Abstract—Sediment deposited on the bottom of water
reservoirs is known as clayey waste which causes a big problem
in the sense of sustainability of surface water resources in
Tunisia. Every year, the water storage capacities of reservoirs
are decreased by more than 1%. To cope with this situation,
Tunisian government has adopted a national strategy for water
and soil conservation since 1956. Nevertheless, the
sedimentation rate is still high because this strategy is limited on
the implementation of soil conservation measures such as
terraces and hill lakes in some watersheds. Dredging,
conventional but most effective countermeasure against
sedimentation, is now required to recover the storage capacity
of reservoirs. However, such countermeasure is not carried out
in Tunisia because of its high cost. We have previously
suggested to commercially valorize the sediment in order to
cover partially the financial burden of the dredging activity. In
this paper, we studied on the potential of the use of sediment as
soil amendment. Sediment samples were extracted from
different reservoirs in order to evaluate their ability to adsorb
heavy metals and regulate the metals uptake by crops. Two
methods have been carried out: a batch adsorption study and a
semi field test. Results of this study show that the adsorption
capacity is dependent on the mineralogical composition and the
organic matter content of sediments. Metals are adsorbed on
clay particles and carbonates containing in sediments, which
decrease its mobility and accumulation in plants. The possibility
of sediment valorization as soil amendment or adsorbent
material is confirmed.
Index Terms—Valorization, dredging sediment, soil amendment, adsorption, metals uptake.
Slim Mtibaa, Najet Belkhamsa, and Mohamed Ksibi are with the Laboratory of Water, Energy and Environment, National Engineering School of Sfax, University of Sfax, Route Soukra km 3.5 Po. Box 1173, 3038 Sfax, Tunisia (e-mail: firstname.lastname@example.org, email@example.com, Mohamed.Ksibi@tunet.tn).
Mitsuteru Irie is with the Alliance for Research on North Africa, University of Tsukuba, 305-8577, 1-1-1 Tennodai, Tsukuba, Ibaraki, Japan (e-mail: firstname.lastname@example.org).
Cite: Slim Mtibaa, Najet Belkhamsa, Mitsuteru Irie, and Mohamed Ksibi, "Experimental Study on the Valorization of Dredged Sediment from Reservoirs in Tunisia as Soil Amendment Regulating Metal Uptake by Crops," International Journal of Environmental Science and Development vol. 7, no. 10, pp. 707-714, 2016.