Disinfection of secondary and tertiary treated wastewater effluents of municipal and industrial WWTP plants of medium and large flow capacities. Applications in combined sewer overflow and storm water disinfection systems.
- State-of-the-art high intensity low-pressure amalgam lamps with prolonged operating lifetime;
- Safe, simple and quick maintenance of the lamps without lifting the module out of the water;
- Vertical design provides a semi-turbulent plug flow ensuring that all water receives maximum exposure to germicidal UV light;
- Compact size through vertical configuration;
- Equipped with PLC based monitors and control systems controlling of each UV lamp;
- Electronic ballasts significantly reduce power consumption and increase the overall system efficiency;
- UV sensors provide greater operational security;
- The series is equipped with effective chemical and mechanical cleaning systems
The LIT 88-MLV UV Disinfection System has a modular design for flexible, easy system integration, installation and operation. Key component of the 88-MLV series UV system are the 88-MLV-24A module consisting of 24 vertically placed lamps and the 88-MLV-36A module, consisting of 36 vertical lamps. The lamps are arranged in four parallel rows of six, respectively nine lamps in each row. The modules can be installed in the channel separately or can be grouped in series and/or in parallel. Each module has a quick-attachment cover lid that allows the lamps to be checked or replaced without having to remove the module out of the water flow or disturb the quartz sleeve seals.
Electronic ballast cabinets are installed near each UV bank above the channel. Each UV module is connected to the electronic ballast cabinet through a pair of waterproof plugs. High efficiency electronic ballasts are installed inside the cabinets. Each cabinet has a small LCD display to provide the information about UV module and UV lamp status in each respective UV bank.
The operation of the UV plant is guided through a Control Cabinet on basis of an industrial PLC system. The front of the cabinet is provided with a control panel with graphical user interfaces to control the UV system, which can be operated both in automatic and manual modes. All operational data from the UV system can be transmitted to the main WWTP control centre through the standard industrial serial bus. The Control System incorporates a data logging function for recording all operating parameters.
Each bank of UV plant is equipped with two UV-radiation intensity meters. The UV sensor measures the UV intensity inside the UV bank, converts the analogue signal to digital form and transmits it to the Operating and Control system.
Each disinfection channel is equipped with an automatic level control system. It consists of a motorized sliding gate mounted at the channel outlet, PLC controller and ultrasonic and/or variable-capacitance water level sensor. A level control system maintains proper water levels inside the disinfection channel at 0-100% flow variations. It prevents overflow and guarantees that all water will be treated properly without by-passing the UV modules.
The 88-MLV UV system is provided with a chemical cleaning system for the quartz sleeves in each channel without removing lamp modules from the channels. All lamps in a channel being treated are cleaned simultaneously. During the cleaning period a UV channel is closed and water effluent passes through the remaining channels. The cleaning system consists of a tank for washing solution preparation, circulation pump, a system of stainless steel pipes and switching valves.
At high levels of suspended solids in the treated wastewater an optional automatic mechanical wiping system can be supplied with the 88-MLV UV modules. This system is cleaning the quartz sleeves without having to remove the UV modules from the channels. Such cleaning prevents quartz sleeve fouling during UV system operation, it removes deposits from the quartz sleeve surface by mechanical wipers which are moved periodically along quartz tubes. The wiping frequency can be adjusted through PLC control unit supplied for the entire wiping system. The pneumatic/hydraulic cylinders are powered by air compressor with receiving tank.
- UV Module Service Rack
The 88-MLV UV system includes a mobile frame to fit the extracted modules during service works (e.g. lamp replacement). Each frame is designed to support one module for repair, cleaning or storage.
- Flow Equalizing Gratings
At limited space conditions, when the channel length is restricted, stainless steel gratings with profiled holes can be installed at each channel entry to provide better water flow mixing and distribution across channel.
- Channel Cover Plates
When operating the channels with UV banks are covered by profiled zinc galvanized iron plates.