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- W1992309230 abstract "Abstract This paper includes the results of an experimental investigation carried out on thickening of excess sludge to observe the phosphate behaviour in the presence and absence of nitrate and to study the effect of the wastewater treatment process on sludge properties which have a great influence on phosphate release to the supernatant of gravity thickeners. The main results obtained are as follows: (1) the rate of phosphate release under anaerobic conditions is influenced by the chemicals which are used in the aeration tank to precipitate P. In case of no P precipitation, the P released to the supernatant after 24 h detention time (DT) was about 6% of the influent P load of the wastewater treatment plant; (2) as initial nitrate concentration increases, the phosphate release rate decreases; (3) up to a DT of 12 (sludge age, 3.5 days) to 20 h (30 days), the N release to the supernatant is rather low and can be neglected in regard to the wastewater treatment process; (4) a DT of less than 18–24 h is advantageous in regard to nutrient release for thickening of ES in case of activated sludge treatment plant without primary sedimentation process." @default.
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- W1992309230 date "1994-10-01" @default.
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- W1992309230 title "The effect of nitrate and treatment process on phosphate release in batch gravity thickener" @default.
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- W1992309230 doi "https://doi.org/10.1016/0043-1354(94)90033-7" @default.
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