vineri, 7 octombrie 2011

Mechanical treatment step circuit wastewater

1.Overflow room
Provided in the sewerage system unit, mechanical cleaning step before and after mechanical treatment step. This room provides admission to a treatment plant flow equal to N times the maximum hourly flow during dry weather wastewater. Flow spilled through the room emissary discharges only mechanically cleaned.

2. Grill
WWTP input is frequent or rare grilled with interspaces. Grids are aplaseaza entry wastewater treatment plant in the sand before Cleaners and wastewater pumping stations. Grills are designed to hold large floating bodies. Barbecues are mounted inclined at an angle of 60 ° to the horizontal. At the top of the gratings are set at least 1.5m wide platform equipped with rail that is cleaning. The platform is placed at least 0.5m above the maximum level of water.

3. Desanding
Cleaners location of sand is usually fat separator before, the primary strainer or waste water pumping station. Desanding role is to retain the mineral solids, ie sand from wastewater diameter greater than 0.2 ÷ 0.25mm.
Desanding drains are provided in a unitary system, the stations with higher flow rates 10dm3 / s or separation system for greater flow of 35 dm3 / s. Evacuation of sand deposited in horizontal longitudinal desanding is a mobile cleaner is equipped with a pneumatic air evacure. Mechanical installation is needed for protection against abrasive action of sand, reducing the likelihood of clogged pipes caused by the deposit of sand and reduce the frequency of cleaning sludge fermentation tanks.

4. Fat separator
Place the strainer after deznisipator before primary. Is designed to retain oil, waste oil and grease from wastewater. Fat separators are required to provide technological scheme, regardless of concentration, if treatment is followed by a biological mechanics. Fat separator provided with at least two compartments. The fat separator flotation takes place which consists of wastewater to remove oils and grease from water. Flotation is used to water from the oil industry, mining, food, pharmaceutical when industrial wastewater must be treated biological wastewater of the city.

5. Primary settling
Primary settling is to retinr of wastewater suspended solids that were not separable gravitational deznisipator retained. Disposal of sludge from primary settling can be continuously or intermittently.. If treatment is biological, settling time provided at least 1.5 hours. The primary settling occurs in the sedimentation of suspended particles. While the particles will settle to the bottom tank strainer.

6. Longitudinal horizontal decanters
Entry and distribution of water in settling compartment is via a pipeline to 40cm wall mounted compartment, referred to the inferior with more nozzles. For repattizarea uniform flow across the entire width of the compartment wall provided input semiinecat., To 60cm across compartment wall. Decanted water drainage is by overflow compartment we drowned the whole breadth
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7. Retention Basin
Place the overflow channel after storage room deversoare.are role of the mixture of sewage with storm water, sewerage system in the unit. Are provided for storing the amount of wastewater over a period of time, it is not possible leakage free download at the appropriate level envoy maximum flow.

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