Selecting an ultraviolet system for treated wastewater is not only a question of flow rate. The reactor must also fit the existing pipeline, provide sufficient service access, operate under the actual environmental conditions and remain compatible with the project budget.
This case involved a UVL Aqua 320 flow-through reactor selected for an existing wastewater-treatment line in Ulyanovsk.
Project Background
An engineering company specializing in wastewater and drainage projects contacted UVL to select equipment for the disinfection of treated effluent.
The initial requirement was for a UV system with a capacity of 12 m³/h. However, the equipment also had to connect to an existing DN150 pipeline and fit a predetermined installation area.
Initial Parameters
Medium: treated wastewater
Requested flow rate: 12 m³/h
Selected reactor capacity: 25 m³/h
Pipeline connection: DN150
Reactor material: stainless steel
Nozzle arrangement: customized for the installation
Control cabinet: weather-resistant outdoor version
Application: integration into an existing treatment line
The project therefore required both process selection and mechanical adaptation.
Why a Standard Configuration Was Not Sufficient
At first, the task appeared straightforward: select a UV reactor, provide a control cabinet and connect the equipment to the existing line.
The main complication was the connection geometry.
The customer’s pipeline used DN150 flanges, while the UV reactor body had a smaller diameter. Installing a standard unit without reviewing the nozzle arrangement could have created several problems:
misalignment with the existing pipeline;
excessive use of fittings and adapters;
insufficient maintenance clearance;
additional loads on the reactor connections;
difficulty constructing the support frame;
unnecessary modification work at the site.
The equipment therefore had to be considered as part of the complete piping layout rather than as an isolated component.
Several nozzle configurations were discussed before the final arrangement was approved. The objective was to connect the reactor to the DN150 line while keeping installation and future maintenance practical.
Selecting a 25 m³/h Unit for a 12 m³/h Requirement
Although the original request specified a flow rate of 12 m³/h, the selected model was the UVL Aqua 320, rated for up to 25 m³/h under its defined operating conditions.
This provided operational capacity above the initial requirement and allowed the project to use a suitable industrial reactor configuration.
However, the nominal flow rating should not be interpreted as a universal guarantee of disinfection performance. The result of UV treatment also depends on:
the required UV dose;
UV transmittance of the treated wastewater;
suspended solids;
water temperature;
lamp ageing;
fouling of quartz sleeves;
actual hydraulic conditions inside the chamber;
maximum rather than average flow.
For this reason, the final selection must always be checked against the actual water-quality data and the required microbiological result.
Installed capacity above the current flow can provide useful operating reserve, but it does not replace process calculations or water analysis.
Mechanical Adaptation to DN150
The existing line was designed around DN150 connections. To integrate the UV reactor, the mechanical design included transitions between the pipeline and the smaller reactor chamber.
The transition geometry had to be arranged so that it would:
maintain alignment with the existing pipework;
avoid unnecessary reconstruction of the line;
provide reliable flanged connections;
prevent excessive mechanical stress on the reactor;
leave enough space for servicing;
allow the customer to manufacture the mounting frame in advance.
The orientation of the inlet and outlet nozzles was individually coordinated with the customer. This was especially important because the actual site layout, not a standard catalogue drawing, determined how the equipment could be installed.
Reducers and transition pieces should not be used to support the weight of the reactor or adjacent piping. The chamber and pipeline require suitable independent supports, and thermal or mechanical loads should not be transferred to the reactor connections.
Selected Equipment
The final configuration was based on a UVL Aqua 320 flow-through UV disinfection unit.
The stainless-steel chamber was selected for installation in the treated-wastewater line. The equipment package included a control cabinet designed for outdoor operation.
Final Configuration
UV reactor: UVL Aqua 320
Design capacity: up to 25 m³/h under specified conditions
Process medium: treated wastewater
Existing pipeline: DN150
Chamber material: stainless steel
Connection geometry: customized
Control cabinet: outdoor version
Installation: integration into an operating treatment line
The outdoor cabinet allowed the electrical components and electronic ballasts to be placed in an enclosure appropriate for the planned installation environment.
