Claims
- 1. A method of treating wastewater to improve nitrification as an integral single sludge process, said method comprising:
- (a) mixing incoming wastewater with an activated sludge biomass of heterotrophic bacteria and aerating and mixing the mixture;
- (b) allowing the heterotrophic bacteria to absorb substantially all carbonaceous material in the waste water; and thereafter
- (c) passing the wastewater/biomass mixture over plurality of substantially submerged fixed biological support means which have autotrophic nitrification bacteria disposed thereon.
- 2. A method according to claim 1, wherein the method is carried out at a temperature in the range 7.degree. to 33.degree. C.
- 3. A method according to claim 1, wherein the method is carried out at a pH range of 6 to 9.
- 4. A method according to claim 1, wherein the fixed support means are selected from the group consisting of plates, a packing material, honeycomb structures, ropes and beads suitable for supporting fixed biological growths.
- 5. A method according to claim 1, wherein the wastewater/biomass mixture is aerated while being passed over the substantially submerged fixed biological support means.
- 6. A method according to claim 1, wherein the method is conducted in a tank.
- 7. A method according to claim 1, wherein the container is an oxidation ditch, and the plurality of fixed support means is disposed in a downflow portion of the ditch.
- 8. A method according to claim 1, wherein the fixed biological support means are completely submerged in the wastewater.
- 9. A method for improving nitrification in a single sludge process in which waste water is treated by the combination of steps which consists essentially of:
- (a) mixing incoming wastewater with an activated sludge biomass of heterotrophic bacteria and aerating and mixing the mixture;
- (b) allowing the heterotrophic bacteria to absorb substantially all carbonaceous material in the waste water; and
- (c) passing the wastewater/biomass mixture over a plurality of substantially submerged fixed biological support means which have autotrophic nitrification bacteria disposed thereon.
Parent Case Info
This is a continuation of application Ser. No. 07/761,499, filed on Sep. 18, 1991, which was abandoned upon the filing hereof.
US Referenced Citations (4)
Foreign Referenced Citations (2)
Number |
Date |
Country |
60-118292 |
Jun 1985 |
JPX |
2011795 |
Jul 1979 |
GBX |
Continuations (1)
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Number |
Date |
Country |
Parent |
761499 |
Sep 1991 |
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