Alternative Strategies for the Disposal of UK Estuarine Dredgings

UK research into the beneficial uses of dredged material is being undertaken at Strathclyde University, and includes initiatives in research in the use of dredgings for soil in land restoration projects, and for brick manufacture. Extensive research in the historically industrial River Clyde in Scotland has shown that pollutant levels do not preclude the use of selected materials for land restoration work. However, limitations are imposed on the use of the material for agricultural or grazing purposes at this time. Brick manufacture from clay sediments has proved that an attractive, quality product can be provided to the industry although some further testing is required; particularly in the area of atmospheric emissions during firing. The use of dredged clay for landfill capping and lining also remains a viable possibility. Economic considerations for each application vary, and require further investigation, however, the options are technically feasible and if employed on a larger scale, can account for a significant proportion of dredged sediments which are currently disposed of at sea.

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FEATURES OF MONITORING OF DEGRADED LANDS TO ASSESS POSSIBILITIES FOR THEIR REHABILITATION

Prirodoobustrojstvo ◽

10.26897/1997-6011-2020-4-37-43 ◽

2020 ◽

pp. 37-43

Author(s):

B.I. KORZHENEVSKIY ◽

◽

N.V. KOLOMIYTSEV ◽

G.YU. TOLKACHEV

Keyword(s):

Agricultural Land ◽

Meteorological Data ◽

Morphological Characteristics ◽

Energy Reserves ◽

Land Restoration ◽

Degraded Land ◽

Degraded Lands ◽

The Past ◽

Unused Land ◽

Restoration Work

Putting out of using large areas of agricultural lands in the central region over the past years has led to worsening the prospects of their purposed use, although the problem of the relevance of their restoration still remains. For many years the unused land was exposed to both natural exogenous processes such as erosion, suffusion, etc. and biological and chemical changes, usually for the worse for agriculture. There are considered elements of monitoring aimed at assessing the prospects or lack of perspectives of rehabilitation of degraded lands. An energy approach to assessing the state of slopes and soils located within these slopes is presented. The main factors of natural and anthropogenic character in assessing the prospects for land restoration are their steepness, excess relative to local bases of erosion other morphological characteristics of slopes which in general is reduced to an assessment of the energy provision of slopes and soils. So the higher the energy capacity of slopes – they are less promising for development, for soils – there is a reverse picture – the higher their energy reserves, the more promising is their use. Approaches to zoning the territory for monitoring from larger taxons of natural and anthropogenic genesis to the sites of special surveillance within which the prospects for rehabilitation of the agricultural land are evaluated. The most important factor is the material expediency of such actions, i.e. before starting the restoration work it is necessary to assess the profitability or loss of the proposed event. In cases of the material expediency it is feasible as further actions to include energy assessments of slopes and soils; zoning of the object according to the steepness and oriented characteristics of soil washout; and the possibility of obtaining agronomic and meteorological data on a timely basis. The result of the work is a forecast assessment of the prospects for restoring degraded land for the intended purpose using modern databases and WEB-systems.

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Environmental Effects of Dredging Program: Inland Waterways: Proceedings of a National Workshop on the Beneficial Uses of Dredged Material Held in St. Paul, Minnesota on 27-30 October 1987

10.21236/ada204670 ◽

1988 ◽

Author(s):

Mary C. Landin

Keyword(s):

Environmental Effects ◽

Dredged Material ◽

Inland Waterways ◽

Beneficial Uses ◽

National Workshop

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Characterization of Coastal Dredged Sediments Used in Land Restoration Projects

Geo-Congress 2014 Technical Papers ◽

10.1061/9780784413272.205 ◽

2014 ◽

Cited By ~ 1

Author(s):

Malay Ghose Hajra ◽

Gregory Mattson, II

Keyword(s):

Land Restoration ◽

Dredged Sediments

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Beneficial Uses of Dredged Material in Green Infrastructure and Living Architecture to Improve Resilience of Lake Erie

Infrastructures ◽

10.3390/infrastructures3040042 ◽

2018 ◽

Vol 3 (4) ◽

pp. 42 ◽

Cited By ~ 2

Author(s):

Shruti Bhairappanavar ◽

Rui Liu ◽

Reid Coffman

Keyword(s):

