In this work,the effects of pH value of waste water and initial concentration of phosphorus on dephosphorization materials were investigated.The materials were prepared by shaping,sintering and hydrothermal reshaping ...In this work,the effects of pH value of waste water and initial concentration of phosphorus on dephosphorization materials were investigated.The materials were prepared by shaping,sintering and hydrothermal reshaping oyster shell and silica micro-powder.Different concentrations of phosphorus-contained waste water were simulated with potassium dihydrogen phosphate solution,the effect of dephosphorization was tested with phosphomolybdenum blue spectrophotometer method,and the crystal phase and microstructure of materials were characterized by XRD and SEM methods. It was indicated that dephosphorization was completed in 6 h when the initial phosphorus concentration in waste water was lower than 15 mg/L, and the dephosphorization time prolonged as the increase of phosphorus concentration. It was observed that the pH value of waste water influenced dephosphorization significantly, and neutral subalkalic environment favored dephosphorization. When the pH value was 11, the efficiency of dephosphozation was the greatest. For waste water with an initial concentration of 20 mg/L, the dephosphozation rate is close to 100% in8 h.展开更多
Micro-scale Al-Zn-Mg/Fe composite powders (MAF) with high reactivity and good storage properties were prepared by reducing iron onto the surface of Al-Zn-Mg alloy powders. Experimental results show that MAF as advance...Micro-scale Al-Zn-Mg/Fe composite powders (MAF) with high reactivity and good storage properties were prepared by reducing iron onto the surface of Al-Zn-Mg alloy powders. Experimental results show that MAF as advanced zero-valent iron are highly effective for degradation of chlorinated organic compounds. The efficiency of degradation for carbon tetrachloride and perchloroethylene is higher than 99% within a period of 2 h. The efficiency of degradation for trichloroethylene by MAF after storing for one month is equivalent to that by freshly prepared nano-size zero-valent iron particles.展开更多
[Objective] The study aimed to discover the effects of powder active carbon( PAC) /flotation /micro-flocculation /ultrafiltration combined process on the treatment of reservoir water. [Method]Taken the water from a ...[Objective] The study aimed to discover the effects of powder active carbon( PAC) /flotation /micro-flocculation /ultrafiltration combined process on the treatment of reservoir water. [Method]Taken the water from a mountainous reservoir for the initial samples,the parameters such as turbidity,COD Mn,chlorophyll-a and methylisobormeol( MIB) of water samples were monitored before and after treated with combined processes of micro-flocculation /ultrafiltration, flotation /micro-flocculation /ultrafiltration, PAC /flotation /micro-flocculation /ultrafiltration. [Result] The results showed that the removal rates of turbidity of water samples by the above three processes were 97. 5%,98. 0% and 98. 6%,respectively. The removal rates of COD Mn were 30. 9%,35. 0% and 52. 0%. The removal rates of chlorophyll-a were 80. 6%,91. 0% and 99. 0%. The removal rates of MIB were 17. 0%,34. 2% and 97. 0%. [Conclusion]The PAC /flotation /micro-flocculation ultrafiltration combined process can be flexibly combined based on the characteristics of algae and odor in water,and is suitable for water plant construction or reconstruction.展开更多
The extrusion of Al-Si alloy powders with different particle sizes allows manufacture of different products with unique microstructures and therefore with unique mechanical properties. The effects of powder size on th...The extrusion of Al-Si alloy powders with different particle sizes allows manufacture of different products with unique microstructures and therefore with unique mechanical properties. The effects of powder size on the extrusion behavior and process defect of Al-18%Si alloy were studied by means of microscopy (optical, scanning electron) and density determination. The main objective of the work is to demonstrate the influence of the powder material characteristics on final density and quality of bar. The results show that the bigger the powder particles, the better the performance of cold compacting. The surface of alloy bar extruded from big particles has good quality without cracking. While the smaller the powder particles, the higher the density and the better the microstructure and mechanical properties. For practice application, the mixed powders are better than single powder.展开更多
OBJECTIVE: To observe the effects of Zhenren Yangzang Decoction combined with modified Shenling Baizhu Powder on the immune function and intestinal microecology of diarrhea patients with deficiency and cold syndrome. ...OBJECTIVE: To observe the effects of Zhenren Yangzang Decoction combined with modified Shenling Baizhu Powder on the immune function and intestinal microecology of diarrhea patients with deficiency and cold syndrome. METHODS: A total of 60 diarrhea patients with deficiency and cold syndrome were randomly divided into observation group and control group, with 30 cases in each group. The control group was treated with conventional western medicine. The observation group was given the treatment of Zhenren Yangzang Decoction combined with modified Shenling Baizhu Powder on the basis of the same treatment for 4 weeks. The clinical symptoms, fecal flora and immunoglobulin content of the 2 groups were observed and the clinical efficacy was evaluated. RESULTS: After treatment, the symptoms scores of fecal diarrhea, aversion to cold, cold limbs, loss of appetite, cold and painful waist and knee, abdominal fullness, abdominal distension and abdominal pain, and intestinal bacilli contents were significantly decreased(P < 0.05). The contents of lactobacillus, bifidus bacilli, IgG, IgM and IgA were significantly increased(P < 0.05), and the improvement of the above indexes in the observation group was significantly better than that in the control group(P < 0.05). The total effective rate after treatment in the observation group was 93.3%, which was significantly higher than 73.3% of the control group(P < 0.05). CONCLUSION: The treatment of diarrhea patients with deficiency and cold syndrome with Zhenren Yangzang Decoction and modified Shenling Baizhu Powder can effectively improve the intestinal micro-ecological environment, improve the immune function of patients and promote the rapid recovery of patients.展开更多
基金Supported by Fujian Science and Technology Administration (2004I003 and 20060037)
文摘In this work,the effects of pH value of waste water and initial concentration of phosphorus on dephosphorization materials were investigated.The materials were prepared by shaping,sintering and hydrothermal reshaping oyster shell and silica micro-powder.Different concentrations of phosphorus-contained waste water were simulated with potassium dihydrogen phosphate solution,the effect of dephosphorization was tested with phosphomolybdenum blue spectrophotometer method,and the crystal phase and microstructure of materials were characterized by XRD and SEM methods. It was indicated that dephosphorization was completed in 6 h when the initial phosphorus concentration in waste water was lower than 15 mg/L, and the dephosphorization time prolonged as the increase of phosphorus concentration. It was observed that the pH value of waste water influenced dephosphorization significantly, and neutral subalkalic environment favored dephosphorization. When the pH value was 11, the efficiency of dephosphozation was the greatest. For waste water with an initial concentration of 20 mg/L, the dephosphozation rate is close to 100% in8 h.
