The synergetic effect and underlying mechanism of potassium ferrate(PF)with tea saponin(TS,a biosurfactant)in producing short chain fatty acids(SCFAs)from anaerobic fermentation of waste activated sludge(WAS)were expl...The synergetic effect and underlying mechanism of potassium ferrate(PF)with tea saponin(TS,a biosurfactant)in producing short chain fatty acids(SCFAs)from anaerobic fermentation of waste activated sludge(WAS)were explored in this work.Experimental results showed that 0.2 g PF(g TSS)^(-1)(total suspended solid)combined with 0.02 g TS(g TSS)^(-1) could further improve SCFAs’production,and the maximum SCFAs content reached 2008.7 mg COD L^(-1),which is 1.2 and 4.5 times higher than those with PF and TS individually added,respectively,and 5.3 times higher than that of blank WAS on Day 12.In the model substrates experiments,the degradation rates of bovine serum albumin and dextran with combination of PF and TS were 41.3%±0.1% and 48.5%±0.06%,respectively,on Day 3,which are lower than those in blank WAS(with degradation rates of 72.3%±0.5%and 90.3%±0.3%).It was revealed that the oxidative effect of PF and the solubilization of TS caused more organic matters to be dissolved out from WAS,providing a large number of biodegradable substances for subsequent SCFAs production.While WAS pretreated with the combination of PF and TS,the relative abundances of Firmicutes increased from 6.4%(blank)to 38.6%,and that of Proteobacteria decreased from 41.8%(blank)to 21.8%.The combination of PF and TS promoted the hydrolysis process of WAS by enriching Firmicutes,and then increased acetic acid production by inhibiting Proteobacteria that consumed SCFAs.Meanwhile,at the genus level,acidogenesis bacteria(e.g.,Proteiniclasticum and Petrimonas)were enriched whereas SCFAs consuming bacteria(e.g.,Dokdonella)were inhibited.展开更多
目的:探讨全髋关节置换术的CroweⅢ-Ⅳ型发育性髋关节发育不良(developmental dysplasia of the hip,DDH)患者的满意度及造成不满意的相关因素。方法:回顾性分析2013年3月至2018年3月行全髋关节置换术的169例CroweⅢ-Ⅳ型DDH患者,通过...目的:探讨全髋关节置换术的CroweⅢ-Ⅳ型发育性髋关节发育不良(developmental dysplasia of the hip,DDH)患者的满意度及造成不满意的相关因素。方法:回顾性分析2013年3月至2018年3月行全髋关节置换术的169例CroweⅢ-Ⅳ型DDH患者,通过微信进行调查问卷,调查患者对手术总体满意度、10项日常功能满意度和患者认为对自己日常生活影响比较大的前5个问题。手术前后采用髋关节Harris评分进行功能评价。结果:收到完整调查问卷145份,所有患者获随访,时间1~5(3.23±1.22)年。145例患者分成两组,其中对手术疗效满意的118例,不满意的27例,手术总体满意率81.38%(118/145)。患者认为对生活影响比较大的前5个问题分别是术后髋部疼痛,肢体明显不等长、行走、上下楼梯、蹲起。两组术前Harris评分比较,差异无统计学意义(P>0.05),不满意组术后Harris评分较低。术后髋关节疼痛、肢体不等长是影响手术不满意的直接因素。结论:采用全髋关节置换术治疗CroweⅢ-Ⅳ型DDH患者手术难度大;术后髋关节疼痛(轻度以上),肢体不等长(>2 cm)是术后不满意的独立危险因素。展开更多
Ferrate（VI） was employed for the oxidation of cyanide （CN） and simultaneous removal of copper or nickel in the mixed/complexed systems of CN-Cu, CN-Ni, or CN-Cu-Ni. The degradation of CN （1.00 mmol/L） and remova...Ferrate（VI） was employed for the oxidation of cyanide （CN） and simultaneous removal of copper or nickel in the mixed/complexed systems of CN-Cu, CN-Ni, or CN-Cu-Ni. The degradation of CN （1.00 mmol/L） and removal of Cu （0.095 mmol/L） were investigated as a function of Fe（Ⅵ） doses from 0.3-2.00 mmol/L at pH 10.0. It was found that Fe（Ⅵ） could readily oxidize CN and the reduction of Fe（Ⅵ） into Fe（Ⅲ） might serve efficiently for the removal of free copper ions. The increase in Fe（Ⅵ） dose apparently favoured the CN oxidation as well as Cu removal. Moreover, the pH dependence study （pH 10.0-13.0） revealed that the oxidation of CN was almost unaffected in the studied pH range （10.0-13.0）, however, the maximum removal efficiency of Cu was obtained at pH 13.0. Similarly, treatment was carded out for CN-Ni system having the initial Ni concentration of 0.170 mmol/L and CN concentration of 1.00 mmol with Fe（Ⅵ） dose 2.00 mmol at various pH values （10.0-12.0）. Results showed a partial oxidation of CN and partial removal of Ni. It can be observed that Fe（Ⅵ） can partially degrade the CN-Ni complex in this pH range. Further, Fe（Ⅵ） was applied for the treatment of simulated industrial waste/effluent waters treatment containing CN, Cu, and Ni.展开更多
基金supported by the National Natural Science Foundation of China(No.41276067)the Air Liquide(China)R&D Co.,Ltd.(No.20200216).
