针对小型企业工业炉窑VOCs低浓度、不连续的排放特点,以商用活性炭为吸附材料,采用自制Pd-Ce/Al2O3双元催化剂开展工业炉窑VOCs废气吸附-脱附-催化一体化净化技术研究,通过BET、SEM和TG表征手段对吸脱附再生前后的活性炭进行表征测试。...针对小型企业工业炉窑VOCs低浓度、不连续的排放特点,以商用活性炭为吸附材料,采用自制Pd-Ce/Al2O3双元催化剂开展工业炉窑VOCs废气吸附-脱附-催化一体化净化技术研究,通过BET、SEM和TG表征手段对吸脱附再生前后的活性炭进行表征测试。以甲苯为探针分子,考察不同脱附时间、烟气稀释倍数、催化温度及烟气循环次数对该工艺净化甲苯废气性能的影响。研究表明100℃下热脱附1 h即可将吸附物质基本脱除,催化温度为320℃时,甲苯即可完全催化氧化;系统循环操作10~15次后,活性炭材料在100℃下焙烧6 h进行彻底再生,具有最好的经济效益。表征结果表明,经多次热再生后,活性炭孔道存在部分坍塌,比表面积由889 m 2/g降至688 m 2/g,孔容由0.50 mL/g降至0.37 mL/g,孔径无明显变化,均在2.2 nm左右;这与SEM观察到的活性炭表面褶皱减少相吻合,说明多次热再生后活性炭孔道存在一定程度的坍塌,但依然保持介孔特性;TG曲线中再生后活性炭失重曲线略低于新鲜活性炭,进一步证明多次热再生对活性炭孔道结构存在一定的破坏性。展开更多
目的探讨基于风险控制的一体化管理对血液净化导管相关性血流感染(catheter related blood stream infection,CRBSI)的预防作用。方法选取亳州市某医院2019年4月—2020年9月接受血液净化治疗的92例患者,采取随机数字表法分为研究组和对...目的探讨基于风险控制的一体化管理对血液净化导管相关性血流感染(catheter related blood stream infection,CRBSI)的预防作用。方法选取亳州市某医院2019年4月—2020年9月接受血液净化治疗的92例患者,采取随机数字表法分为研究组和对照组。对照组采用常规管理,研究组在常规管理基础上采用基于风险控制的一体化管理。对比两组患者对CRBSI健康防控知识的认知状况,预防CRBSI的依从性、CRBSI的发生率及对管理模式和人员的满意度。结果与管理前相比,管理后研究组对CRBSI健康防控知识的认知状况更高,两组差异有统计学意义(t研究组=28.667、34.428、24.808,t对照组=25.601、22.378、23.630,t管理后组间=7.696、6.824、5.492,P<0.05);研究组依从性优良率高于对照组,两组差异有统计学意义(χ^(2)=4.696,P<0.05);研究组的CRBSI总发生率低于对照组,两组差异有统计学意义(χ^(2)=4.696,P<0.05);研究组对管理模式和人员的满意度高于对照组,两组差异有统计学意义(t=8.635、8.981、7.657、9.620、10.189、8.077,P<0.05)。结论采用基于风险控制的全过程一体化管理可提高患者对CRBSI健康防控知识的认知度和治疗依从性,降低CRBSI发生率,提高患者对管理模式和管理人员的满意度。展开更多
[Objective]The activities of urease and phosphatase in integrated vertical flow constructed wetland and purification effect of black and malodorous river were studied.[Method]Honeycomb stone and soft filler were used ...[Objective]The activities of urease and phosphatase in integrated vertical flow constructed wetland and purification effect of black and malodorous river were studied.[Method]Honeycomb stone and soft filler were used as matrix,the biological grid integrated vertical flow constructed wetland system was built to strengthen treatment for black and malodorous river,and the activities of urease and phosphatase of two fillers in different functional areas of constructed wetland were tested to study the film formation property of two fillers in different functional areas.[Result]Both urease and phosphatase activities on biofilm of soft filler were significantly higher than on biofilm of honeycomb stone filler;indicating that choosing soft filler was more advantageous to the growth of biofilm;and urease activity had significant correlation with total nitrogen removal rate,while phosphatase activity had no significant correlation with total phosphorus removal rate.[Conclusion]This study provided evidences for utilizing the activities of urease and phosphatase to evaluate the purification effect of black and malodorous river and choose appropriate filler.展开更多
