Disposal of Sediments for Sustainability: A Review

Abstract

In the coastal areas, dredging operations are undertaken for creation, draft enhancement and maintenance of navigable channels for port and harbor activities. Dredging may also be performed in rivers or reservoirs for similar reasons. The dredged sediments may be disposed at on-land or oceanic sites. In the recent years, inexpensive ocean dumping is being eliminated as a disposal alternative, causing a crisis in the management of sediment. In construction industry, production of concrete creates heavy demand on the supply of raw materials for cement and also aggregates for concrete. In many locations, habitat restoration and tidal flat creation also generates demand of fine aggregates. It has been observed that at several sites, supply from quarry is not always an economic and feasible option. Sustainable solution to both the aforementioned problems is re-using the sediments from river and ocean in construction industry or bio-diesel production. Various applications attempted in construction industry include those for production of cement, as fine aggregate in concrete, in construction of pavements, in production of lightweight concrete, among others. This article presents a review of approaches employed to recycle dredged sediments in construction industry and biodiesel production.

Mix Design of Interlocking Concrete Paving Block (Icbp) Using Dredged Sand From Five Different Riverbeds in Bangladesh

“…Under the research, the authors measured the variations of different parameters of dredged sediments by analyzing heavy metal concentrations, some pollutants, specific granular fractions and organic contents. (Dauji, 2017) Stated that dredging at coastal areas and river-side areas were done for the operation of "navigable channel for port and harbor activities". The most economical way to dispose river-dredged sand was "Ocean Dumping" but due to the discard of that practice, the author explored into alternative means to utilize the excessive sediments buy using it in construction industries (e.g.…”

Valorization of Dredged Harbor Sediments through Lightweight Aggregate Production: Application of Waste Oyster Shells

“…Ocean disposal may cause unexpected adverse impacts on marine ecosystems [7]. Therefore, some countries have developed sustainable methods to resolve the problem of sediment disposal in different fields, such as brick production [8], paving block production [9], pavement construction [10], beach replenishment, and land reclamation [11]. Some studies used dredged sediments, particularly lake and reservoir sediments, to form selfconsolidating or non-structural concretes mixed with binders [12,13].…”