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Volume 4, Issue 3, (2016)

Table of Contents

 

 

 

Experimental and Kinetic modeling of As (V) adsorption on Granular Ferric Hydroxide and Laterite

Yacouba Sanou, Samuel Pare, Nguyen Thi Thanh Phuong, Nguyen Van Phuoc, L. Yvonne Bonzi-Coulibaly

Volume 4 | Issue 3 | Pages: 62-70 | PDF | HTML

 

Abstract: This work aims to study the As (V) removal in aqueous solutions using Granular Ferric Hydroxide (GFH) and Natural Laterite at ambient temperature. Column experiments were conducted to investigate the As (V) removal mechanism and effects of parameters affecting the adsorption were studied to follow the adsorption kinetics. Maximum removal of arsenic (99.99% and 99.5%) was achieved at 15 min of contact time with an initial concentration of 20 mg/L using 10 g of GFH and laterite in 50 ml volume of solution, respectively. From the isotherm models study, i.e. Langmuir, Freundlich and Dubinin - Radushkevich, the adsorption process in our study followed best Freundlich isotherm. The study of isotherms showed that the adsorption was physical, spontaneous with GFH while endothermic using laterite, respectively. The kinetics study showed that the adsorption process fits with a pseudo-second order reaction model using both adsorbents. The adsorption column design was done using Logit method and the obtained values of adsorption rate coefficient (K) and adsorption capacity coefficient (N) were 3.2 10-4 L/(mg. min) and 8968.46 mg/L, respectively for GFH and 1.43 10-3 L/(mg. min), 977.19 mg/L using laterite. The fixed bed column studies showed that Granular Ferric Hydroxide and Laterite were efficient in small-scale for As (V) removal.

 

Keywords: Arsenic, Removal, Granular Ferric Hydroxide, Laterite, aqueous solutions.

 

 

 

Significant Factors Affecting Safety Program Performance of Construction Firms in Iran

Ali asghar Bavafa, Samineh Motamed, Abdul Kadir Marsono, Aziruddin Ressang, Aidin Nobahar Sadeghifam, Kambiz Ghafourian

Volume 4 | Issue 3 | Pages: 71-77 | PDF | HTML

 

Abstract: Globally, the construction industry is still considered as one of the most hazardous industries. According to the statistics proportion of accidents on construction sites are relatively high in Iran and after steel industry the highest accident rate is related to construction sector. Considering this situation, this paper aims to determine the important safety program factors, which influence the implementation of safety programs perceived by construction contractors. A list of 21 safety program sub factors categorized in 5 main clusters was determined to calculate the rank and importance of each factor. The date collection processes 61 questionnaires from grade one and 44 from grade two construction firms. It is found that the management commitment was ranked as the most important factor as compared to other main safety program factors. The most influential sub factors by all firms were found sufficient resource allocation to safety, high standard safety policies and personnel and management responsibilities definition regarding to project safety. On the other hand, Drug test, job hazard identifications and Workers behavior observation process are perceived as less important in influencing implementation of successful safety program in construction projects.

 

Keywords: Safety Program, Construction Site, Safety Factors, Iran

 

 

 

Solid Waste Management of Dhaka South City Corporation (DSCC)

Mahmuda Hasan, S. M. Saify Iqbal

Volume 4 | Issue 3 | Pages: 78-87 | PDF | HTML

 

Abstract: Dhaka, the capital city of Bangladesh is the only mega city of the country has a population nearly 15 million. About one third of the total urban population of the country lives in this city. Although Dhaka is the heart of the country, this city has been facing serious crisis environmentally. One of the most important environmental crises of this city is solid waste management. City authority has failed to manage the waste due to lack of manpower, necessary equipment and poor governance. This study has been undertaken to identify the methods used to collect waste. Ward 33 of Dhaka South City Corporation (DSCC) has been selected as a study site. Ward 33 is located in the older part of Dhaka city, characterized by high population density and high density of economic activities. Waste generation is the highest in this area in comparison with other areas. But waste collection service is not sufficient. On the other hand, some parts of the area do not get service properly. Some maps were prepared using Arc GIS 10.1 to identify the available dumping spots, van routes and also those areas where adequate service is not sufficient or missing.

 

Keywords: Environmental Crisis, Solid Waste Management, Waste Collection Service and Arc GIS 10.1

 

 

 

A Delphi Study to Identify Environmental Aspects Associated with Demolition Works

Fatemeh Nateghi, Arham Abdullah

Volume 4 | Issue 3 | Pages: 88-93 | PDF | HTML

 

Abstract: Construction and demolition projects, adversely impact on environment. Environmental laws, put the responsibility of controlling environmental aspects associated with construction and demolition projects on the shoulder of contractors. Obviously, those that break the law will be heavily fined. While complying with environmental laws is a challenging task for demolition practitioners, Environmental Management System (EMS), a self-regulatory framework aims to improve environmental performance of organizations and their complying with regulations. Demolition contractors are no exception, however, the first step in implementing EMS in demolition companies is, identifying environmental aspects. While very few research works cover demolition environmental aspects, this research aims to identify them with the aid of Delphi study.

 

Keywords: Environmental aspect evaluation, aspect identification, Delphi study, environmental management system

 

 

 

Evaluation of Activities of Transferases and Phosphatase in Plasma and Organs of Clarias gariepinus Exposed to Fluazifop-p-Butyl

Iniobong Reuben Inyang, Seiyefa Thomas and Sylvester Chibueze Izah

Volume 4 | Issue 3 | Pages: 94-97 | PDF | HTML

 

Abstract: The aim of this study was to evaluate the activities of transferases and phosphotase in plasma, liver and kidney of Clarias gariepinus. This study was carried out in the department of fisheries and animal science, Niger Delta University, Wilberforce Island, Bayelsa State, between September, 2014 and April 2015. Adult Clarias gariepinus were exposed in four replicates to varying concentrations of fluazifop-p-butyl (ranging from 0.01 -0.03ppm) in a 30 day semi static bioassay. Samples were obtained from the liver, kidney and plasma. A statistically significant increase (p<0.05) was recorded in the plasma. Liver alkaline amino transferase (ALT) and Alkaline phosphatase (ALP) unveiled a significance decrease, while liver aspartate amino transferase (AST) showed a clear progressive increase compared to the control. Kidney enzyme values were significant. A progressive decrease in value were recorded (not in a dose dependent pattern). This toxicant could be toxic at high concentration. These parameters could serve as useful biomarkers of sublethal effect of fluazifop-p-butyl in non-target organism in the aquatic environment.

 

Keywords: Fluazifop-p-butyl, Clarias gariepinus, Plasma enzymes, Fish bioassay.

 

 

 

 

 

 

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