EDI Ultrapure Water System for DEF Production in India

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EDI Ultrapure Water System for DEF Production in India

Time: Oct. 2025

Projects: Diesel Exhaust Fluid (DEF) production

Water Quality Output: 18 MΩ·cm ultrapure water

Background

The diesel exhaust fluid (DEF) is a colorless, non-toxic, transparent solution consisting of 32.5% high-purity urea and 67.5% ultrapure water.

In diesel engines equipped with selective catalytic reduction (SCR) systems, DEF is injected into the exhaust gas to react with nitrogen oxides (NOx), effectively reducing emissions to meet stringent environmental standards such as EPA Tier 3 and EURO VI/VII.

Although the formulation of DEF appears simple, the purity requirements for the water are extremely stringent. Even trace amounts of metal ions, chloride ions, or silica impurities can lead to crystallization, nozzle corrosion, or catalyst deactivation, which may cause SCR system failure or emission exceedances.

Therefore, the stability and purity of ultrapure water directly determine the performance of DEF products and the reliability of the system.

A worker is filling diesel exhaust fluid into the vehicle's filling port.

Project Description

To ensure long-term product stability and continuous production, a leading DEF manufacturer in India partnered with SNOWATE to comprehensively upgrade their water treatment system.

The new production line employs a combined RO (Reverse Osmosis) and EDI (Electrodeionization) process, achieving multi-stage purification from raw water to ultrapure water.

The complete preparation process is as follows:

Raw water pretreatment ⇨ Primary & secondary RO ⇨ EDI system ⇨ Ultrapure water storage ⇨ Pre-mixing & heat exchange ⇨ Homogenization ⇨ Filtration & purification ⇨ Storage & filling.

A dedicated EDI ultrapure water system for automotive urea production

In this process, the RO system removes most dissolved salts and organic contaminants, while the terminal EDI ultrapure water system further refines the water, stabilizing the outlet resistivity at 18 MΩ·cm, substantially exceeding the ISO 22241 standard requirements for DEF production water.

To meet this requirement, SNOWATE offers a new generation EDI ultrapure water system specifically designed for continuous industrial operation, achieving a balance between low energy consumption and high reliability to ensure long-term stable production of high-quality ultrapure water.

Multiple EDI ultrapure water systems are neatly arranged in the workshop for continuous production of high-purity water.

System Configuration

Each EDI module incorporates internationally advanced components to guarantee superior electrochemical stability and long-term operational reliability:

Pure platinum-plated titanium anode
High-performance acid-resistant ion exchange membranes
DOW specially formulated mixed-bed resin (DOW Resin)

These core components guarantee the equipment’s long-term stable production of high-purity water under continuous industrial operating conditions.

Core Components of the EDI (Electrodeionization) Module

Design Highlights

Repeatable Chemical Cleaning: Stable performance without degradation.
Stable Ultrapure Water Output: Continuous water resistivity exceeding 18 MΩ·cm.
Long Service Life: 5–8 years of stable operation with extended maintenance intervals.
Energy Efficient: Energy consumption significantly lower than conventional mixed-bed systems.
Intelligent Control System: Real-time monitoring and automatic adjustments to ensure consistent water quality.
Proprietary Technology Advantages: Utilization of independently developed ion-exchange membranes and control algorithms.

Feedback

After several months of operation, the customer reported the following outcomes:

No crystallization detected in automotive urea piping
Consistent NOx conversion efficiency in the SCR system.
Significant reduction in downtime and maintenance frequency.
Marked decrease in energy consumption and consumable costs.

The customer highly appreciates our team's professional design and equipment performance and intends to continue implementing our EDI ultrapure water system in future new production line expansion projects.