Removal of Dissolved Organic Matter by Chemical-Biological Flocculation Process
A study was made on the characteristics of the molecular weight distribution and the removal of the dissolved organic matter in the Chemical-Biological Flocculation Process(CBFP).Chemically enhanced primary treatment process,primary sedimentation tank process and secondary treatment process were taken as the parallel-compared wastewater treatment processes.The experimental results show that the removal rates of the dissolved organic matter and UV_(260) are 45.9% and 38.7% respectively,and the organics with molecular weight more than 2 ku are significantly reduced in CBFP.Compared with the biological secondary treatment process,CBFP has weaker capability in removing the dissolved organic matter.The dissolved organic matter is removed through chemical flocculation and biological adsorption in CBFP.
The work described in this paper was begun in order to see if a similar relationship could be observed at the Coleshill works of the Birmingham Tame and Rea District Drainage Board. Intensive work was first carried out for one month, during which daily counts of the total peritrichous ciliates and total free-swimming ciliates were compared with the B.O.D. and the O.A. (oxygen absorbed from permanganate in 4 hr.) of the effluent. Later, bi weekly counts were carried out for more than a year. These counts were made on the different dominant genera of the peritrichous and free-swimming ciliates in order to try and relate pro