Environmental Screening Method for Dredging in Contaminated River

Manap, Norpadzlihatun; Voulvoulis, Nikolaos

doi:10.4028/www.scientific.net/amm.567.50

Cited by 9 publications

(6 citation statements)

References 15 publications

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“…As the demands for dredging project increases worldwide, it is necessary to handle dredging sustainably [1,2,3]. The meaning of sustainability fulfilled when there are implementations or adopts practices and policies that help to balance the environments, social and economic goals [4,5,6,7].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Trace Metal Contamination in Pahang River and Kelantan River, Malaysia

et al. 2019

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The primary objective of this study is to determine trace metal contamination in environmental samples obtained from Pahang River and Kelantan River, Malaysia which may help to identify the risk of sustainable dredging in these areas. This research also proceeds to compare the trace metal concentration with the National Water Quality Standards of Malaysia, Interim Canadian Sediment Quality Guidelines and Malaysian Food Act 1983 to determine its limits and risks. Samples of water, sediment, snails and fishes were collected and analyzed for As, Cu, Cd, Cr, Fe, Pb, Ni, Mn, and Hg by using atomic absorption spectrophotometer. It was found that the concentration of trace metals namely As, Cu, Cd, Cr, Pb, Ni, and Hg in river water, sediment, snail and fish samples in Pahang River were lower than the maximum allowable limits, except for Fe and Mn. In Kelantan River, the concentration of trace metals indicating that it is contaminated with Fe, Mn, Pb, Cr, Cu, Hg, and As as all trace metals exceeded the maximum allowable limits. Negative impacts may arise, and the river may contaminate more in future if there is no proper management to tackle this issue during execution of dredging activities.

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Section: Introductionmentioning

confidence: 99%

Analysis of Trace Metal Contamination in Pahang River and Kelantan River, Malaysia

et al. 2019

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“…Dredging can be defined as a process of extraction of sediments from the bottom of waterways in order to enhance the water flow or to make profitable use of those dredged sediments. Although dredging activity is needed for the development of a country, there are many environmental effects resulted both in the short term or long term [3,4].…”

Section: Introductionmentioning

confidence: 99%

Performance of Dredged Sediment as a Replacement for Fine Aggregates in Concrete Mixture: Case Study at Sungai Pekan, Pahang

et al. 2019

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Dredging is essential to maintain suitable depth for shipping by removing dredged sediments from sea and river banks. It is also an important process to supply construction material. In Pahang, increasing flood cases is occurring due to increased sea and river bed level. Thus, dredging is needed to be performed in this location. In addition, the rapid growth of the construction industry requires a sustainable approach. The reuse of dredged sediments as construction material could be a sustainable approach. Therefore, this research aims to study the engineering properties of dredged sediments and to compare the strength of concrete made from dredged sediments with conventional concrete. The samples for this research obtained from the location of this study at Sungai Pekan. Laboratory testing was performed to determine the engineering properties of dredged sediments and compressive strength of concrete produced from the dredged sediments. The highest average compressive strength of the concrete cube produced from Sample 1 is 9.2 N/mm² for seven days and 11.9 N/mm² for 28 days curing period. Comparatively, Sample 3 has the lowest average compressive strength that is 2.1 N/mm² for seven days and 2.7 N/mm² for 28 days curing period. The strength that is required to be achieved is 14 N/mm² for curing seven days and 20 N/mm² for curing period of 28 days. In conclusion, the concrete cubes made from dredged sediment taken at the sampling area are unable to produce concrete that satisfies the minimum strength for the C20 concrete mix. Therefore, it can be concluded that there is the minimal potential use of dredged sediments taken from the location of this study for the production of concrete in the construction industry.

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“…In developing countries, problems associated with contractor's performance are higher and even compounded as a result of inadequate resources and organizations to address them [3][4][5][6][7][8]. In Nigeria, the construction industry is vibrant and the largest in Africa but also been challenged to improve its performance [9][10].…”

Section: Introductionmentioning

confidence: 99%

Significant Ways to Improve the Performance of Medium and Large Local Contractors in the Jigawa State, Nigeria

Zainal

Hamza²,

Manap

et al. 2019

MATEC Web Conf.

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Contractors’ performance is an important criterion for the success of any construction project, as it is the contractor that converts designs into practical reality. While evidence suggests that there is much need for further improvement particularly in cost, time and quality, in Nigeria contractors’ performance is the subject that requires much research. This paper is to identify the significant ways to improve the performance of medium and large local contractors in the Jigawa state, Nigeria. Literature about contractors and their performance was reviewed to identify the ways believed to improve their performance in executing construction projects. Questionnaires distributed to 45 clients, 45 consultants, and 45 medium and large local contractors. The findings show that the respondents agree that the most significant ways to improve medium and large local contractor’s performance are transparent bidding process mechanism, proper selection of construction procurement system, quality control and standard assurance, local contractor patronage by the government and adopting information and communication technology (ICT) in design and construction. This paper offers better performance and expands the pool of knowledge to the Nigerian contractor regarding essential element that is needed to be observed in order to improve their performance.

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Environmental Screening Method for Dredging in Contaminated River

Cited by 9 publications

References 15 publications

Analysis of Trace Metal Contamination in Pahang River and Kelantan River, Malaysia

Analysis of Trace Metal Contamination in Pahang River and Kelantan River, Malaysia

Performance of Dredged Sediment as a Replacement for Fine Aggregates in Concrete Mixture: Case Study at Sungai Pekan, Pahang

Significant Ways to Improve the Performance of Medium and Large Local Contractors in the Jigawa State, Nigeria

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