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A SIDE-BY-SIDE COMPARISON OF STEP FEED BNR AND SIMULTANEOUS NDN

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Orange County Utilities (Florida) owns and operates the 163,000-m3/d (43 mgd) South Water Reclamation Facility (SWRF). This paper describes the performance studies conducted on two of the trains for the purpose of assessing differences in capacity and effluent quality between two different liquid treatment processes for nitrification and partial denitrification. The SWRF has three liquid treatment trains (referred to as plants for the purpose of this paper). Two of the liquid trains have single, large aeration tanks that were constructed as nearly identical oxidation ditches. One plant (the South East Plant) is still an oxidation ditch with mechanical surface aerators that is operated to obtain simultaneous nitrification and denitrification. The oxidation ditch in the second train (the South West Plant) has been modified to operate using a step-feed biological nutrient removal (BNR) process with diffused aeration. Full-scale testing was conducted over a range of operating solids retention times (SRTs) to compare the full-scale performance of both trains. During the performance study the two trains were operated at SRTs varying from 4 to 10 days. Data is presented on influent quality, effluent quality, sludge settling characteristics, nitrogen profiles in the reactors, and aeration equipment power requirements. Data is also presented on oxygen transfer tests conducted in each aeration tank. The full-scale test results are compared with predicted performance using the ASM No. 1 model within the Plan-It STOAT™ wastewater treatment simulation software.
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Document Type: Research Article

Publication date: 2003-01-01

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