Water Quality ◽

Green Infrastructure ◽

Lake Erie ◽

Commercial Product ◽

Unit Weight ◽

Water Retention Capacity ◽

Growth Media ◽

Dredged Material ◽

Beneficial Uses ◽

Leachate Water

To maintain the navigational depth, 1.15 million cubic meters (1.5 million cubic yards) of sediment is dredged out from the federal harbors every year from Lake Erie, Ohio Coast. Treating this huge amount of dredged material is a major challenge due to the mobilization of potential contaminants causing depreciation in water quality and depletion of valuable land. Rather than treating the dredged material as a waste, we suggest investigating alternative ways to recycle and reuse the material within Green Infrastructure (GI) and living architecture applications. This study identifies potential applications of the dredged material in bioretention and vegetative roof systems, and examines the role of dredged material in these edaphic conditions. The paper discusses the beneficial uses of dredged material in GI by investigating the quality of dredged material and performances of GI built using dredged material through laboratory and field-testing. Preliminary results of a growth media using dredged material for the vegetative roof have been developed in lab/field studies that possess the performance values comparable to the current commercial product. The growth media containing lightweight aggregate, made from the dredged material, is observed to have high water retention capacity and high unit weight in comparison to a commercial product. The growth media leachate water test demonstrated the water quality to be comparable to the drained water from the commercial product. The growth media overwintered and advanced a rare plant species, Viola pedatifida, which is similar to conventional media. The beneficial uses of dredged material in the GI will help maintain the economic viability of harbors and ports along the shoreline of Lake Erie in Ohio and GIs, which were built using dredged material that can help address storm water management issues in urban areas due to extensive impervious surfaces.

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Experimental Study on the Improvement of High Water Content Dredged Material by Cement and by Quicklime

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.878.714 ◽

2014 ◽

Vol 878 ◽

pp. 714-719 ◽

Cited By ~ 1

Author(s):

Ying Hao Huang ◽

Chan Dong ◽

Xiao Lei Zhan ◽

Yun Fei Guan

Keyword(s):

Water Content ◽

High Water ◽

High Water Content ◽

Dry Density ◽

Dredged Material ◽

Test Results ◽

Environmental Friendly ◽

Dredged Materials ◽

Beneficial Uses ◽

Modified Soil

Dredging is necessary to keep rivers, harbors and lakes function normally. These dredged materials (DM) have poor geotechnical properties and are normally treated as wastes. Thus, utilization of DM for beneficial uses such as fill is being considered as an environmental-friendly and economical option. In this study a dredged material taken from Tai-hu Lake was modified by adding quicklime and by Portland cement. Water content, dry density, plasticity, and California bearing ratio (CBR) of the two types of modified soil were determined and compared. Test results show that both quicklime and cement can evidently decrease the water content and increase dry density, but the former can get better effect relatively. On the other hand, both quicklime and cement can significantly decrease the plasticity characteristics, and change the raw DM classified as CH to MH after modified, moreover, the cement has better effect on the improvement of plasticity. For the same additive content and curing days, the cement modified soil has larger CBR strength than that of the quicklime modified soil. Conclusions of the paper maybe beneficial and useful for the solidification material choose, and for practical dredged material solidification projects.

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Attempts to Develop Beneficial Uses for Milwaukee Harbor and Green Bay Harbor Dredged Material

Dredging '02 ◽

10.1061/40680(2003)49 ◽

2003 ◽

Author(s):

David W. Bowman ◽

Tommy E. Myers ◽

Richard A. Price ◽

Scott Cieniawski

Keyword(s):

Dredged Material ◽

Green Bay ◽

Beneficial Uses

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What after cryptogenic stroke – NOAC for everyone or ICM for some?

In a good rythm ◽

10.5604/01.3001.0013.0505 ◽

2019 ◽

Vol 4 (49) ◽

pp. 25-27

Author(s):

Michał Karliński

Keyword(s):

Atrial Fibrillation ◽

Therapeutic Strategy ◽

Randomized Trials ◽

Significant Proportion ◽

Cryptogenic Stroke ◽

Ecg Monitoring ◽

Optimal Model ◽

Common Cause ◽

Current Thinking ◽

Economic Considerations

Atrial fibrillation (AF) is by far the most common cause of stroke with cardiovascular etiology. It is commonly believed that a significant proportion of ischemic strokes of an unknown cause are in fact also embolic (ESUS). This leads to consideration that patients after ESUS are potential candidates for chronic NOAC treatment. However, the therapeutic strategy constructed in such a simple way has been verified negatively in recent randomized trials. It is uncertain whether the pharmaceutical industry will be interested in continuing research in a subpopulation of ESUS patients with a particularly high risk of AF. However, it is now possible to strive for extended ECG monitoring aimed at detecting paroxysmal AF that is not detected by standard post-stroke diagnostic workup. In both scenarios, pragmatic and economic considerations make it necessary to develop a method of proper patients selection. The discussed analysis of data collected during the CRYSTAL-AF study, discussed by me, allows to better understand the imperfection of the current thinking about ESUS and provides information that may development the creation of an optimal model for dealing with this group of patients.

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