文摘针对小型企业工业炉窑VOCs低浓度、不连续的排放特点,以商用活性炭为吸附材料,采用自制Pd-Ce/Al2O3双元催化剂开展工业炉窑VOCs废气吸附-脱附-催化一体化净化技术研究,通过BET、SEM和TG表征手段对吸脱附再生前后的活性炭进行表征测试。以甲苯为探针分子,考察不同脱附时间、烟气稀释倍数、催化温度及烟气循环次数对该工艺净化甲苯废气性能的影响。研究表明100℃下热脱附1 h即可将吸附物质基本脱除,催化温度为320℃时,甲苯即可完全催化氧化;系统循环操作10~15次后,活性炭材料在100℃下焙烧6 h进行彻底再生,具有最好的经济效益。表征结果表明,经多次热再生后,活性炭孔道存在部分坍塌,比表面积由889 m 2/g降至688 m 2/g,孔容由0.50 mL/g降至0.37 mL/g,孔径无明显变化,均在2.2 nm左右;这与SEM观察到的活性炭表面褶皱减少相吻合,说明多次热再生后活性炭孔道存在一定程度的坍塌,但依然保持介孔特性;TG曲线中再生后活性炭失重曲线略低于新鲜活性炭,进一步证明多次热再生对活性炭孔道结构存在一定的破坏性。
文摘目的探讨基于风险控制的一体化管理对血液净化导管相关性血流感染(catheter related blood stream infection,CRBSI)的预防作用。方法选取亳州市某医院2019年4月—2020年9月接受血液净化治疗的92例患者,采取随机数字表法分为研究组和对照组。对照组采用常规管理,研究组在常规管理基础上采用基于风险控制的一体化管理。对比两组患者对CRBSI健康防控知识的认知状况,预防CRBSI的依从性、CRBSI的发生率及对管理模式和人员的满意度。结果与管理前相比,管理后研究组对CRBSI健康防控知识的认知状况更高,两组差异有统计学意义(t研究组=28.667、34.428、24.808,t对照组=25.601、22.378、23.630,t管理后组间=7.696、6.824、5.492,P<0.05);研究组依从性优良率高于对照组,两组差异有统计学意义(χ^(2)=4.696,P<0.05);研究组的CRBSI总发生率低于对照组,两组差异有统计学意义(χ^(2)=4.696,P<0.05);研究组对管理模式和人员的满意度高于对照组,两组差异有统计学意义(t=8.635、8.981、7.657、9.620、10.189、8.077,P<0.05)。结论采用基于风险控制的全过程一体化管理可提高患者对CRBSI健康防控知识的认知度和治疗依从性,降低CRBSI发生率,提高患者对管理模式和管理人员的满意度。
基金Supported by National Major Science and Technology Projects(2009ZX07317-006)National Major Science and Technology Projects(2009ZX07317-009)~~
文摘[Objective]The activities of urease and phosphatase in integrated vertical flow constructed wetland and purification effect of black and malodorous river were studied.[Method]Honeycomb stone and soft filler were used as matrix,the biological grid integrated vertical flow constructed wetland system was built to strengthen treatment for black and malodorous river,and the activities of urease and phosphatase of two fillers in different functional areas of constructed wetland were tested to study the film formation property of two fillers in different functional areas.[Result]Both urease and phosphatase activities on biofilm of soft filler were significantly higher than on biofilm of honeycomb stone filler;indicating that choosing soft filler was more advantageous to the growth of biofilm;and urease activity had significant correlation with total nitrogen removal rate,while phosphatase activity had no significant correlation with total phosphorus removal rate.[Conclusion]This study provided evidences for utilizing the activities of urease and phosphatase to evaluate the purification effect of black and malodorous river and choose appropriate filler.