The degree of environmental protection must still correspond to the actual site conditions, including precipitation, dust, ambient temperature, direct sunlight and the possibility of condensation.
Why Installation Drawings and Photographs Mattered
The customer needed more than a commercial proposal. Before the equipment arrived, the installation team had to understand how it would be positioned and supported.
During production, the parties coordinated:
the reactor drawing;
nozzle orientation;
connection dimensions;
mounting requirements;
payment and delivery arrangements.
When the equipment was nearly ready, the customer requested photographs of the completed unit. These images were needed to prepare the support frame before delivery.
This small step helped shorten the time between shipment and commissioning. Instead of waiting for the reactor to arrive before designing the frame, the contractor could begin preparing the installation area in advance.
For custom industrial equipment, drawings and production photographs can be almost as important as the product specification itself.
Integration Without Rebuilding the Entire Line
The final design allowed the UV reactor to be installed in the existing DN150 pipeline without reconstructing the entire treatment system.
The integration included:
Preparing a suitable support frame.
Aligning the reactor with the existing pipeline.
Installing the DN150 transition connections.
Providing clearance at the lamp-service end.
Mounting the outdoor control cabinet.
Routing power and control cables.
Checking pipe loads and flange alignment.
Performing hydraulic and electrical commissioning.
The installation layout must provide enough axial clearance to remove lamps and quartz sleeves. If this service zone is blocked by a wall, pipe or other equipment, routine maintenance may require dismantling part of the pipeline.
UV Disinfection Without Reagent Dosing
Ultraviolet treatment provides microbiological disinfection without adding chlorine or other chemical reagents to the treated water.
This gives the operator several practical advantages:
no disinfectant dosing system;
no chemical storage for the UV stage;
no routine purchase of treatment reagents;
no change in the basic chemical composition of the water caused by a disinfectant;
immediate treatment during passage through the reactor.
At the same time, UV does not remove dissolved chemicals, suspended solids or other pollutants. It should be installed after the preceding treatment stages have produced water with suitable UV transmittance and solids content.
The quartz sleeves must also be inspected and cleaned because deposits reduce the amount of UV energy reaching the water.
Commissioning Considerations
Before the installation enters regular operation, the contractor should verify:
actual maximum flow through the reactor;
direction of water flow;
pipeline and flange alignment;
absence of leakage;
correct support of the chamber and pipework;
operation of all lamps and electronic ballasts;
cabinet protection and cable sealing;
available maintenance clearance;
quartz-sleeve cleanliness;
function of operating indicators and alarms.
Microbiological sampling before and after the UV stage may be required to confirm that the installed system achieves the project target under real operating conditions.
Benefits for the Customer
The completed project provided:
non-chemical disinfection of treated wastewater;
integration into the existing DN150 pipeline;
an individually coordinated nozzle arrangement;
capacity above the initial 12 m³/h requirement;
a stainless-steel industrial reactor;
a weather-resistant outdoor control cabinet;
advance information for manufacturing the mounting frame;
a complete solution prepared for installation and commissioning.
The customer received equipment adapted to the actual site rather than a standard reactor that would have required extensive modification during installation.
Conclusion
This project demonstrates that integrating a UV reactor into an existing wastewater line requires attention to both process performance and mechanical layout.
The original request was for 12 m³/h, but the final solution used a UVL Aqua 320 unit rated for up to 25 m³/h. The reactor was adapted to the existing DN150 pipeline through coordinated connection geometry and supplied with an outdoor control cabinet.
The result was a compact industrial solution that could be installed without completely rebuilding the treatment line.
In projects like this, successful UV implementation depends not only on choosing a lamp or reactor capacity. It also requires accurate drawings, suitable transitions, proper supports, maintenance clearance and coordination with the contractor before the equipment reaches the site.
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