Ultrapure Water and ZLD Systems for Power Plants and Heavy Industry
SECTOR 03 · CONTINUOUS OPS

Uninterrupted Water Architecture for
Power & Heavy Industry.

When a boiler trips, millions are lost. We engineer double-redundant, skid-mounted Ultrapure Water (UPW) and Zero Liquid Discharge (ZLD) systems designed for absolute 24/7 reliability.

EDI Ultrapure Water
ZLD / Water Reuse
N+1 Redundancy
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System Technical Specifications

Engineering Data Sheet
Capacity Range
10 - 1,000 m³/h
Scalable multi-train architecture.
Max Purity (UPW)
18.2 MΩ·cm
Silica < 10 ppb (Double-Pass + EDI).
System Reliability
N+1 Hot Standby
Dual pumps & redundant logic.
Control System
Siemens S7
Full DCS integration (Modbus/Profibus).

One Plant. Three Critical Water Streams.

We architect the complete, closed-loop water cycle for your manufacturing facility.

STREAM 01 / PROCESS

Boiler Make-up Water

Producing 18 MΩ·cm ultrapure water to prevent scaling and corrosion in high-pressure steam turbines.

Solution: Double-Pass RO + EDI
STREAM 02 / REUSE

Cooling Tower Blowdown

Recovering high-TDS blowdown water back into the cooling cycle to drastically reduce municipal water intake.

Solution: UF + Fouling-Resistant RO
STREAM 03 / DISCHARGE

Zero Liquid Discharge (ZLD)

Concentrating industrial effluent to its absolute limit, preparing the brine for final evaporation and crystallization.

Solution: DTRO / High-Pressure RO
// SECTION 03 — ENGINEERING DIAGNOSTICS & CURES

Neutralizing the constraints of heavy industry.

In power generation and petrochemicals, equipment failure is not an inconvenience; it is a catastrophic financial event. Here is the deep-dive into how WANDONG ENVIRO architects around the three deadliest industrial constraints.

01

The Cost of Downtime

Power plants and steel mills operate on continuous 24/7 cycles. If a single high-pressure pump fails in the boiler feed water system, the entire steam turbine must trip to prevent explosion. Standard water treatment skids built with single points of failure represent an unacceptable operational risk to the entire facility.

The Engineered Cure: WANDONG ENVIRO enforces N+1 Redundancy & Hot-Standby Architecture. Our industrial skids feature twin Grundfos/Danfoss HP pumps and dual Siemens PLC racks. If the primary system detects a pressure drop or motor fault, the standby system engages in milliseconds. You never lose water pressure, and your plant never stops.

Reliability Matrix
Standard Commercial RO
Single Point of Failure
Pump failure = System shutdown.
WANDONG Industrial Architecture
N+1 Hot Standby
Automatic failover in < 500ms.
Control System
Redundant Siemens PLC
Seamless integration with main plant DCS.

02

Extreme Purity Requirements

High-pressure boilers and microelectronics manufacturing cannot tolerate standard RO water. Even trace amounts of silica or dissolved ions will vaporize, carry over into the steam, and form glass-like scale on turbine blades, destroying multi-million dollar equipment. The requirement is water with a resistance of up to 18 MΩ·cm.

The Engineered Cure: We deploy the Double-Pass RO + EDI (Electrodeionization) Stack. The first pass RO removes 99% of bulk salts. The second pass polishes the permeate, and the final EDI module uses an electrical field to continuously regenerate ion-exchange resins without hazardous acid/alkali chemicals. The result is continuous, ultra-pure water with silica levels guaranteed below 10 ppb.

Purity Metric Comparison
Standard Single-Pass RO
10 - 50 µS/cm
Wandong Double-Pass + EDI
18 MΩ·cm
✓ BOILER-SAFE ULTRAPURE

03

The ZLD Mandate

Heavy industries globally are facing strict environmental mandates to stop discharging wastewater into local rivers or municipal sewers. Transitioning to Zero Liquid Discharge (ZLD) is no longer optional. However, industrial effluent is highly fouling, packed with organics, heavy metals, and scaling compounds that quickly blind standard RO membranes.

The Engineered Cure: We engineer Heavy-Duty Water Reuse Skids. By utilizing robust Ultrafiltration (UF) as pre-treatment and deploying specialized Fouling-Resistant (FR) polyamide membranes with 34-mil wide feed spacers, our systems power through high-COD wastewater. We recycle up to 85% of your effluent back into the cooling towers, drastically shrinking your final brine volume for the evaporator.

