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Urine and debris passes through an oil-based barrier fluid which
forms the seal to prevent odours reaching the washroom . In some
systems, the barrier fluid is contained within a replaceable cartridge
that also captures debris that would otherwise fall into the waste
pipes. Cartridges typically need to be replaced every 2 to 6 months,
dependent on usage. The barrier fluid can be degraded, and need
replacement, if incompatible cleaning chemicals are used. Otherwise,
barrier systems work very well, although consumable costs may be high
for busy washrooms. Barrier systems are used in several types of urinal
bowls designed exclusively for waterless use, the most well known in
the UK being Armitage Shanks Aridian. The latter model is quite popular in new builds. Another popular system is the Uridan, developed in Denmark, widely used across Europe and Australia, and increasingly popular in the UK.
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PROCESS OF WASTEWATER TREATMENT PLANT : Wastewater enters the treatment plant First it goes through a fine screen, next to aerated grit chamber, and then enters the primary clarifier. Sludge settled in the primary clarifier is sent to the fermenters and then to digesters. After the primary treatment, wastewater flows into (BNR) bioreactors. The activated sludge is separated in the following secondary clarifier. The clear effluent flows into Ultraviolet (UV), then to River. Settled activated sludge in the secondary clarifier is pumped back to BNR. Excess sludge is pumped into the dissolved air floatation (DAF) unit for thickening. Wastewater is collected in sanitary sewers (a complex network of underground pipes). Upon reaching the treatment plant, the wastewater flows through a series of treatment processes which remove the wastes from the...
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