News & developments

On a food-waste AD plant in eastern Switzerland, a 4-stage thermal vacuum evaporator closes the loop from restaurant leftovers to the field. It takes around 40 m³ of water a day out of the liquid digestate, recovers the nitrogen as ammonium sulphate solution (ASL) for a liquid fertiliser, keeps the nutrient concentrate usable for organic farming and returns all distillate as process water to the plant's own de-packaging line. Reduce. Recover. Reuse. On one site, in operation

Short answer: On our reference plant, a food-waste AD plant in Switzerland, our 4-stage thermal vacuum evaporator (DV series) turns around 350 kW of CHP waste heat into around 40 m³ of distillate per day, or 4.5 to 4.7 litres per kWh. Over 51 complete operating days it was evaporating 82 % of the time, runs unattended at night and at weekends and needs about 1.5 hours of staff time per day. The heat transfer stayed stable from August to October, with a planned acid and alkali