Method and apparatus for treating sludge, and method and apparatus for treating wastewater utilizing the same
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United States of America Patent
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Issued Date -
Jan 8, 2004
app pub date -
Dec 16, 2002
filing date -
Jul 3, 2002
priority date (Note) -
Abandoned
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Abstract
Provided are a method and an apparatus for treating organic wastewater and sludge, which remarkably reduce the generated amount of sludge at much lower running cost, and which get the size smaller the capacity of the solubilization tank. The method and apparatus for treating sludge has: an biological treatment system, which applies biological treatment to wastewater, a solid-liquid separation unit for separating a solid from a liquid in the wastewater after treating the biologically, to obtain a treated wastewater and a returned sludge. And the apparatus has means for obtaining a withdrawn sludge from a part of the returned sludge, an alkali-treatment tank, which applies alkali-treatment to the withdrawn sludge. The apparatus, also, has a biological solubilization tank, which solubilizes the sludge after treating the alkali-treatment under an anaerobic, anoxic, or microaerophilic condition, and a means for returning sludge to recycle the solubilized sludge to the biological treatment system.
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