Japan Platform for Redesign: Sustainable Infrastructure (JPRSI)

JPRSI Member Associations

Maximize Sewage Sludge Utilization -Drying sewage sludge with preheated raw meal-

Waste Treatment & Recycling Waste Treatment / Management Sludge Treatment and Recycling

Technology / Service Summary

Taiheiyo Sewage Sludge Reactor System could minimize the impacts of the water content of Sewage Sludge (Heat loss, Production loss and Unstable operation) with maximum Sewage Sludge utilization.

Purpose

Sewage sludge contains a large amount of water but, after drying, a considerable amount of combustible material and ash remains.
The cement industry can dispose of this harmlessly and safely using high temperature waste heat and simultaneously utilize not only the combustible material as fuel, but also the ash as raw material.
For the efficient utilization of sewage sludge, Taiheiyo Engineering Corporation and Taiheiyo Cement Corporation have developed a breakthrough drying technology using the preheated raw meal.

Feature

1. Low investment cost / Less installation space
・Compact system can be made thanks to the high performance heat transfer.
T・his system can be installed with low investment cost, less space and short time, so it enables quick cost recovery.

2. Stable kiln operation / Least impact to clinker production
・From this system, dried powder is fed to the kiln.No adhesion or volume increase from moisture happens. This helps maintain the stable kiln operation. Comparing with direct (wet) sludge utilization system, clinker production reduction is almost eliminated.

3. Less energy consumption
・Since no moisture is fed to calciner (de-carbonation part), additional fuel consumption can be avoided. Also, heat value from sludge can be fully utilized.

4. Denitrification (De NOx) effect (Conversion to low cost fuel)
・The exhaust from sludge drying is brought to the outlet of bottom cyclone. Ammonia contained in sludge is utilized there as de-nitration agent. Further denitrification can be achieved by adding urea to the Reactor.

5. Safety
・The Reactor is designed not to introduce air (oxygen). Without concern for explosion, safe operation is secured.

Effect

Taiheiyo Sewage Sludge Reactor System can treat 200t/d Sewage Sludge with effective & efficient water content separation (Water content < 5%).
As the result, Taiheiyo Sewage Sludge Reactor System could minimize the impacts of the water content of Sewage Sludge (Heat loss, Production loss and Unstable operation) with maximum Sewage Sludge utilization.

Reference

Applicable Regions / Countries

  • Japan
  • Southeast Asia
  • Central/South Asia
  • China/ East Asia
  • Middle East
  • Europe
  • Central/South America
  • ASEAN countries

    Indonesia,Cambodia,Singapore,Thailand,Philippines,Brunei Darussalam,Viet Nam,Malaysia,Myanmar,Lao PDR

Accomplishments

・Japan
・China

Locations for inspection

China

Related SDGs Goals

  • 6. Clean Water and Sanitation
  • 7. Affordable and Clean Energy
  • 9. Industry, Innovation and Infrastructure
  • 13. Climate Action
  • 14. Life Below Water
  • 15. Life on Land

Maximize Sewage Sludge Utilization -Drying sewage sludge with preheated raw meal-