ultraviolet water disinfection equipment

Channel Cover Plates
At operating conditions the channels with UV banks are covered by profiled zinc galvanized iron plates

Flow Equalizing Gratings
At space limited conditions, when the channel length is restricted, stainless steel gratings with profiled holes installed at each channel entry to provide better water flow mixing and distribution across channel.

UV Module Service Rack
11MLP UV system includes a mobile frame to fit the extracted modules during service works (e.g. lamp replacement). Each frame is designed to support 2 lamp modules for repair, cleaning or storage.

At high levels of suspended solids in treated wastewater the Optional automatic mechanical wiping system can be supplied with 11MLP UV modules for quartz sleeves cleaning without removing UV modules from the channels. It prevents quartz sleeve fouling during UV system operation. It removes deposits from quartz sleeve surface by mechanical wipers which are moved periodically along quartz tubes. The wiping frequency can be adjusted through PLC control unit provided for entire wiping system. The pneumatic/hydraulic cylinders are powered by air compressor with receiving tank.

11MLP UV system design is provided with chemical cleaning system for the quartz sleeves in each channel without removing lamp modules from the channels. All lamps in each channel are cleaned simultaneously. During the cleaning period a UV channel is closed and water effluent passes through remaining channels. The cleaning system consists of a tank for washing solution preparation, circulation pump, system of pipes from stainless still and switching valves.

Each disinfection channel is equipped with automatic level control system. It consists of 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 level inside the disinfection channel at 0-100% flow variations. It prevents overflows and guarantees that all water will be treated properly without bypassing the UV modules.

Each bank of UV plant is equipped with two UV radiation intensity meters. UV sensor measures the UV intensity inside the UV bank, converts the analog signal to digital form and transmits it to the Operating and Control system.

Control and operation of the UV plant is provided through a Control Cabinet. On a front door of the cabinet there is a control panel with graphical user interface to control the UV system. UV system can be operated both in automatic and manual modes. The control system is implemented on the base of industrial PLC system. There is an optional possibility to transmit all operational data from the UV system to the main WWTP control centre through the standard industrial serial bus. The Control System incorporates the data logging function for recording all operating parameters as well as alarm history. The minimum capacity of the log register is 1 year.

For large-scale UV systems incorporating multiple UV channels the power supply of the UV system is realized through separate Distribution Power Supply Cabinet. In the cabinet there are overcurrent protection fuses, main power switch and power switches for each UV bank. The electricity requirements for UV system are 380 V / 3 phase / 50 Hz. From the distribution power supply cabinet there are electrical connections to the electronic ballast cabinets, water level control system, motor drives of the shut-off sliding gates and the cleaning system.

Electronic ballast cabinets are installed near each UV bank above the channel. Each UV module is connected to the electronic ballast cabinet through pair waterproof plugs. High effeciency 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 respective UV bank.

All open channel UV modules are equipped with modern, industrially manufactured germicidal lamps that were developed by LIT engineers especially for wastewater disinfection. Newest amalgam high intensity lamps have three times more UV intensity than conventional mercury low-pressure lamps. LIT amalgam lamps have long service life: more than one year of continues operation. Low depreciation of UV radiation intensity at the end of lamps life and increased stability over water temperature variations guarantees effective disinfection during the lamp's life . The spectrum of UV lamps is optimized for germicidal effect.

Each 11MLP UV module comprises of high power low-pressure amalgam lamps arranged in two vertical columns. The UV lamps are sealed in quartz sleeves which are placed in a horizontal position, parallel to the wastewater flow in the channel. UV modules can be removed from the bank independently from each other by hand or with auxiliary hoisting device. A group of lamp modules are known as a lamp bank.

LIT 11MLP UV Disinfection Systems have modular design for flexible, easy system integration, installation and operation. Designed for installation in an open channel, the 11MLP system can be provided in several configurations.

UV sensors provide greater operational security;

Electronic ballast increases overall system efficiency;

Extensive, flexible monitoring and control capabilities;

Effective chemical and mechanical cleaning technologies;

Long guaranteed lamp operating lifetime of 10 000 hours;

State-of-the-art low-pressure discharge lamps;

LIT 11MLP UV systems are the ideal choice for disinfection of secondary and tertiary treated wastewater effluent. The flexible modular design of the 11MLP series allows UV disinfection technology to be used in a wide range of flow capacities from small communities, cottage villages WWTPs to large-scale municipal WWTPs of cities with several million populations.

Open channel architecture with minimized head losses and enhanced hydraulic parameters makes 11MLP series suitable for installation in wide range of existing WWTP hydraulic schemes with minimal construction works.

The LIT 11MLP series is the newest UV disinfection equipment and incorporating the latest advances in germicidal lamp technology, electronics and hydrodynamic modeling. The compact modular design of LIT 11MLP system allows engineers to configure UV systems according to customer specific requirements providing most cost effective solutions.