Series description

Modular 88MLV series is based on up-to-date high output amalgam lampsand designed for installation into open channels for wastewater disinfection.

Lamps in a module are arranged in several staggered arrays installed inthe vertical direction perpendicular to water flow.

Each lamp is placed in a protective sleeve of quartz glass with high transmittance of UV radiation.

Application

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.

88MLV series advantages

• State-of-the-art high output low-pressure amalgam lamps with prolonged operating lifetime;

• Safe, simple and quick maintenance of vertical lamps without lifting the module out of water;

• Vertical design provides semi-turbulent plug flow ensuring that all water receives maximum exposure to germicidal UV light;

• Absence of detachable bases immersed into water provides high reliability throughout service life of the UV equipment;

• Vertical configuration provides a high capacity UV systems with much more compact space layout;

• The series is equipped with PLC based monitor and control system providing control of each lamp in the UV system;

• New electronic ballasts significantly reduce power consumption and increase overall system efficiency;

• UV sensors provide greater operational security;

• The series is equipped with effective cleaning systems of both chemical and mechanical types.

UV Modules

LIT 88MLV UV Disinfection Systems have modular design for flexible, easy system integration, installation and operation. The key component of the 88MLV series UV system is 88MLV-36A module consisting of 36 vertically placed lamps. Lamps are arranged in four parallel rows of 9 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 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.

Ballast cabinets

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.

Power supply cabinets

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 cleaning system.

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. The 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.

UV sensor

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 analog signal to digital form and transmits it to the Operating and Control system.

Automatic level control system

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 levels 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.

Chemical cleaning system

88MLV 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, system of pipes from stainless still and switching valves.

Mechanical cleaning system

At high levels of suspended solids in treated wastewater an optional automatic mechanical wiping system can be supplied with 88MLV UV modules for quartz sleeves cleaning without removing 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.

Additional components

• UV Module Service Rack
  88MLV 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 space limited 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.