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Phosphorus limitation on bacterial regrowth in drinking water

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Journal of Environmental Sciences 2003年第6期15卷 773-778页

作者： SANGJun-qiang ZHANGXi-hui YUGuo-zhong WANGZhan-sheng ResearchCenterforEnvironmentalEngineeringandManagement ShenzhenGraduateSchoolTsinghuaUniversityShenzhen518057China. DepartmentofEnvironmentalScienceandEngineering TsinghuaUniversityBeijing100084China

Assimilable organic carbon(AOC) test and bacterial regrowth potential(BRP) analysis were used to investigate the effect of phosphorus on bacterial regrowth in the drinking water that was made from some raw water taken from a reservoir located in northern China. It was shown that AOC of the drinking water samples increased by 43.9%—59.6% and BRP increased by 100%—235% when 50 μg/L PO 3- 4-P(as NaH 2PO 4) was added alone to the drinking water samples. This result was clear evidence of phosphorus limitation on bacteria regrowth in the drinking water. This investigation indicated the importance of phosphorus in ensuring biological stability of drinking water and offered a novel possible option to restrict microbial regrowth in drinking water distribution system by applying appropriate technologies to remove phosphorus efficiently from drinking water in China.

关键词： drinking water bacterial regrowth phosphorus AOC biological stability

Using selenium-conjugated polyethylene glycol to enhance the stability of gold nanoparticles in biologically relevant samples

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Science China Chemistry 2019年第2期62卷 280-286页

作者： Yang Xue Bo Dong Xuehui Liu Fengchao Wang Jie Yang Dingbin Liu State Key Laboratory of Medicinal Chemical Biology Research Center for Analytical Sciences and Tianjin Key Laboratory of Molecular Recognition and Biosensing College of Chemistry Nankai University Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)

Using stabilizing agents to maintain the physicochemical properties of colloids in complex environments is crucial for their realworld applications. In this article, we describe how selenium-(Se-) terminated polyethylene glycol(PEG) can serve as a highaffinity stabilizing agent for gold nanoparticles(AuNPs). Compared to Au NPs modified with standard thiolated PEG(S-PEG),Se-PEG-coated Au NPs are much more stable under extreme conditions such as high/low pH, high salt content, and high temperatures. We demonstrate that the Se anchor can prevent the dissociation of PEG ligands from Au NP surfaces in living cells,where a higher concentration of biothiols is usually present. These results indicate that Se-PEG is an excellent stabilizing agent that may facilitate further studies on metal NPs for various complex and physiological systems.

关键词： selenium polyethylene glycol gold nanoparticles biological stability

Improving Removal Efficiency of Organic Matters by Adding Phosphorus in Drinking Water Biofiltration Treatment

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Biomedical and Environmental Sciences 2003年第1期16卷 29-39页

作者： XIN YU, XIAO-JIAN ZHANG, AND ZHAN-SHENG WANGDepartment of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China Department of Environmental Science and Engineering Tsinghua University 北京 100084

Objective To investigate phosphorus limitation and its effect on the removal efficiency of organic matters in drinking water biological treatment. Methods Bacterial growth potential (BGP) method and a pair of parallel pilot-scale biofilters were used for the two objectives, respectively. Results The addition of phosphorus could substantially increase the BGPs of the water samples and the effect was stronger than that of the addition of carbon. When nothing was added into the influents, both CODMn removals of the parallel biofilters (BF1 and BF2) were about 15%. When phosphate was added into its influent, BF1 performed a CODMn removal, 6.02 percentage points higher than the control filter (BF2) and its effluent had a higher biological stability. When the addition dose was biological treatment.

关键词： Drinking water Biofiltration Phosphorus Limiting nutrient Organic matters biological stability