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• W1789539088 abstract "With better spill control and lower carbon loads to the treatment system, there is excess aeration occurring at the lagoon. This leads to unnecessary power costs, especially during peak demand summer periods. A study was conducted to determine lagoon performance so as to prioritize which aerators could be shut off and under what conditions. The two ma­ jor elements of the study were (a) detailed lithium tracer work to identify the relatively stagnant zones in the pond, and (b) a ra­ diotracer study to measure BOD loss in different parts of the system. Based on these results, it was concluded that about 15% of aeration capacity could be cur­ tailed during routine operations. BOD and COD profiles taken before and after this 15% reduction showed no deterioration in effluent quality. Baseline BOD and COD profiles at vari­ ous aerators Samples were collected on 2.15.96 from various locations across the lagoon (Fig. 1) in order to establish the baseline degradation profile of the pond. BOD and COD was determined, and the results are illustrated in Figures 2 and 3, which are annotated with the aerator numbers. The first location 0 refers to the region prior to the pre-settling zone, and R is the river. The other locations are evenly 303 John T. Welsh Manager EPRI Atlanta, GA Robert W. Sackellares Senior Consultant Georgia-Pacific Corp. Atlanta, GA spaced throughout the pond. It is clear that the bulk of the reduction occurs in the front end, with the aerators at the back of the lagoon contributing little. Lithium tracer work at Brunswick A lithium tracer study was con­ ducted at Brunswick in order to determine flow patterns, estimate hydraulic residence time and dispersion number for the pond, and, in particular, to identify any dead zones so that aerators sited in these regions could be moved to positions where they can be more efficiently utilized. Primary treatment at Brunswick is provided in a 12.3 million gallon Oorr­ Oliver clarifier. Secondary treatment oc­ curs in two pre-settling basins each of sur­ face area of about 5 acres, an ASB of 122 acres, and a post-settling basin of 12.4 acres. Theoretical detention times for the pre-settling basins, ASB, and the post­ settling basins are calculated to be around 0.3 days, 12.5 days, and 1.25 days, re­ spectively, based on an average flow rate of 38 mgd, a depth of 4 feet, for the pre­ settling basins and 12 feet for the ASB and the post-stabilization zone. Sixty two aerators provide tapered aeration to the ASB, the effluent from which is re oxygen­ ated and discharged into Turtle River. The reoxygenation system transfers about 20,000 Ibs/day of oxygen to the river. ESL-IE-97-04-47 Proceedings from the Nineteenth Industrial Energy Technology Conference, Houston, TX, April 23-24, 1997" @default.
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• W1789539088 date "1997-04-01" @default.
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• W1789539088 title "Optimizing Aeration in Pulp Mill Secondary Treatment Systems" @default.
• W1789539088 hasPublicationYear "1997" @default.
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