Waste water treatment units

Industrial floor washing wastewater treatment and recycling

In France, an automotive industry parts manufacturer uses a plastic injection process. All injection molding machines generate an oily residue on the floors every day. It also happens that some hoses and hydraulic circuits can cause an accidental oil spill.

Therefore, our Client cleans his floors daily by using two Nilfisk automatic floor scrubbers. Both cleaning machines work with a mechanical brushing process and by applying a water-based cleaning solution. The fluid is applied to the surface needed to be cleaned is then vacuumed. Once vacuumed, the fluid is now soiled with oil and metal particles. These floor cleaning operations generate 150 to 200 liters of wastewater daily.

Our Client, who doesn’t have a wastewater treatment unit, has to store his wastewater, which is then evacuated on a regular basis by an external service provider. Such storage of contaminants presents an environmental risk and leads to significant costs in terms of logistics and storing.

A semi-automatic microstation and a customized formulation to ensure environment protection

Concerned about the environmental consequences associated with the risks of discharge and environmental pollution, our Client decided to call NISKAE, specialist in the treatment and recycling of industrial wastewater, for a solution adapted for his industrial use. The main goal of this project is to treat the washing water and reuse it. The targeted benefit is therefore multiple, namely the elimination of hazardous storage, the reduction in reprocessing costs, the absence of discharge into the municipal water system and the reduction in water consumption.

Our laboratory has analyzed an initial washing water sample which was generated by the two Nilfisk floor auto scrubbers used. Based on this analysis, several coagulation and flocculation tests were performed to establish the best coagulant-flocculant complex solution. The custom-made formulation made it possible to reduce the concentration of heavy metals without affecting the pH value. The determined water treatment reagent effectively reduced the concentration of heavy metals, such as the iron concentration which decreased from 2.99 mg/L to 0.52 mg/L, as well as the zinc concentration, which decreased from 4.64 mg/L to 0.88 mg/L. The advantage of a specific and custom-made formulation has allowed us, in this case, to limit the dosage of the coagulant-flocculant product to 2 g/L. The implementation of the treatment and the operation of the proposed microstation makes it simple of use.

Following the various steps of analysis and testing, considering the type and volume of our Client’s wastewater, NISKAE offered the installation of a microstation for the treatment and recycling of washing water. The unit chosen is the SW100 model with semi-automatic operation, which allows 100 L treatment batches. Such an installation will be able to treat 300 to 400 L of water per working shift.
The proposed installation is composed as follows,

  • 1 wastewater recuperation tank for emptying of the auto floor scrubbers
  • 1 wastewater storage tank with a capacity of 500 L
  • 1 SW100 water treatment reactor
  • 1 clear water storage tank with a capacity of 500 L. This tank is equipped with a water booster pump and a range of particulate and antibacterial filters for a clean and clear treated water return and at city water pressure.


A solution that is both economic and environmental. Elimination of water storage and a significant reduction in operational costs

By opting for this eco-responsible approach, the Client benefits from a better return on investment within less than a year compared to a waste storage and destruction solution provided by an external service provider. The implementation of a NISKAE treatment unit for its industrial water has permitted our Client to reduce its initial wastewater management costs by 75%. Our solution eliminates the costs of storing and the transport of polluted fluids. This automotive parts manufacturer is now benefiting from a new orientation allowing it to treat and recycle its water!

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