Method of monitoring treating agent residuals in water treatment processes
AssigneeNalco Company
InventorBrian S. Johnson
Life of this patent
Estimating the term…
Abstract
A method of monitoring residual treating agent in treated water wherein fluorescent tracers are used to determine the concentration of treating agent in the water at two different treating agent dosages and the difference in the measured concentrations of the fluorescent tracer at the respective doses are correlated with the residual concentration of the treating agent. The fluorescence response at the different treating agent dosages is used to determine whether the system is overdosed or underdosed on a continuous basis and to control treating agent dose accordingly.
Claims23
A method of monitoring residual treating agent in water treatment process water comprising
- i) adding a first dose of a treating agent traced with a fluorescent tracer to a first sample of the process water,
- ii) measuring the fluorescence response of the first sample of the process water,
- iii) adding a second, different dose of the treating agent traced with the fluorescent tracer to a second sample of the process water;
- and
- iv) measuring the fluorescence response of the second sample of the process water, wherein the residual concentration of the treating agent is estimated using the change in measured concentration of the fluorescent tracer at the respective treating agent doses using a function of the difference between the fluorescence quenching expected and the fluorescence quenching detected.
A method of monitoring filter aid residuals in treated water in a reverse osmosis pretreatment program wherein the water is treated with one or more filter aids to form a mixture of coagulated and flocculated solids and at least a portion of the coagulated and flocculated solids are removed from the water prior to filtration through a reverse osmosis membrane comprising
- i) adding a first dose of a filter aid traced with a fluorescent tracer to a first sample of the water to form a mixture comprising water, coagulated and flocculated solids and filter aid traced with a fluorescent tracer;
- ii) separating at least a portion of the coagulated and flocculated solids from the first sample of the water;
- iii) measuring the fluorescence response of the first sample of the water;
- iv) adding a second, different dose of the filter aid traced with the fluorescent tracer to a second sample of the water to form a second mixture comprising water, coagulated and flocculated solids and filter aid traced with a fluorescent tracer;
- v) separating at least a portion of the coagulated and flocculated solids from the second sample of the water;
- vi) measuring the fluorescence response of the second sample of the water;
- and
- vii) using the fluorescence response at the respective filter aid dosages to estimate the residual concentration of the filter aid.
A method of monitoring residual treating agent in solid-liquid separation process water comprising
- i) adding a first dose of a treating agent traced with a fluorescent tracer to a first sample of the process water,
- ii) measuring the fluorescence response of the first sample of the process water,
- iii) adding a second, different dose of the treating agent traced with the fluorescent tracer to a second sample of the process water;
- iv) measuring the fluorescence response of the second sample of the process water;
- and
- v) using the fluorescence response at the respective treating agent dosages to estimate the residual concentration of the treating agent.
Dependencies are inferred from the claim text.