1967 Commencement of operations
1978 Chemical purification stage, phosphate precipitation. Inlet vave in the arabern tunnel
1985 Waste Water Filtration
1988 Sludge decontamination, sludge dewatering
1996 Establishment of the corporation ara region bern ag
1997 Exhaust treatment, Initial drainage of fresh sludge, portable sludge drying plant
1999 Commissioning of the separate anaerobic digester supernatant treatment (SBR)
2002 Commissioning of the stationary sewage sludge drying plant
2005 Commissioning of the modernized biological treatment (Biostyr)
2006 Inauguration of the Stage III expansion
2007 Reception facility for biomass
2008 Commissioning of a biogas refinement plant I
2009 Commissioning of the completely renovated gas infrastructure
2010 Commissioning of pumping station and stormwater tanks in Belp, Belp-Kehrsatz pressure main and rainwater tanks in Kehrsatz
2011 Completion of roads and landscaping of Nature Park
2012 Inauguration of new Administration building
2013 Commissioning of a Biogas refinement plant 2
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