Method of treating suspended solids and heavy metal ions in sewage
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United States of America Patent
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May 16, 2017
Issued Date -
N/A
app pub date -
Oct 14, 2014
filing date -
Oct 14, 2014
priority date (Note) -
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Abstract
A method of treating suspended solids and heavy metal ions in sewage includes (step 1) adding an iron sulfate reagent to a portion of sewage to be treated such that suspended solids therein undergo preliminary precipitation, and then separating the portion of sewage into primarily treated sewage with low turbidity and low density sludge (LDS); (step 2) filling a tank with the LDS, wherein the tank comprises a first inlet and a first outlet above the first inlet; and (step 3) conveying the other portion of sewage to be treated or the preliminarily treated sewage to the tank through the first inlet such that the sewage percolates though the LDS in the tank to fluidize the LDS and bind the suspended solid to the LDS, and in consequence, after percolating through the sludge, the treated sewage exits the tank through the outlet effluent.
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