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OCETA Environmental Technology
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The Trojan System UV4000™ is a modular, open channel, self-cleaning UV technology for disinfection of primary, secondary and tertiary effluent, or combined sewer overflows and stormwater. The use of ultraviolet (UV) light was established by Trojan Technologies Inc. as a safe and cost-effective alternative to chlorination for disinfection of wastewater. Over 1,000 Trojan Municipal Systems are in operation around the world.
Ultraviolet light disinfects wastewater by altering the genetic material in cells so that bacteria, viruses and other microorganisms can no longer reproduce. In UV disinfection systems, the UV light is produced by germicidal lamps which are submerged in an open channel. As the wastewater flows past the UV lamps, the microorganisms are exposed to a lethal dose of UV energy. The UV dose is measured as the product of UV light intensity times the exposure time within the UV lamp array.
System UV4000 was developed to overcome the limitations of conventional low intensity UV systems, which require up to several thousand lamps for high volume applications, particularly when treating low-quality wastewater such as primary effluent, combined sewer overflows and stormwater, or wastewater reclamation and reuse. Table 1 shows the key features of System UV4000.
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General applications of the Trojan System UV4000 include:
Trojan Municipal Wastewater UV Disinfection Systems, using all generations of the UV family (the UV 2000, 3000 and 4000), with sizes ranging from 25,000 gallons/day (9.45 m³/hr) to 212 million gallons/day (33,390 m³/hr), are in operation world-wide. The majority of these plants produce an effluent quality of 30 mg/L of SS and BOD. A fecal coliform count of 200/100 mL thirty-day geometric average is being met by Trojan System UV2000 and System UV3000, as well as the more stringent California Title 22 regulation of 2.2 total coliform/100 mL seven day moving median.
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This technology is based on an open-channel architecture, eliminating the need for pressurized vessels, piping and pumps. UV lamps are arranged horizontally and water flows parallel to the lamps for optimized hydraulics. Multiple banks of UV lamps are placed in series in each UV channel. Typical installations have two banks in series or four banks (one redundant) for wastewater reclamation projects. The size of the system, for a particular application, depends on effluent quality and flow rates, level of disinfection required, and degree of equipment redundancy desired. Figure 1 shows the system in operation. Figure 2 shows a typical System UV4000 configuration.
Figure 1: Trojan System UV4000 in operation
Figure 2: Typical configuration of System UV4000
Two significant advancements, distinguishing System UV4000 from its predecessors, are the use of variable output, high-intensity UV lamps, and the incorporation of automated, self-cleaning technology.
The use of high-intensity UV lamps reduces the total number of lamps required by more than 90%, resulting in reduced space requirements and decreased installation costs. High-intensity UV lamps also extend the range of UV disinfection to lower quality effluents.
Cleaning of the quartz sleeves, which protect the UV lamps, is done by an aggressive combination of mechanical and chemical methods without interrupting normal operation. Cleaning cycles are activated by a timer or UV light sensors and are programmed to perform sequential cleaning of all modules within each operating bank. The cleaning cycle is programmed for each installation and is set as frequent as once per hour, depending on the rate of fouling. Removal of the UV modules from the channel is unnecessary except for periodic lamp replacement. When a lamp is to be replaced, a removal device is used to raise the height of the UV bank to a working level. A single operator can replace a lamp in minutes.
Trojan Technologies Inc. is a high technology company specializing in ultraviolet disinfection of water and wastewater. Trojan has developed a complete range of UV disinfection systems. In the industrial field, Trojan has delivered hundreds of UV systems to clients in industry and government. Its small residential/commercial UV systems presently provide bacteria-free drinking water to over 100,000 households world-wide.
Since 1976, Trojan has been providing solutions to the environmental problems of microbial and toxic pollution through research, product development, systems design, marketing, manufacturing and service. Its Project Engineering Group generates computer optimized designs for municipal wastewater treatment plants, drinking water systems, and specific industrial applications. All systems are designed to meet local regulatory requirements, including those of the US EPA, Canadian Ministry of the Environment and Energy, and the New Zealand Department of Health. Ongoing maintenance or service of its products is provided on either a local or regional basis. Overseas agents stock and service all equipment sold by Trojan.
Profile Print Date: 02/96
Catalogue # 03-002
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