3BER反应器极板面积和布置形式对脱氮效果的影响

为提高三维电极生物膜工艺(3BER)脱氮效率及出水水质,通过增大极板面积、减少极板间距、改变电极布置形式,构建了新型三维电极生物膜反应器(3BER-NC)用于城市污水厂尾水深度脱氮处理,研究了电流、进水pH和籽( C)/籽( N)对其运行效果的影响,并分析了系统中反硝化菌群分布特征. 研究结果表明:减少极板间距能减缓碳棒阳极电解,出水色度低,能在较高的电流下运行,3BER-NC最佳运行电流为200 mA,比3BER反应器高出100 mA. 增大极板面积和改变极板位置分布有利于反硝化反应的进行,TN平均去除率提高约37. 74℅. 电流强度、进水pH和籽(C)/籽(N)对系统脱氮效果均有较大影响,在不同运行条件下3BER-NC体系的脱氮效率均优于3BER.在3BER-NC体系中β变形菌起主导作用,脱氮主要是由异养和自养反硝化菌共同作用的结果.

Influence of Electrode Plate Area and Arrangement of 3BER Reactor on the Nitrogen Removal

In order to improve the nitrogen removal efficiency and effluent quality of the three-dimensional electrode biofilm process (3BER), a new designed 3BER-NC process through expanding the area of electrode plate, reducing the electrode space and changing the electrode arrangement was applied and the effect of current, influent pH and 籽( C)/籽( N) on the performance and denitrifying bacteria in system were studied in deep denitrification of the tail water from a municipal wastewater treatment plant. The research results showed that the 3BER-NC operated with an optimal current at 200 mA, which was 100 mA higher than that of 3BER. Because of its shorter electrode space, the 3BER-NC can slow down the carbon electrolysis and effluent color. Furthermore, the enlargement of electrode plate and the change of electrode position distribution of the 3 BER-NC improved the TN removal rate to 86. 45℅, which was 37. 74℅ higher than that of 3BER. The current intensity, influent pH and 籽( C )/籽( N ) had great influence on the nitrogen removal at different current and the nitrogen removal efficiency of 3 BER-NC was better than 3BER. In the nitrogen removal system of the 3BER-NC, the β-proteobacteria played a leadingrole with a joint action of heterotrophic and autotrophic denitrifying bacteria.