The character and biological treatability of log pond waters Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/tx31qm71f

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  • A study was conducted to determine the chemical nature and the biological treatability of log pond water. Various analyses including total solids, volatile solids, suspended solids, dissolved oxygen, pH, COD, BOD₅, BOD₂₀, total Kjeldahl nitrogen, nitrate nitrogen, phosphate, and PBI were performed on water samples from each of the four ponds studied. Each pond proved to be homogeneous with respect to these analyses. Factors such as log storage time and overflow rate were found to affect the chemical nature of the log ponds. All the ponds had very low five-day biochemical oxygen demand (BOD₅) values in comparison to their respective chemical oxygen demand (COD) values, indicating high concentrations of non-biodegradable substances. The log ponds contained sufficient nitrogen and phosphorus to support biological activity. Two bench scale extended aeration units were used for the biological treatability study. The log pond water was fed to the units h contained acclimated sludge and this mixture was aerated. The aeration units performed quite well and produced similar results, Generally, the longer the detention time, the higher the COD, BOD₅ and PBI removals. However, these removals tended to level off at the five-day detention period so a further increase in detention time would not have increased the removals substantially. The following removals were obtained with a five-day detention time: total COD = 63%, soluble COD = 52%, BOD₅ = 93%, PBI = 64%. The mixed liquor suspended solids (MLSS) level ranged from 380 mg/1 at a five-day contact period to 1060 mg/1 at a one-day contact time. The oxygen uptake of the MLSS was only 3.1 mg 02 per hour gram MLSS. The unitless oxygen transfer parameter, a, was found to be 1. I for log pond water demonstrating that the rate of oxygen transfer into log pond water was greater than into distilled water. The results of this study clearly indicate that log pond water can be effectively treated using aerobic biological processes.
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