Pressure filter is type of rapid sand filter in a closed water tight cylinder through which the water passes through the sand bed under pressure.
- All the operations of the filter is similar to rapid gravity filter, expect that the coagulated water is directly applied to the filter without mixing and flocculation.
- These filters are used for industrial plants and these are not economical on large scale.
- Pressure filters may be horizontally or vertically oriented
- Backwash is carried by reversing the flow with values.
- The rate of flow is 120 to 300m3/m2/day.
Advantages
- They are compact and automatic in operation
- It is ideal for small water works and small estates
- They require small area for installation
- They have small number of fittings
- The filtered water comes out with pressure and no further pumping arrangement is needed
- No sedimentation and coagulation tanks are required with these units
Disadvantages
- Because of heavy cost, they cannot be used for treatment of large quantity of water at public water works
- Quality control and inspection is not possible because of closed tank
- Efficiency of removal of bacteria and turbidity is low
- Change of filter media, gravel and repair of drainage system is difficult
Sewage Treatment Plant in Delhi controls the spread of diseases. Residual wastes from hospitals, research facilities as well as other industries can be difficult for our health and the environment. These harmful elements might need thermal treatment for controlling the spread of diseases or toxins. Sewage sludge incineration reduces the volume of up to 90% and weight up to 75% and breaks down dangerous substances like toxic and pathogen chemicals. Flue gases from exhaust pipes must be handled by using a complex treatment system to prevent hazardous emissions and ashes from contaminating the environment.
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