Application of a CO2-stripping system for calcium removal to upgrade organic matter removal and sludge granulation in a leachate-fed EGSB bioreactor
Application of a CO2-stripping system for calcium removal to upgrade organic matter removal and sludge granulation in a leachate-fed EGSB bioreactor
复制标题
应用 CO2 汽提系统去除钙，以升级渗滤液供给的 EGSB 生物反应器中的有机物去除和污泥颗粒化
DOI：
10.1039/c5ra26444h
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发表时间：
2016
期刊：
影响因子：
3.9
通讯作者：
Li Yu-You
中科院分区：
文献类型：
--
作者：
Lu Xueqin;Chen Shanping;Luo Jinghuan;Qian Guangren;Liu Jianyong;Zhen Guangyin;Li Yu-You
研究了CO2吹脱钙系统在渗滤液补料EGSB生物反应器中的应用。采用三维激发-发射矩阵（3D-EEM）光谱结合平行因子分析（PARAFAC）方法研究了反应器运行过程中出水溶解性有机物（DOM）的变化。采用X射线衍射（XRD）、傅里叶变换红外（FT-IR）和扫描电子显微镜（SEM）等分析手段，研究了CO2汽提装置对颗粒微观结构的影响。CO2汽提系统的引入降低了钙浓度，同时提高了甲烷的释放。在有CO2吹脱装置的生物反应器中，甲烷产率达到0.33 L CH 4/g COD，而没有CO2吹脱装置的生物反应器中甲烷产率为0.31 L CH 4/g COD。在稳态条件下，组合系统对化学需氧量（COD）和总氮（TN）的去除率分别为80%和50-60%，比对照分别提高6.3%和41.0%。通过3D-EEM-PARAFAC分析，从废水样品中鉴定出三种荧光组分，分别为色氨酸类蛋白（组分1，Ex/Em = 275-280/355-365 nm）和类腐殖酸物质（组分2，Ex/Em = 240（295，340）/450 nm和组分3，Ex/Em = 320/320 nm）。组分表征证实了CO2吹脱单元对DOM转化的有利影响。通过XRD、FT-IR和SEM分析表明，该装置的使用通过去除钙离子减轻了颗粒的失活，这可能是EGSB性能提高的核心原因。
The application of CO2-stripping system for calcium removal to upgrade organic matter removal and sludge granulation in a leachate-fed EGSB bioreactor was evaluated. Three-dimensional excitation–emission matrix (3D-EEM) spectroscopy combined with parallel factor (PARAFAC) analysis was used to characterize the transformation of the effluent dissolved organic matter (DOM) during the operation. X-ray diffraction (XRD), Fourier-transform infrared (FT-IR) and scanning electronic microscopy (SEM) were used to assess the effects of a CO2-stripping unit on the microstructure of the granules. The introduction of the CO2-stripping system reduced the calcium concentration while upgrading methane evolution. The methane yield reached 0.33 L CH4 per g CODremoved in the bioreactor with the CO2-stripping unit compared with 0.31 L CH4 per g CODremoved without the unit as the control. The combined system produced 80% and 50–60% chemical oxygen demand (COD) and total nitrogen (TN) removal under steady-state conditions, which were 6.3% and 41.0% higher than those of the control, respectively. With 3D-EEM-PARAFAC analysis, three fluorescence components, associated as tryptophan protein-like (component 1, Ex/Em = 275–280/355–365 nm) and humic-like substances (component 2, Ex/Em = 240(295, 340)/450 nm and component 3, Ex/Em = 320/320 nm), were identified from the effluent samples. The componential characterizations confirmed the favorable influence of the CO2-stripping unit on the transformation of DOM. Further analysis through XRD, FT-IR and SEM demonstrated that the use of the unit alleviated inactivation of the granules through removing calcium, which might be the core reason for the enhancement of the EGSB performance.