Key Laboratory of Groundwater Circulation and Evolution (China University of Geosciences Beijing), Ministry of Education, Beijing 100083, China; School of Water Resources and Environment, China University of Geosciences Beijing, Beijing 100083, China.
School of Water Resources and Environment, China University of Geosciences Beijing, Beijing 100083, China.
Bioresour Technol. 2014 Nov;171:389-95. doi: 10.1016/j.biortech.2014.08.117. Epub 2014 Sep 3.
In this study, central composite design (CCD) and response surface methodology (RSM) were applied to optimize the C/N and current density in a heterotrophic/biofilm-electrode autotrophic denitrification reactor (HAD-BER). Results showed that nitrate could be effectively reduced over a wide range of C/Ns (0.84-1.3535) and current densities (96.8-370.0 mA/m(2)); however, an optimum C/N of 1.13 and optimum current density of 239.6 mA/m(2) were obtained by RSM. Moreover, the HAD-BER performance under the optimum conditions resulted in almost 100% nitrate-N removal efficiency and low nitrite-N and ammonia-N accumulation. Furthermore, under the optimum conditions, H2 generated from water electrolysis matched the CO2 produced by heterotrophic denitrification by stoichiometric calculation. Therefore, CCD and RSM could be used to acquire optimum operational conditions and improve the nitrate removal efficiency and energy consumption in the HAD-BER.
在这项研究中，中心组合设计（CCD）和响应面法（RSM）被应用于优化异养/生物膜电极自养反硝化反应器（HAD-BER）中的 C/N 和电流密度。结果表明，硝酸盐可以在很宽的 C/N（0.84-1.3535）和电流密度（96.8-370.0 mA/m²）范围内有效地被还原；然而，通过 RSM 得到了最佳的 C/N 为 1.13 和最佳的电流密度为 239.6 mA/m²。此外，在最佳条件下，HAD-BER 的性能导致几乎 100%的硝酸盐-N去除效率和低的亚硝酸盐-N 和氨氮-N 积累。此外，在最佳条件下，根据化学计量计算，由水电解产生的 H2 与异养反硝化产生的 CO2 相匹配。因此，CCD 和 RSM 可以用来获得最佳的操作条件，提高 HAD-BER 中的硝酸盐去除效率和能源消耗。
