DTRO Modules & Replacement Cushions (120 Bar)

// MODULE-02 / PROCUREMENT STRATEGY

The CapEx Killer.
Cushion Replacement Strategy.

Original European DTRO modules are prohibitively expensive. As a direct-source integrator, we offer two distinct procurement tracks to drastically reduce your landfill leachate OPEX.

Track 1: Full Module

Complete WANDONG Modules

For new plant construction or replacing severely damaged housings. You receive a fully assembled, factory-tested DTRO module (FRP/SUS housing, flanges, discs, and cushions). 100% dimensionally identical to Rochem PF and Pall DT modules. Plug and play.

75 BAR 90 BAR 120 BAR

Track 2: Save 70% CapEx

Cushion Replacement Kits

Why throw away a perfectly good stainless steel housing and ABS discs? We supply the exact octagonal membrane cushions and O-ring kits. Your field engineers simply open the module, slide in our OEM cushions, and restore 100% performance at a fraction of the cost.

209 Cushions per Kit

// MODULE-03 / SPECIFICATION MATRIX

Universal DT Compatibility.

Standardized testing conditions per ASTM D4516. Data represents typical values for WANDONG OEM equivalents.

WANDONG Nomenclature

WD

+

DTRO

+

90

Drop-In Replacement Targets

DATA SOURCE: OEM TECHNICAL BULLETINS

Application Class	Rochem® Target	Pall® Target	WANDONG OEM Equivalent
Standard Leachate (Medium Pressure) 75 Bar / 9.4 m²	PF Module (75 bar)	DTGE-MP (75 bar)	WD-DTRO-75 MATCH
High Concentration Leachate 90 Bar / 9.4 m²	PF Module (90 bar)	DTGE-MP (90 bar)	WD-DTRO-90 MATCH
ZLD / Extreme Osmotic Pressure 120 Bar / 9.4 m²	PF Module (120 bar)	DTGE-HP (120 bar)	WD-DTRO-120 MATCH

WANDONG OEM Verified Parameters

Model	Active Area m²	Cushion Qty	Permeate Flow (L/h)	Nominal Rejection	Max Op. Pressure (Bar)
WD-DTRO-75	9.4	209	250 - 350	99.0%	75 (1088 psi)
WD-DTRO-90	9.4	209	250 - 350	99.0%	90 (1305 psi)
WD-DTRO-120	9.4	209	200 - 300	99.0%	120 (1740 psi)

* Test Conditions: 32,000 mg/L NaCl, 800 PSI, 25°C.
* Performance Disclaimer: Flow rates are indicative. In leachate treatment, average output per module is roughly 3 m³/day depending on feed conductivity and osmotic pressure.

Process Engineer's Note: Osmotic Pressure Limits

Unlike standard RO, DTRO recovery rates in landfill leachate are strictly dictated by osmotic pressure rather than fouling. As permeate is extracted, brine concentration spikes exponentially. System design must ensure the final concentrate's osmotic pressure never exceeds the module's 120-bar mechanical limit to prevent zero-flux conditions.

// MODULE-04 / MECHANICAL COMPATIBILITY

Precision Engineered.

WANDONG DTRO modules are manufactured to precise European dimensional standards. Whether you are replacing a single module or retrofitting an entire containerized plant, our hardware aligns perfectly with your existing high-pressure manifolds.

Physical Specifications

Module Wet Weight

~80 - 100 kg (Depends on Bar)

Pressure Vessel Material

FRP / Stainless Steel (120 Bar)

Feed / Brine Connections

12 mm (Swagelok)

Permeate Connection

9 mm (Hose)

1400mm Overall Length

214mm Outer Diameter

209pcs Cushions Inside

DTRO MODULE

L: 1400 mm

OD: 214 mm

// MODULE-05 / ENGINEERING ANATOMY

Deconstructing the Open Channel.

Why does a standard spiral wound RO membrane fail in landfill leachate within hours, while DTRO runs for years? The secret lies in the patented Disc Tube architecture.

3D Exploded View of DTRO Module Discs and Cushions

Disc Tube Architecture

1. Open Channel Dynamics (No Mesh)

Unlike spiral wound membranes that use a tight plastic mesh (spacer) which traps solids, DTRO utilizes a 2.0 mm open channel. Suspended solids and biomass simply cannot be trapped, allowing it to handle SDI levels up to 15.

2. ABS Hydraulic Deflector Discs

Molded ABS spacing discs separate the membrane cushions. Their patented surface geometry forces the feed water into a highly turbulent, 180-degree reversing flow path. This extreme turbulence constantly scours the membrane surface, providing a self-cleaning effect that prevents scaling.

3. Octagonal Membrane Cushions

Formed from two layers of polyamide membrane ultrasonically welded around the periphery. The octagonal shape prevents dead zones where stagnant water could breed bacteria. Pure permeate collects inside the cushion and flows to the central rod.

