WWTP Ottestad, Hias IKS

Vacuum degassing of digested sludge with ELOVAC®-P


  • Avoiding greenhouse gas emissions
  • Prevention of uncontrolled struvite deposits

Scope of delivery and services

  • Supply of an ELOVAC®-P vacuum degassing system with option for integrated phosphate precipitation
  • Support with mechanical, electrical and information technology integration into the existing system
  • Commissioning support was provided remotely due to travel restrictions related to the Covid-19 pandemic

Technical Data

  • Size of the Hias IKS wwtp in Ottestad: 125,000 PE
  • Capacity of the ELOVAC®-P: 290 m³/d digested sludge
  • The ELOVAC® is operated with or without integrated phosphate precipitation as required (ELOVAC®-P)

Special features

  • The wastewater treatment plant is equipped with thermal disintegration (Cambi) - ELOVAC® thus treats disintegrated sludge
  • The wastewater treatment plant is being converted to the "Hias process", a highly compact process for biological nutrient elimination. In this context, good control of internal phosphorus flows is essential.

Hias IKS

December 2020