为确定连续流好氧颗粒污泥反应器水流特性及亚硝化影响因素,脉冲加入示踪剂N aC l,测定出水电导率。试验结果表明,反应器流态接近推流型,属非理想流态。对温度、pH值、溶解氧DO、碳氮比C/N、水力停留时间HRT等影响亚硝化的主要操作条件...为确定连续流好氧颗粒污泥反应器水流特性及亚硝化影响因素,脉冲加入示踪剂N aC l,测定出水电导率。试验结果表明,反应器流态接近推流型,属非理想流态。对温度、pH值、溶解氧DO、碳氮比C/N、水力停留时间HRT等影响亚硝化的主要操作条件进行了单因素试验。在此基础上,根据数学最优化原理对影响因素进行正交试验。结果表明,对亚硝化产生影响的各操作条件依次为pH值、温度、HRT、DO、C/N比,各因子最优水平组合为pH=8.0、t=29℃、DO=1.0 m g/L、HRT=15 h、C/N=5。在此操作条件下,反应器连续运行1个月,亚硝酸氮累积率平均达到90%以上,氨氮、COD去除率分别达到85%及90%以上。展开更多
Multinucleax solid-state NMR was employed to study the silicon-substitutedmolecular sieve Si-VPI-5. 29Si and 27Al NMR suggest that Si can be incorporated intothe framework of VPI-5 and the substitution of two silicon ...Multinucleax solid-state NMR was employed to study the silicon-substitutedmolecular sieve Si-VPI-5. 29Si and 27Al NMR suggest that Si can be incorporated intothe framework of VPI-5 and the substitution of two silicon atoms for an aluminium atomplus a phosphorus atom is predominant. Such substitution is limited in a certain domainof the crystal and "silicon rich" regions are thus generated. 1H MAS spectra reveal that asmall arnount of silicon atoms substitute phosphorus only and SiOHAl groups are formed,which provides the acidic source for the molecular sieves. Si-VPI-5 prepared with silicagel as the silicon source exhibits a higher content of SiOHAl groups than that preparedwith (EtO)4Si.展开更多
文摘为确定连续流好氧颗粒污泥反应器水流特性及亚硝化影响因素,脉冲加入示踪剂N aC l,测定出水电导率。试验结果表明,反应器流态接近推流型,属非理想流态。对温度、pH值、溶解氧DO、碳氮比C/N、水力停留时间HRT等影响亚硝化的主要操作条件进行了单因素试验。在此基础上,根据数学最优化原理对影响因素进行正交试验。结果表明,对亚硝化产生影响的各操作条件依次为pH值、温度、HRT、DO、C/N比,各因子最优水平组合为pH=8.0、t=29℃、DO=1.0 m g/L、HRT=15 h、C/N=5。在此操作条件下,反应器连续运行1个月,亚硝酸氮累积率平均达到90%以上,氨氮、COD去除率分别达到85%及90%以上。
文摘Multinucleax solid-state NMR was employed to study the silicon-substitutedmolecular sieve Si-VPI-5. 29Si and 27Al NMR suggest that Si can be incorporated intothe framework of VPI-5 and the substitution of two silicon atoms for an aluminium atomplus a phosphorus atom is predominant. Such substitution is limited in a certain domainof the crystal and "silicon rich" regions are thus generated. 1H MAS spectra reveal that asmall arnount of silicon atoms substitute phosphorus only and SiOHAl groups are formed,which provides the acidic source for the molecular sieves. Si-VPI-5 prepared with silicagel as the silicon source exhibits a higher content of SiOHAl groups than that preparedwith (EtO)4Si.
