Removal Effect of 4 Bio-grids on Nitrogenous Pollutants in Waters

YU Sheng; LI Bang-yu; CHEN Yi-hu

doi:10.3969/j.issn.1008-5475.2015.01.003

Abstract：In order to understand the removal effect of the 4 bio-fillers on Kjeldahl nitrogen (KN) and total nitrogen (TN) in river waters,the experiment is conducted under the conditions of 20%-80% of filling rate and 5-20 h of hydraulic retention time (HRT). The effect of 4 bio-fillers on KN and TN removal is obvious. Although the removal effect of 3# bio-filler on KN is promoted at 20%-80% of filling rates,the no correlation is found between the filling rates and the removal effect of 1#,2# and 4# bio-fillers on KN (p<0.05). For TN,2# bio-filler can eliminate more TN than 1# and 4# bio-fillers (the next in effect) and 3# bio-filler (the most inferior) with the same HRT and filling rates. Except 3# bio-filler,the positive correlations are observed between filling rates and the TN removal amounts to other bio-fillers. The concentration of microorganism is from 1.1 g/L to 3.4 g/L which makes the TN removal more rapid within 20-60% of filling rate. Meanwhile,when the concentration of microorganism is from 3.4 g/L to 4.5 g/L within 60-80% of filling rates,the flow resistance is increased to hinder some removal abilities which means that the internal bio-fillers can not have the chances to contact the contaminated waters directly. It is indicated that the removal effects of 4 bio-fillers on KN and TN are not more efficient at the 60%and 80%of filling rates (p<0.05). Thus,the 60%of filling rates of the 4 bio-fillers are able to decrease and control the KN and TN pollutants of river water.