Effluent Recovery
Standard Discharge
0% Reuse
High municipal water bills and discharge fines.
WANDONG Reuse Architecture
Up to 85% Recovery
Recycled directly to cooling towers.
Membrane Technology
FR (Fouling-Resistant)
34-mil wide spacer prevents biological blinding.
// SECTION 03.5 — THE TCO ECONOMICS

Why Plant Managers choose Skids.

In an active power plant, the true cost is installation downtime. Welding pipes inside a live facility is a massive safety hazard. Skid-mounted systems eliminate this risk.

Built-in-Place Plant

Equipment CAPEX30%
On-Site Welding (Hot Work Permits)40%
Plant Operational Disruption20%
Project Delays10%
INSTALLATION DOWNTIME
WEEKS
The WANDONG Advantage

Pre-Packaged Skid-Mounted

Equipment CAPEX (Pre-packaged)85%
Zero Hot Work (Flange Connect)10%
Plug & Play Commissioning5%
Total Cost Saved- 40%
SAVINGS
INSTALLATION DOWNTIME
48 HOURS
/ SECTION 04 — ENGINEERING BLUEPRINT

The Ultrapure Water (UPW) Cycle.

We utilize a standardized, field-tested Double-Pass RO + EDI block flow that guarantees absolute purity for high-pressure boiler feed.

TOPOLOGY: DOUBLE-PASS RO + EDI
RECOVERY: ~70%
APPLICATION: BOILER FEED WATER
CONTROL: SIEMENS S7 PLC (REDUNDANT)
STEP-01
UF Pre-treatment
Hollow Fiber PVDF
Removes suspended solids and organics (SDI < 2).
STEP-02
Pass 1 RO Stack
DOW BW30 Elements
Removes 99% of bulk dissolved salts.
NaOH Dosing (pH Adjust)
STEP-03
Pass 2 RO Stack
DOW LE Elements
Polishes permeate to < 5 µS/cm.
CORE
STEP-04 ♦

EDI Stack

Electrodeionization

Continuous electrical regeneration. Produces 18 MΩ·cm ultrapure water.

STEP-05 ★

UPW Storage

Nitrogen Blanketed

Ready for high-pressure boiler feed.

INLET: FEED TDS
< 1000 ppm
OUTLET: CONDUCTIVITY
18 MΩ·cm
SILICA (SiO2)
< 10 ppb
SYSTEM RECOVERY
~70%
/ SECTION-05A / LIMITS

Inlet Boundary
Conditions.

Feed water to the EDI stack must comply with the following strict parameters. Exceeding these limits will irreversibly damage the ion-exchange resins.

PARAMETER MAX LIMIT (EDI FEED)
Conductivity Equivalent (TEA)< 40 µS/cm
Free Chlorine (Cl₂)< 0.02 ppm
Total Hardness (as CaCO3)< 1.0 ppm
Silica (SiO2)< 0.5 ppm
/ SECTION-05B / COMMITMENT

Target Permeate
Performance Guarantee.

When inlet conditions are met, WANDONG ENVIRO contractually guarantees the following Ultrapure Water (UPW) quality standards.

OUTPUT METRIC GUARANTEED VALUE
Resistivity≥ 16 - 18 MΩ·cm
Silica (SiO2)< 10 ppb
Sodium (Na+)< 10 ppb
TOC< 20 ppb
// SECTION 06 — AUTOMATION PROTOCOLS

Seamless DCS Integration.
Unattended Operation.

Your water plant shouldn't be an isolated island. Our Siemens/Schneider PLCs are engineered to handshake flawlessly with your main plant's Distributed Control System (DCS), providing total visibility and control from your central control room.

Industrial water treatment requires absolute synchronization with the main production facility. A sudden drop in boiler feed water tank levels must instantly trigger the RO/EDI skid to ramp up production.

We utilize standard Modbus TCP/IP or Profibus protocols to map every sensor, valve, and pump status directly to your Yokogawa, Emerson, or ABB DCS. Your operators have full read/write access to the water plant without leaving their desks.

Predictive Maintenance Alerts

The PLC continuously trends Transmembrane Pressure (TMP) and EDI voltage/current ratios. Instead of waiting for a failure, the system pushes a predictive alert to your DCS when a CIP (Clean-in-Place) cycle will be required within the next 7 days, allowing you to schedule maintenance without disrupting plant operations.

DCS Handshake Matrix
Protocol MODBUS TCP/IP
UPW Tank Level AUTO-START/STOP
EDI Resistivity CONTINUOUS FEED
High TMP Alarm DCS NOTIFY
> DCS_LINK: ESTABLISHED
> UPW_RESISTIVITY: 18.2 MΩ·cm [OPTIMAL]
> RO_RECOVERY: 72% [STABLE]
> ACTION: NO INTERVENTION REQUIRED.
// SECTION 07 — GLOBAL SUPPLY CHAIN

Tier-1 Components. Zero Compromise.

