Company Introduces Higher Volume Hypochlorite System

A new, larger calcium hypochlorite briquette feed system has been designed for use in drinking water and wastewater treatment applications requiring higher feed rate capacities.

Arch Chemicals’ new Constant Chlor® Plus briquette feed system retains all of the key features of the first generation system - including the company’s patented Spray Technology (an engineered design providing a well-packed spray bed for optimum solution consistency), simplified installation, and a small footprint.

The new system provides much higher dry chemical loading and feed rate capacities, SCADA monitoring capabilities and many other new features that further enhance operation, maintenance and safety.

Constant Chlor Plus briquettes are specifically designed for use in the Arch feed system and contain a minimum of 65 percent available chlorine (AvCl) by weight, along with a patented inhibitor to reduce the potential for carbonate scale associated with the alkalinity component of water.

Increased Capacity

Arch’s new calcium hypochlorite chlorinator has four times the output capacity of the original feed system. The second generation system has a feed rate capacity of up to 250 lbs/day AvCl, compared to only 62.5 lbs/day with the original system. Plus, the new feeder’s larger hopper provides a dry chemical capacity of 220 lbs. − more than twice that of the original feeder.

“Calcium hypochlorite systems must have the capacity to quickly produce a continuous supply of hypochlorite disinfection solution during peak demand periods,” said Arch Product Manager Dave Blanchette. “We designed our new system both to meet this need and to satisfy the growing demand for effective calcium hypochlorite use in water and wastewater treatment applications requiring higher feed rate capacities.”

Blanchette said the new system retains all of the key features of the original.

“Maintaining constant residual levels is even easier with our second generation system,” he said. “The system can provide up to 250 pounds per day of AvCl, which means more than 10 pounds per hour of AvCl in the form of a 1.7% hypochlorite solution is available on demand. This allows for continuous dosing from the system’s dosing tank.”

This expanded capacity is accomplished without sacrificing space efficiencies. The footprint of the second generation feed system is 14.5 sq. ft. - just a few inches larger than the original unit. The new feeder features dual position controls, thereby allowing it to be configured to fit a variety of installation requirements.

The new Constant Chlor feeder provides a convenient AvCl solution sample feature, plus an optional dilution feature that enables the operator to adjust solution concentrations from 0.5 to 1.7 percent AvCl. For ease of maintenance, the system’s nested configuration provides for simplified disassembly. In addition, three inspection ports allow for observation of components without disassembly. Maintenance can be performed on the unit without service interruption.

The new feed system features a low-chlorine-solution alarm; an optional low-briquette alarm is available - both with dry contacts for sending alarms to a SCADA system or over a modem. For safety, a safety switch automatically terminates nozzle flow when the unit’s lid is opened.