Low pressure, high output
Aquaray SLP-WW UV systems from Degremont Technologies offer compact and high-efficiency disinfection for wastewater plants with flows from 44 mgd to 615 mgd. Units have computational fluid dynamics (CFD) to ensure accurate flow distribution and minimize head loss.
Electronic ballasts power the low-pressure amalgam lamps. Isolated in pure quartz sleeves, the lamps are easily changed when the computer notifies the operator that their 16,000-hour life is over. A sensor monitors UV intensity. An automatic wiper on the reactor cleans the quartz sleeves. The entire lamp assembly removes for maintenance. 804/756-7600; www.degremont-technologies.com.
Gas Chlorinator
The REGAL gas chlorinator from Chlorinators Inc. provides a consistent chlorine residual, eliminating guesswork. Its all-vacuum system virtually eliminates gas leaks. It is directly mounted with a strong yoke. It has a tough and resilient diaphragm and is made with corrosion-resistant materials. The chlorinator is hand-assembled and tested before shipment. With only 68 parts, it is easy to maintain and clean. 772/288-4854; www.regalchlorinators.com.
Eliminates contamination
The InLine+ disinfection system from Aquionics Inc. uses computational fluid dynamics (CFD) software and performance verification biological data to optimize efficiency for all wastewater applications. An improved UV monitor provides accuracy and longer life between factory recalibrations.
The cleaning mechanism removes difficult deposits on the quartz sleeves and monitor probe. The chamber has a compact footprint and minimizes head loss. The improved, optional UVTronic allows remote factory diagnostics of on-site problems. It controls energy consumption by monitoring the dose based on flows, ultraviolet intensity, and transmission of wastewater. The closed-vessel medium pressure lamp design limits photoreactivation and microbial regrowth. 859/341-0710; www.aquionics.com.
Microwave UV technology
The MicroDynamics Series OCS 660 open-channel wastewater system from Severn Trent Services meets all dose, log reduction, and water quality requirements. The technology uses microwaves to energize low-pressure, high-output lamps. The lamps have no electrodes for longer life, increased efficiency, safety and flexibility in design. They light instantly and switch on and off to match flow. The quartz sleeve remains the same temperature as the water, resulting in less fouling. 866/646-9201; www.severntrentservices.com.
Chlorine analyzer
The RPH-250, a reagentless probe-style residual chlorine analyzer from Hydro Instruments, measures free chlorine, total chlorine or chlorine dioxide. The unit has temperature compensation, two selectable 4-20mA outputs, a 4-20mA input for flow meter signal, an alarm relay, and a complete proportional-integral-derivative control program that technicians enable or disable in the field.
Other features include transparent flow cells, a sample-water pressure relief valve, pressure gauge, sample flow rate valve, graduated meter tube, and 25 feet of sample water tubing. The analyzer has automatic pH compensation software for free chlorine. The pH probe is optional. 888/384-9376; www.hydro instruments.com.
Operator-free performance
OSEC on-site hypochlorite generation systems from Siemens Water Technologies produce sodium hypochlorite on-site and on-demand through the electrolysis of a brine solution. Standard unit capacities are 12 to 2,000 pounds of equivalent chlorine per day, and they require minimum maintenance.
Adding more units increases system capacity. Generators eliminate dependence on commercial chemical supplies and the concerns inherent in the transport, handling and storage of chlorine gas and purchased hypo-chlorite. Since the system produces hypochlorite on-demand, it does not degrade in storage. The generators have safety alarm interlocks and flexible configurations to fit available space. 856/507-9000; www.water. siemens.com.
No hazardous chemicals
On-site hypochlorite generators from Miox Corp. are designed to lower operating and maintenance costs. Operators set a specific dosage rate and only the rate of injection varies with the flow, reducing chlorine-dosing requirements. A stabilized dechlorination feed rate eliminates constant monitoring and adjustment.
The system reduces total coliforms and produces a maintainable chlorine residual for reuse applications, keeping long pipelines free of biofilm. The discharged effluent has lower chlorine levels, and since no hazardous chemicals are used, facilities do not need a special risk management plan or safety program. 505/343-0090; www.miox.com.
Effective alternative
The Constant Chlor Plus Model MM-1S feeding system from Arch Chemicals Inc. is an alternative to liquid bleach and chlorine gas. The feeder uses NSF Standard 60-listed dry calcium hypochlorite briquettes and spray technology to automatically deliver an accurate dose of 40 pounds of liquid available chlorine (AVCL) per day.
The fresh-made reservoir is filled with 1.7 percent AVCL solution, and volume is maintained by an electronically controlled spray manifold. A recirculation pump and nozzle mix the solution and keep solids in suspension. A positive displacement chemical metering pump then injects the fresh liquid hypochlorite solution.
The unit, operating at normal atmospheric pressure, is refilled and cleaned while in service. The feeder has a footprint of less than 20 inches in diameter and requires no storage tanks or secondary containment. 800/478-5727; www.archwaterworks.com\municipal.
On-site, on-demand
Klorigen generators from Electrolytic Technologies Corp. safely and cost-effectively produce chlorine gas, sodium hydroxide and sodium hypochlorite at the point of use in systems with output volumes of 100 to 2,500 pounds per day. Chlorine gas is generated on-demand at ambient (1 bar) pressure.
Units simultaneously produce chlorine gas, sodium hydroxide and sodium hypochlorite up to 12 percent. NSF-certified components require less than one hour per day of operator involvement. The generator’s modular design facilitates future expansion, and units are easily fitted with or adapted to SCADA control systems. 305/655-2755; www.electrolytic technologies.com.
