What are common methods that utilize the UV lamp?

Document ID

Document ID TE665

Published Date

Published Date 04/24/2018
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Question
What are common methods that utilize the UV lamp?
Summary
DR 6000 methods that utilize the UV lamp
Answer
Organic Constituents (UV254): Drinking Water facilities need an efficient method for detection of natural organic matter (NOM). Surface Water plants with higher levels of organic material in their source water may have concerns with disinfection by-products when chlorine combines with high levels of NOM. Additionally, the DR 6000 can be a powerful tool for operators who use the UV absorbance method to rapidly assess organic removal when running jar tests to optimize coagulation and polymer dosing parameters.

SUVA Calculation: Drinking Water systems that use conventional filtration must either report their TOC and Alkalinity or can report the SUVA (Specific UV Absorbance) to ensure that disinfection by-products are controlled. Plants are not required to use enhanced coagulation or softening if their SUVA is less than 2.0. A low SUVA shows that there is less humic substances and a less potential for TTHM’s to form. The UV absorbance method provides the absorbance value required by the SUVA calculation:
SUVA = UV254 / DOC (dissolved organic carbon)*100

UV254 Transmittance: Water and wastewater plants using UV lamp technology for disinfection must verify the effectiveness of UV lamps as the plant effluent changes over time. In some states the verification of the online UV disinfection must be carried out with a stand alone laboratory UVT method. Facilites that control lamp intensity with a UVAS probe can benefit from having a verification or backup method using the DR 6000.

UV Nitrate: The nitrate UV Absorbance method can provide an efficient, reagent-free method to monitor nitrate levels. Drinking Water systems with high level of nitrate in source waters will want to screen regularly with a lab or online instrument. For example, the state of Minnesota is conducting a 20 year mapping program for nitrate levels at well sites all over the state using the UV Nitrate method. Facilities can also use the spectrophotometer to verify performance of online Nitratax sensors when used for nitrate monitoring. Additionally, systems that chloraminate can use the low-cost lab method to monitor flushing in the distribution system if required to control nitrification.

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