1,720,961 research outputs found
The Fate Of Heavy Metals In A Stabilization Pond System Treating Household Wastewater / Lim Boon Tik
Full text linkThe waste stabilization pond system in Taman Kota Permai, Seberang Perai Tengah, Penang consisting
of two facultative ponds in parallel and a maturation pond connected to each of them in series is
being used to treat domestic sewage. This study investigates the removal efficiency of trace metals
(Zn, Cu, Pb, and Cd) and their speciation in this stabilization pond system.
The percentage of the removal of the dissolved heavy metal concentrations throughout the treatment
path from the raw sewage to the final effluent was for zinc (79%), copper (63%), lead (73%) and
cadmium (66%). The removal efficiency of these heavy metals was found to be most obvious in the
facultative ponds. The mean percentages of the removal of these heavy metal concentrations in these
ponds were zinc (65%), copper (50%), lead (64%) and cadmium (49%).
Trace metals species are differentiated utilizing anodic stripping voltammetry (ASV) and their labilities
towards ammonium form chelex resin in successive column and batch procedures. Species are
classified as being ASV-labile, moderately labile, slowly labile and inert. It was observed that there
was some reduction in the percentage of ASV-labile species and moderately labile species along the
treatment path. However, there was an increase in the percentage of the other two species. This
phenomenon could be due to the formation of complexes with organic matters
A comparative study between Cu and Pb in the speciation study of heavy metals in a stabilization pond treating household wastewater / Lim Boon Tik
Full text linkThe waste stabilization pond system in Taman Kota Permai, Seberang Perai Tengah, Penang consisting of two facultative ponds in parallel and a maturation pond connected to each of them in series is being used to
treat domestic sewage. This study investigates the removal efficiency of trace metals (Cu and Pb) and their speciation in the particulate of this stabilization pond system. The percentages of removal efficiencies of trace particulate heavy metals along the treatment path were 62% for Cu and 65% for Pb. The speciation of particulate heavy metals was carried out according to the procedure which partitions particulate trace metals into five fractions, namely, (a) exchangeable, (b) bound to carbonates, (c) bound to Fe-Mn
oxides, (d) bound to organic matter and (e) residual. The results showed that Pb appeared mainly in the bound to Fe-Mn oxides fraction. The percentage distribution of Pb in this fraction in the particulates of the final effluents was 69 %. However, Cu was mainly found in the bound to organic matter fraction and its percentage distribution was 64%. The results also shows that Pb is more mobile than Cu. The percentages associated with mobile phase is 80% for Pb while the mobile phase for Cu is 34% only
Design of road humps in residential area / Muhammad Akram Adrian, Teoh Sian Hoon and Lim Boon Tik
Full text linkSpeed hump is one of the traffic calming devices that has been installed in residential area in Malaysia. This study was to find a better design of speed hump in reducing speed of vehicles. Data were collected using Speed Radar Meter Detector. Two sets of data were collected. They were speed before reaching the hump (at 30m before the device, this is due to safe stopping sight distance) and
speed over the hump for both motorcycles and cars. Data were collected in one hour or at least 50 vehicles at three locations. The effectiveness of the humps is measured by comparing the reduction in speed at the hump. The effectiveness of the speed hump also influenced by other parameters such as height and width of it
The fate of heavy metals in a stabilization pond system treating household wastewater
No full textThe waste stabilization pond system in Taman Kota Permai, Seberang Perai Tengah, Penang consist-ing of two facultative ponds in parallel and a maturation pond connected to each of them in series is being used to treat domestic sewage. This study investigates the removal efficiency of trace metals (Zn, Cu, Pb, and Cd ) and their speciation in this stabilization pond system. The percentage of the removal of the dissolved heavy metal concentrations throughout the treatment path from the raw sewage to the final effluent was for zinc (79%), copper (63%), lead (73%) and cadmium (66%). The removal efficiency of these heavy metals was found to be most obvious in the facultative ponds. The mean percentages of the removal of these heavy metal concentrations in these ponds were zinc (65%), copper (50%), lead (64%) and cadmium (49%). Trace metals species are differentiated utilizing anodic stripping voltammetry (ASV) and their labili-ties towards ammonium form chelex resin in successive column and batch procedures. Species are classified as being ASV-labile, moderately labile, slowly labile and inert. It was observed that there was some reduction in the percentage of ASV-labile species and moderately labile species along the treatment path. However, there was an increase in the percentage of the other two species. This phenomenon could be due to the formation of complexes with organic matters
To determine and calculate the concentration of heavy metals in shredded tire / Lim Boon Tik ... [et. al].
Full text linkShredded scrap tire provide a valuable source of embankment material for highway construction. However, one of the major concern regarding the usage of shredded tire is the potential for heavy metals to leach out from the material and contaminate the surface and groundwater. The objective of this study is to investigate the leachate characteristic of heavy metals in shredded tire. The metals studied in this study are Aluminium, Cadmium, Copper, Iron, Cobalt, Manganese and Zinc. These metals were determined by Toxicity Characteristic Leaching Procedure (TCLP) test, which is the mandatory test in the US for assessing whether or not a waste should be considered hazardous. At pH 5.0, the concentration mg/L) for Al, Cd, Co, Cr, Cu, Fe, Mn, Pb and Zn were found to be 0.816, 0.0005, 0.10, ND, 0.30, 78.57, 1.11, ND and 0.08 respectively. The concentration of all the heavy metals, except for iron and Mn, does not exceed the MCL by set EPA. Similarly, when compared to The Parameter Limits (standard B) under Environmental Quality Act, 1974, it is found that iron and Mn exceeded the limit under Environmental Quality Act, 1974. The concentration of iron 263 times higher than the maximum concentration levels set by EPA. However, iron does not exceed the parameter limit set by Minnesota Pollution Control Agency.
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A comparative study between Cu and Pb in the speciation study of heavy metals in a stabilization pond treating household wastewater
No full textThe waste stabilization pond system in Taman Kota Permai, Seberang Perai Tengah, Penang consisting of two facultative ponds in parallel and a maturation pond connected to each of them in series is being used to treat domestic sewage. This study investigates the removal efficiency of trace metals (Cu and Pb) and their speciation in the particulate of this stabilization pond system. The percentages of removal efficiencies of trace particulate heavy metals along the treatment path were 62% for Cu and 65% for Pb. The speciation of particulate heavy metals was carried out according to the procedure which partitions particulate trace metals into five fractions, namely, (a) exchangeable, (b) bound to carbonates, (c) bound to Fe-Mn oxides, (d) bound to organic matter and (e) residual. The results showed that Pb appeared mainly in the bound to Fe-Mn oxides fraction. The percentage distribution of Pb in this fraction in the particulates of the final effluents was 69 %. However, Cu was mainly found in the bound to organic matter fraction and its percentage distribution was 64%. The results also shows that Pb is more mobile than Cu. The percentages associated with mobile phase is 80% for Pb while the mobile phase for Cu is 34% only
Pengolahan Dan Penspesiesan Logam Berat Di Dalam Kolam Penstabilan Air Buangan Domestik [TD758.5.H43 L732 2002 f rb].
Full text linkSistem kolam penstabilan yang dikaji bertempat di Taman Kota Permai, Seberang Perai Tengah, Pulau Pinang
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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