Method for treating wastewater and sludge
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United States of America Patent
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Jul 14, 2009
Grant Date -
May 15, 2008
app pub date -
Sep 13, 2007
filing date -
Jul 3, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and an apparatus for treating organic wastewater and sludge which remarkably reduce the generated amount of sludge at a much lower running cost, and which reduce the size and the capacity of the solubilization tank. The method and apparatus for treating sludge employs a biological treatment system, wherein a biological treatment of wastewater is carried out, and a solid-liquid separation unit for separating a solid from a liquid in the wastewater after the biological treatment, to obtain a treated wastewater and a sludge. The apparatus has a means for obtaining a withdrawn sludge from a part of the sludge and an alkali-treatment tank, wherein an alkali-treatment of the withdrawn sludge is carried out. The apparatus also has a biological solubilization tank which solubilizes the sludge after the alkali-treatment under an anaerobic, anoxic or microaerophilic condition, and a means for recycling the solubilized sludge to the biological treatment system.
First Claim
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Family
| Country | kind | publication No. | Filing Date |
|---|---|---|---|
| JP | A | JP2004033927 | Jul 03, 2002 |
| JP | A | JP2004148136 | Oct 28, 2002 |
| US | A1 | US20040004038 | Dec 16, 2002 |
| US | A1 | US20060169637 | Mar 30, 2006 |
International Classification(s)
- 2007 Application Filing Year
- C02F Class
- 686 Applications Filed
- 374 Patents Issued To-Date
- 54.52 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 3 Citation Count
- C02F Class
- 4.09 % this patent is cited more than
- 16 Age
