We have specialty skills and a unique track record in recovering resources from wastewater treatment

We offer a full suite of services for resource recovery and reuse, from market evaluation and planning through design and implementation of innovative waste processing and resource recovery solutions, 'to-digestion' for processing high strength liquid wastes, biogas utilization, heat recovery, phosphorous concentration for fertilizer production, and water for in-plant and offsite use.

Handling waste in urban areas is coming under scrutiny in many countries, and resource recovery is a key strategy to manage wastes effectively.

Opus has developed a range of skills in this area, and has implemented such diverse projects:

  • Reclaimed water for inplant and other offsite uses
  • Heat Recovery from wastewater to satisfy plant needs or power district energy systems
  • Energy recovery through digestion and biogas utilization for large scale heat and power

Managing liquid waste

Co-digestion is the feeding of high strength liquid wastes directly to anaerobic digesters to generate energy - biogas - and process otherwise difficult to treat waste streams. It has two benefits: energy is saved by diverting waste streams out of the liquid treatment process; and energy is produced by the rapid conversion of these wastes in existing anaerobic sludge digesters.

We can also help with planning and implenting waste solutions that use High Solids Anaerobic Digestion (HSAD) for treating solid organic wastes - particularly food waste. HSAD is a relatively new technology developed and commercialized in Europe, mainly seen in Germany.

Managing food waste

HSAD is ideal for processing food waste and combined food and yard waste in streams as very little pre-processing of the waste stream is required. Energy needed to operate the HSAD process is low and the digested organic material is high in nutrients and composts easily. 

Managing municipal wastewater

Municipal wastewater contains large amounts of heat that can be extracted using heat pumps and distributed to residential or commercial customers for use as a heating or cooling source depending on the season. District Energy Systems (DES) are used to distribute heat to customers. DES can be high temperature or low depending on the heat source and customers' heating and cooling needs.

HSAD is a very flexible process and can be adapted to mixed organic waste streams, energy crops or high strength and organic