Having a drum filter adapted to the needs of your installation, will guarantee complete fulfillment. It is essential to carry out an upstream study of the characteristics of your installation and the information that needs consideration to determine the selection criteria for the drum filters. However, we recommend that you consult a specialist for advice.
Resistance of the filter mesh
The durability of the filter mesh is an important requirement for a filter system such as a drum filter. This filter can be easily replaced in a filter without cells and filtering panel. However, not all drum filters are of this type. In addition, a poor quality filter mesh would cause the drum filter to lose its self-contained nature, as it will require a lot of maintenance. This maintenance frequency will become especially sensitive, because it is subject to oxidation throughout its use.
Therefore, we highly recommend a stainless steel mesh, with independent and easily interchangeable filter plates. This way, you will reduce the cost of maintenance that you could have with woven mesh.
Filter panel structure
Filter panels are found in drum filters. It provides structural support to the mesh of woven drum filters. However, this is not the case for all models. In fact, some models are welded and have no need for it.
These filtration panels are made from polyethylene, which makes them affordable to purchase. However, the maintenance costs will be much higher than in a stainless steel drum version.
The bearings are the part fixed in the center of the drum, giving it good stability. It requires regular maintenance. To avoid overheating, it is important to grease this part regularly with oil.
If this operation is not carried out, not only will the filter lose its efficiency and develop abnormalities, but it may also cause a total destruction of the device. Such a scenario will have a much greater economic impact.
At 1h2o3, we decided to use a more solid bearing system that requires less maintenance.
b. Training system
The drum filter is operated by the training system. Indeed, it represents an important element of the drum’s rotation mechanism. It can be found as a gear directly in contact with the drum.
Alternatively, belt or chain systems can be found that are less durable and require more maintenance. We therefore recommend the use of the second type of training system, if you want the greatest autonomy for your drum filter.
c. Mesh cleaning
Mesh cleaning must be automatic. However, it occurs sometimes that the mesh becomes dirty after a long period of use and needs additional cleaning. In this situation, it becomes necessary to add manual maintenance.
In addition, it is necessary to add a manual cleaning to prevent the formation of limescale. However, intensive backwash programs are available to prevent such damage.
d. Backwash ramp accessibility
Cleaning the backwash ramp is often simple, but essential. This is because this ramp is often located above the filter, so that the rinsing process deposits the waste directly into the drainage channel.
However, it is necessary to check the pressure of the flushing valves. This check is done manually. All you have to do is pass your hand under the nozzles to check that they all have the same pressure. If any of them have a lower pressure, it probably means that something is blocking the water flow. Such waste may come from filtered water. All you have to do is remove the nozzle cover and clean the inside, using a tool fine enough to penetrate.
There are different backwash modes for drum filters, which can vary in intensity and frequency. This characteristic is one of the important selection criteria for choosing a drum filter.
Scheduled washing, as its name indicates, will be programmed in advance. It is going to intervene in a regular way, to clear the filter of its “cake”. This backwash mode gives your filter a great deal of autonomy, if it is properly programmed for your needs. In addition, it will be very economical with water and will decrease the amount of abrasive rinsing that is required.
Washing is more adaptable to the circumstances. Washing is more adaptable to the circumstances. The more it is used, the faster it will be saturated. Therefore, it happens that the programmed washing is exceeded. As a result, water may overflow. That’s where the pressure sensors come in. As they sense the rising water, they will send a signal to the rinsing nozzles which will clean the drum filter and thus lower the water level.
Some devices, like the 1H2O3 devices, combine these two backwashing modes. To ensure optimal efficiency.
Some drum filters are also equipped with an intensive washing system. This system is very practical for the prevention of limescale formation. It is also found in our drum filter range.
Energy efficiency is a priority because it can be about saving water or saving electricity. Innovation in this sector continues to grow. There are many mechanisms to push this energy efficiency to its maximum.
The advantage of this energy efficiency is that you save money directly, with reduced bills. However, because of the water savings, you will have more concentrated sludge that will take up less space.
These savings can come from a number of sources, as many of the filter’s characteristics (filter panel, gravity or pumping system, etc.) and the settings (backwash duration, backwash frequency) that we assign to it can reduce our consumption.
So, by making the right choice of drum filter for your needs, you will be able to achieve this energy efficiency.
The emergency bypass is a prevention mechanism, integrated on drum filters by some producers. With this innovation, the contents of the drum filter are not spilled.
Indeed, when the drum filter is completely saturated, the water level will rise in the drum filter until it reaches the pressure sensors (some drums are without them). En étant sollicité, ces capteurs vont envoyer un signal activateur aux buses de lavages, afin d’éliminer les déchets qui vont se retrouver dans la gouttière d’évacuation. However, if the pressure sensor malfunctions, the nozzles will not activate. The water level will continue to rise until it overflows. If this happens, there is a risk that the pollutants contained in the water will spill directly into the soil and nearby water sources. The emergency bypass is there to avoid this.
In summary, the emergency bypass is a tank used to hold back water that is expected to overflow and will therefore slow the progression of water, while preventing a spill of a potentially dangerous substance.
Protective hoods (drip, mist, corrosion)
Material choice of the cover is also important in the selection criteria of a drum filter. Indeed, depending on the environment in which it will be found, it will be subject to different hazards. From simple rain, to salty winds your drum filter may be subjected to various threats.
The HDPE type plastic, although light, its main disadvantage will be its low resistance to time, if it is exposed too repeatedly to the vagaries of the weather (mist, drop, etc.), it will suffer a deformation. However, it will stand up well to corrosion.
Stainless steel, while being heavier, will ensure a long life. Especially in the face of bad weather. Il présente donc l’avantage le plus grand. It has the greatest advantage.
UV resistance for outdoor installations
If your filter is being installed outdoors, it will likely be exposed to UV radiation. Some materials are not very resistant to these rays. This is reflected in a change of color, and is mainly aimed at the thinner layers. It is especially important not to leave the screens directly exposed to UV light. This could damage them. Deflectors are available to prevent direct UV from penetrating the screen membrane.
This resistance to UV can be mitigated by adding a waterproof and UV-treated cover (a tarpaulin or plastic wrap). Although simple, this solution remains impractical.