Madín II Drinking Water Plant: 15 kg/h Dry-Air Ozone System in Mexico
2 × NLO 7.5 kg/h Ozone Generators for Municipal Drinking Water
The Madín II Drinking Water Treatment Plant in Mexico incorporates a Longking ozone-generation system designed for a treatment flow of 47,800 m³/day.
The installation includes two NLO 7.5 kg O₃/h ozone generators, providing a total installed ozone-production capacity of 15 kg O₃/h, with treated dry air as feed gas.
Developed for CONAGUA, with AWASA as project customer, Madín II is an important Longking reference for dry-air ozone generation in municipal drinking-water treatment, demonstrating the integration of ozone-generation equipment and auxiliary systems within a full-scale water-treatment plant.
Project Scope
The Madín II project required a complete ozone-generation system for integration into a municipal drinking-water treatment plant in Mexico.
Key Project Data
Application: Municipal drinking-water treatment
Treatment capacity: 47,800 m³/day
Ozone generators: 2 units
Ozone production per unit: 7.5 kg O₃/h
Total installed ozone capacity: 15 kg O₃/h
Feed gas: Treated dry air
End user: CONAGUA
Country: Mexico
The project demonstrates Longking’s experience with dry-air ozone generation for municipal drinking-water treatment, including the integration of ozone-generation equipment within a full-scale treatment plant.
Dry-Air Ozone Generation
Unlike many large drinking-water ozone installations that use oxygen as feed gas, the Madín II system operates with treated dry air.
For corona-discharge ozone generation, the quality of the feed gas is an important operating parameter. The air supplied to the ozone generators must be appropriately conditioned so that moisture and contaminants are controlled before the gas enters the ozone-generation modules.
Why Feed-Gas Conditioning Matters
Moisture in the feed gas can affect the ozone-generation process and the long-term operating conditions of the equipment.
A dry-air ozone system therefore requires a properly engineered air-preparation stage upstream of the generators, with the final configuration selected according to the required gas flow, pressure, air quality and ozone-production duty.
Dry Air vs. Oxygen Feed
Dry-air and oxygen-fed ozone systems have different operating characteristics.
Dry-air systems generally operate with lower ozone concentration in the product gas and higher total gas flow for a given ozone mass production than oxygen-fed systems. This affects the design of the downstream gas distribution, diffusion and contact system.
The appropriate feed-gas configuration should therefore be selected as part of the overall ozone-system design rather than on the ozone generator alone.
Madín II Configuration
For Madín II, the selected configuration uses treated dry air to feed two NLO A7.5K ozone generators, providing a total installed capacity of 15 kg O₃/h for a drinking-water treatment capacity of 47,800 m³/day.
This reference demonstrates Longking’s capability to engineer multi-generator dry-air ozone systems for full-scale municipal drinking-water treatment, in addition to its oxygen-fed ozone installations.
NLO Ozone Generation System
The Madín II installation incorporates two Longking NLO ozone generators, each rated at 7.5 kg O₃/h, providing a total installed ozone-production capacity of 15 kg O₃/h.
The NLO platform uses a modular corona-discharge architecture and can be configured for both oxygen and treated dry-air feed. For Madín II, the system was specifically configured for dry-air operation.
Two-Generator Configuration
Using two ozone generators provides operational flexibility across the plant's required ozone-production range.
The units can be coordinated through the plant control architecture so that ozone production is adapted to the actual process requirements.
The exact operating philosophy —including unit sequencing and availability strategy— is defined according to the project control requirements rather than assuming a universal duty/standby configuration.
Corona-Discharge Ozone Generation
Inside the NLO generator, ozone is produced by applying high-voltage, high-frequency electrical discharge to the feed gas within the dielectric discharge zone.
The Longking NLO design uses a double micro-gap dielectric-barrier discharge configuration, together with high-frequency power electronics, to generate ozone from the conditioned dry-air feed.
Integrated Generator Control
Each NLO generator incorporates its own PLC-based control architecture for monitoring and regulation of the ozone-generation process.
Typical monitored variables include operating parameters such as gas flow, pressure, temperature and generator status, with communication to the overall plant control system according to the project requirements.
Designed as Part of the Complete Ozone Plant
The ozone generators are not treated as isolated equipment.
Their operation must be coordinated with the dry-air preparation system, cooling circuit, ozone distribution, contact system, instrumentation and plant automation to achieve the required ozone-production conditions at the point of application.
Closed-Loop Cooling System
Although the Madín II ozone generators use treated dry air as feed gas, ozone generation produces heat that must be removed from the equipment during operation.
The installation therefore incorporates closed-loop water-cooling systems to provide controlled thermal management for the two NLO ozone generators.
Why Cooling Is Critical for Ozone Generation
Corona-discharge ozone generation converts part of the electrical energy supplied to the generator into heat.
Removing this heat is important because generator operating conditions —particularly the temperature of the discharge section— influence the ozone-generation process.
The cooling system therefore works together with the ozone generator to maintain the required water flow and thermal conditions during operation.
Closed Primary Cooling Circuit
In a closed-loop configuration, cooling water is recirculated through the ozone generator and the associated heat-rejection system.
This allows the generator cooling circuit to operate under controlled hydraulic and water-quality conditions rather than relying directly on untreated plant water.
The cooling-water circuit can incorporate monitoring of parameters such as:
Water temperature
Cooling-water flow
System pressure
Cooling-system operating status
These signals can be integrated into the ozone-system control architecture for alarms and equipment-protection interlocks.
