Treatment of anaerobically treated domestic wastewater using rotating biological contactor

被引:19
|
作者
Tawfik, A
Klapwijk, B
El-Gohary, F
Lettinga, G
机构
[1] Natl Res Ctr, Dept Water Pollut Control, Cairo 12622, Egypt
[2] Univ Wageningen, Sub Dept Environm Technol, NL-6700 EV Wageningen, Netherlands
关键词
COD; E; coli; nitrification; post-treatment; RBC; recirculation;
D O I
10.2166/wst.2002.0371
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A small-scalp 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 post-treatment process. The remaining COD in the final effluent was only 51 ( 7) mgl(-1). Ammonia concentration was reduced by 67 (+/- 7.6) %. The overall E coli reduction was 1.39 log(10),at an influent count of 6.5 log(10) corresponding to an overall removal efficiency of 95.8(+/- 4.7)%. However, 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) % and 92 ( 6.5) % respectively. At a HRT of 10 h, recirculation of the 3rd stage effluent to the 1 st 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 1 st stage increased ammonia removal in the stage 1 from 23,to 43%. This relatively high ammonia removal likely can be attributed to the supply of nitrifiers from 3rd stage to the 1 st one.
引用
收藏
页码:371 / 376
页数:6
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