Nalco Company

Stephen Bernard Ashton

Laura E Rice

Michael V Enzien

Martin Seifert

The invention is directed towards methods and apparatus for accurately detecting the presence and concentration of an oxidant in a turbid water sample. This method is very helpful in allowing accurate and efficient (not too much nor too little) amounts of microbe killing oxidants to be introduced to water supplies that require oxidants but which at present cannot be measured properly. The method comprises the steps of: passing the water through at least one filter array, passing the filtered water to an analyzer, and then returning from the analyzer a measurement of the concentration. The filter array comprises at least one filter constructed and arranged to remove turbidity inducing material but not oxidant from the water sample. The analyzer can be a commonly commercially available analyzer that currently cannot accurately measure the oxidant concentration if the water had not been so filtered. This method allows users to apply easily available oxidant measuring technology to applications such as paper mill water where it is needed but was previously was not applicable.

Apparatus for on-line continuous chlorine analysis in turbid water and process streams

An apparatus and method for monitoring microbiological activity in a process stream by measuring dissolved oxygen is disclosed. Bulk microbiological activity and surface associated biological activity are measured using this apparatus and method.

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Chester, United Kingdom

Stephen Bernard Ashton