How to purificate your water?

For the purification of discharged water, Enthoven Techniek/Patron Agri Systems developed the Apollo Plus installation. To meet the Dutch 95% purification requirements, the installation device needed to be approved by means of a measurement protocol. The installer expects that the test phase will be completed soon.

The most effective method
Wageningen UR horticulture has done research into the different methods to minimize the residue of plant protection products in discharged water. Ozone, low and high pressure UV, with or without hydrogen peroxide and activated carbon have been researched. Low-pressure UV in combination with hydrogen peroxide and activated carbon was the most effective method.

Low-Pressure UV lamps
Enthoven Techniek already built installations with low-pressure UV lamps. In addition, they have experience with injection systems for hydrogen peroxide. Activated carbon is a new element in purification for the company. An important factor here is the so-called service life, or the duration that the activated carbon continues to actively absorb substances. The installer expects a minimal service life of one year, so the carbon doesn't require replacement sooner. The company is testing standard test water, with different plant protection products, fertilizers and pollution, to estimate the amount of activated carbon necessary.

Optimizing with pump frequency
The UV purification of the installation can be built modularly with UV tubes, so it can be customized. Each UV tube has a capacity of 750 liters/hour at 25% of the T10-value. The Apollo Plus uses UV sensors to determine the optimum flow. As soon as the transparency of the water rises, the flow is regulated with a frequency regulator. This means that the system always makes optimum use of the lamp's burning hours.

Another big advantage of low pressure UV lamps is that moving parts are not required to keep the tubes clean. These are kept clean by means of an acid rinse. The installation decides whether or not it is necessary to clean by means of UV sensors. The tube and water layer are irradiated and the quantity of light breaking through is measured.

Drain- and discharged water treatments
The purification installation with low pressure UV tubes, sand and an activated carbon filter, injection system for acid and hydrogen peroxide runs stand-alone and does not need to be linked to a climate computer. The installation can be used inline, but also for more than one treatment and with different methods. The Apollo Plus installation may also be used to purify drinking water. In that case the hydrogen peroxide and activated carbon filter are not used, but the UV part is.

Source: Glastuinbouw Waterproof

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