Nova Biotechnol Chim (2019) 18(2): 166-178 DOI: 10.2478/nbec-2019-0019  Corresponding author: karimmoussaceb@yahoo.fr Nova Biotechnologica et Chimica Treatment and remediation by the stabilization/solidification process based on hydraulic binders of soil contaminated by heavy metals Rachid Sahnoune and Karim Moussaceb Laboratoire de Technologie des Matériaux et de Génie des Procédés (LTMGP), Faculté de Technologie, Université A/MIRA Bejaia, Route Targa-Ouzemour, Bejaia 06000, Algeria Article info Article history: Received: 21st May 2019 Accepted: 20th November 2019 Keywords: Contamination Heavy Metals Hydraulic Binders Remediation Soils Stabilization/Solidification Abstract Nature and the environment are affected by various human industrial and/or urban discharges. Remediation for this problem requires first and foremost an in-depth analysis and an overall characterization of the intrinsic properties of the pollution- receiving environments. Secondly it is necessary to predict in these environments the behavior of dangerous chemical species (here particularly heavy metals) in the long term. This study focuses mainly on a detailed characterization of 4 soil samples sampled in vicinity of wild dump-BOULIMAT located 15 km west of the city of Bejaia-Algeria. The samples were characterised by atomic absorption spectrometry, X-ray diffraction, Fluorescence X and Infrared spectroscopy. The data showed high concentrations of metallic elements especially Zn (2,651.8 mg.kg-1) and Ni (163.44 mg.kg-1) in the soil samples. For their remediation, the stabilization/solidification (S/S) process with hydraulic binders appeared promising in reducing the polluting power of metal. This approach has considerably reduced the content of pollutants; 98 % removal was obtained for Ni and 99 % for Zn. The XRD analysis technique revealed the occurrence or absence of metallic elements in the crystallized phases.  University of SS. Cyril and Methodius in Trnava Introduction For a long time, waste and landfills have posed a serious problem leading to various environmental issues that industries have created, and developing several diseases including respiratory, dermatological or other. Human is the main driver of technological and scientific development through these innovations that make life simplier and easier, however, he is the main author of pollution generation at the scale industrial (mining, steel, etc.) or domestic (civil) such as household waste, hospital waste (Stuart et al. 1998; Sefouhi et al. 2010; Prasadini et al. 2014). Wastes (solid, liquid, gas) produced are released into the environment in the form of landfills, which are mostly uncontrolled, and in the presence of water, air and in contact with the receiving environment, becomes an active source of pollution developing complex and toxic elements with high geochemical mobility (Sefouhi et al. 2010), which are easy to transport and transfer (Prasadini et al. 2014), contaminating all the environment of proximity (air, soil, waters), thus influencing the life of the individual by the development of several diseases (cutaneous, pulmonary, neurological, etc.) causing an imbalance in the chain of life (Stuart et al. 1998; Sefouhi et al. 2010; Prasadini et al. 2014; Belebchouche et al. 2014). A range of tests and experiments have been conducted in recent years on the analysis and characterization of waste, leaching and modeling Bereitgestellt von Slovenská poľnohospodárska knižnica | Heruntergeladen 28.02.20 12:42 UTC mailto:karimmoussaceb@yahoo.fr Nova Biotechnol Chim (2019) 18(2): 166-178 167 of long-term waste behavior (Bozkurt et al. 2000). Accordingly, this work has two objectives. The first is characterization of the site hosting the wild discharge of the region of BOULIMAT-Bejaia, which opens with all the types of rejections, by determining the physico-chemical parameters (pH, conductivity, moisture), amount of material and particle sizes (granulometry) (Qiao et al. 2007; Chikhi et al. 2012), composition