Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1990-02-13
1991-09-03
Wyse, Tom
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210724, 210726, 210764, 210 961, 210143, 2101951, 210205, 210251, 210258, 21033301, 210340, 210912, 210928, C02F 162
Patent
active
050452134
ABSTRACT:
Waste water treatment for the removal of heavy metals is optimized by continuously removing and filtering a sample flow of treated waste water subject to pH level control to determine the presence of remaining metals in solution to be precipitated. Filtering of the sample removes metals precipitated by pH level control. Optimized pH level control can cause precipitation of most non-chelated and/or non-complexed metals, so that controlled feeding of a precipitating agent, preferably a calcium dithiocarbamate, to the treated waste water is effectively determined by only those metals remaining in solution, which are typically either chelated and/or complexed heavy metals. The filtered sample is injected with a diluted solution of the precipitating agent, and then a turbidity meter is used to determine the degree of turbidity of the injected clear sample. The resulting degree of turbidity corresponds to the level of precipitation caused by injection of the diluted precipitating agent. The precipitation level is in turn in direct correspondence with the level of remaining metals in solution. Differentiation between types of metals for control of feeding of the precipitating agent to the waste water permits optimized use of the precipitating agent, and minimized sludge production accompanying use of the precipitating agent.
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Southern Water Treatment Company, Inc.
Wyse Tom
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