Backflow prevention device

The function of a silt trap is to reduce the presence of debris and silt in trade waste by straining them out of the waste stream.

Silt traps are commonly used on trade waste streams of car washes to remove debris and excessive silt prior to entering a petrol and oil interceptor.

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Marble chip acid neutralising tanks are not suitable for trade waste streams containing sulphuric acid as it creates a layer of calcium sulphate on the chips which is a barrier to further neutralisation of the acid.

Settling tanks are commonly used on trade waste streams from plaster sinks, soil laboratory sinks and construction sites.

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Grease traps are commonly used on trade waste streams produced by food handling businesses (e.g. hot chicken sales, cafes, restaurants, function centres, food manufacturers).

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The function of a silt pit is to reduce the presence of solid particles such as dirt, grit, sand and broken glass in trade waste by straining and settling them out of the waste stream.

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For assistance with trade waste in your business, please contact the team on 1300 771 865 or email [email protected], Monday to Friday, 8:30am to 5:00pm.

Solvent and oil interceptors are commonly used on trade waste streams from laboratory sinks, small troughs for parts degreasing, and silk screen printing.

Silt pits usually discharge to a petrol and oil interceptor at car/truck washes prior to discharging to sewer, see “petrol and oil interceptor”.

Silt pits are commonly used on trade waste streams containing significant volumes of solids (e.g. car washing, bottle washing, truck washing).

It is your responsibility and a requirement of your Trade Waste Agreement to install a grease trap or an appropriate treatment equipment for your business as specified by Yarra Valley Water in your Trade Waste Agreement.

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Petrol and oil interceptors are commonly used on trade waste streams produced by petrol stations, mechanical repair workshops, engine/part washing and car/truck washes.

The function of a petrol and oil interceptor is to reduce the presence of petrol and petrochemical oils in the trade waste stream. Petrol and oil float after the trade waste has had sufficient time to separate inside the interceptor. Remaining wastewater is what the interceptor discharges to sewer.

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The function of a settling tank is to reduce the presence of solid particles (e.g. silt, plaster and stone grindings) in the trade waste stream. Solid particles sink to the bottom of the tank after the trade waste has had sufficient time sitting inside the tank. Remaining wastewater is what the tank discharges to sewer.

The strainer reduces the presence of solid particles in trade waste by straining them out of the waste stream. The pit reduces the presence of particles small enough to pass through the strainer by allowing them to sink to the bottom of the pit after the trade waste has had sufficient time sitting inside the pit. Remaining wastewater is what the pit discharges to sewer.

Straining pits are not suitable for food processing/preparation trade waste streams as the pit is likely to produce odour in that application. For food processing/preparation trade waste streams, see “grease traps”.

The strainer reduces the presence of solid particles in trade waste by straining them out of the waste stream. The pit reduces the presence of particles small enough to pass through the strainer by allowing them to sink to the bottom or float to the top of the pit after the trade waste has had sufficient time sitting inside the pit. Remaining wastewater is what the pit discharges to sewer.

Test sumps are required where it is unfeasible for samples to be taken from the outlet of trade waste treatment equipment or an overflow grate on the disconnector gully or when otherwise required by YVW.

Silt pits are not suitable for food processing/preparation trade waste streams as the pit is likely to produce odour in that application. For food processing/preparation trade waste streams, see “grease traps”.

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Straining pits that are used in applications where the trade waste needs to be cooled down to ensure its below 38C (such as laundries) can be sized so that the pit retains the water for a minimum of 1 hour to cool the trade waste down prior to discharging to sewer.

Petrol and oil interceptors at car/truck washes usually have waste water treated by a silt pit discharging into them for further treatment prior to discharging to sewer, see “silt pit”.

Settling tanks are not suitable for food processing/preparation trade waste streams as the tank is likely to produce odour in that application. For food processing/preparation trade waste streams, see “grease traps”.

Marble chip acid neutralising tanks are commonly used on trade waste streams produced by small laboratories (e.g. school laboratories).

The function of a mixing tank is to reduce the concentration of each trade waste component by mixing. Mixing tanks are commonly used on small volumes of trade waste streams produced by printing processes and photographic processing.

The function of a solvent and oil interceptor is to reduce the presence of solvents and oils in the trade waste stream. Solvents and oils float after the trade waste has had sufficient time to separate inside the interceptor. Remaining wastewater is what the interceptor discharges to sewer.

The function of a marble chip acid neutralising tank is to reduce the presence of an acidic trade waste stream by neutralising it.

The function of a straining pit is to reduce the presence of solid particles such as lint and hair in trade waste by straining and settling them out of the waste stream.