and chemical speciation (XRD, FX, FTIR, TCLP, AAS) (Windt et al. 2007) soils that define the nature and the intrinsic parameters of the discharges (Planel et al. 2004; Laforest et al. 2007), the second objective is to study of the evolution of the soil stability by the addition of hydraulic binders (Zampori et al. 2009; Drouiche et al. 2019). The S/S method is an innovative method, which has been proven in the field by its treatment of more than 57 toxic elements (Gollmann et al. 2010; Du et al. 2010; Moussaceb et al. 2012; Moussaceb et al. 2013) by: (i) chemical stabilization of toxic element by adsorption and/or ion exchange which is the consequence of the formation of chemical bonds between the waste and the hydraulic binder (Fuessle et al. 2004; Moussaceb et al. 2012; EPA 2014), (ii) solidification by the transformation of waste into a solid monolith for the purpose of trapping contaminating species inside the cementitious matrices (Shi et al. 2004; Moussaceb et al. 2012; EPA 2014) thus reducing the mobility of toxic chemical species (EPA 2014) that focus primarily on the addition of a hydraulic binder (Portland cement) to contaminated soil (Moussaceb et al. 2012). According to (Laurent et al. 2007) a study of S/S on samples of contaminated soil performed for 28 days to 1 year made the soil non-dangerous. Further (Rémillard 2012), reported that the decontamination of the soil contaminated with Cd, Cr, Cu, Pb, Zn (Shannon, Municipality, Canada) with S/S showed very good trapping results even after a long leaching period. Tests conducted by Soliditech. Inc. on a site contaminated by Pb and PCB in the region Morganville, New Jersey (USA) demonstrates a good application potential of the method (Bisson et al. 2012). Preliminary results of soil samples from the site examined in this work showed a high zinc and nickel content, thus presenting a site overload by these two elements. The soil samples treated by the S/S process for a 28-day curing period, showed retention rates in Zn/Ni metals of up to 99 % in the cementitious matrices. Experimental For an eventual physico-chemical and mechanical analysis of our soil samples, an arsenal of standardized methods (FX, XRD, FTIR, AAS) as well as standardized tests (granulometry, humidity, electrical conductivity, pH, TCLP) were used to achieve our objectives, namely: (i) determination of the intrinsic properties of the contaminated soil samples, (ii) improvement of the trapping of heavy metals inside the cementitious matrices (Segolene 1992). Sampling Sampling was carried out at the BOULIMAT-Bejaia landfill site after shovelling and evacuation of the first two centimeters with a stainless shovel, four soil samples to a depth of up to 40 cm were carried out according to the method of Targeted Sampling according to ISO 1993 and EPA 1991. The sampling points are shown in Fig. 1 and their coordinates in Table 1 (Pellet et al. 1993; Liliane et al. 2007; Bisson et al. 2012). Table 1. Location of soil sampling points with the decimal degree system (DDS). Sample Index Latitude (N) ° X Longitude(E) ° Y E (I) 36.789016 5.007027 E (II) 36.789283 5.007847 E (III) 36.789030 5.008666 E (IV) 36.788747 5.009202 Determination of selected physical parameters The soil samples were treated according to ISO 11464, which consists of drying in the open air for 15 days before proceeding to physico-chemical analyzes (Pellet et al. 1993; Ministère du Développement Durable, de l’Environnement et des Parcs du QUEBEC 2010; Bisson et al. 2012). Sieving granulometry determined the particle size distribution of soil by fractionation on the Shakers SV008 sieving machine according to AFNOR NF Bereitgestellt von Slovenská poľnohospodárska knižnica | Heruntergeladen 28.02.20 12:42 UTC Nova Biotechnol Chim (2019) 18(2): 166-178 168 Fig. 1. Sampling points of the BOULIMAT-Bejaia landfill, the number 1-4 correspond to samplings sites of the samples EI-EIV (Table 1). X31-101 (Violaine 2007; Bisson et al. 2012). Residual moisture measurement determined the dry mass lost of a soil sample dried at 103±3 °C whose mass is constant at 40 °C, according to AFNOR NF X31-102 (Segolene 1992; Marie et al. 2012). pH (H2O) of soils was determined according to AFNOR X 31-103 recommends with the HANNA pH211 device (Segolene 1992; Liliane 2007; Kebir 2012). Electrical conductivity was determined by the dissolution of a soil sample in water according to the solid/liquid ratio, and which is measured with the apparatus HANNA EC215, according to AFNOR NF X 31-113 (Segolene 1992). 