| Project/Area Number |
09680553
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
環境保全
|
|---|
| Research Institution | KANAZAWA INSTITUTE OF TECHNOLOGY |
|---|
Principal Investigator |
YASUDA Masashi KANAZAWA INSTITUTE OF TECHNOLOGY,PROFESSOR, 工学部, 教授 (00089012)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
SUZUKI Noriyuki KANAZAWA INSTITUTE OF TECHNOLOGY,ASSOCIATE PROFESSOR, 工学部, 助教授 (40196853)
|
|---|
| Project Period (FY) |
1997 – 1998
|
| Project Status |
Completed (Fiscal Year 1998)
|
| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1998: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1997: ¥1,400,000 (Direct Cost: ¥1,400,000)
|
|---|
| Keywords | ACTIVATED SLUDGE PROCESS / BIORING WITH CORE / ATTACHING MATERIALS / DECREASE OF WASTING SLUDGE / PROTOZOA / METAZOA / TOC LOADING / 後生動物 / 芯入り紐状担体 / 限界増殖領域運転法 / TOC負荷率 |
|---|
| Research Abstract |
The purpose of the research is to develop a new maintenance method of activated sludge process which needs not wasting its excess sludge. Recently in Japan a suitable site of a landfill for the disposal of sewage sludge becomes limited according with the increasing of the construction of sewage treatment plants. A new biological medium on which the Protozoa and Metazoa can live and play as predators on the bacterial flora is set in the aeration reactors. The medium is made of veniliden chloride and coiled on the metallic line, with a great number of woven rings.
The apparatus is consisted of four reactors and settling tanks, and supplied with artificial wastewater of skim milk. The volumes of each tanks are about 1.8l and 3.0l, respectively. The experiments are performed with changing the condition of the TOC loading and surveyed about efficiencies of TOC and nitrogen removal and MLSS concentration and the number of the Protozoa in the process.
As results the TOC efficiency is above about 97% on the TOC loading of 0.3 6-2.3gTOC/l/d in the new process. The SS concentration in effluent is not thought to be wasting of sludge from the reactors because its SRT is calculated as about 110 days.
Coefficient factors between the MLSS concentration and the TOG loading, as well as the number of the Protozoa and the MLSS concentration are clarified owing to the population dynamics.
Nitrogen concentration increases from the first to fourth reactors due to Predator's taking sludge as well as the self-oxidation of sludge. However, the nitrogen concentration in effluent does not increase owing to high efficiencies of both nitrification and denitrification in the process.
|
