Implementation of solidification/stabilization process to reduce hazardous impurities and stabilize soil matrices

Abstract

A wide variety of technologies is available for the treatment of contaminated soil in both the vadose zone (originating above the water table) and saturated zone (originating below the water table). Several processes involve immobilizing soil contaminants by physically, chemically or biologically. Among them, a wide range of wastes, both solids and liquids, are being treated by “solidification/stabilization” (S/S). In solidification, by adding binding reagents, physical state of the waste being changed by encapsulating a waste to form a solid material from liquid as well as to restrict contaminant migration to leaching by decreasing the exposed surface area. Whereas stabilization through chemical reactions immobilizes the hazardous materials by reducing them to less soluble or toxic form. Characteristics of different types of reagents/additives of S/S technology both from inorganic and organic origin are presented in this paper. In-situ and ex-situ application of S/S technology and their advantages-disadvantages are discussed with basic approaches. Finally, introducing with internal and external factors influencing the long-term durability of S/S treated materials as well as monitoring & treatment management of it after processing are briefly presented

Compressive Strength Prediction of Stabilized Dredged Sediments Using Artificial Neural Network

“…Using the ANN model [4][5][6][7][8][9][10][11][12], the prediction of stabilized dredged sediments compressive strength for training and testing part is shown in Figures 5(a) and 5(b) , respectively. Figure 5 shows that the ANN model's results and experimental results are almost identical for each sample in the training phase.…”

“…In addition, to confirm and verify the performance of the ANN model, an artificial neural network (ANN) was created and adjusted by back-propagation algorithm (BP) with Levenberg-Marquardt (LMA) algorithm. e compressive strength of stabilized dredged sediments has been predicted by ANN models with network structure [4][5][6][7][8][9][10][11][12]. e results show that the ANN model can accurately predict the compressive strength of stabilized dredged sediments with low water content.…”

“…Stabilization/solidification is the improvement of the physical dredged sediments properties such as compressive strength, liquid limit, plastic limit, viscosity, and permeability [1][2][3][4][5]. Some binders are commonly used such as Portland cement, lime, limestone, fly ash, slag, gypsum, phosphorus, and many other commercial products.…”

Enhancing the environmental sustainability of water treatment sludge (WTS) disposal through blended binder solidification/stabilisation

“…Solidification is a widely used technique for remediating sludge before its disposal in landfills. The main objective of this approach is to reduce the leaching of pollutants from the sludge, which can be achieved through physical or chemical processes [3]. This is accomplished by mixing the sludge with a specified binder.…”