𝑆/𝐿 = 1/5 …………… (1) Mineralogical composition – X-ray diffraction (XRD) X-ray diffraction consists in the identification of minerals by electron bombardment in the form of electromagnetic waves, where the atoms follow a specific arrangement according to the crystalline planes following to the BRAGG law. 𝑛𝜆 = 2𝑑 ∗ 𝑆𝑖𝑛Ɵ° ………… (2) where 𝑛 – diffraction order, 𝜆 – X-Ray wavelength, d – inter-reticular distance, Ɵ° – Bragg Angle. The indexation of peaks allows the identification of mineralogical phases present by referring to the American Society or Testing Materials (ASTM) sheets. The diffractograms of our soil samples were obtained on the device after treatment with Panalatical X'pert Hight Score (Ministère du Développement Durable, de l’Environnement et des Parcs du QUEBEC 2010; Marie et al. 2012; Eti 2012; Moussaceb et al. 2019). Fourier Transform Infra-Red (FTIR) spectrometry The FTIR is used to identify the functional groups existing within our soil samples following a vibrational transition interval between 4000 – 400 cm-1 (Mejbri et al. 1995; Mounia 2013) with the spectrometer SHIMADZU IRAffinity-1S, samples preparation is made in KBr pellet. Chemical composition The simple extraction procedures are methods that run in one step, and those using several methods. These concluded: (i) X-ray fluorescence, which gives the proportions of the major elements as an oxide by bombardment of the sample surface with X photons, performed using the SKYRAY 7000XRF experimental setup. (ii) atomic absorption spectrometry (Thermo Scientific ICE 3000) was used for the quantification of trace elements present in soil samples to be treated and those after acid leaching preparation (Toxicity Characterisation Leaching Procedure – TCLP) (Bisson et al. 2012; Drouiche et al. 2019). Leaching tests The TCLP-EPA 1311 test is a method used to evaluate the mobility of inorganic species in order to evaluate whether an industrial residue is considered as a dangerous leachable material or not. Bereitgestellt von Slovenská poľnohospodárska knižnica | Heruntergeladen 28.02.20 12:42 UTC Nova Biotechnol Chim (2019) 18(2): 166-178 169 It is carried out by dissolving a soil sample in a solution containing 2.572 g of sodium hydroxide and 5.7 mL of acetic acid with a solid/liquid ratio: 𝑆/𝐿 = 1/20.....................… (3) where the leachate recovered after filtration was analyzed for heavy metals by atomic absorption spectroscopy (AAS) (Lassin 2002; Liliane 2007; Moussaceb et al. 2019). Soil samples processing Once the soil samples have been characterized, an operation of treatment was carried out, and for this purpose mixtures of several variation were established by addition of contaminated soil (between 0 and 40 %) and cement. The cement used in this study is Portland cement CEM I from Ain El Kbira, Algeria. Table 2 shows the formulations made in accordance with standard NF P 98-230-3 (Bozkurt et al. 2000; Prasadini et al. 2014). The constituents were introduced into a mixer and mixed dry for 2 min. then they spread on a non- contaminating surface at the thickness of the largest grain and then the water is added by spraying and they are left for 28 days at a ambient temperature (20±3 °C) to undergo characterization tests, namely: XRD, FX, TCLP (Berger 2009). The realization of the mixtures soil/ cement is based on the report (Bouzeroura et al. 2018). 