旨在从环境样品中筛选对富营养化水体具有良好脱氮除磷效果的好氧反硝化菌。采集福州某养猪场污水处理池中的水样。通过反硝化细菌培养基培养、BTB培养基平板分离、硝酸盐还原试验和蓝白斑筛选法、异染颗粒以及聚-β-羟基丁酸(PHB)颗粒...旨在从环境样品中筛选对富营养化水体具有良好脱氮除磷效果的好氧反硝化菌。采集福州某养猪场污水处理池中的水样。通过反硝化细菌培养基培养、BTB培养基平板分离、硝酸盐还原试验和蓝白斑筛选法、异染颗粒以及聚-β-羟基丁酸(PHB)颗粒染色试验,筛选获得两株具有脱氮除磷特性的菌株,命名为N1和N2。经16S r RNA基因序列分析,N1和N2分别属于无色杆菌属(Achromobacter.sp)和短波单胞菌属(Brevundimonas.sp)。将菌株N1和N2复配,获得脱氮除磷复合菌FIM-1。考察了菌株对人工合成污水和富营养化水体脱氮除磷的效果。结果表明,两株菌在含磷量较低的水体中,对磷的去除率较高,相对于单菌,复合菌表现出更佳的脱氮除磷效果。展开更多
The reaction cross-sections of^(238)U(n,γ)^(239)U have been experimentally determined at neutron energies of6.117±0.119 MeV,4.626±0.086 MeV,and 3.622±0.348 MeV employing the relative activation approac...The reaction cross-sections of^(238)U(n,γ)^(239)U have been experimentally determined at neutron energies of6.117±0.119 MeV,4.626±0.086 MeV,and 3.622±0.348 MeV employing the relative activation approach along with the off-line γ-ray spectroscopy method.The D(d,n)3He reaction was utilized to obtain monoenergetic neutrons of the required energy,and the^(197)Au(n,γ)^(198)Au reaction cross-sections were adopted as the referential standard to ascertain the neutron capture cross-sections of^(238)U.Furthermore,the effects of low-energy scattered neutrons,neutron fluence fluctuations,counting of geometric corrections when measuring γ-rays,and neutron and γ-ray self-absorption caused by the sample thickness have been considered and revised in the present work.For a comparison with experimental results,the cross-sections of the^(238)U(n,γ)^(239)U reaction were calculated theoretically with the original parametric TALYS-1.9 program.The experimental measurements were in contrast to previous experimental re sults and the evaluation data available for ROSFOND-2010,CENDL-3.2 and ENDF/B-VIII.0.展开更多
文摘旨在从环境样品中筛选对富营养化水体具有良好脱氮除磷效果的好氧反硝化菌。采集福州某养猪场污水处理池中的水样。通过反硝化细菌培养基培养、BTB培养基平板分离、硝酸盐还原试验和蓝白斑筛选法、异染颗粒以及聚-β-羟基丁酸(PHB)颗粒染色试验,筛选获得两株具有脱氮除磷特性的菌株,命名为N1和N2。经16S r RNA基因序列分析,N1和N2分别属于无色杆菌属(Achromobacter.sp)和短波单胞菌属(Brevundimonas.sp)。将菌株N1和N2复配,获得脱氮除磷复合菌FIM-1。考察了菌株对人工合成污水和富营养化水体脱氮除磷的效果。结果表明,两株菌在含磷量较低的水体中,对磷的去除率较高,相对于单菌,复合菌表现出更佳的脱氮除磷效果。
基金Supported by the Key Laboratory of Nuclear Data foundation (6142A08200104)。
文摘The reaction cross-sections of^(238)U(n,γ)^(239)U have been experimentally determined at neutron energies of6.117±0.119 MeV,4.626±0.086 MeV,and 3.622±0.348 MeV employing the relative activation approach along with the off-line γ-ray spectroscopy method.The D(d,n)3He reaction was utilized to obtain monoenergetic neutrons of the required energy,and the^(197)Au(n,γ)^(198)Au reaction cross-sections were adopted as the referential standard to ascertain the neutron capture cross-sections of^(238)U.Furthermore,the effects of low-energy scattered neutrons,neutron fluence fluctuations,counting of geometric corrections when measuring γ-rays,and neutron and γ-ray self-absorption caused by the sample thickness have been considered and revised in the present work.For a comparison with experimental results,the cross-sections of the^(238)U(n,γ)^(239)U reaction were calculated theoretically with the original parametric TALYS-1.9 program.The experimental measurements were in contrast to previous experimental re sults and the evaluation data available for ROSFOND-2010,CENDL-3.2 and ENDF/B-VIII.0.
