Water Treatment Plant (WTP) Multi Media Filter

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A Water Treatment Plant with Multimedia Filter (MMF) is a system used to remove particles or impurities in water by adsorption on the surface of a layered medium such as silica sand, gravel, activated carbon, manganese, zeolite, and others. Multimedia filters can filter and reduce the Silt Density Index (SDI) and Total Suspended Solids (TSS), or total suspended solids in water.

Suspended solids in water can include fine sand, mud, clay, phytoplankton, zooplankton, bacteria, fungi, or the remains of organisms.

In addition to producing clean water that meets the Clean Raw Water Standards and Minister of Health Regulation No. 2 of 2023 on Hygiene and Sanitation, a WTP with multimedia filters is also necessary for pre-treatment before water is used for further water treatment processes such as reverse osmosis, demineralization, and others. High suspended solids can reduce the system's effectiveness and performance.

The working principle of a Multimedia Filter begins with water entering from the top of the tank, flowing downward through a layer of filter media, trapping particles and contaminants. Clean water then exits from the bottom of the system. If the media becomes saturated or clogged with particles, backwashing is sufficient to clean the media and restore its performance.

Functions of a Multimedia Filter in a Wastewater Treatment Plant (WTP)

• Removing suspended particles (TSS)
• Removing turbidity
• Removing metals (iron, manganese, etc.)
• Removing color and odor
• Clarifying water
• Maintaining the stability of the secondary treatment system
• Etc

Inlet Water Sources

Some water sources that can be used as WTP inlets with multimedia filters include:

• Rivers
• Reservoirs/Ponds
• Wells
• WWTP/STP (Recycling) Outlets
• Etc

Filter Media Used

The selection of filter media in a filtration system is adjusted to the raw water content. Some commonly used media include:

• Gravel
• Silica Sand
• Anthracite
• Manganesse Greensands (medium iron content)
• Manganesse Zeolite/Ferolite (high iron content)
• Activated Carbon
• Etc

PT Zefa Valindo Jaya has over 25 years of experience as a WTP specialist in Indonesia. The WTP system package consists of:

• Multistage pump
• Sand & Carbon Filter
• Softener & Brine
• Cartridge Filter
• UV Sterilizer
• Electrical Panel

Routine WTP Multimedia Filter Maintenance

• Inlet and outlet pressure monitoring
• Backwashing (1–2 times per week)
• Filter media replacement (2–3 years)