𝑤/(𝑐 + 𝑠) = 0.5…………… (4) with: w – mixing water [mL], c – Portland cement [g], s – contaminated soil [g]. The quantities of cement are fixed at 450 g and those of the soil are varied from 0 to 40 %. The quantities used are given in Table 2. Table 2. Mixtures formulations with quantity of cement (Mc), water (W) and soil (S). Mc+S [g] Mc [g] W [mL] S [g] (s/c) ×100 [%] w/(s+c) 495 450 247.5 45 10 0.5 540 450 270 90 20 0.5 585 450 292.5 135 30 0.5 630 450 315 180 40 0.5 Table 3. Granulometry parameters of soil samples (Jerome et al. 2012). Laws and Parameters Unit EI EII EIII EIV D5 Particles Diameter at 5 % mm 0.09 0.13 0.10 0.07 D10 Particles Diameter at 10 % mm 0.18 0.27 0.23 0.11 D16 Particles Diameter at 16 % mm 0.33 0.45 0.39 0.18 D25 Particles Diameter at 25 % mm 0.61 0.76 0.67 0.34 D30 Particles Diameter at 30 % mm 0.91 0.98 0.87 0.48 D50 Particles Diameter at 50 % mm 1.48 1.75 1.45 1.23 D60 Particles Diameter at 60 % mm 1.88 1.97 1.79 1.62 D75 Particles Diameter at 75 % mm 2.52 2.5 2.45 2.32 D84 Particles Diameter at 84 % mm 2.98 3.02 2.93 2.84 D90 Particles Diameter at 90 % mm 3.30 3.34 3.29 3.24 D95 Particles Diameter at 95 % mm 3.65 3.66 3.63 3.57 Curvature coefficient 𝑪𝒄 = 𝑫𝟑𝟎 𝟐 𝑫𝟔𝟎⁄ ∗ 𝑫𝟏𝟎 C te 2.44 1.80 1.84 1.29 Uniformity coefficient 𝑪𝒖 = 𝑫𝟔𝟎 𝑫𝟏𝟎⁄ C te 10.44 7.29 7.78 14.72 Sorting index (Trask) 𝑺𝒐 = √ 𝑫𝟕𝟓 𝑫𝟐𝟓 Cte 2.03 1.83 1.91 2.61 Asymmetric Trask coefficient 𝑺𝒌 = 𝑫𝟐𝟓 ∗ 𝑫𝟕𝟓 𝑫𝟓𝟎 𝟐 Cte 0.70 0.63 0.78 0.52 Inter-quartile 𝜟 = √ 𝑫𝟖𝟒 𝑫𝟏𝟔 ⁄ Cte 3.00 2.59 2.74 3.97 Angularity coefficient (Kurtosis) K = (𝑫𝟕𝟓−𝑫𝟐𝟓) 𝟐∗(𝑫𝟗𝟎−𝑫𝟏𝟎) Cte 0.30 0.29 0.29 0.31 Porosity P = 0.13 + 0.21 (𝐷50+0.002) 0.21 mm -1 0.32 1.75 2.11 2.54 Dispersion index (FOLK/WARD) D = (𝐷84−𝐷16) 4 + (𝐷95+𝐷5) 6.6 mm 1.20 1.17 1.17 1.19 Asymmetric index of Krumbein Ski = (𝑫𝟕𝟓+𝑫𝟐𝟓)−(𝟐∗𝑫𝟓𝟎) 𝟐 mm 0.085 0.085 0.11 0.10 Bereitgestellt von Slovenská poľnohospodárska knižnica | Heruntergeladen 28.02.20 12:42 UTC Nova Biotechnol Chim (2019) 18(2): 166-178 170 Results and Discussion Characterisation of sampled, non-treated soil Granulometry distribution was rather similar for tested soil samples (for EI shown in Fig. 2A) from values of individual parameters (Table 3) it can be seen that the values of the coefficients recorded are as follows: curvature coefficient ranged between 1.29 – 2.44, uniformity coefficient between 7.29 – 14.72, sorting index (Trask) between 1.83 – 2.61, asymmetric Trask coefficient between 0.52 – 0.78, inter-quartile between 2.59 – 3.97, angularity coefficient (Kurtosis) between 0.29 – 0.31, porosity in range of 0.31 – 0.33, dispersion index (Folk/Ward) between 1.16 – 1.20, asymmetric index of Krumbein in range of 0.085 – 0.11. Fig. 2. Characterisation of non-treated soil samples. Granulometry distribution of soil sample EI and the grain diameters at percentage between 5 % to 95 % corresponding to D5 to D95 (A). Weight distribution of the same soil sample according to sieves series in range 0.063 – 4 mm, depending on the AFNOR NF X31-101 standard (B) corresponding data are given in Table 3. These data point on a varied grain size, a spread and poorly graded distribution, and a ranking of the grain size on the coarse fraction side with a random arrangement of poorly sorted spheres. (Blott and Pye 2001; Jerome et al. 2012). Thus, our samples represent a spreading and well graded particle size. The results in Fig. 2B show the weight distribution of sample EI. Highly similar pattern was observed for the weight distribution of EII-EIV samples (data not shown). It is concluded that our soil samples have the same weight proportions with a high mass presence at mean diameters (2 and 1.5 mm). These represent respectively the intervals 2 – 1 mm and d > 2mm, and which vary between 32.34 % – 39.57 % and 25.4 % – 32.25 %, respectively. According to the standard NF P18-560 and according to the classifications of Strakhov and Wentworth (Jerome et al. 2012), it is concluded that our soil is coarse sand-type. The main properties of soil samples are shown in Table 4. The data show that the moisture content varies between 1.11 % and 3.10 %. These values are strongly linked to actual climatological