Projects / Programmes
Procedure development for stabilization, mineralization and hygienization of sludge from small biological wastewater treatment plants
| Code |
Science |
Field |
Subfield |
| 2.02.00 |
Engineering sciences and technologies |
Chemical engineering |
|
| Code |
Science |
Field |
| T350 |
Technological sciences |
Chemical technology and engineering |
Aerobic digestion, anaerobic digestion, autothermal aerobic digestion, nitrification, denitrification, sludge hygienization, sludge mineralization
Researchers (6)
| no. |
Code |
Name and surname |
Research area |
Role |
Period |
No. of publicationsNo. of publications |
| 1. |
12021 |
PhD Magda Cotman |
Chemistry |
Researcher |
2004 - 2007 |
370 |
| 2. |
17262 |
Jelka Grdadolnik |
|
Technical associate |
2004 - 2007 |
41 |
| 3. |
17264 |
Matjaž Omerzel |
|
Technical associate |
2004 - 2007 |
50 |
| 4. |
06111 |
PhD Milenko Roš |
Chemical engineering |
Researcher |
2004 - 2007 |
793 |
| 5. |
08248 |
PhD Janez Vrtovšek |
Process engineering |
Researcher |
2004 - 2007 |
254 |
| 6. |
21240 |
PhD Gregor Zupančič |
Energy engineering |
Head |
2004 - 2007 |
167 |
Organisations (1)
| no. |
Code |
Research organisation |
City |
Registration number |
No. of publicationsNo. of publications |
| 1. |
0104 |
National Institute of Chemistry |
Ljubljana |
5051592000 |
20,942 |
Abstract
At biological wastewater treatment excess sludge is generated. Additional treatment of excess sludge is a necessity, because of the possible harmful environmental impact of untreated sludge. The two most important impacts are spreading of pathogenic organisms (possible health hazard) and unpleasant odors due to microbiological activity of unstabilized sludge. The sludge quantity can also be problematic. The amount can add up to 1 cubic meter annually per population equivalent (PE); or 40 kg of dry solids annually per PE. Using stabilization, mineralization and hygienization procedures, sufficient treatment must be provided: destruction of pathogenic organisms, total stabilization of sludge without chemicals addition and reduction of total dry solids. In Slovenia many small wastewater treatment plants will be built in the coming years, due to the settlements dispersion in Slovenia these will treat about 60% of all wastewater produced. Sludge treatment in small wastewater treatment plants using conventional methods is either insufficient or uneconomical. Therefore on National Institute of Chemistry we will develop a process, which will incorporate all contemporary approaches and research methods. All criteria for class A sludge will be fulfilled. Also such process will be economically suitable for small wastewater treatment plants. The process will be composed of several stages and phases. First stage is the auto-thermal aerobic sludge digestion; second stage is ordinary thermophilic or mesophilic aerobic digestion; the third stage is phase-sequenced nitrification-denitrification stage composed of aerobic-anaerobic-anoxic phases. The process will be batch-controlled process using air and pure oxygen aeration. Considering the auto-thermal capabilities of the sludge digestion, the process can be optimally controlled in each phase and therefore can reach maximal effect. Considering the heating requirements, the process will be economical, because the required heat is generated in auto-thermal digestion, therefore there are no reactor heating costs. The investment costs are also lower, because the batch technology requires less reactors and space.
