Water treatment of polluted rivers in cities based on biological filter technology

Abstract

As one of the black and odorous water treatment bioremediation technologies, the biological filter has been widely used due to its high efficiency, low cost and no secondary pollution. It has achieved certain effects when repairing black and odorous water bodies in some areas of my country. In this paper, two sets of multi-media biological filters were designed and the carrier was modified to strengthen the performance of the carrier and effectively remove the chemical oxygen demand (COD), total nitrogen (TN), dissolved organic matter (DOM) and other pollutants in the black and odorous water. In this paper, the biological carriers on the market were modified The method studied the Biofilter 1 system based on the modified biological carrier and the Biofilter 2 system based on the unmodified carrier on the market under different hydraulic loading rate (HLR) conditions. Next, the removal effect of conventional pollutants (COD, TOC, TN, NH 4 ), and the influence on the composition and structural characteristics of DOM are analyzed, and the removal mechanism of pollutants is analyzed. By comparing the operating effects of BF1 and BF2, it is found that with the increase of HLR, the pollutant removal rate of the two systems both increased first and then decreased. The removal effect of BF1 was better than that of BF2, and the impact load resistance of the modified carrier in the BF1 system was stronger than that of the unmodified BF2 system. • Two sets of multi-media biological filters are designed in this paper. • We study the removal effect of conventional pollutants by biological filter technology. • We study the influence on the composition of DOM by biological filter technology.