Notice of RetractionComparative Study of Actual Coking Wastewater Treatment in Micro-Aerobic EGSB Reactor for Continuous and Intermittent Oxygenation

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The objectives of this works were the examination of the performance of different oxygenation ways for the micro aerobic EGSB reactor treating actual coking wastewater, two oxygenation methods i.e. A and B were employed. For method A, dissolved O₂ was supplied to the reactor A (RA) through a continuous oxygenation way, and for method B, the intermittent oxygenation way was used and different dissolved O₂ was supplied to the granule sludge bed in the reactor B (RB). Superficial flow rate and recycle ratio of 3.0m·h^-1 and 22.3 were employed to offer a suitable hydraulic condition. The OLR was 1.1-2.4kgCOD·m^-3·d^-1 with an influent flow of 1.0L·h^-1 and a HRT of 12.0h. With influent COD, phenols, cyanide (CN), thiocyanate (SCN) and ammonia (NH₃) concentration of 555-1220, 10.1-93.2, 0.26-61.2, 66.7-161.3 and 74.1-263.1mg·L^-1, in RA, the COD, phenols, CN, SCN and NH₃ removal efficiency were 73.8, 99.8, 97.5, 88.7 and 32.6%, and only 63.4, 99.3, 97.0, 46.0 and 10.1% for RB. Moreover, in RA, larger granules and higher sludge concentration could attain, the percentage of granules with d>;0.45mm and d>;1.0mm was 40.6% and 26.5% along with 24.2gVSS·L^-1, and only 26.5%, 5.2% and 14.9 gVSS·L^-1 for RB. The experimental results showed that both methods could run well when treating actual coking wastewater. Nevertheless, the RA could have comparat- vely high and stable operation effect.