【目的】针对高浑浊度矿井水处理技术存在处理工序长、超滤(UF)膜进水水质要求高、膜污染严重的问题,采用短流程超滤膜化学反应器(MCR)组器处理高浑浊度矿井水。【方法】在保留短流程超滤MCR工艺精简、集成度高、占地面积小的优势基础上...【目的】针对高浑浊度矿井水处理技术存在处理工序长、超滤(UF)膜进水水质要求高、膜污染严重的问题,采用短流程超滤膜化学反应器(MCR)组器处理高浑浊度矿井水。【方法】在保留短流程超滤MCR工艺精简、集成度高、占地面积小的优势基础上,对短流程超滤MCR技术的抗污染膜组器型式进行改进,探究高效膜污染控制组器型式;并对改进后组器的运行参数开展试验研究,通过优化运行通量、系统回收率、运行周期、反洗通量4个运行参数,考察不同运行条件对膜污染控制效果,从而确定抗污染膜组器的稳定运行参数,通过进水悬浮物浓度,考察短流程超滤MCR组器的进水条件。【结果】结果表明,短流程超滤MCR组器中振动模式的抗污染性能优于曝气模式,跨膜压差(TMP)低于曝气模式0.16~0.26 k Pa/d。而在振动模式中,线性振动模式TMP低于旋转振动模式0.5 k Pa/d,表明线性振动模式抗污染能力强,且线性振动模式的吨水能耗为0.03 k W·h、水阻能耗占比为28.8%,均优于旋转振动模式。此外,线性振动模式短流程超滤MCR组器在运行通量≤40L/(m^(2)·h),系统回收率≤97%,运行周期为45 min,反洗通量为60 L/(m^(2)·h)条件下,能保证膜抗污染效果,短流程超滤MCR组器进水耐受悬浮物质量浓度达到2000 mg/L,运行参数调整对产水水质无显著影响。【结论】振动模式短流程超滤MCR组器可有效减少处理工艺流程,放宽UF膜进水水质要求,缓解UF膜运行过程中膜污染的情况,可为高浑浊度矿井水工艺改造提供技术指导。展开更多
Vibrational spectroscopy(ATR-FTIR and Raman) was used to investigate the interaction and conformation transition in the blend films of silk fibroin(SF) and silk-protein like polymers(P1, P2) containing the oligopeptid...Vibrational spectroscopy(ATR-FTIR and Raman) was used to investigate the interaction and conformation transition in the blend films of silk fibroin(SF) and silk-protein like polymers(P1, P2) containing the oligopeptide segments[(Ala) 4, GlyAlaGlyAla] which derived from the crystal region of spider dragline silk and silkworm(Bombyx mori) silk. The results revealed that the intermolecular hydrogen-bond interaction, which was formed between the molecular chains of SF and the oligopeptide segments in P1 and P2, induced a partial random coil/α-helix conformation transfer to β-sheet conformation after blending. And β-sheet and random coil/α-helix conformation coexisted in the SF/P1 and SF/P2 blend films, while the predominant conformations in the pure SF and P1 films were random coil/α-helix. These conclusions would be significant for artificial spinning of the regenerated silk fibroin.展开更多
文摘【目的】针对高浑浊度矿井水处理技术存在处理工序长、超滤(UF)膜进水水质要求高、膜污染严重的问题,采用短流程超滤膜化学反应器(MCR)组器处理高浑浊度矿井水。【方法】在保留短流程超滤MCR工艺精简、集成度高、占地面积小的优势基础上,对短流程超滤MCR技术的抗污染膜组器型式进行改进,探究高效膜污染控制组器型式;并对改进后组器的运行参数开展试验研究,通过优化运行通量、系统回收率、运行周期、反洗通量4个运行参数,考察不同运行条件对膜污染控制效果,从而确定抗污染膜组器的稳定运行参数,通过进水悬浮物浓度,考察短流程超滤MCR组器的进水条件。【结果】结果表明,短流程超滤MCR组器中振动模式的抗污染性能优于曝气模式,跨膜压差(TMP)低于曝气模式0.16~0.26 k Pa/d。而在振动模式中,线性振动模式TMP低于旋转振动模式0.5 k Pa/d,表明线性振动模式抗污染能力强,且线性振动模式的吨水能耗为0.03 k W·h、水阻能耗占比为28.8%,均优于旋转振动模式。此外,线性振动模式短流程超滤MCR组器在运行通量≤40L/(m^(2)·h),系统回收率≤97%,运行周期为45 min,反洗通量为60 L/(m^(2)·h)条件下,能保证膜抗污染效果,短流程超滤MCR组器进水耐受悬浮物质量浓度达到2000 mg/L,运行参数调整对产水水质无显著影响。【结论】振动模式短流程超滤MCR组器可有效减少处理工艺流程,放宽UF膜进水水质要求,缓解UF膜运行过程中膜污染的情况,可为高浑浊度矿井水工艺改造提供技术指导。
文摘Vibrational spectroscopy(ATR-FTIR and Raman) was used to investigate the interaction and conformation transition in the blend films of silk fibroin(SF) and silk-protein like polymers(P1, P2) containing the oligopeptide segments[(Ala) 4, GlyAlaGlyAla] which derived from the crystal region of spider dragline silk and silkworm(Bombyx mori) silk. The results revealed that the intermolecular hydrogen-bond interaction, which was formed between the molecular chains of SF and the oligopeptide segments in P1 and P2, induced a partial random coil/α-helix conformation transfer to β-sheet conformation after blending. And β-sheet and random coil/α-helix conformation coexisted in the SF/P1 and SF/P2 blend films, while the predominant conformations in the pure SF and P1 films were random coil/α-helix. These conclusions would be significant for artificial spinning of the regenerated silk fibroin.
