Kuraray PVA Gel

Through over a decade of research and development, KURARAY company has established PVA Gel beads as an effective biological wastewater treatment technology. PVA (Polyvinly alcohol) Gel is a porous hydrogel that is ideally suited for immobilization of microorganisms essential for the degradation of environmental pollutants.

Kuraray PVA (Polyvinyl Alcohol) gel is a high-performance material used in water treatment processes. It is renowned for its exceptional durability, chemical resistance, and mechanical strength. PVA gel’s primary application is in membrane bioreactors (MBRs) and other filtration systems where it acts as a medium for biological treatment, promoting efficient removal of contaminants from wastewater. Its structure allows for a high surface area, facilitating effective microbial activity and filtration efficiency, making it ideal for both industrial and municipal wastewater treatment.

  • Translucent or Opaque: PVA gel typically appears as either translucent or opaque.
  • Color: It ranges from clear to milky white, depending on its formulation.
  • Consistency: The gel has a jelly-like consistency.
  • Form: Often supplied in small beads or granules.
  • Hydration: Beads or granules swell when hydrated.
  • Structure: Creates a uniform, porous structure when hydrated.
  • Texture: Smooth and gelatinous, ensuring efficient handling and integration into water treatment systems.

Characteristics of PVA Gel

PVA-Gel is an advanced wastewater treatment Bio-Carrier suitable for municipal wastewater treatment and especially suited to high BOD Load wastewaters such as Leachate, Dairy, Meat Slaughtering and Processing, Pharmaceutical, Petrochemical, etc.

PVA-Gel Bio-Carrier is a 4mm Diameter Polyvinyl Alcohol Hydrogel bead, with a unique ability to house only the required micro-organisms within it’s very porous structure (approx. 20 microns) which are responsible for the degradation of contaminants, both in Nitrification and Denitrification applications.

PVA-Gel has estimated 6000m²/m³ surface area and consumers on average 25kg BOD/m³ PVA-Gel/Day which makes it possible to treat 2-5 times the BOD Load in your existing facility, requiring only minor adjustments and modifications to the plant and process.

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Microbial Capacity

One PVA gel bead can hold up to 1 billion microorganisms, enhancing biological treatment processes.

Water Content

High water content due to extensive porosity, allowing favorable permeability of oxygen and nutrients.

Durability & Efficiency

Polymerized PVA gel is insoluble in water and not biodegradable & Can enhance treatment ability up to 5 times compared to conventional activated sludge.

8Lakh Ltr+

PVA Gel Installations

Treatment Of BOD Removal

An existing wastewater treatment plant is considered that has 250 m3 activated sludge tank and a 45m3 clarifier. The plant is originally designed to handle 150 m3/d with an influent BODs of 1000 mg/L. However the plant is now in need of an upgrade to handle an increased flow of 300 m3/d (with the same BOD) for which three design options are shown in slide. A conventional activated sludge system would require about twice the existing tank volumes to treat the increased loading.

PVA Gel and flocculation process in wastewater treatment. Wastewater enters a GEL tank containing PVA Gel with a packing ratio of 4.8% (Volume 12m³) and a BOD load of 25kg/m³-gel·d. After treatment, the water moves to a settling tank where coagulation and sedimentation occur, facilitated by PAC, NaOH, and polymer additives. The treated water is then discharged, with excess sludge managed without the need for sludge return, achieving a BOD conversion ratio of approximately 30% plus coagulants.
Wastewater first enters a GEL tank with a packing ratio of 10% (Volume 12m³) and a BOD load of 25kg/m³-gel·d. It then flows into an activated sludge tank, where the BOD sludge loading is 0.15-0.2kg/kg·d, and the MLSS is about 3000mg/L. Treated water passes through settling tanks for further purification. This system effectively reduces excess sludge with a BOD conversion ratio of approximately 15%.
Wastewater enters a GEL tank with a packing ratio of 10% (Volume 12m³) and a BOD load of 25kg/m³-gel·d. It then flows into an activated sludge tank with a BOD sludge loading of 0.15-0.2kg/kg·d and an MLSS of about 3000mg/L. Treated water moves through settling tanks for further purification. This system effectively minimizes excess sludge with a BOD conversion ratio of approximately 15%.

Treatment for Nitrogen Removal

For an influent wastewater flow of 300 m³/day with a total nitrogen (T-N) concentration of 60 mg/L, the nitrogen removal process involves two main reactions:

  1. Nitrification Reaction (Aerobic):
    • Ammonia nitrogen is converted to nitrite and then to nitrate.
    • This process requires sufficient dissolved oxygen and minimal interference from organic carbon.
  2. Denitrification Reaction (Anoxic):
    • Nitrate is converted to nitrite and then to nitrogen gas.
    • This process requires sufficient organic carbon and minimal interference from dissolved oxygen.

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