When talking about wastewater, we should in fact consider different types. Indeed, the type of contamination and the level of concentration of contaminants vary according to the category of water considered.
The agricultural world and food processing industries generate wastewater. These waters are biodegradable and generally do not contain toxic substances. Most of the contaminants are of organic origin. They are characterized by their BOD (Biological Oxygen Demand) and their concentration of dissolved solids and particles in suspension. BOD is the amount of oxygen required by aerobic water microorganisms to oxidize organic matter, dissolved or suspended in water. It is therefore a biological process.
Waste water types
There are different types of water:
➢ Dairy industry wash water
➢ Slaughterhouse wash waters that are highly concentrated in blood and body fluids. These waters frequently contain medicinal and chemical substances: hormones, antibiotics, and pesticides against parasites.
➢ Water used in the production of cheese
➢ Water used for washing vegetables (canning industry for xample), in which pesticides can be found.
➢ Fruit processing effluents (e.g. cranberry)
➢ Water used to process meat based foods
➢ And in general waters playing a role in the food processing. These waters include salts, dyes, fats, acids and alkalis.
Numerous companies in the food processing sector have to purify their wastewater before discharging into the environment (directly, or via a network).
However, there are exclusions:
- Industrial plants with networked discharges.
- Companies which discharge waste water by infiltration into the ground (septic tank followed by purification) this type of waster water is not discharged into water courses or spread on fields.
- Fish farms.
- Fish and marine product processing companies with discharges into the marine environment.
Solugen is active in the treatment of industrial and food processing water. The benefit of the solution lies in the fact that the water to be treated goes first through a process of consisting in separating the solid fraction from the liquid .
The liquid fraction is then purified by an evapo-distillation process. The result is pathogen-free water and a liquid concentrate containing various elements (N, P, K and others). Residual sludge and liquid concentrate can be used for further processing and can be spread on fields, depending on their fertilizer value. Non-recyclable sludge can be sent to suitable treatment centers. The environmental and economic benefits are obvious.