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USFilter, a part of Siemens Water Technologies, will be exhibiting the OSEC® On-site Electrolytic Chlorination system at the American Water Works Association’s annual conference and exhibition.

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USFilter, a part of Siemens Water Technologies, will be exhibiting the OSEC® On-site Electrolytic Chlorination system at the American Water Works Association’s annual conference and exhibition.

Through the electrolysis of a brine solution, the OSEC system produces a 0.8% sodium hypochlorite solution, consuming only salt, water and electricity. This solution is stored in a day tank and injected into the distribution system by a metering pump. Fifteen gallons of 0.8% sodium hypochlorite is equivalent to one pound of chlorine gas or one gallon of commercial sodium hypochlorite (12%).

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“By producing a low-concentration hypochlorite solution on site and on demand, the OSEC system eliminates the safety concerns associated with storing chlorine gas and transporting commercial hypochlorite,” said OSEC Product Manager Alberto Garibi. “The system also minimizes hypochlorite degradation during storage and reduces operating costs.”

How It Works

In the system, saturated brine solution is combined with dilution water. The resulting 3% brine solution enters the OSEC electrolyzer, which is the core of the system. Within the electrolyzer, the brine solution supports an electrical current applied between the anode (positive electrode) and cathode (negative electrode). Electrolysis breaks down the brine and results in chlorine gas being produced at the anode and sodium hydroxide and hydrogen gas being produced at the cathode. Chlorine further reacts with the hydroxide to form sodium hypochlorite.

A hypochlorite storage tank stores sufficient hypochlorite for ready-use and also provides for the release and removal of hydrogen produced by the generation process. Storage is generally provided for 24 hours of operation, although this can be increased or decreased depending on available space and site conditions.

To maintain a continuous supply of hypochlorite, level probes in the tank provide start/stop control signals to the OSEC generator. Air blowers mounted on or near the tank dilute the hydrogen below its low flammability limit and force-ventilate the tank to an outside discharge.

The OSEC process is completely automated, making it suitable for remote or unmanned locations. A PLC-based control panel monitors operating conditions and contains safety interlocks to ensure the safe and reliable operation of the system. Alarms and remote monitoring functions are available to interface with the plant’s SCADA system or other PLCs. Customized HMI and operator interface modules can be supplied to meet special requirements or match plant standards.

Two different OSEC configurations are available to meet specific needs and requirements:

The OSEC-BP, a low capacity, wall-mountable system for capacities to 50 lbs of equivalent chlorine per day; and

• The B-Series OSEC system, a high-capacity, high-efficiency unit available in five different configurations with capacities ranging from 50 to 2,000 lbs per day.

To learn more about the OSEC system, visit AWWA Booth # 2029 in Hall C or contact Alberto Garibi directly at 305-567-0596 or at alberto.garibi@siemens.com.

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