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
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.
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 the 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. 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. 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 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.
Chemical cleaning system
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.
Mechanical cleaning system
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.
Additional components
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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.
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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.
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