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February 21, 2018 Two New Technologies Registered on JS Innovation Program New dehydrator and high concentration digestion technology reduce LCC of sludge treatment

Japan Sewage Works Agency (JS) has been running JS Innovation Program* since 2011. The program aims to encourage the development of new technologies that meet various needs of municipal wastewater business and facilitate the adoptions of the innovative technologies to our entrusted projects.
JS adds the following two technologies on the Program.

Screw Press Dehydrator with Multiple Disks
  • Developer:
    JS, Amcon Inc.
  • Technology Summary:
    A screw press dehydrator with multiple disks is widely adopted at WWTPs with Oxidation Ditch (OD) process. The newly developed dehydrator added new functions including thickening and automatic control has two models adapting to OD process and Conventional Activated Sludge (CAS) process. The OD process-adaptive model can be expected to reduce LCC by the improvement of treatment performance compared to the conventional dehydrators. CAS process-adaptive model can achieve space-saving and LCC reduction compared to other kinds of dehydrators.
2e model flow chart

High Concentration-adaptive Filtering/Thickening Mesophilic Digestion System
  • Developer:
    JS, Tsukishima Kikai Co., Ltd
  • Technology Summary:
    In the new system, high concentration-adaptive filtration thickener thickens primary sludge instead of the existing gravity thickening. Then, anaerobic digestion is carried out inside a high concentration-adaptive steel digester for thickened primary and excess sludge that are mixed inside a pump. The technology aims to increase the SS recovery rates in a thickening process, reduce the digester volume, calorific value for warming, and electric power consumption that contribute to LCC reduction.

flow diagram specification sludge reduction by high concentration tehcnology

* Note that JS Innovation Program verifies registered technologies for their applicability only at JSf entrusted projects.