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Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 319155
Title Treatment of anaerobically treated domestic wastewater using rotating biological contactor
Author(s) Tawfik, A.; Klapwijk, A.; El-Gohary, F.; Lettinga, G.
Source Water Science and Technology 45 (2002)10. - ISSN 0273-1223 - p. 371 - 176.
Department(s) Sub-department of Environmental Technology
Publication type Refereed Article in a scientific journal
Publication year 2002
Keyword(s) afvalwaterbehandeling - fecale coliformen - rioolafvalwater - ronddraaiende biologische contactbedden - biologische behandeling - waste water treatment - faecal coliforms - sewage effluent - rotating biological contactors - biological treatment
Categories Waste Water Treatment
Abstract A small-scale pilot plant consisting of a three-stage RBC has been investigated for the removal of E. coli, COD fractions and ammonia from the effluent of an UASB reactor treating domestic wastewater. The results obtained reveal that a three-stage system operated at a HRT of 3.0 h represents an effective posttreatment process. The remaining COD in the final effluent was only 51 ( /- 7) mgl(-1). Ammonia concentration was reduced by 67 ( /- 7.6) ÐThe overall E. coli reduction was 1.39 log10 at an influent count of 6.5 log10 corresponding to an overall removal efficiency of 95.8 ( /- 4.7) ÐHowever, according to prevailing standards, residual E. coli counts are still high for unrestricted reuse for irrigation purposes. When the system was operated at a HRT of 10 h, overall E. coli removal and ammonia reduction were 99.9 ( /- 0.05)nd 92 ( /- 6.5) ␛espectively. At a HRT of 10 h, recirculation of the 3rd stage effluent to the 1st stage reduced the residual of E. coli in the final effluent from 2 x 10(3) to 9.8 x 10(2)/100ml. Moreover, the recirculation of nitrified effluent from the 3rd stage to the 1st stage increased ammonia removal in the stage 1 from 23 to 43ÐThis relatively high ammonia removal likely can be attributed to the supply of nitrifiers from 3rd stage to the 1st one.
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