Project Aim
Improving water quality in Beit Keshet reservoir for use in agricultural irrigation.
The reservoir, with a daily flow of 500 to 2,500 m3, serves for supplementary treatment of wastewater from three surrounding towns. As the quality of the effluent released from the reservoir does not allow its use in agricultural irrigation, a fast and effective solution to improve effluent quality is required.
Our Solution
Improvement of effluent quality by means of advanced oxidation using an ozone-based nanobubble system. Following treatment, the effluent in the reservoir meets the standards of Israel’s Ministry of Health, allowing it to be used for irrigation.
Process Components
-
Two nanobubble floating systems and two ozone generators operating at 50 g/h.
- Two Rio© units to break up effluent layers in the reservoir.
A minimum effluent level of 2 m was maintained in the reservoir.
Results
- Effluent water attained the required quality within two weeks.
- Results indicate a high percentage of pollutant removal within a week of installing the system:
-
- 70% removal of TSS and COD.
- Removal of ammonia and phosphorus.
Treatment parameters: COD, BOD, TSS, TKN and total phosphorus
|
COD(mg/l) |
BOD(mg/l) |
TSS(mg/l) |
|
| Regulatory standard |
N/A |
60 |
90 |
| Before treatment |
380 |
85 |
145 |
| After two weeks of nanobubble treatment |
209 |
35 |
31.6 |
| After four weeks of nanobubble treatment |
172 |
35 |
27 |
The ozone-based nanobubble system is highly effective in removing organic load and suspended solids from the reservoir effluent.
In addition to the quality of the effluent reaching the required value within two weeks, a significant improvement in odour emissions is attained soon after system installation as a by-product of the process.
