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Hitachi

Hitachi Infrastructure Systems (Asia) Pte. Ltd.

Overview

The Hitachi fluidized bed biological treatment system is a treatment system that combines a fluidized bed that lets special carriers flow in the treatment tank with a contact oxidation tank for finishing. The system's highly activated biological membrane forms on the surface of the carriers and provides stable treated water. This method is effective for fast-multiplying microorganisms like bacteria that break down BOD.

Features

  1. Highly concentrated biological treatment is possible
    • BOD concentration in raw water: 30-5,000 mg/L
    • BOD volume load: 1-2 kg-BOD/m³ /day
  2. Conserves space
    • Our system can maintain high sludge concentration inside the biological treatment tank, which reduces the space needed for traditional facilities by about half.
  3. Maintenance is easy
    • The amount of sludge generated can be reduced.
  4. Can be applied as a modification
    • This system can be applied as a modification to existing biological treatment equipment.
Comparison of activated sludge methods
  Activated sludge method
(Suspended type)
Fluidized bed
Biological treatment system
BOD load 0.5 kg/m³/day 1.0-2.0 kg/m³/day
Amount of air for aeration 100% 75%
Equipment cost 100% 95%
Operating cost 100% 80%

(in-house comparison)

System

Image: Treatment flow diagram

Photograph: Fluidized bed biological treatment system and carriers where microorganisms adhere
Fluidized bed biological treatment system and carriers where microorganisms adhere

Applications

  • Industrial wastewater treatment