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Class Information
Number: 210/622
Name: Liquid purification or separation > Processes > Treatment by living organism > Aerobic treatment > Recirculating to prior step > Of separated liquid
Description: Process and wherein supernatant or filtrate is recirculated.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 4651759 |
Start-up process for the thermophilic denitrification of tobacco |
Mar. 24, 1987 |
| 4622982 |
Continuous method of denitrating tobacco extracts |
Nov. 18, 1986 |
| 4572219 |
Process for improving tobacco |
Feb. 25, 1986 |
| 4566469 |
Process for dissimilatory denitrification of tobacco materials |
Jan. 28, 1986 |
| 4500427 |
Activated-sludge process for wastewater treatment |
Feb. 19, 1985 |
| 4500428 |
Method for the treatment of wastewater sludge |
Feb. 19, 1985 |
| 4452699 |
Method of improving the SVI of mixed liquor in aeration tank |
Jun. 5, 1984 |
| 4401569 |
Method and apparatus for treating hydrocarbon and halogenated hydrocarbon contaminated ground and ground water |
Aug. 30, 1983 |
| 4375412 |
Methods for the treatment of organic material and particularly sewage sludge |
Mar. 1, 1983 |
| 4338337 |
Method for recovering and recycling animal waste materials |
Jul. 6, 1982 |
| 4338196 |
Biological treatment of a formaldehyde-containing waste water contacted with a biomass together with a nitrogen compound |
Jul. 6, 1982 |
| 4251359 |
On-site wastewater treatment system |
Feb. 17, 1981 |
| 4244815 |
Process and apparatus for the aerobic biological purification of liquid wastes containing organic pollutants |
Jan. 13, 1981 |
| 4207179 |
Biotreatment using carbon treated recycle and/or clarifier effluent backwash |
Jun. 10, 1980 |
| 4203838 |
Process for the treatment of sludge |
May. 20, 1980 |
| 4193854 |
Heavy metal removal from wastewater sludge |
Mar. 18, 1980 |
| 4190528 |
Process for biological purification of waste water |
Feb. 26, 1980 |
| 4183808 |
Phosphate removal from wastewater |
Jan. 15, 1980 |
| 4183809 |
Process for removing organic substances and nitrogen compounds from waste water |
Jan. 15, 1980 |
| 4181604 |
Process and apparatus for waste water treatment |
Jan. 1, 1980 |
| 4179365 |
Process for treating waste water |
Dec. 18, 1979 |
| 4179366 |
Method for the biological purification of effluent and the plant for carrying out the process |
Dec. 18, 1979 |
| 4163712 |
Treatment of liquid |
Aug. 7, 1979 |
| 4053394 |
Process for separating and converting waste into useable products |
Oct. 11, 1977 |
| 3990967 |
Positive progressive biochemical digestion of organic waste |
Nov. 9, 1976 |
| 3951788 |
Sludge control and decant system |
Apr. 20, 1976 |
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