scholarly journals Leaching of Metals from Steel Slag and Their Ecological Effects on a Marine Ecosystem; Validating Field Data with Mesocosm Observations

2021 ◽  
Author(s):  
Edwin M. Foekema ◽  
Jacqueline E. Tamis ◽  
Ainhoa Blanco ◽  
Babeth Weide ◽  
Cor Sonneveld ◽  
...  
Keyword(s):  
Field Data ◽  
Marine Ecosystem ◽  
Steel Slag ◽  
Ecological Effects

scholarly journals Some Insights to the Reuse of Dredged Marine Soils by Admixing with Activated Steel Slag

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Chee-Ming Chan ◽  
Ainun Nazhirin Abdul Jalil
Keyword(s):  
Unconfined Compressive Strength ◽  
Soil Structure ◽  
Marine Ecosystem ◽  
Steel Slag ◽  
Strength Test ◽  
Curing Time ◽  
Strength Gain ◽  
Weak Soil ◽  
Compressive Strength Test ◽  
Slag Content

Regular dredging is necessary for the development of coastal regions and the maintenance of shipping channels. The dredging process dislodges sediments from the seabed, and the removed materials, termed dredged marine soils, are generally considered a geowaste for dumping. However, disposal of the dredged soils offshores can lead to severe and irreversible impact on the marine ecosystem, while disposal on land often incurs exorbitant costs with no guarantee of zero-contamination. It is therefore desirable to reuse the material, and one option is solidification with another industrial waste, that is, steel slag. This paper describes the exploratory work of admixing dredged marine soil with activated steel slag for improvement of the mechanical properties. An optimum activation concentration of NaOH was introduced to the soil-slag mixture for uniform blending. Specimens were prepared at different mix ratios then left to cure for up to 4 weeks. The unconfined compressive strength test was conducted to monitor the changes in strength at predetermined intervals. It was found that the strength does not necessarily increase with higher steel slag content, indicating an optimum slag content required for the maximum solidification effect to take place. Also, regardless of the slag content, longer curing time produces greater strength gain. In conclusion, steel slag addition to dredged sediments can effectively strengthen the originally weak soil structure by both the “cementation” and “filler” effects, though the combined effects were not distinguished in the present study.

A Numerical Study on Change in the Marine Environment of Tokyo Bay in the Latest 70 Years

2003 ◽  
Author(s):  
Daisuke Kitazawa ◽  
Masataka Fujino ◽  
Shigeru Tabeta
Keyword(s):  
Numerical Simulation ◽  
Marine Environment ◽  
Field Data ◽  
Numerical Study ◽  
Marine Ecosystem ◽  
Oxygen Demand ◽  
Ecosystem Model ◽  
Tokyo Bay ◽  
Marine Ecosystem Model ◽  
The Impact

A numerical study by means of a marine ecosystem model is conducted to examine the causes of change in the marine environment of Tokyo Bay in the latest 70 years. First, the marine ecosystem model is validated by comparing the predicted water quality such as water temperature, dissolved oxygen (DO), chemical oxygen demand (COD), total phosphorus (T-P) and total nitrogen (T-N) for the year of 1994 with the field data, which has been observed at 48 spots in Tokyo Bay. In addition, topography of Tokyo Bay and the discharge of chemical matters from the rivers are estimated for each year of 1935, 1979, and 1994, and the marine environment in the summer of each year is reproduced by numerical simulation. From comparing the results, it is revealed that the marine environment varies corresponding mainly to change in the discharge of chemical matters, and that the impact of reclamation is about 30% of the impact of change in the discharge of chemical matters.

Some ecological effects of entering a field of study.

1969 ◽  
Vol 60 (4, Pt.1) ◽  
pp. 284-293 ◽  
Author(s):  
Donald L. Thistlethwaite
Keyword(s):  
Ecological Effects ◽  
Field Of Study

Boussinesq Wave Model Compared with Field Data

2001 ◽  
Author(s):  
Denis Morichon ◽  
Barbara Boczar-Karakiewicz ◽  
Edward B. Thornton
Keyword(s):  
Field Data ◽  
Wave Model

Mekanisme Dan Proteksi Jaminan Nasabah Pada Gadai Informal

Liquidity ◽  
2017 ◽  
Vol 6 (2) ◽  
pp. 103-109
Author(s):  
Yuri Nanda Larasati ◽  
Jafril Khalil
Keyword(s):  
Qualitative Research ◽  
Research Methods ◽  
Financial Services ◽  
Field Data ◽  
Qualitative Research Methods ◽  
Research Field ◽  
Consumer Society ◽  
Library Research ◽  
The Cost

Regulation of the financial services authority (OJK) No. 31/POJK.05/2016 on Venture had arranged that the financial services agency on the basis of the law of pledge is in coaching and supervision OJK. Yet the existence of laws – invitation to Governing Enterprise pawn shops causing business activities conducted by the above parties are not yet regulated. The condition is feared could cause harm to the consumer society. The purpose of this research is to know the procedures, mechanisms, protection of goods and guarantee the consumer on an informal pledge financing, methods of determination of the cost of maintenance of the goods and the goods of the execution mechanism of the pledge as well as protection for the collateral items are viewed from the side of the consumer by looking at laws-invitations and Sharia. To find out whether the pledge have gotten permission from OJK. This research uses qualitative research methods with the study of library research, field data and simulations. The approach used in this study is the empirical juridical approach. Elaboration upon the results is discussed further in this article.

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