4. SUS316L Central Tension Rod

The entire stack of 209 cushions and discs is strung onto a heavy-duty stainless steel central rod and compressed by metal end-flanges. This robust mechanical assembly is what allows the module to withstand a terrifying 120 bar (1740 psi) of hydraulic pressure without rupturing.

// MODULE-06 / OPERATING LIMITS

Extreme Tolerance.

Designed for the worst water on earth. Strict adherence to these parameters ensures optimal performance and validates the warranty.

Maximum Operating Temperature	104°F (40°C)
Maximum Operating Pressure	75 / 90 / 120 bar
Max Pressure Drop (Single Module)	9 bar
pH Range, Continuous Operation	6 - 9
pH Range, Chemical Cleaning (@40°C)	2 - 11
Feed Flow Rate Range	500 - 1200 L/h
Maximum Feed Silt Density Index (SDI)	SDI 15 (Open Channel)
Free Chlorine Tolerance	< 0.1 ppm

General Handling & Preservation

Modules are shipped wet, preserved in a 1.0% SMBS solution.
In freezing conditions, 10% Propylene Glycol is added to the preservative.
Keep elements moist at all times after initial wetting.

System Startup Protocol

Due to the extreme pressures involved, strict adherence to the startup sequence is mandatory:

1. Low Pressure Flush: Flush the module at low pressure for 15-25 minutes to remove preservative.
2. High Pressure Flush: Increase pressure gradually and flush for 60-90 minutes.
3. Permeate and concentrate obtained from the first hour of operation must be discarded.

// MODULE-08 / SELECTION GUIDE

Application-Based Selection.

DTRO is not selected by TDS. It is selected based on the extreme osmotic pressure and fouling potential of your specific wastewater stream.

75 BAR Medium Press.

Fresh Landfill Leachate

Standard DTRO Series

Designed for standard municipal landfill leachate where osmotic pressure is manageable but organic fouling (COD) is extremely high.

High-Concentration Series

Engineered for aged landfill leachate and acting as the second stage in a two-pass DTRO system to ensure strict discharge compliance.

Heavy-Duty Application

120 BAR Extreme Press.

ZLD / Brine Concentration

Extreme Pressure Series

The ultimate ZLD pre-concentrator. Pushes brine to the absolute osmotic limit before thermal evaporation, saving massive thermal energy CapEx.

Currently Viewing

// MODULE-09 / APPLICATION SCENARIOS

The Last Line of Defense.

When conventional biological treatment and spiral wound RO fail, DTRO is the only technology capable of reducing almost all parameters (COD, BOD, Heavy Metals, Salts) in a single step.

Landfill Leachate

Treating highly toxic, non-biodegradable "Hard COD" directly from municipal landfills.

Industrial ZLD Evaporator Pre-Concentration DTRO System

ZLD Pre-Concentration

Using 120 bar pressure to hyper-concentrate brine before thermal evaporation, saving massive thermal energy.

Electroplating Waste

Concentration of waste streams for valuable heavy metal recovery.

Pharmaceutical Chemical Plant Wastewater DTRO

Pharma & Distillery

Reducing COD from 50,000 ppm down to <250 ppm in a single robust treatment step.

// MODULE-10 / FACTORY & INVENTORY

Precision Manufacturing.

Manufacturing DTRO cushions requires extreme precision in ultrasonic welding. WANDONG ENVIRO operates automated robotic welding lines to ensure every octagonal cushion can withstand 120 bar of pressure without delamination.

Automated Ultrasonic Welding

100% Pressure Tested Modules

Global Air-Freight for Cushion Kits

Ultrasonic Welding for DTRO Octagonal Cushions

Massive Warehouse Inventory of DTRO Membrane Cushions

Manual Assembly of DTRO Module on Tension Rod

// MODULE-11 / PROVEN IN THE FIELD

Powered by WANDONG.

We don't just sell components; we build the heavy-duty systems that rely on them. Our DTRO modules are the beating heart of our own containerized Landfill Leachate plants deployed globally.

The Integrator's Advantage

Because we use these exact modules in our own EPC projects, they undergo rigorous internal quality control that pure trading companies simply cannot match. We stake our entire plant's performance on these elements.

Containerized DTRO Plant for Landfill Leachate Treatment

FIELD DEPLOYMENT

WANDONG Containerized DTRO Plant

Showcasing the vertical DTRO modules installed in our skids.

// MODULE-12 / THE ENGINEER'S UNBOXING

Engineered for Field Maintenance.

Whether you order a complete 80kg module or a cushion replacement kit, we deliver a risk-free deployment experience engineered for remote landfill sites.

Complete Rebuild Kits

Ordering cushions? We don't just send the membranes. Every cushion kit includes the complete set of required O-rings and lip seals to ensure a perfect, leak-free rebuild of your existing housing.

