker that takes the cake from the machine, and a covered store on a hard base.
Sludge analysis: Textile wastewater can carry chromium, sulphide, phenols and oil, and industrial sludge can hold cadmium, lead or mercury. Base handling on an analysis of your sludge.

Rules and references for ETP sludge

DoE clearance conditions: Handle and dispose of sludge as the Department of Environment and your Environmental Clearance Certificate require; your clearance conditions, under the Environment Conservation Rules 2023, are the place to start.
ZDHC Wastewater Guidelines: A brand programme, not law: sludge is classified as hazardous or not under local law and handed to licensed haulers. Version 2.0 added sludge disposal pathways.
EN 12255-8:2024: The European design standard for sludge treatment and storage. Not required in Bangladesh, but you can ask which clauses the design follows.

What moves the price of sludge dewatering

Sludge quantity and type, which set plate size and number or centrifuge capacity.
Plain plates against membrane plates.
Automatic plate shifting and cloth washing against manual operation.
Polymer dosing and mixing, the feed pump and the sludge tank.
The cake conveyor or bunker and the covered store.
Running cost: cloth life, spare plates and polymer.

Lead times and delivery

No fixed lead time applies. Machine size, whether the press or centrifuge is imported, a trial on your sludge before ordering, and civil work for the feed tank and covered store move the date. A trial adds time at the start but avoids buying the wrong machine. Roptan confirms the dates in the quote.

We deliver the press or centrifuge, polymer unit, feed pump and panel to your ETP anywhere in Bangladesh and arrange installation and commissioning through the seller. Handover should include the trial and commissioning cake results, the polymer dosing setting, spare cloths, operating instructions and a VAT invoice (Mushak 6.3).

What we check for this order

Trial on your sludgeWe ask for a dewatering trial on your own sludge with the stated polymer before the machine is chosen.
Cake measured on a stated basisWe check the cake result is measured dry solids on a basis named in the quote, so offers compare fairly.
Filtrate returnWe confirm where the filtrate goes back in the ETP and that the plant was sized for it.
Store and licensed haulerWe check a covered store is in scope and that a licensed hauler is named for the cake.

Questions buyers ask

Filter press or centrifuge for ETP sludge?

A filter press works in batches and must stop to discharge, so it suits sites where an operator runs cycles. A decanter centrifuge runs continuously. Which gives the better cake, and how much polymer each needs, depends on your sludge, so ask both sellers for a trial on a sample.

Is ETP sludge hazardous waste?

It may be. Textile effluent can carry chromium, sulphide and phenols, and industrial sludge can hold heavy metals. Have the sludge analysed, classify it under local law and your clearance conditions, store the cake covered on a hard base, and use a licensed hauler.

Why does dewatering need polymer?

Polymer conditions the sludge so that more water separates before the cake forms. Without it most machines give wetter cake. The right polymer and dose come from a trial, so make the polymer unit part of the package, not an afterthought.

We are adding a chemical stage. Does the press change?

Usually, yes. Chemical stages produce coagulant floc as well as the biological sludge you have now, so the daily volume and the way it dewaters both change. Have the seller check the existing press against the new sludge before the chemical stage is ordered.

Does a ZLD plant need dewatering too?

Yes. ZLD plants leave precipitated salts, which are removed and dewatered with a filter press or a centrifuge, and ZDHC treats ZLD residues as sludge. Size the machine and the store for both streams.

How soon will I hear back about ETP plant?

Within 48 hours of a complete requirement, with a price and a delivery date. A requirement is complete when it has the capacity, where it is needed and by when.

Who do I deal with?

With Roptan, when Roptan manages the order: we buy from the verified seller and deliver to you. With the supplier directly, when you post on the requirement board and choose a quote yourself.