Case Study

Long Beach Township

Calcium Hypochlorite feeder selected as primary solution for municipal water treatment plants

Background

Long Beach Township is the largest town on Long Beach Island, New Jersey. Wrth 18 miles of beaches, the town is a major tourist destination. Population explodes during the summer months from approximately 3,000 to over 100,000. This can be a challenge for the town’s drinking water facilities, with demand increasing exponentially during the tourist season.

Long Beach Township owns four water treatment plants [WTPs) with capacities ranging from 1.4 to 2.8 MGD. The smallest plant process consists of wells and chlorination facilities. The other three plant processes include wells, iron removal using aeration, settling. prechlorination for oxidation, pH adjustment, pressure filtration, and post-chlorination for disinfection.

In 2012, Long Beach Island was pummeled by the catastrophic storm surge and winds of Hurricane Sandy. Three of the town’s four water plants were badly damaged. Plans were made to rebuild the facilities to higher standards to withstand potential storm impacts. Construction on the first plant was completed in 2017, and the new Brant Beach WTP is currently being built. The third treatment plant will be built in the next few years.

The Challenge

Historically, the town used various disinfection technologies at the fourWTPs. Some of the plants used chlorine gas. This technology was phased out due to regulatory issues and restrictions on handling and storing the chemical. Those disinfection systems were converted to granular chlorine. However, with the large population fluctuation it was difficult to maintain a stable residual. In addition, maintenance of these systems was labor intensive and time consuming.

About 10 years ago, Michael Clark, Superintendent of Long Beach Township’s Water/Sewer Department researched disinfection technologies to replace the granular chlorine systems.

Clark discussed the problems with Louis Finelli of Constant Chi or, who set up a Constant Chi or» ( calcium hypochlorite) pilot project at one of the town’s treatment plants. The project was successful, yielding a stable chlorine residual in the system despite fluctuating demands. Long Beach Township installed the system and it performed excellently over the years.

After Hurricane Sandy, staff needed to decide on which disinfection technology to use for the new water treatment facilities.

The Solution

Michael Clark and his staff worked with their engineers to determine which disinfection equipment should be used at the new water plants.

As noted, one of Long Beach Township’s facilities (the only one that wasn’t affected by Hurricane Sandy) used Constant Chlor® technology for disinfection. This system uses small, dry calcium hypochlorite briquettes which have a long shelf life compared to Sodium Hypochlorite. The customizable feeding system automatically adds water with a patented spray technology to prepare and deliver a consistent 1.2 – 1.5 percent chlorine solution. In addition, the technology is very compact, making it an excellent choice for retrofit projects and treatment plant upgrades where space may be at a premium.  The town’s employees had been extremely pleased with the past performance of this system. Over a period of 10 years they realized many important benefits of using the Constant Chlor® disinfection technology that would work well at the new treatment facilities.

Staff and engineers reviewed various disinfection technologies and made site visits to observe them in operation. Based on their review and the success of the existing Constant Chlor® system, engineers specified Constant Chlor® technology for the new treatment facilities. Constant Chlor’s® representative, Lou Finelli, was able to assist during the design phase to optimize the systems.

Constant Chlor® equipment is now installed at two of the four plants and will be used at the new Brant Beach plant now under construction. Constant Chlor® technology will be installed at the fourth plant within the next eight months.

Increased Rellablllty and Reduced Maf ntenance
Wrth the granular chlorine system, operators had a difficult time dialing in the process to provide a consistent residual. In addition, these systems were a maintenance headache. The granular chlorine systems required two to four technicians working 30 hours a week on maintenance and repair. The Constant ChlorG\ systems have only required one or two people for
an hour a month, with no system failures. Clark noted, “What we save in manpower and maintenance has been tremendous. We’ve been able to allocate personnel to other operational improvements that we didn’t have time for in the past.”

Results

The Constant Chlor® system has been a success, with several benefits for the town.

Ability to Keep a Stable Chlorine ResiduaI
Long Beach Township’s demand changes dramatically throughout the year. The Constant Chlor® system allows staff to feed a fresh, reliable 1.2 -1.5 percent chlorine solution during both high and low demand periods. Problems with solution degradation are avoided. “The ability to make chlorine solution as needed provides a much more stable residual in the system,” noted Clark.

Increased Reliability and Reduced Maintenance
With the granular chlorine system, operators had a difficult time dialing in the process to provide a consistent residual. In addition, these systems were a maintenance headache. The granular chlorine systems required two to four technicians working 30 hours a week on maintenance and repair. The Constant Chlor® systems have only required one or two people for an hour a month, with no system failures. Clark noted, “What we save in manpower and maintenance has been tremendous. We’ve been able to allocate personnel to other operational improvements that we didn’t have time for in the past.”

Standardization

Long Beach Township’s Water/Sewer Department has a small staff. By standardizing the disinfection technology at all facilities, operators will only need training on one system. Standardization also allows for bulk orders of the Constant Chlor® briquettes, which is less expensive and eliminates shipping costs. Spare parts for the systems are minimized and centralized.

Product Delivery and Storage

Constant Chlor® calcium hypochlorite briquettes come in 50-pound pails and can be easily stored to minimize orders. Orders are typically delivered within a few days. The tablets can be safely stored in a cool, dry building near the feeder.

Emergency Preparedness

Tropical storms and other natural disasters often result in limited supplies. including chemicals. The shelf-life of the briquettes allows the town to stockpile supplies during hurricane season.

Product Delivery and Storage

Good customer service is huge,” said Clark. Being able to contact someone quickly, even after hours, is important. We’ve had a good working relationship with Constant Chlor® and our dealer, GP Jager Inc. which made the transition to Constant Chlor® technology seamless.”

Permitting

Any change in disinfection technology requires approval from the regulatory agencies. Long Beach Township’s success with Constant Chlor® technology provides evidence of the system’s performance. In addition, Constant Chlor® works very well with engineers. They can provide a temporary pilot system to demonstrate effectiveness at no charge except for purchase of the chemical.

MC4 Feeder Diagram