DuPont™®
GRUNDFOS
SIEMENS
Danfoss
Schneider
// SECTION 08 — INDUSTRIAL LOGISTICS

Shipping & Footprint Matrix.

Available in open-frame skids for indoor plant installation, or fully containerized for outdoor deployment.

System Model Capacity (m³/h) Application Format
WD-UPW-10 10 m³/h Medium Boiler Feed Open-Frame Skid
WD-UPW-50 50 m³/h High-Pressure Boiler Open-Frame Skid
WD-REUSE-100 100 m³/h Cooling Tower Blowdown 40'HQ Containerized
WD-ZLD-50 50 m³/h Zero Liquid Discharge Custom Modular
// SECTION 09 — EHS COMPLIANCE

Guaranteed Safety & Compliance.

Heavy industry operates under strict regulatory frameworks. Our systems are engineered to meet ASME standards for pressure vessels and local EPA mandates for wastewater discharge.

ASME Compliance

High-pressure vessels and piping designed and tested in accordance with ASME Boiler and Pressure Vessel Code.

ZLD Environmental Mandates

Reuse systems engineered to help facilities meet Zero Liquid Discharge (ZLD) regulatory requirements.

Performance Guarantee

We contractually guarantee UPW resistivity and silica levels. If we don't hit the spec, we fix it at our cost. No excuses.

// SECTION 10 — TECHNICAL Q&A

Hardcore FAQ.
Engineering-Grade Answers.

Q-01 / DCS INTEGRATION

Can you integrate with our existing Yokogawa/Emerson DCS?

+
Yes. Our standard Siemens S7 or Schneider PLCs are equipped with communication modules supporting Modbus TCP/IP, Profibus, or Ethernet/IP. We provide the complete memory map (register list) so your DCS engineers can seamlessly pull all sensor data and control tags into your central control room.
Q-02 / FOOTPRINT

What is the footprint of a 50m³/h UPW skid?

+
By utilizing a multi-tier vertical skid design, a complete 50m³/h Double-Pass RO + EDI system can be condensed into a footprint of approximately 8 meters (L) x 2.5 meters (W) x 3.5 meters (H). This allows it to be dropped directly into existing plant utility rooms without requiring facility expansion.
Q-03 / WASTEWATER REUSE

How do you handle high COD in cooling tower blowdown reuse?

+
Cooling tower blowdown often contains high organics (COD) and scaling inhibitors. We deploy a robust pre-treatment train consisting of coagulation/flocculation, followed by Ultrafiltration (UF). For the RO stage, we specify Fouling-Resistant (FR) polyamide membranes with 34-mil wide feed spacers, which resist biological blinding far better than standard brackish water elements.
Q-04 / EXPLOSION PROOF (ATEX)

Do you provide ATEX/Exd rated systems for petrochemical plants?

+
Yes. For Zone 1 or Zone 2 hazardous areas in oil & gas facilities, we upgrade all motors, instruments, and control panels to strict ATEX/Exd explosion-proof standards. The main PLC cabinet can be purged with nitrogen or located remotely in a safe zone.
Q-05 / FAT & INSPECTION

How do we verify the system before it leaves your factory?

+
We mandate a 100% wet Factory Acceptance Test (FAT). We run the system at full capacity using simulated feed water to prove the 18.2 MΩ·cm output and verify the N+1 redundant failover logic. We welcome your engineers or third-party agencies (SGS/TÜV) to witness the FAT in person or via live stream.
Q-06 / SPARE PARTS

How do you ensure spare parts availability for 20+ years?

+
We strictly use globally standardized Tier-1 components (Grundfos, Danfoss, Siemens, DuPont). You are never locked into proprietary, hard-to-find parts. You can source replacements from local distributors worldwide, or order directly from our factory inventory with 72-hour DHL dispatch.
// SECTION 11 — VERIFIED DEPLOYMENTS

Proof in the field.

View All Case Studies →
// SECTION 12 — INITIATE PROTOCOL

SECURE YOUR PLANT'S
WATER SUPPLY.

You focus on maximizing production uptime; let us handle the heavy-duty water infrastructure. Submit your parameters, and our engineering team will architect a custom, fail-safe solution guaranteed to perform.

1h
INITIAL RESPONSE
1-ON-1
CUSTOM PROPOSAL
$0
CONSULTATION FEE
// SECURE YOUR SUPPLY CHAIN

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