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- W2014736856 abstract "In this paper, the efficacy of a full-scale three-stage downflow reed bed treatment system employing water recirculation was examined for the treatment of medium strength waste effluent with an average BOD5 of 464 mg l−1 and ammoniacal-nitrogen of 253.2 mg l−1. Different methods of dosing the sub-beds in the downflow stages were first tested. Dosing half of the sub-beds in a stage for 3–4 days per week while the others were resting gave a satisfactory operation. In the main experimental trials with recirculation the average BOD5 of the influent was reduced by 99.1% from 464 to 4 mg l−1, whereas COD was reduced by 70.1% from 1006 to 271 mg l−1. About 95% of the suspended solids (SS) were removed in the downflow system. Considerable PO4-P reduction was also obtained. NH4-N was reduced by 61.7% from 253.2 to 96.9 mg l−1 with nitrification proving to be the predominant removal process. Significant nitrification, accompanied by an obvious decrease in pH, occurred when the BOD5 level dropped to 100 mg l−1. This process was dramatically improved after the BOD5 was further reduced to less than 50 mg l−1. The nitrification appeared to be inhibited by a low pH value of 5.6 in the third stage. The average oxygen consumption rates in the first, second and third stages were 57.1, 122.5 and 48.7 g m−2 d−1, respectively, where m2 representS the total area of each stage. Recirculating the effluents around the downflow stages greatly improved the O2 consumption by the microorganisms." @default.
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- W2014736856 date "1998-05-01" @default.
- W2014736856 modified "2023-10-18" @default.
- W2014736856 title "Treatment of Agricultural and Domestic Effluents in Constructed Downflow Reed Beds Employing Recirculation" @default.
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- W2014736856 doi "https://doi.org/10.1080/09593331908616709" @default.
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