Torque Specs & Guides

Reassembling a DTRO module requires precise tensioning of the central rod. We include hardcopy QC certificates and step-by-step torque specifications right in the box. No guessing for your field team.

Export-Grade Crating

Complete modules weigh up to 100kg. They are vacuum-sealed in moisture-barrier foil with SMBS preservative and secured in heavy-duty, fumigated wooden crates engineered to survive harsh global sea-freight.

// MODULE-13 / LOGISTICS MATRIX

Heavy-Duty Export Crating.

DTRO modules are heavy industrial equipment. We utilize fumigated wooden crates optimized for both rapid air-freight and secure sea-freight.

Complete DTRO Module

WOODEN CRATE

Dimensions (L×W×H)

~1500 × 300 × 300 mm

Gross Weight

~110.0 kg (242 lbs)

Net Weight

~85.0 kg (187 lbs)

Volumetric Weight

~27.0 kg (Air-Freight)

* Values are approximations for a 90-bar module including heavy-duty export crating.

Cushion Replacement Kit

~35 kg

Includes 209 octagonal cushions + full O-ring set. Carton packed for fast air-freight.

Project Bulk Order

Custom

Modules are securely strapped to heavy-duty pallets for 20ft/40ft FCL EPC shipments.

// MODULE-14 / GLOBAL O&M SUPPORT

Direct Access to Senior Process Engineers.

Rebuilding a DTRO module for the first time? Our clients get direct WhatsApp and video-call access to our senior engineers for step-by-step assembly guidance and high-pressure startup protocols.

Assembly Video Guides Torque Specifications 24/7 Standby

Chat with Engineer Email Support Desk

// MODULE-15 / TECHNICAL FAQ & WARRANTY

Hardcore FAQ.
Engineering-Grade Answers.

Can I really just replace the cushions instead of the whole module?

Absolutely. This is the biggest secret in the DTRO industry.

The FRP/Stainless Steel housing and the ABS hydraulic discs do not degrade. Only the polyamide membrane cushions foul over time. By ordering our Cushion Replacement Kit (which includes 209 cushions and all necessary O-rings), your engineers can rebuild the module on-site. This strategy slashes your CapEx by up to 70% compared to buying a complete new module from European OEMs.

Are your cushions compatible with Rochem® and Pall® systems?

Yes. Our DTRO modules and cushions are manufactured to exact dimensional tolerances. They are 100% drop-in replacements for standard Rochem PF modules and Pall DT modules. The cushions will fit perfectly onto your existing tension rods and hydraulic discs.

Why choose DTRO over standard Spiral Wound (8040) RO?

Standard 8040 spiral wound membranes use a tight plastic mesh (spacer) that instantly clogs when exposed to high suspended solids. They require SDI < 5.

DTRO uses an Open Channel (2.0mm) design without any mesh. It can handle SDI up to 15, massive COD levels, and extreme osmotic pressures (up to 120 bar), making it the only viable choice for raw landfill leachate and ZLD concentration.

What is your warranty policy?

We provide a strict 12-Month Limited Warranty against manufacturing defects (such as ultrasonic weld failure on the cushions). The warranty is voided if failure is caused by exposure to oxidative chemicals (Free Chlorine > 0.1ppm) or operation beyond the specified maximum pressure (e.g., running a 90 bar module at 120 bar).

How long do the membrane cushions last in raw landfill leachate?

In typical fresh landfill leachate applications with proper sand filtration and regular CIP cleaning, WANDONG DTRO cushions generally last 2 to 3 years before requiring replacement due to irreversible organic fouling and flux decay.

Do you supply the special torque tools required for module reassembly?

Yes. Proper tensioning of the central rod is critical to prevent leaks at 120 bar. If your field team does not have the required tools, we can supply the exact hydraulic tensioning tools, torque wrenches, and step-by-step manuals along with your cushion replacement kit.

// MODULE-16 / INITIATE PROTOCOL

YOUR 50,000m²
OEM SUPPLY BACKEND.

Stop paying massive premiums for European DTRO replacements. Whether you need complete 120-bar modules or just the cushion rebuild kits, our engineers will provide a precise drop-in replacement proposal within 1 hour.

1h

INITIAL RESPONSE

1-ON-1

CUSTOM PROPOSAL

$0

CONSULTATION FEE

// SECURE YOUR SUPPLY CHAIN

Request Dispatch & Pricing

Work Email *

WhatsApp / Phone

Target Product *

Quantity *

Raw Water Report or Old Specs (Optional)

DROP FILE OR CLICK

.PDF / .XLSX / .CSV / MAX 10MB

Notes & Destination Zip Code

Not sure if you need 90 bar or 120 bar? Attach your leachate water report, and our engineers will calculate the exact osmotic pressure for you.

AVG. RESPONSE: < 4 HRS · NDA AVAILABLE ON REQUEST

Conquer Leachate. DTRO Modules.

The CapEx Killer.Cushion Replacement Strategy.