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March 2013 Solids Minimization updated 2012 Cyclic Metabolic Environment Objective: Biological treatment with decreased waste biosolids volume. Description: Emerging Technologies Technology Summary State of Development: Innovative. The Cannibal® process seeks to reduce solids production from biological wastewater treatment by adding an unaerated interchange tank to the process and cycling the biomass between the metabolic environments established in the interchange tank and the main bioreactor. A portion of sludge from the main treatment process is pumped to a sidestream interchange bioreactor where the mixed liquor is converted from an aerobic environment to a facultative environment. Some bacteria decay in the interchange reactor, while other bacteria break down and use the remains of the decaying organisms, their by-products, and anaerobically digestable organics. The bioreactor is periodically aerated to maintain dissolved oxygen at the transition between anoxic and anaerobic conditions. Mixed liquor from the bioreactor is recycled back to the main treatment process. There, other bacteria decay and are subsequently broken down. The process continues use of the alternating environments of the aerobic treatment process and the interchange bioreactor. An important step is the removal of inorganic materials by a solid-separation module (fine drum screen/hydrocyclone) on the return sludge line. All the return sludge is pumped through this module and recycled back to the main treatment process. Only a portion of this flow is diverted to the sidestream bioreactor for the selection and destruction process. The decreased wasting limits biological phosphorous removal in this process, but physiochemical removal via chemical addition has been successful when sludge wasting is adjusted to compensate. The interchange tank is typically open and thus can create odor issues if aeration rate and ORP are not carefully controlled. Reductions of 60 to 70 percent or more in sludge production have been reported. However other installations have not been able to achieve similar performance. Initial research to determine the cause of the performance differences has focused on the release of soluble chemical oxygen demand in the interchange tank, but the mechanism is still not well understood. Comparison to Established Technologies: Not similar to any established technology. Available Cost Information: Approximate Capital Cost: Not disclosed by vendor. Approximate O&M Costs: Not disclosed by vendor. According to the vendor, a 1.5-MGD WWTP could recognize an approximate net annual operating cost savings of $245,600 using the Cannibal process. Vendor Name(s): Siemens Industry, Inc. - Cannibal Water Technologies Telephone: 866-926-8420 or 724-772-1402 Web: www.water.siemens.com Installation(s): Cannibal Approximately 60 installations have been completed since the inception of the process in 1998. Several installations have shut down for various reasons including odors. Current installations are being monitored by the manufacturer to meet performance guarantees. Example municipal installations: Columbia, SC Cumming, GA Peru, IN Byron, IL Lebanon, OR Clovis, CA Wastewater Treatment and In-Plant Wet Weather Management 3-23PDF Image | Emerging Tech for Wastewater Treatment
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