So,
By a system of biological sewage treatment ponds PBS set up a little test site. We simulated a sewage water flow of around 100 litres per hour, which is corresponding to a wastewater treatment/sewage system for about 20 people (counting a standard of 120 litres per person over 24 h). In this case we first collected 800 litres of sewage water from the first pond where water is let out directly from the septic tank/sludge separator, i.e. water with very high content of microbial contamination as well as other pollutants common in sewage water. Then we treated this water with one of our (H)units over given time periods, eg. 4h and 8h, and analysed the samples.
To get a better understanding, please watch this video (Note: I say we simulate a flow from a small household system, which is wrong. It is the above figures that are correct):
We see some very interesting results and proof of concept. Basically, we kill the microbial contamination and reduce the biological and chemical pollution significantly.
In regards of bacterial levels, this heavily contaminated water had after 8 hours of our treatment ”swimming water quality”, i.e. the levels required at shorelines and beaches.
The samples are taken from the flowing water (hose) going back into the raw water tank after it being circulated a certain time.
Here follows an extract:
| Analysed parameter | Untreated reference | PBS treatment 4h | PBS treatment 8h |
| E.Coli (cfu/100 ml) | 35 000 | – | <10 |
| Coliform bacteria (cfu/100 ml) | >100 000 | 4 000 | 99 |
| Intestinal enterococci (cfu/100 ml) | 4100 | – | <10 |
| Color (mg/l Pt) | 100 | 40 | 25 |
| pH | 7.7 | 8.0 | 8.2 |
| Total phosphorus (mg/l) | 1,9 | – | 0.68 |
| Total nitrogen (mg/l) | 30 | – | 27 |
| BOD7* (mg/l) | 40 | – | 18 |
| COD* (mg/l) | 130 | 86 | 61 |
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