Water Quality and Filtration Abstracts

​CONVERTING OXYGEN-FED OZONE SYSTEMS TO AIR-FED OZONE SYSTEMS

Andy Aiken, National Aquarium Institute
​John Gaudaur, Ozone Water Systems


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Full Abstract

Oxygen-fed ozone generators, while smaller in footprint, consume more energy than to air-fed generators; and can create gas imbalance problems. The authors will present cost-versus-payback scenarios to convert an oxygen-fed system to air-fed system; and discuss gas imbalance problems that can occur. Simplified operations and upkeep are also discussed.

ANALYSIS OF NUTRIENTS IN FRESH AND HIGH-SALINITY WATER BY ION CHROMATOGRAPHY

Dr. Jay Gandhi,
​Metrohm USA


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Full Abstract

A growing concern has been placed in recent years over the water quality associated with nutrient levels in several types of high salinity water that are vital to the marine life, large aquariums and fish/shrimp farms. Excessively high concentrations of nitrite, nitrate and phosphate have shown to deplete oxygen and pose adverse effects on these salt water species. However, routine monitoring of these nutrients in high salinity water matrices remains challenging. In this study, an ion chromatographic (IC) method was developed that has the ability to determine ppb levels of inorganic nitrogen and related anions and Cations, including nitrite-N, nitrate-N, phosphate-P, and ammonia in a single run using a combination of UV and conductivity detectors. The method achieved a good chromatographic separation of common seven anions (including nitrite, nitrate, and phosphate) and five Cations (including ammonium). The detection limit and recovery meets or exceeds previous methods that are applicable only to freshwater. In this presentation, a simple yet robust IC method will be discussed along with data for fresh water and high salinity water.