IP Library › Granted Patent US 7,842,185
Granted Patent B2
US 7,842,185 · App. 11/725,486 · Granted Nov 30, 2010

Pellets comprising sludge containing nitrifying bacteria for treating wastewater

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Quick Facts
Patent No.
US 7,842,185
App. No.
11/725,486
Granted
Nov 30, 2010
Kind
B2
Abstract

Entrapping immobilization pellets in which microorganisms are entrapped and immobilized, the entrapping immobilization pellets comprising entrapped and immobilized purified water sludge containing nitrifying bacteria.

Claims (7)

1. Pellets, comprising entrapped and immobilized sludge containing nitrifying bacteria, the sludge obtained from purifying water

wherein:

the entrapped and immobilized sludge has a VSS/SS ratio of 0.1 to 0.3, a VSS concentration of 0.2 weight % to 2 weight %, an SS concentration of 2 weight % or more, and an average particle size of 10 μm to 30 μm.

2. Wastewater treatment equipment, comprising:

the pellets according to claim 1 in a treatment tank.

3. A wastewater treatment process, comprising:

introducing the pellets according to claim 1 into a treatment tank to treat wastewater.

Assignments (1)
MERGER Recorded Mar 4, 2014
From: HITACHI PLANT TECHNOLOGIES, LTD.
To: HITACHI, LTD.
Reel/Frame 032384/0877 →