Quantitative evaluation and application of Cryptosporidium parvum inactivation with ozone treatment

2007 ◽  
Vol 55 (1-2) ◽  
pp. 241-250 ◽  
Author(s):  
M. Cho ◽  
J. Yoon
Keyword(s):  
Quantitative Evaluation ◽  
Cryptosporidium Parvum ◽  
Contact Time ◽  
Treatment System ◽  
Ozone Treatment ◽  
Quantitative Methodology ◽  
Water Parameters ◽  
Factors Affecting ◽  
Unique Line ◽  
Ozone Disinfection

Despite a wealth of studies concerning the factors affecting the inactivation of Cryptosporidium parvum on ozone disinfection, practical approaches for predicting the inactivation level on ozone treatment system and determining the required ozone dose or contact time to achieve the required inactivation level remain unclear. When modified version of the “Delayed Chick–Watson model” was applied, the results show that Cryptosporidium parvum inactivation was well fitted with one unique line as “C̄Tlag” and “inactivation slope” for several water parameters and water types. Thus, this study suggests quantitative methodology for predicting the Cryptosporidium parvum inactivation level with observation for the contact time of ozone and Cryptosporidium parvum and ozone residual.

Organizational dynamics: exploring the factors affecting knowledge sharing behavior

Kybernetes ◽  
2019 ◽  
Vol 49 (1) ◽  
pp. 165-181 ◽  
Author(s):  
Nóra Obermayer ◽  
Viktoria Erika Toth
Keyword(s):  
Knowledge Sharing ◽  
Organizational Factors ◽  
Organizational Characteristics ◽  
Organizational Dynamics ◽  
Quantitative Methodology ◽  
Data Set ◽  
Content Type ◽  
Factors Affecting ◽  
Effective Manner ◽  
The Individual

Purpose The purpose of this study is to identify the individual and organizational factors that influence knowledge sharing (KS) behavior within Hungarian organizations. Design/methodology/approach The data were obtained from 238 completed questionnaires collected via the LimeSurvey system. The analysis is based on applied quantitative methodology, both descriptive and inferential statistics were used. The research investigated the relationships between individual and organizational characteristics and the KS behavior at individual and global levels. Findings Among individual factors, significant relationships have been identified regarding the generation and position of individuals, and KS behavior, while gender and education do not seem to play a significant role. With respect to organizational factors, the size of the organization and the tenure of individuals are found to be significant. Research limitations/implications The results of the analysis are limited because the data set was not large enough to investigate inter- and intra-industry variability. Practical implications The outcome of this research can support the design of managerial and organizational processes and incentives that will potentially facilitate KS in a more efficient and effective manner. Such improved KS is likely to improve the overall performance of knowledge-intensive organizations. Originality/value The original value of this research is that individual and organizational characteristics have been identified that influence KS behavior. The study focuses on a single country, Hungary, and provides relevant insight into the organizational dynamics of a specific national context.

Occurrence and factors affecting the formation of trihalomethanes, haloacetonitriles and halonitromethanes in outdoor swimming pools treated with trichloroisocyanuric acid

2018 ◽  
Vol 4 (2) ◽  
pp. 218-225 ◽  
Author(s):  
Fang Yang ◽  
Zhaoguang Yang ◽  
Haipu Li ◽  
Fangfang Jia ◽  
Ying Yang
Keyword(s):  
Health Risks ◽  
Swimming Pools ◽  
Water Parameters ◽  
Factors Affecting ◽  
Influence Of Water ◽  
Trichloroisocyanuric Acid

Occurrence and health risks of the title DBPs in outdoor swimming pools were identified and the influence of water parameters and pool management on their formation were discussed.

Factors affecting trihalomethane formation and speciation during chlorination of reclaimed water

2015 ◽  
Vol 72 (4) ◽  
pp. 616-622 ◽  
Author(s):  
Defang Ma ◽  
Baoyu Gao ◽  
Yan Wang ◽  
Qinyan Yue ◽  
Qian Li
Keyword(s):  
Wastewater Treatment ◽  
Activated Carbon ◽  
Correlation Coefficient ◽  
Contact Time ◽  
Membrane Bioreactor ◽  
Municipal Wastewater ◽  
Reclaimed Water ◽  
Neutral Condition ◽  
Municipal Wastewater Treatment ◽  
Factors Affecting

A hybrid process with membrane bioreactor (MBR) and powdered activated carbon (PAC), PAC/MBR, was used for real municipal wastewater treatment and reuse. The roles of chlorine dose, contact time, pH and bromide in trihalomethane (THM) formation and speciation during chlorination of the reclaimed water were investigated. Total trihalomethane (TTHM) yield exponentially increased to maximum with increasing chlorine dose (correlation coefficient R2 = 0.98). Prolonging substrate chlorine contact time significantly promoted TTHM formation. Less than 40% of THMs formed in the first 24 h, indicating that the PAC/MBR effluent organic matters were mostly composed of slow-reacting precursors. Increasing pH and bromide concentration facilitated THM formation. Higher chlorine dose and contact time enhanced chloro-THM formation. The bromo-THM formation was favored at near neutral condition. Despite the variation of chlorine dose, contact time and pH, the yield of THM species in order was usually CHCl3 > CHBrCl2 > CHBr2Cl > CHBr3. However, THM speciation shifted from chlorinated species to brominated species with increasing bromide concentration.

Optimization of the Adsorption Process of Bezaktiv Turquoise Blue «VG» Textile Dye onto Diatomite Using the Taguchi Method

2018 ◽  
Vol 762 ◽  
pp. 81-86 ◽  
Author(s):  
Hakim Aguedal ◽  
Abdelkader Iddou ◽  
Janis Locs
Keyword(s):  
Taguchi Method ◽  
Adsorption Capacity ◽  
Contact Time ◽  
Adsorption Process ◽  
Removal Rate ◽  
Textile Dye ◽  
Adsorption Parameters ◽  
Thermal Regeneration ◽  
Factors Affecting ◽  
Relevant Factors

A design of experiments based on the Taguchi method was used to evaluate the main parameters affecting the removal of textile dyes from aqueous solution. By using the adsorption capacity of textile dye as target response, several experiments were carried out using L27 orthogonal array, and the higher-the-better as quality characteristics was applied. The controlling factors, including initial dye concentration, contact time and pH of solution were assessed. Analysis of variance (ANOVA) was used to determine the effects of each factor on the adsorption capacity. The optimum adsorption conditions giving higher adsorption capacity were selected as initial dye concentration of 500 mg.L-1, contact time of 180 min and pH of solution of 2. The analysis results revealed that the most relevant factors affecting the adsorption process of textile dye are the initial dye concentration and pH of solution. After 3 cycles of thermal regeneration, the diatomite behavior did not change and more than 60 % of dye was eliminated from solution after regeneration at 600°C. From the obtained results, the Taguchi method was very successful to optimize of the adsorption parameters for maximum removal rate, and gives more credibility for industrial application.

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