Active Return Sludge Process EnviDan supplies innovative solutions to the challenges regarding overload and bypass of existing plants. We can successfully implement the ARP-process at any WWTP to increase the organic or hydraulic capacity with up to 60% and thereby avoid or limit an expansion. When using ARP, a part of the biological process is moved from the original activated sludge plant to a volume, including only the return sludge, with varying nitrification and denitrification and with a concentration of sludge that is significantly higher than in the activated sludge plant. Depending on the needs and the plant configuration the ARP process can be used for increasing the hydraulic and/or organic capacity of the existing WWTP. This way we can improve the volume utilization considerably. The ARP-process can also be used to a faster treatment of highly concentrated nitrogen sources, as for example reject water from sludge digestion, where the high sludge concentration in the ARP tank is used for a more effective nitrogen removal. Use EnviDan to implement the ARP-process because: We have solid experience with ARPWe have references supporting our expertiseWe are visionary and innovative thinkingWe have a client centric approachWe will together with you find the right solution for your plantWe are a trustworthy company with a solid financial foundationWe have developed the process ARP is the right choice, because: ARP can be used for sludge minimarizationARP does not require the construction of new volumesARP ensures faster removal of highly concentrated nitrogen sourcesARP significantly improves volume utilization.The ARP solution is profitable over short timeARP can be used for biological P-removal

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