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Pressure Sand Filters And Multimedia Filtration Plants

KORGEN is one of the leading suppliers of a wide range of Pressure Sand Filters and Multimedia Water Filtration Plants in Chennai, Tamil Nadu and select cities across South India.

While we have a wide range of pre-engineered and standard Sand Filters and Multimedia Filters, we also design, manufacture and supply high-volume Filtration Plants custom-built for specific requirements.

Our technical experts analyse the water characteristics such as the level of suspended solids and turbidity in the feed water, other related parameters, evaluates the site conditions and specific customer requirements before deciding on the specifications of the filtration plant. Even our standard modules of Water Filters are selected / recommended based on key parameters of the feed water. The performance consistency and durability of a filtration plant depend on key engineering factors such as Unit Volume, Material of Construction, Filter Media Composition besides complying with the prescribed usage and maintenance procedures.

Starting from water analysis to the selection of the right filtration plant that meets your requirements, KORGEN will closely guide you, at every stage, to take informed buying decisions.

After erecting and commissioning the filtration plants, we also offer various types of after-sales service packages at very competitive rates to make sure that the Water Filtration Plants deliver optimal performance and our customers get the maximum value out of their investment.

KORGEN Pressure Sand Filters and Multimedia Filtration Plants are manufactured / sourced under stringent quality control norms and tested to international quality standards in every aspect.

Special Treatment for High Turbid Water

In addition to Filtration Plants, KORGEN also designs and installs special mechanical devices such as clarifiers that are used as pre-treatment units for treating water with very high levels of turbidity, suspended solids and colloidal particles. Eg. Surface water sources like rivers, streams and sea. These clarifiers help in the settlement of colloidal particles by providing a larger surface area. Accessories like flash mixers, flocculators and chemical feeding systems are offered as part of the system.

Types of Clarifiers

Primary Clarifiers	Lamella Plate Vertical Clarifiers
Secondary Clarifiers	Horizontal Plate Clarifiers
Solids Contact Clarifiers

Types of KORGEN Pressure Sand Filters and Filtration Plants

Standard Pressure Sand Filters and Multimedia Filters for homes and individual houses
Custom-built high-volume Multimedia Water Filtration Plants for apartments and commercial establishments
Industrial Pressure Sand Filtration Plants and Multimedia Filters

Our range of Sand Filtration Plants starts from a compact 750 LPH (Litres Per Hour) model and goes up to 1000m3 LPD (Litres per day) plant.

Based on customer requirements, we supply manual, semi-automatic and fully automatic pressure sand filters and multimedia filtration plants made up of Fibre Reinforced Polymer (FRP) / Composite Vessels, Mild Steel with corrosion-proof Rubber Lining inside and epoxy-coating outside (MSRLEC) and high-grade Stainless Steel (SS).

Advanced and proven internal strainers used in KORGEN Water Filtration and Treatment Plants ensure even distribution of the feed water into the media bed and proper collection of treated water thereafter.

Automation of these Water Filtration Systems is achieved using semi and fully automatic multiport valves along with control panels that house process logic controllers. Multiport valves make the water filtration process highly user-friendly due to its single-point operations, controls and seal capability of the valves prevents internal port leaks. In case of higher flowrates, manual valves are used with complete support piping for smooth operations.

Variants of Water Filtration Plants

KORGEN manufactures and supplies a wide range of vertical and horizontal water filtration plants (Stand-alone and in series) based on specific applications and site conditions such as

Pressure Sand Filter (PSF)
Rapid Water Filtration Units (RWFU)
Multimedia (Depth) Filtration Plants (MFP)
Dual Media Filters (DMF)
Side Stream Filters (SSF)
Valve-less Gravity Sand Filters (GSF)

Advantages of KORGEN Pressure Sand Filters and Multimedia Filtration Plants

Designed based on established formula and time-tested norms that maximize filtration area

Unique multimedia combination ensures efficient filtration of physical impurities

Customized Units based on the water characteristics and site conditions

Effectively removes suspended solids, turbidity and other physical impurities

Minimal pressure-drop across the filter bed

Delivers consistent performance at optimal efficiency over the long term

High quality internals and components ensure long life and durability

Lesser power consumption and user-friendly maintenance processes

Comes with 1 year all-inclusive warranty and special extended 5-years vessel warranty*

Additional accessories to facilitate easier operations and monitor various performance parameters. Eg. Digital Flow Meters, Totalizers, Pressure Gauges, Control Panels, Portable Test Kits etc.

Wide range of models (Manual, Semi-automatic, Fully Automatic) that are competitively priced

Prompt and efficient after-sales service network
* For select standard products. Conditions apply.

