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The critical factors in water treatment plant performance: How to get more efficient

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article image ILMAP sand filter nozzles are available in 22 different models

Managing Director of Tecpro Australia Graeme Cooper underlines the importance of the filtration system in every water treatment program. It is also necessary to regularly clean the filter using the backwashing process to keep it running at optimum performance levels.

The quality of water output in water treatment plants is determined by how well the filtration system is operating, which in turn depends on the frequency and quality of backwashing processes. 

Over time, the media in a water treatment facility becomes coated and even clogged by particles and debris. Regular filter cleaning is crucial to ensure the system remains efficient and the quality of the water output, sound.   

Backwashing involves shutting down filtration and reversing the flow of water to run backwards through the filter at a higher velocity, which dislodges particle build up. Airflow is sometimes used to amplify the cleaning process, either before or during backwashing with water. 

According to Mr Cooper, typically there are three different approaches to backwashing: While some systems use water only, others use air and water consecutively, or air and water simultaneously. The optimal approach depends on the type and rate of particle build-up in the filter. 

Mr Cooper comments the combination of air and water simultaneously gives the strongest scour rate and therefore a more rigorous clean. During air backwashing, holes in the stem allow air to be pumped into the nozzles from where it flows up through the media helping to dislodge the built-up material. The following water backwash raises the filter media and flushes away all the unwanted material.

Installing nozzles with the correct size air holes (and/or slots) in the stem for air scouring is critical to achieving the right amount of airflow and back pressure. The location, dimensions and number of air holes and slots is another important factor in the design of the filter nozzle. For the nozzle to work effectively it is essential that the air holes and slots are specifically designed to suit the capacity of the backwash air supply.

For instance, nozzles with a short stem without backwash holes/slots are not suitable for air scouring as they will use too much air and cannot guarantee the equal air distribution in the total number of nozzles installed in the filter drain floor. 

Mr Cooper says designing, constructing and installing correct nozzles to suit system demands is fundamental to the effectiveness of water treatment plants. 

Tecpro Australia helps managers responsible for water plant maintenance maximise performance and life from their filters by selecting the right filtration and backwashing nozzle to match their needs.

The ILMAP range of sand filter nozzles, exclusively distributed in Australasia by Tecpro Australia is particularly useful for system upgrades because it is available in 22 different models, eight standard stem lengths, eight types of thread and 10 different slot widths to match the precise dimensions of systems of any age. ILMAP will also manufacture nozzles to individual client specification.

ILMAP sand filter nozzles and accessories are designed and manufactured in Italy.

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