What are common methods that utilize the UV lamp?

Document ID

Document ID TE7389

Published Date

Published Date 06/05/2017
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Question
What are common methods that utilize the UV lamp?
Summary
Methods that utilize the UV lamp.
Answer

Organic Constituents (UV 254 ): 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 absorbencies 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 Absorbencies) to ensure that disinfections 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 hum ic substances and a less potential for TTHM's to form.   The UV absorbencies method provides the absorbencies value required by the SUVA calculation:

SUVA = UV 254 / DOC (dissolved organic carbon)*100

 

UV 254 Transmittance: Water and wastewater plants using UV lamp technology for disinfections must verify the effectiveness of UV lamps as the plant effluent changes over time. In some states the verification of the online UV disinfections must be carried out with a stand alone laboratory UVT method.  Facilities 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 Absorbencies 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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