Cooling as Part of the Complete Ozone System
The cooling system is coordinated with the ozone generators, dry-air preparation system, electrical equipment and plant automation.
The final operating conditions and cooling capacity are defined according to the thermal requirements of the installed ozone-generation equipment.
Ozone Application & Contact Integration
Producing ozone is only one part of the treatment process. The ozone-containing gas generated by the two NLO units must then be delivered to the water-treatment process under the required gas flow, ozone concentration and pressure conditions.
The ozone application stage must therefore be coordinated with the generator operating range and with the hydraulic characteristics of the treatment process.
Gas Distribution
The ozone gas generated by the NLO units is routed from the ozone-generation system towards the point of application.
Gas piping and distribution components are engineered according to the required:
Ozone gas flow
Ozone concentration
Operating pressure
Distance to the application point
Project layout and safety requirements
Materials exposed to ozone are selected according to the operating conditions and project specification.
Ozone Transfer to Water
Once the ozone reaches the treatment stage, effective performance depends on transferring the gas into the water under suitable contact conditions.
The application system must therefore consider parameters such as:
Water flow
Required ozone dose
Gas flow
Water depth
Contact time
Hydraulic conditions
Water quality and ozone demand
Longking can support ozone projects with diffuser-system engineering and CFD-based hydraulic studies when required, but the exact transfer configuration is defined specifically for each installation.
Contact System Engineering
The ozone generator and the contact stage should not be designed independently.
Gas production, distribution, transfer and chamber hydraulics must be coordinated so that the complete system operates within the required process conditions.
For this reason, Longking approaches ozone application as part of the complete treatment-system engineering scope, rather than treating the generator as an isolated piece of equipment.
Project-Specific Configuration
For Madín II, the confirmed ozone-generation configuration consists of two dry-air-fed NLO A7.5K units with 15 kg O₃/h total installed capacity.
The detailed ozone-contact configuration should therefore only be described using the final project documentation; I would not publish diffuser type, material, quantity or transfer-efficiency figures for Madín unless we have those specific records.
Automation, Monitoring & Safety
A full-scale ozone installation requires coordinated control of the ozone generators, feed-gas system, cooling equipment and process interfaces.
Longking NLO systems use PLC-based control to monitor the ozone-generation process and coordinate the generator with the auxiliary equipment required for operation.
Generator Monitoring
The control architecture can monitor relevant operating parameters such as:
Ozone-generator status
Feed-gas flow and pressure
Operating temperatures
Cooling-water conditions
Electrical operating status
Alarms and equipment-protection signals
The exact instrumentation and monitored variables are defined according to the equipment configuration and project requirements.
Automatic Operating Sequences
PLC-based control allows the ozone system to coordinate the required start-up, normal operation and shutdown sequences between the ozone generators and their auxiliary systems.
Operating permissives and interlocks can be used to prevent ozone production when required conditions —such as adequate feed gas or cooling— are not available.
Plant Control Integration
The ozone system can be integrated with the plant PLC/SCADA architecture for status monitoring, alarms, operating commands and exchange of process signals.
The communication protocol and degree of integration are defined according to the automation requirements of each project.
Ozone Safety
Ozone installations require appropriate consideration of gas containment, ventilation, leak detection and emergency operating logic.
Depending on the project, the system can incorporate ambient ozone monitoring and project-specific interlocks linked to ventilation or equipment shutdown.
Madín II Control Scope
For Madín II, the confirmed equipment configuration includes two NLO A7.5K dry-air ozone generators and their associated plant integration.
I would not publish a specific dosing algorithm, UV-based control strategy, remote-monitoring function or safety sequence for this reference unless those functions are confirmed in the final project documentation.
This keeps the case study technically accurate while still showing that the ozone-generation equipment forms part of an automated and integrated municipal treatment system.
Why Madín II Is a Relevant Longking Reference
Madín II is a significant Longking reference because it combines full-scale municipal drinking-water treatment with dry-air ozone generation, demonstrating an alternative to oxygen-fed ozone systems for this type of application.
Full-Scale Municipal Application
With a treatment capacity of 47,800 m³/day, Madín II demonstrates the application of Longking ozone technology in a full-scale municipal drinking-water plant.
15 kg O₃/h Dry-Air Ozone Capacity
The installation incorporates two NLO A7.5K ozone generators, providing 15 kg O₃/h of total installed ozone capacity using treated dry air as feed gas.
This makes the project particularly relevant as a reference for multi-generator dry-air ozone systems.
Integrated Ozone Plant Engineering
The project illustrates that ozone-generation performance depends on the integration of several subsystems, including:
Feed-gas preparation
Ozone generation
Closed-loop cooling
Gas distribution and application
Electrical and control systems
Plant automation and safety
These elements must be engineered together according to the requirements of the treatment process.
Experience Beyond the Ozone Generator
Madín II reinforces Longking’s capability to support ozone projects not only through equipment supply, but through the engineering and integration of the complete ozone-generation system.
For municipal and industrial projects, the final solution is developed according to the required ozone duty, water characteristics, operating conditions, available utilities and plant integration requirements.
Need Support with a Municipal Ozone Project?
Municipal ozone systems require coordinated engineering across feed-gas preparation, ozone generation, cooling, gas distribution, contact-system integration, automation and safety.
Longking EnTech Europe can support projects from system definition and equipment selection through integration engineering, commissioning and lifecycle support, backed by the manufacturing and R&D capabilities of the Longking Group.