Alternating Direction Oxidation Ditches—A Cost Saving Technology from Denmark

by Ricky L. Dedman, Boals, Brown & Dedman Inc, United States,

Document Type: Proceeding Paper

Part of: Critical Water Issues and Computer Applications


A soon to be released EPA report claims that in Denmark, small alternating direction oxidation ditches (ADOD) save as much as 70% of the cost for conventional oxidation ditches. The alternating direction ditch is one of three proprietary and innovative variations of the oxidation ditch developed by I. Kruger A/S of Denmark. The United States Environmental Protection Agency calls the Kruger ditches phased isolation ditches (PID). PIDs incorporate the low-cost features of batch reactors and the simple, reliable nature of the oxidation ditch variation of the activated sludge process. The author was responsible for the facilities planning and technology assessment for Blaine, Tennessee's, proposed PID Public Owned Treatment Works (POTW). The ADOD variation appears to be particularly well suited for small community POTWs and especially so when they must meet advanced secondary standards for biochemical oxygen demand (BOD) and ammonia. Using estimates based on American construction practice, Blaine's ADOD assessment projects life cycle cost savings of 19%, 17% and 17% and energy savings of 42%, 35% and 35% when compared to a conventional oxidation ditch, sequencing batch reactor and intermittently cycled extended aeration system, respectively.

Subject Headings: Oxidation | Benefit cost ratios | Construction costs | Chemical treatment | Federal government | Activated sludge | Chemistry | Oxygen demand | Denmark | Europe | United States

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