NLQ-H Series – Horizontal Open Channel UV Disinfection System
Precision hydraulics, proven reliability, and sustainable disinfection for municipal and industrial plants
Engineered where hydraulic precision meets optical power.
The Longking NLQ-H Series represents the most advanced generation of horizontal open-channel UV disinfection systems, designed to deliver uniform irradiation, low head loss, and fully automatic, chemical-free performance.
Developed and validated in Europe, the NLQ-H platform integrates low-pressure high-output (LPHO) amalgam lamps, robust stainless-steel construction, and intelligent control automation to provide reliable disinfection for municipal, industrial, and reuse applications.
Design Philosophy – Uniform Dose, Minimal Loss, Maximum Accessibility
Unlike vertical UV systems that minimize footprint, the horizontal configuration of the NLQ-H Series is optimized for hydraulic stability and ease of maintenance.
Each module is the result of computational fluid dynamics (CFD) optimization and extensive field validation.
Design benefits include:
Perfect UV dose uniformity across the full channel section.
Low head loss (< 100 mm) even at design flow up to 3 000 m³/h per channel.
Easy lamp access from the upper deck without draining the channel.
No live electrical components in contact with water, ensuring total operator safety.
Simplified integration in existing concrete or stainless-steel channels.
This architecture guarantees consistent microbial inactivation and continuous operation under variable hydraulic conditions.
Key Technical Features
Hydraulic & Optical Design
Horizontal Lamp Arrangement: Parallel to the flow to minimize shadowing and maximize UV exposure.
CFD-Validated Hydrodynamics: Optimized velocity profile and turbulence control for even dose distribution.
Enclosed Quartz Sleeves: Maintain optical transparency and mechanical protection.
Construction & Components
Material: AISI 316L stainless steel and EPDM seals for corrosion resistance in harsh environments.
Lamp Type: LPHO amalgam lamps (320 W nominal) with lifetime > 12 000 h.
Mechanical Robustness: Modules designed for submerged operation with full structural support and minimal deformation.
Cleaning & Maintenance
Automatic Pneumatic Wiping System:
Operated by compressed air with piston-driven scrapers.
Maintains > 95 % sleeve transmittance without chemicals.
Reduces manual cleaning frequency by over 90 %.
Accessible Replacement: Lamps and sleeves removable without disassembling modules.
Automation & Control
PLC + HMI Control System: Monitors UV dose, intensity, lamp status, cleaning cycles, and operation hours.
Adaptive Power Regulation: Modulates lamp output according to flow rate and UVT.
Remote Integration: Compatible with SCADA via Modbus TCP/IP or Profibus.
Redundant Sensor Option: For regulatory compliance and high-availability installations.
Operational Advantages
High Uniformity: Stable dose even under fluctuating flow or UVT.
Energy Efficiency: Adaptive power control minimizes consumption.
Minimal Maintenance: Automated cleaning keeps performance constant.
Safety by Design: All electrical components isolated from water.
Quick Installation: Modular banks allow phased assembly and future expansion.
Reduced OPEX: Lower power demand and no chemical cleaning cost.
Applications
The NLQ-H Series is ideal for:
Municipal tertiary wastewater disinfection (urban WWTPs).
Industrial process and cooling water treatment.
Water reuse and irrigation (reclaimed effluent).
Advanced oxidation or hybrid UV-ozone systems.
Retrofit of existing channels requiring safe and modular UV upgrade.
Engineering Validation and Sustainability
Every NLQ-H module is engineered, assembled, and factory-tested in Europe under Longking’s ISO 9001 QA/QC framework.
Hydraulic validation, electrical safety, and optical calibration are performed before shipment to guarantee performance stability and full traceability.
By combining low energy demand, chemical-free operation, and durable construction, the NLQ-H Series supports sustainable disinfection and water reuse, contributing directly to SDG 6 (Clean Water) and SDG 14 (Life Below Water).
Built to perform. Validated to endure. Engineered for reliability.