Know more about Sand Filters and Multimedia Filtration

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Technology and Process Description

Pressure Sand Filters and Multimedia Filters are only slightly different from each other with different media composition used for various types of water filtration purposes. While pressure sand filters are used only to filter excessive physical impurities (Turbidity, Suspended Solids etc) from water, multimedia filters - using depth filtration technology (DFT) - combine the functional advantages of pressure sand filters and activated carbon filters thereby removing odour, colour, residual chlorine and VOCs in addition to physical contaminants

Media Composition

Pressure Sand Filters	Multimedia Filters
Graded Quartz Sand	Graded Quartz Sand
Sieved Fine White Sand	Sieved Fine White Sand
Pebbles \| Silex	Activated Carbon Granules of high IV
	Pebbles \| Silex

When water is pumped through the Pressure Sand Filter or Multimedia Filtration plants, the multi-layered media effectively filters excessive turbidity, suspended solids, bad odour, colour, residual chlorine and to a certain extent VOCs (Volatile Organic Compounds) present in the water. Besides, the media composition also enhances the dirt holding capacity of the water filtration plants with minimal pressure drop across the media bed at higher velocities.

In the event of very high level of suspended solids or in high volume filtration plants, measured dosing of coagulants and flocculants are used to enhance the efficiency of the filtration plant.

Correct composition and alignment of the media helps in ensuring even distribution of the filtration load (phased removal of physical contaminants throughout the filter bed) thus allowing much longer ‘Filter Run Times’. It also facilitates easy maintenance of the Filtration Plant resulting in longer life of the media.

Illustration – Low Volume Filter

Illustration - High Volume Filtration Plants

Maintenance of Filtration Plants

Backwash: The accumulated physical and other impurities need to be removed from the media on a periodical basis to ensure that the Filters always deliver optimal performance. The impurities trapped in the media are removed by backwash process in which the direction of the water flow is reversed. In this backwash process, the reversed water flow agitates and loosens the media bed and all the impurities are flushed out through the backwash outlet-valve.

Since the water that is used for backwashing will be having high concentration of physical impurities, the same can be again treated and reused to avoid environmental issues.

Rinse: Once the backwash operation is completed, rinsing should be done to reset the media and make it ready for the next filtration cycle.

These maintenance operations need to be performed at prescribed intervals for optimal performance and longer life of the filtration plants.

Air Scouring is required in high volume water filtration plants to aid and complete the backwashing and rinsing processes.

Illustration – Low Volume Filter

Illustration - High Volume Filtration Plants

Product Features and Technical Information

Product Features and Technical Information of Filtration Plants

Unless warranted under special conditions, Pressure Sand Filters and Multimedia Filtration Plants generally comprise the following major parts

iVessel
iiValve
iiiMedia

The basic design and dimensions of the Pressure Sand Filters and Multimedia Filtrations Plants are highly formula-driven and should be primarily based on the following factors.

Suspended Solids and Turbidity in the Feed Water
Other related feed water characteristics
Hourly Flow Rate (LPH) required
Volume of water to be filtered per day
Site Conditions and end use applications

General Applications

General Applications of Pressure Sand Filters and Multimedia Filtration Plants

Used to reduce turbidity and suspended solids in municipal and corporation supplied water
Used for high-turbid open well and bore well waters
Used as pre-treatment units for Softeners, DM Units and RO Plants
Used in the recycling plants for process water in industries
Used for filtration of cooling tower water
Used for recirculation of swimming pool water
Used as tertiary filtration units for Sewage Treatment and Effluent Treatment Plants

Caution:

Output water from these filtration plants can be used for consumption only if the TDS, Hardness and other related parameters are within the prescribed limits. Or else, further treatment may be warranted to make this water potable.

Clarifiers for High Turbid Water

Clarifiers For High Turbid Water

Clarifiers are required when water contains excessive turbidity, suspended solids and colloidal particles. In the treatment scheme, it acts as a pre-treatment to the Filtration Plants and is also a crucial part of Sewage Treatment Plants. Generally, surface water sources such as rivers, streams and seas will have higher concentration of such physical impurities.

Most of the clarifier tanks are of circular or rectangular design. Various types of clarifiers in a variety of sizes are available, as detailed here below, based on specific requirements and site conditions.

Clarifiers operate based on the principle of gravity-driven settling. Clarifiers are designed to reduce the velocity of the influent water and distribute it uniformly in a radial manner in all directions. This provides maximum settling time resulting in the efficient separation of settled particles from water.

The heavier solids and particles settle in the clarifier due to the quiescent conditions provided in the clarification zone. The settled solids are then swept to the centre well provided for collection of sludge with the help of moving scraper blades. The clear water overflows via a launder provided at the top portion.

Generally, the settling process is expedited by the addition of measured dosing of coagulants and flocculation agents. These coagulants neutralize the charges and agglomerates the suspended solids leading to formation of micro-flocs. The polyelectrolytes bring these micro-flocs together and the larger floc settles down easily.

High Rate Solids Contact Clarifiers ensure a higher clarity in water quality and greater tolerance to variations in inlet conditions. Since there are no major moving parts, it is highly maintenance-friendly and is designed to work totally on gravity.

Lamella Clarifier

Lamella clarifier technology is a versatile clarification-cum-separation arrangement in which solids, oil and grease can be removed from the feed water. The design of lamella utilize a series of parallel plates that maintain a laminar, stable flow in between the plates. The plates are provided with a mirror finish to attract and settle the flocculated particles. The particles accumulate on the surface and slide down due to gravity. The sludge accumulates at the bottom cone. Lamella clarifiers are compact and ideal for high suspended solids and chemical-based sludge and occupies only 1/5th of the space required by conventional clarifiers.