VenturiPulse

Lakes that require remediation are often eutrophic or even hypertrophic, which indicates an excess of nutrients, especially phosphate. This leads to too much biomass forming in the upper layer of water, which consumes oxygen as it decomposes in the lower layer. This can result in the lake becoming oxygen-free at depth, which leads to the death of organisms that require oxygen. Toxic anaerobic decomposition products such as hydrogen sulphide and ammonia can form, and digested sludge develops on the lake bed. The phosphate it contains remains problematic, as it does not form an insoluble compound with trivalent iron and its fertilizing capacity is retained despite mixing, which is known as “tipping over” the lake. The enrichment of oxygen in bodies of water can prevent a body of water from tipping over.

• This is clearly explained in this video: Lake ecosystem – eutrophication

The ambient air is introduced directly into the water through the near-surface ventilation. This creates a fine bubble pattern that promotes oxygen enrichment in the water. These bubbles spread over a larger area and create slight waves that raise the surface of the water. This contributes to additional oxygen enrichment. As a result, survival zones for aquatic organisms are initially created in which sufficient oxygen is available. Over time, the oxygen content in the entire body of water increases and the overall water quality improves. Extensive experience in use has shown that this method of water aeration with a supply of up to 4000 l/min of ambient air is significantly more efficient than the suction of water, which is directed through hoses as spray water onto the water surface.

It is advisable to use at least two water aerators at the same location, which introduce ambient air in different directions in order to enrich zones with ambient air. Water aeration is particularly recommended at times of day when there is no sunlight, as photosynthesis then stops and less oxygen is enriched in the water. Ideally, it should be started before dusk. However, this should be done in close consultation with the relevant authorities or water boards.

The suction side of the pump used should never point towards the bottom so that bottom particles are not sucked in and distributed in the water. This prevents damage. This also ensures that no digested sludge is sucked in. The water aerator is only suitable for near-surface water aeration. The ideal operating depth is between 0.5 and 2 meters. With deep aeration, there is otherwise a risk of harmful substances such as hydrogen sulphide being washed out and stirred up. The water outlet of the water aerator should ideally be parallel to the floor – and should never be directed towards the floor. Otherwise there is a risk of the soil being washed out and sediments being stirred up.

The use of the water aerator creates a recoil on the outlet side of the aerator, which must be absorbed, otherwise the pump and water aerator may make uncontrolled movements. Depending on the ambient conditions, the recoil can be successfully absorbed by the following measures. The first option is to be preferred if possible:

• Use of ground pegs, lantern irons or equivalent functional parts to secure the pump to the ground or to restrict the movement of the pump
• Use in the paved bank area (stones)
• In certain cases, a lattice box or similar container may be suitable for lowering the pump with water aerator

The water aerator alone has already been successfully tested with the following pumps:

• Wilo-Drain TP 100E
• Spechtenhauser Pumpen GmbH Model: Chiemsee A
• Spechtenhauser Pumpen GmbH Model: Chiemsee B; with reduction Storz A to B

The VenturiPulse works with all pumps that have the same or better technical data than the Chiemsee B. Pumps with higher specifications than the Wilo-Drain TP 100E must not be used with VenturiPulse. Use is at your own risk. More information can be found in the operating instructions. However, we are always endeavoring to test and safely release further pump models.

Please ask us about the models you require. If there is sufficient demand, we will be happy to test them!

As a rule of thumb, the greater the volume flow, the more ambient air is drawn in. In addition, the pump used must have at least one Storz B coupling. With the Wilo, up to 4000 l/min of ambient air can be supplied with a B suction hose and up to 2400 l/min with a C suction hose.

The water aerator is only suitable for near-surface water aeration. The ideal operating depth is between 0.5 and 2 meters. With deep aeration, there is otherwise a risk of harmful substances such as hydrogen sulphide being washed out and stirred up.

• PVC suction hose or equivalent or higher quality suction hose with Storz C coupling on both sides; optionally with strainer on a Storz C coupling to minimize contamination and injuries
• PVC suction hose or equivalent suction hose with Storz B coupling on both sides
• Reducer from Storz A to B
• Reducer from Storz B to C

We will be happy to advise you on which accessories you need for your specific application. You can often use materials that you already have in your office anyway.

It is strongly recommended that the responsible water authorities and/or water boards are involved in every operation and that the procedures are coordinated with each other! You should also find out about any other contacts that should be involved in your region.

Yes! The VenturiPulse has already been used successfully to prevent water from tipping over. You can find an example of a THW Pfaffenhofen operation here: Water aerated: Fish mortality prevented