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Volume 5, Issue 2, (2017)

Table of Contents

 

 

 

 

 

Influence of the Solution pH on Adsorption and Rejection of Race Organic Contaminants from Wastewater by a Nanofiltration Membrane

Hai Quang Dang, William E. Price

Volume 5  |  Issue 2 |  Pages: 65-71 | PDF | HTML

 

Abstract: This study investigated the influence of the feed solution pH on the adsorption and rejection of the trace organic contaminants by a loose nanofiltration membrane NF270. The compounds examined were tested using a cross flow NF/RO cell membrane filtration system for 24 hours under three different pH conditions (4.7, 7 and 11). The feed solution pH effected considerably on the hydrophobicity, charge and the adsorption of dissociable organic compounds and therefore it affected the rejection efficiency of these compounds. Experimental results showed that most of the hydrophobic trace organic contaminants significantly adsorbed onto the membrane, whereas hydrophilic trace organic contaminants less adsorbed compared with hydrophobic compounds at the experimental conditions. Results reported in this study also indicated that the hydrophilic compounds exhibited better rejection values compared to hydrophobic compounds. The rejection efficiency of all these compounds was different depending on the feed solution pH as well as the physicochemical properties of each compound.

 

Keywords: Nanofiltration (NF), Trace organic contaminants (TrOCs), Adsorption, Rejection efficiency

 

 

Toxicity of Detergent Containing Linear Alkyl benzene Sulphonate on Some Commonly Cultured Fish Species in the Niger Delta

Volume 5  |  Issue 2 |  Pages: 72-77 | PDF | HTML 

Enemuadia Oyoroko* and Emmanuel N. Ogamba

 

Abstract: This study evaluated the toxicity of detergent containing linear alkyl benzene sulphonate against some commonly reared freshwater fish (Clarias gariepinus, Heterobranchus bidorsalis and Heteroclarias) in the Niger Delta. The fish species were allowed to acclimatize in separate aquaria for 3 days in the laboratory. The range finding test was carried out at three different concentrations. From the range finding test result, the main experimental set-up was carried out at 0, 50, 100, 150, 200 and 250ppm of the detergent in a renewed bioassay. Results showed that the mortality rate increased as the exposure time and concentration of the toxicants increased. The LC50 values for Heterobranchus bidorsalis, Clarias gariepinus and Heteroclarias were 91.67ppm, 183.3ppm and 41.67ppm. The apparent differences among the LC50 values of the various species could be associated to age, size and species type’s composition. Due to the toxicity associated to the detergent, caution should be exercised in the use and discharge of effluents of detergents containing linear alkyl benzene sulphonate into the aquatic ecosystem.

 

Keywords: Detergent, fisheries, Toxicant, Toxicity

 

 

Knowledge Sharing Enhances Knowledge Management Environment and Efficiency

Volume 5  |  Issue 2 |  Pages: 78-82 | PDF | HTML 

Haradhan Kumar Mohajan, Md. Shahidul Islam, Falguni Shome

 

Abstract: At present the organizations of the world are moving towards an efficient knowledge based development environment. Knowledge sharing is an important tool that turns individual knowledge into group organizational knowledge. Knowledge sharing among employees is a procedure which passes skills and qualifications from one person to another to solve problems, develop new ideas, or implement policies or procedures. Future success of an organization depends on effective knowledge sharing. In this study a survey is conducted among 163 employees in different organizations on knowledge sharing. Data are collected on questionnaire survey on ‘Likert five point scale’ to measure the observed variables. Factor analysis and structure equation model are developed from collected data by SPSS 20 and AMOS 21. Research shows that knowledge sharing increases the knowledge management practice environment and efficiency of the organization. An attempt has been taken here to show that knowledge sharing increases knowledge management practice.

Keywords: Knowledge sharing, knowledge management, organization.

 

 

Examining the toxicity of Cadmium chloride in common Carp (Cyprinus carpio) and Goldfish (Carassius auratus)

Volume 5  |  Issue 2 |  Pages: 83-86 | PDF | HTML 

Ahmad Mohamadi Yalsuyi, Aliakbar Hedayati, Mohammad Forouhar Vajargah and Hamed Mousavi Sabet

 

Abstract: Heavy metals are one of the factors threatening food security and the ecosystem health. The 96h LC50 test is a method to find amount of resistance and survival of different species in confronting with different concentrations of pesticides and other risk factors. The aim of the present study was to evaluate the sensitivity of the two species of freshwater fish (common carp (Cyprinus carpio) and Goldfish (Carassius auratus) than heavy metal cadmium. For this purpose, the fish were in a range of different concentrations of Cadmium (0, 0.2, 1, 2, 6, 10 and 15 ml/L). After compatibility time, 147 fish were selected randomly and were divided into 7 treatments (0, 0.2, 1, 2, 6, 10 and 15 ml/L Cadmium chloride) and 3 repetitions (number of fish in each treatment was 21). Data analysis revealed that common carp was more sensitive to Cadmium toxicity and 96h LC50 was lower 8.845 ml/L. The 96h LC50 of Cadmium for Gold Fish was 9.202 ml/L. The results showed that cadmium chloride was highly toxic for freshwater fishes; however, its toxicity was different for various species (p˂0.05).

 

Keywords: Acute toxicity, Heavy metals, Cadmium chloride, freshwater fishes, LC50 96h.

 

 

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