Development of an environmental management framework for sustainable reuse of Malaysian dredged marine sediments
Dredged marine sediments (DMS), product of dredging activities, is classified as a waste and usually disposed off at sea. However, certain DMS is contaminated and sea disposal can significantly affect water quality and marine ecosystem. This can be mitigated and controlled by appropriate DMS managem...
Saved in:
| Main Author: | |
|---|---|
| Format: | Thesis |
| Published: |
2016
|
| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/8866/ http://eprints.uthm.edu.my/8866/1/ZARINA_SHAHRI.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Dredged marine sediments (DMS), product of dredging activities, is classified as a
waste and usually disposed off at sea. However, certain DMS is contaminated and
sea disposal can significantly affect water quality and marine ecosystem. This can be
mitigated and controlled by appropriate DMS management. The aim of this study is
to develop an environmental management framework for sustainable reuse of
Malaysian DMS. The DMS was retrieved from four dredging sites: Lumut, Melaka,
Tok Bali and Pasir Gudang. There are six components in this framework: physical
properties, chemical properties, biological properties, treatment, beneficial uses and
disposal. The framework begins with DMS physical properties. Assessment DMS
with > 50 % of particles with sizes less than 2 mm are subjected to the chemical and
biological properties. DMS dominated by coarse particles are suitable for beneficial
reuse without further treatment. Fines with contaminant levels below the permitted
levels could be directly reused, while those with high levels would undergo
treatment. After treatment, those with reduced contaminant levels fulfilling the
stipulated limits would be considered suitable for reuse. Treated DMS with residual
high contaminant levels exceeding the limits would be assigned to suitable disposal
sites. Laboratory experiments were carried out to identify the physical, chemical and
biological properties according to British Standards (BS 1377 and BS 6068). All the
DMS were mainly silt and clay. There were six heavy metals detected namely
arsenic, chromium, copper, lead, nickel and zinc in all DMS. Based on Sediment
Quality Guidelines (SQG), As, Cr, Pb and Ni in Lumut DMS exceed the TEL values.
Arsenic and nickel concentration in Melaka DMS was exceeded both guideline, ERL
and TEL. The concentration of Cr, Cu and Pb in Melaka was also higher than TEL
limits. The DMS of Tok Bali contained two trace metals (As and Pb) that higher than
ERL and TEL. The Pasir Gudang DMS was high concentration of As and Cr. From
the biological property assessment test, Serratia plymuthic, Vibrio alginolyticus and
Corynebacterium genitalium were detected in Lumut DMS, while Serratia
marcescens, Vibrio vulnificus, Edwardsiella tarda, Bacillus cereus and Escherichia
coli were in Melaka DMS and 14 bacteria detected in Tok Bali DMS. All the
inhabitant bacteria were classified as Risk Group level 2. Based on the results
obtained, treatment is necessary for all DMS prior to consider for reuse or disposal. |
|---|