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High Rate Filtration System “MARIMO”

The high-rate filtration system MARIMO is filtration equipment filled with fiber filter media. The high porosity of the filter bed allows increasing the filtration speed while reducing the system’s size.

Features

  1. Operation is performed with low pressure loss.

  2. The filtration speed can be increased to over 1,000 m/day.

  3. Installation area (footprint) can be reduced.

  4. The amount of suspended solids (SS) captured is 6 kg-SS/m3, which exceeds the amount captured by the rapid sand filtration.

  5. The amount of suspended solids (SS) remaining in the filtered water is less than 5 mg/l, which is almost the same as in the rapid sand filtration.

  6. The amount of backwashing drainage is less than 2% of the amount of filtered water per cycle.

Applications

・Turbidity removal (e.g., pretreatment for membrane filtration/ ultraviolet disinfection) at purification plant


・Total amount of filtration of secondary treated effluent


・Sewage reuse applications; (1) reuse in sewage treatment plants (water for toilet, water for miscellaneous use, and water for industrial use), (2)water for landscape use, (3) water for recreational use


Filter Media and Filter Layer Specification

Comparison of Filtration System “MARIMO” and conventional rapid sand filtration system

Experiences of Filtration System “MARIMO”

We have experiences of over 250 projects to supply MARIMO from 1981 throughout the world.


Made of Steel Plate


15,400 m3/day in Sewage Treatment Plant in Japan

200m3/day; Demonstration plant in France

4,000 m3/day in Sewage Treatment Plant in Japan

100,000 m3/day for Sewage Treatment Plant in China

RC Structure


153,000 m3/day in Sewage Treatment Plant in Japan
It consists of ten (10) filter cells made of concrete.

10,020 m3/day in Sewage Treatment Plant in Japan
It consists of three (3) filter cells made of concrete.

Example of Operation Method utilized in Filtration System “MARIMO”

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Hitachi Zosen Corporation, Environment Headquarter, Global Business Unit, Project Development Group
TEL:+81-3-6404-0843
FAX:+81-3-6404-0849


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