Case study / Quarzite filter purification

Specific needs of water treatment for irrigation or micro-irrigation in agriculture require systems that use layers of quarzite. The filtration process takes place with the water flow from high to low passing through the layer of grit that blocks the pollutants such as sospended solids in the water.
The Quarzite Filters are also especially indicated for the Purification of Carwash Wastewater. In fact when the water passes through the filtering material from high to low, the Quarzite layer blocks the pollutants such as Suspended Solids thus eliminating water turbidity. The substances are gradually held until arriving at the layer below and filtering effectiveness gradually increases as the liquid flows downwards.
Basically the same natural process that takes place when water seeps through the layers of soil before reaching the underground stratum. This allows the Wastewater to be reused in work processes that do not necessitate particularly pure water, for example in the first phase of high pressure washing. In fact this phase of work uses a great amount of water (about  80/90 % of the total) and therefore makes it particularly indicated for economising costs of Carwash Management.

Being a static rainwater filtration system, it is practically suitable for any type of water filtration coming from:
•    Contaminated rainwater leaching
•    Carwashes
•    Farms for Wastewater reuse in agriculture (micro-irrigation systems)

Level of filtration
Equal to a filtration of 100 µ.
Guarantees small particle filtration such as:
•    alghe
•    micro-organisms
•    organic material
•    colloids

Filtration operation
1.    The water to be filtered is forced from above (maximum operating pressure 8 bar) and drops onto of a layer of grit.
2.    Water flows by gravity through the Quarzite layer. The substances are gradually withheld as the sludge moves down and the efficiency of the successive layers increases.
3.    The filtered water is channelled inside the filtering arms and conveyed into a pipe.
4.    The water comes out perfectly filtered and ready to use.

Filtration efficiency depends upon the speed with which the water flows through the layer of grit. The slower the flow, the better the filtration.

With a correct use and sizing, maintenance is practically inexistent. The forced backwash system cleans and regenerates the Quarzite layer that still needs to be substituted over time. The time needed for the complete substitution of the Quarzite depends on the condition of the filter and the type of water to be treated.

Quarzite substitution
It is normally recommended to substitute the Quarzite completely, because over time it tends to roll up as it becomes smooth and blocks the micropores deposited on the bottom (decrease in flow rate).
Once having emptied the sand from the filter it is important to thoroughly clean the nozzles where the air passes for the backwash, if they need to be cleaned or replaced due to minor damage, afterwards check if  the nozzle holder plate is perfectly level with the supports.


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