Metawater's 'Mechanical Winding Stainless Lining Digester Tank' Selected as JS New Technology

Metawater Co., Ltd. (President: Kenji Yamaguchi, Head Office: Chiyoda-ku, Tokyo) has had its 'Mechanical Winding Stainless Lining Digester Tank' selected as a Class I New Technology by the Japan Sewage Works Agency (JS) (Chairman: Norihiro Kuroda, Head Office: Bunkyo-ku, Tokyo), based on joint research outcomes.

The Class I New Technology designation is granted following review of applications from joint researchers, assessing suitability for implementation in JS-contracted construction projects. This technology enhances the constructability and maintainability of digester tanks by utilizing high-corrosion-resistant stainless lining panels and the mechanical winding method, achieving significant cost reductions. It will now be actively introduced in JS-contracted construction projects.

<Overview>

Designated Technology Name

Mechanical Winding Stainless Lining Digester Tank

Key Features of the Technology

[1] Lifecycle Cost (LCC) Reduction The use of high-corrosion-resistant stainless lining panels eliminates the need for anti-corrosion painting, reducing maintenance costs. Additionally, the digester tank structure is assembled by winding panels upward using dedicated machinery positioned on the ground, minimizing the need for scaffolding and labor, thereby reducing construction costs.

[2] Improved Operational Stability Equipped with various sensors such as foam detectors and sedimentation countermeasures, the system prevents digestion-related issues before they occur.

Schematic Diagram of the Technology

Mechanical Winding Stainless Lining Digester Tank (before insulation installation)

Implementation Benefits

Compared to conventional steel digester tanks, lifecycle costs (LCC) of digestion facilities can be reduced by approximately 20–30%.

Application Conditions

Scale

Up to 7,000 m³ per unit

Target Sludge

Sewage sludge (primary and surplus)

Sludge Input Concentration

TS 6% or lower

Digestion Conditions

Mesophilic digestion

Others

Insulation thickness must be adjusted based on temperature conditions; coastal areas require salt damage countermeasures

Related Information

JS New Technology Introduction Program JS Press Release Materials