文摘Micro-scale Al-Zn-Mg/Fe composite powders (MAF) with high reactivity and good storage properties were prepared by reducing iron onto the surface of Al-Zn-Mg alloy powders. Experimental results show that MAF as advanced zero-valent iron are highly effective for degradation of chlorinated organic compounds. The efficiency of degradation for carbon tetrachloride and perchloroethylene is higher than 99% within a period of 2 h. The efficiency of degradation for trichloroethylene by MAF after storing for one month is equivalent to that by freshly prepared nano-size zero-valent iron particles.
基金Supported by Water Pollution Control and Treatment National Science and Technology Major Project(2012ZX07404-003)Major Projects of Science and Technology of Jinan City(201201133)
文摘[Objective] The study aimed to discover the effects of powder active carbon( PAC) /flotation /micro-flocculation /ultrafiltration combined process on the treatment of reservoir water. [Method]Taken the water from a mountainous reservoir for the initial samples,the parameters such as turbidity,COD Mn,chlorophyll-a and methylisobormeol( MIB) of water samples were monitored before and after treated with combined processes of micro-flocculation /ultrafiltration, flotation /micro-flocculation /ultrafiltration, PAC /flotation /micro-flocculation /ultrafiltration. [Result] The results showed that the removal rates of turbidity of water samples by the above three processes were 97. 5%,98. 0% and 98. 6%,respectively. The removal rates of COD Mn were 30. 9%,35. 0% and 52. 0%. The removal rates of chlorophyll-a were 80. 6%,91. 0% and 99. 0%. The removal rates of MIB were 17. 0%,34. 2% and 97. 0%. [Conclusion]The PAC /flotation /micro-flocculation ultrafiltration combined process can be flexibly combined based on the characteristics of algae and odor in water,and is suitable for water plant construction or reconstruction.
基金Project(514120203) supported by the Advanced Investigation Foundation of Weapon Equipment
文摘The extrusion of Al-Si alloy powders with different particle sizes allows manufacture of different products with unique microstructures and therefore with unique mechanical properties. The effects of powder size on the extrusion behavior and process defect of Al-18%Si alloy were studied by means of microscopy (optical, scanning electron) and density determination. The main objective of the work is to demonstrate the influence of the powder material characteristics on final density and quality of bar. The results show that the bigger the powder particles, the better the performance of cold compacting. The surface of alloy bar extruded from big particles has good quality without cracking. While the smaller the powder particles, the higher the density and the better the microstructure and mechanical properties. For practice application, the mixed powders are better than single powder.
文摘OBJECTIVE: To observe the effects of Zhenren Yangzang Decoction combined with modified Shenling Baizhu Powder on the immune function and intestinal microecology of diarrhea patients with deficiency and cold syndrome. METHODS: A total of 60 diarrhea patients with deficiency and cold syndrome were randomly divided into observation group and control group, with 30 cases in each group. The control group was treated with conventional western medicine. The observation group was given the treatment of Zhenren Yangzang Decoction combined with modified Shenling Baizhu Powder on the basis of the same treatment for 4 weeks. The clinical symptoms, fecal flora and immunoglobulin content of the 2 groups were observed and the clinical efficacy was evaluated. RESULTS: After treatment, the symptoms scores of fecal diarrhea, aversion to cold, cold limbs, loss of appetite, cold and painful waist and knee, abdominal fullness, abdominal distension and abdominal pain, and intestinal bacilli contents were significantly decreased(P < 0.05). The contents of lactobacillus, bifidus bacilli, IgG, IgM and IgA were significantly increased(P < 0.05), and the improvement of the above indexes in the observation group was significantly better than that in the control group(P < 0.05). The total effective rate after treatment in the observation group was 93.3%, which was significantly higher than 73.3% of the control group(P < 0.05). CONCLUSION: The treatment of diarrhea patients with deficiency and cold syndrome with Zhenren Yangzang Decoction and modified Shenling Baizhu Powder can effectively improve the intestinal micro-ecological environment, improve the immune function of patients and promote the rapid recovery of patients.