Method and apparatus for treating water used for washing agricultural products including coagulation and ozone treatment
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United States of America Patent
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Oct 1, 1996
Grant Date -
N/A
app pub date -
Jul 27, 1994
filing date -
Jul 27, 1994
priority date (Note) -
Expired
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Abstract
A method and apparatus for washing agricultural products generates and purifies a wastewater. The wastewater is fed to a first coagulation compartment. A first compartment overflow contains a relatively higher amount of the coagulant and of coagulated contaminants than does the first compartment underflow. The first compartment underflow is fed to at least a second coagulation compartment. A compartment overflow and a compartment underflow are provided in the second compartment and in any successive compartments. The compartment overflow contains a relatively higher amount of the coagulant and of the contaminants than does the compartment underflow. A source of ozone is generated by an ozone generator. The compartment underflow from the last of the coagulation compartments is treated with ozone so that ozonized final compartment underflow provides a source of de-contaminated wastewater. The final compartment underflow is recycled to wash the agricultural products, and the final compartment overflow is again treated with coagulant and processed to remove contaminants.
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