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