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PROJECT DESCRIPTION

Bound to clean train or public toilet

This model shows physical methods intreating the wash water collected from automobile service stations. Wash waterwas characterized for different parameters such as pH, turbidity, conductivity,total solids, oil and grease, COD (chemical oxygen demand), BOD (biologicaloxygen demand), chlorides, sulphate and total hardness. For chemical treatment,alum was used and locally available natural materials such as saw dust andsugarcane bagasse were used for physical treatment. Alum at different concentrationswas agitated with the effluent for a prescribed contact period which led to theformation of flocs. The filtered samples were tested for COD and oil &grease.

Filteringprocess

1.     Screening

2.   Oilskimming

3.    Coagulationand flocculation

4.   Cartridgefilter

5.    Storage

Primary filtering process (Screening) -

At themouth of the intake pipe there are a series of screens whose purpose is toprevent suspended particles from entering the system and finding their way intothe pumps. This is the first stage of treatment. The water then enters a tankcalled a sump from where it is pumped to the next stage of treatment known asclarification.

Oil skimming

An oil skimmer isa machine that separates a liquid from particles floatingon it or from another liquid. A common application isremoving oil floating on water. These technologies are commonlyused for oil spill remediation but are also commonly found inindustrial applications such as removing oil from machine tool coolant andremoving oil from aqueous parts washers.

Coagulation and Flocculation -Theclarification process which mainly removes second category of particlesinvolves two main processes – Coagulation and Flocculation. A chemical known asa coagulant such as Aluminium Sulphate (or Alum) is mixed in the water. TheAlum distorts the properties of the suspended particles that prevent them fromsettling and causes them to come together (coagulate) to form larger particlescalled flocs through the flocculation process. As the flocs become bigger andheavier they begin to settle to the bottom of the clarifier from where they areremoved. Water leaving the clarification stage is clear but not yet safe fordrinking because the addition of alum leaves it slightly acidic and still containsmicro – organisms.

Cartridge filtering process

The ‘dirty’ water is pouredinto the top of a tank which contains layers of sand, charcoal and gravel. Asthe water sinks through the various layers the bacteria and dirt are removed.The clean water flows through a hose/pipe into a ‘clean’ water storage tank.The water is now ready to use again in service station

Apparatus required

1.     DCgear motor – 2

2.   Disc-1

3.   Plastic container-5

4.   DC pump – 1 and pipes

5.    Propeller



Block diagram Images

Project Images



Video Link:-
 
Project Cost:- Rs.3000
Courier Cost:-Rs. 200.00
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  Total Cost :- Rs. 3200
(inclusive all the taxes)
 

 

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