Since the late 19th century the Parot company has been drawing a source of naturally fizzy mineral water at Saint-Romain-Le-Puy in the Loire region of France. It markets two brands for the supermarket sector: Puits St Georges and Parot.
In addition, the Parot company has developed a range of sweet fizzy drinks in the form of natural or flavored lemonades and colas.
The various stages in the production line generate effluents containing organics, primarily sugar based. In addition, the effluents contain wash water from conveyors and machines and excess drink mixtures. Valve water and wash water from the iron removal plant's filters is also collected. Rainwater was drained off separately.
The factory is located in a light industrial zone and the municipal wastewater treatment plant is not in a position to accept and treat the effluent.
The natural environment consists of a network of brooks and streams that flow into the Merderet River which flows, in turn, into the Loire River a few kilometers further along.
Due to the nature of the specific goals that needed to be met, the Parot company chose the BIOSEP™ from Veolia Water Solutions & Technologies (VWS).
The industrial effluent treatment plant has been operating since early 2002 and maintains a residual COD range of 30 to 60 mg/l and a virtual absence of suspended matter.
The sludge that is produced is centrifuged then limed before being distributed to several farmers under a strictly controlled sludge land disposal plan.
Solutions and technologies
Using BIOSEP™ to treat industrial effluent
Biosep™ is an innovative process developed by Veolia Water STI, a VWS subsidiary, for the biological treatment of industrial effluent.
Biosep™ combines two tried and tested technologies:
A compact system, Biosep™ produces little biological sludge and as a result of high kinetics provides robust carbon and nitrogen purification.
| Pollutant flows to be treated | Constraints of the receiving environment |
|---|---|
COD : 300 kg/d (1,500 kg/weekly) |
COD ≤ 70 mg/l |
BOD5 : 200 kg/d (1,000 kg/weekly) |
BOD5 ≤ 25 mg/l |
SM : 2 kg/d (10 kg/weekly) |
SM ≤ 35 mg/l |
Fe : 2 kg/d (10 kg/weekly) |
Fe + Al ≤ 5 mg/l |
N : negligible |
N ≤ 10 mg/l |
P total : negligible |
P total ≤ 2 mg/l |
Volume : 330 m3/d (1,650 m3/weekly) |
