System and method for removal of fluoride from wastewater using single fluoride sensing electrode
First Claim
1. A system for removing fluoride from a flouride bearing industrial wastewater, comprising:
- a reaction tank for processing said wastewater, said reaction tank including a first input for feeding said wastewater into said reaction tank, and a second input for adding calcium salts to said reaction tank to form precipitated fluoride;
a filtration tank for removing said precipitated fluoride from said wastewater, said filtration tank including an output for discharging filtered wastewater;
a single fluoride electrode disposed at said first input of said reaction tank, said single fluoride electrode measuring a concentration of fluoride in said wastewater fed into said reaction tank and providing an output signal; and
a programmable controller for controlling addition of said calcium salts into said reaction tank responsive to said output signal provided by said single fluoride electrode so as to provide a treated output stream of desired quality.
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Accused Products
Abstract
A system for removing fluoride from wastewater is provided. The system comprises a reaction tank for processing said wastewater by adding calcium salts, a filtration tank for removing the precipitated fluoride formed in the reaction tank, a single fluoride electrode disposed at the reaction tank for measuring a concentration of fluoride in the influent wastewater and providing an output signal, and a programmable controller for controlling addition of said calcium salts into said reaction tank. The programmable controller defines a setpoint of fluoride concentration in the reaction tank and automatically controls addition of calcium salts based on the setpoint and the output signal provided by the single fluoride electrode. A method of removing fluoride from wastewater is also provided.
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Citations
19 Claims
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1. A system for removing fluoride from a flouride bearing industrial wastewater, comprising:
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a reaction tank for processing said wastewater, said reaction tank including a first input for feeding said wastewater into said reaction tank, and a second input for adding calcium salts to said reaction tank to form precipitated fluoride;
a filtration tank for removing said precipitated fluoride from said wastewater, said filtration tank including an output for discharging filtered wastewater;
a single fluoride electrode disposed at said first input of said reaction tank, said single fluoride electrode measuring a concentration of fluoride in said wastewater fed into said reaction tank and providing an output signal; and
a programmable controller for controlling addition of said calcium salts into said reaction tank responsive to said output signal provided by said single fluoride electrode so as to provide a treated output stream of desired quality. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of removing fluoride from a fluoride bearing industrial wastewater, comprising:
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defining a setpoint of concentration of fluoride using a programmable controller;
measuring a concentration of fluoride in said wastewater using a single fluoride electrode;
automatically adding calcium salts to said wastewater in an amount based on said setpoint defined by said controller and said concentration of fluoride measured by said single fluoride electrode so as to provide a treated output stream of desired quality. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A system for removing fluoride from a fluoride bearing industrial wastewater, comprising:
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a reaction tank for processing said wastewater, said reaction tank including a first input for feeding said wastewater into said reaction tank, and a second input for adding calcium salts to said reaction tank to form precipitated fluoride;
a filtration tank for removing said precipitated fluoride from said wastewater, said filtration tank including an output for discharging filtered wastewater;
a first single fluoride electrode disposed at said first input of said reaction tank, said first single fluoride electrode measuring a concentration of fluoride in said wastewater fed into said reaction tank and providing an output signal;
a second single fluoride electrode disposed at said output of said filtration tank, said second single fluoride electrode monitoring a concentration of fluoride in said filtered wastewater and providing an output signal; and
a programmable controller for controlling addition of said calcium salts into said reaction tank responsive to said output signal provided by said first and second fluoride electrode so as to provide a treated output stream of desired quality. - View Dependent Claims (18, 19)
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Specification