文摘The synergetic effect and underlying mechanism of potassium ferrate(PF)with tea saponin(TS,a biosurfactant)in producing short chain fatty acids(SCFAs)from anaerobic fermentation of waste activated sludge(WAS)were explored in this work.Experimental results showed that 0.2 g PF(g TSS)^(-1)(total suspended solid)combined with 0.02 g TS(g TSS)^(-1) could further improve SCFAs’production,and the maximum SCFAs content reached 2008.7 mg COD L^(-1),which is 1.2 and 4.5 times higher than those with PF and TS individually added,respectively,and 5.3 times higher than that of blank WAS on Day 12.In the model substrates experiments,the degradation rates of bovine serum albumin and dextran with combination of PF and TS were 41.3%±0.1% and 48.5%±0.06%,respectively,on Day 3,which are lower than those in blank WAS(with degradation rates of 72.3%±0.5%and 90.3%±0.3%).It was revealed that the oxidative effect of PF and the solubilization of TS caused more organic matters to be dissolved out from WAS,providing a large number of biodegradable substances for subsequent SCFAs production.While WAS pretreated with the combination of PF and TS,the relative abundances of Firmicutes increased from 6.4%(blank)to 38.6%,and that of Proteobacteria decreased from 41.8%(blank)to 21.8%.The combination of PF and TS promoted the hydrolysis process of WAS by enriching Firmicutes,and then increased acetic acid production by inhibiting Proteobacteria that consumed SCFAs.Meanwhile,at the genus level,acidogenesis bacteria(e.g.,Proteiniclasticum and Petrimonas)were enriched whereas SCFAs consuming bacteria(e.g.,Dokdonella)were inhibited.
文摘目的:探讨全髋关节置换术的CroweⅢ-Ⅳ型发育性髋关节发育不良(developmental dysplasia of the hip,DDH)患者的满意度及造成不满意的相关因素。方法:回顾性分析2013年3月至2018年3月行全髋关节置换术的169例CroweⅢ-Ⅳ型DDH患者,通过微信进行调查问卷,调查患者对手术总体满意度、10项日常功能满意度和患者认为对自己日常生活影响比较大的前5个问题。手术前后采用髋关节Harris评分进行功能评价。结果:收到完整调查问卷145份,所有患者获随访,时间1~5(3.23±1.22)年。145例患者分成两组,其中对手术疗效满意的118例,不满意的27例,手术总体满意率81.38%(118/145)。患者认为对生活影响比较大的前5个问题分别是术后髋部疼痛,肢体明显不等长、行走、上下楼梯、蹲起。两组术前Harris评分比较,差异无统计学意义(P>0.05),不满意组术后Harris评分较低。术后髋关节疼痛、肢体不等长是影响手术不满意的直接因素。结论:采用全髋关节置换术治疗CroweⅢ-Ⅳ型DDH患者手术难度大;术后髋关节疼痛(轻度以上),肢体不等长(>2 cm)是术后不满意的独立危险因素。
基金supported by the grant of the Basic Research Program of the Korea Science & Engineering Foundation (No R01-2006-000-10284-0)
文摘Ferrate（VI） was employed for the oxidation of cyanide （CN） and simultaneous removal of copper or nickel in the mixed/complexed systems of CN-Cu, CN-Ni, or CN-Cu-Ni. The degradation of CN （1.00 mmol/L） and removal of Cu （0.095 mmol/L） were investigated as a function of Fe（Ⅵ） doses from 0.3-2.00 mmol/L at pH 10.0. It was found that Fe（Ⅵ） could readily oxidize CN and the reduction of Fe（Ⅵ） into Fe（Ⅲ） might serve efficiently for the removal of free copper ions. The increase in Fe（Ⅵ） dose apparently favoured the CN oxidation as well as Cu removal. Moreover, the pH dependence study （pH 10.0-13.0） revealed that the oxidation of CN was almost unaffected in the studied pH range （10.0-13.0）, however, the maximum removal efficiency of Cu was obtained at pH 13.0. Similarly, treatment was carded out for CN-Ni system having the initial Ni concentration of 0.170 mmol/L and CN concentration of 1.00 mmol with Fe（Ⅵ） dose 2.00 mmol at various pH values （10.0-12.0）. Results showed a partial oxidation of CN and partial removal of Ni. It can be observed that Fe（Ⅵ） can partially degrade the CN-Ni complex in this pH range. Further, Fe（Ⅵ） was applied for the treatment of simulated industrial waste/effluent waters treatment containing CN, Cu, and Ni.