factors during the moment of sampling just after the summer period of 2016/2017, as well as the presence of waste that makes the soil hydrophobic to water. According to Souhila (2005) the loss of mass in the soil does not only refer to water but also to the evaporation of volatile organic matter likely to intervene at 60 °C. The pH of soil samples varies between 8.05 and 8.25 (Table 4), suggesting that the soil is an alkaline soil (Marie 2009), favoured by the dominant geological formation of the study site which is calcareous- sedimentary formation. According to Souhila (2005) basic pH values have been found in the geological state of the studied soil and which is alkaline. Furthermore, Kebir (2012) reports that the basic pH of soil samples of the landfill refers to biological activity in field. Table 4. Physical parameters of soil samples according to AFNOR NF X31 standards. Sample Moisture [%] pH (H2O) Conductivity [mS.Cm-1] E I 3.05 8.20 689 E II 2.47 8.05 1173 E III 3.10 8.10 958 E IV 1.11 8.25 519 A B Bereitgestellt von Slovenská poľnohospodárska knižnica | Heruntergeladen 28.02.20 12:42 UTC Nova Biotechnol Chim (2019) 18(2): 166-178 171 Fig. 3. Infrared spectrum of soil samples from localities EI-EIV (Fig. 1) before treatment. The values of conductivities range from 519 to 1,173 mS.cm-1, which is classified as slightly saline soil according to DURAN scale (Marie 2009). These values indicate a strong interaction between the salts present in the soil and the mineral character of the study site. Fourier transform infrared spectroscopy (FTIR) was applied to identify functional groups. The analysed soil samples have a high siliceous rock content, which has a vibrational domain at 2,100 cm-1 and 1986 cm-1 and then at 1,124 cm-1 and 1162 cm- 1. For calcareous rock, there are strong transition at 2506 cm-1, 1,790 cm-1 and 1,400 cm-1, whereas the vibrational plugs of the intermolecular water appear at 3,408 cm-1, 3,364 cm-1, 3,396 cm-1 and 3,378 cm-1 for samples EI, EII, EIII and EIV, respectively. The latter reappear at 1,637 cm-1 and 1,634 cm-1 for EII and EIII, respectively. Similar results were found from an FTIR characterization study on soil samples from southern Brazil (Dick 2003). Table 5 summarizes the overall results for each soil samples. The infrared spectrum from soil samples is presented in Fig. 3 and corresponding functional groups are characterised in Table 5. The results of X-ray fluorescence showed that soil samples EI, EII and EIII have high proportions of SiO2, ranging from 45.80 % to 50.37 %, and Al2O3 ranging from 13.77 % to 15.09 % (Table 6). A low CaO content of 11.67 % to 18.39 % was recorded as well. On the other hand, the soil sample IV has a high proportion of CaO, which is of the order of 48.39 % and low levels of SiO2 and Al2O3 (19.06 % and 7.27 %, respectively). The presence of metal elements in small proportions in the form of traces has been observed. These results can be explained by the fact that the soil samples EI, EII and EIII were taken in places with a high presence of silica and alumina, resulting from the rejections of the discharge in question, which consist of glasses and aluminum, and their provenance from the mother rock of the region which is rich in silicates and aluminates. On the other hand, the results obtained in the soil sample EIV are confirmed by the fact that the sampling was carried out on the eastern periphery of the landfill and close to a limestone bed (aggregate quarry). The metallic trace elements found in these soil samples returned to the nature of the waste Bereitgestellt von Slovenská poľnohospodárska knižnica | Heruntergeladen 28.02.20 12:42 UTC Nova Biotechnol Chim (2019) 18(2): 166-178 172 Table 5. Infrared spectroscopy of the functional groups from soils samples using SHIMADZU IRAffinity-1S (Foil et al. 1952; Maglione et al. 1975). Soil Sample Wavelength [Cm-1] Identification Band EI EII EIII EIV ND 3626 3623 3626 Vibration Si-O-H of Clay 3408 3363 3396 3378 Vibration OH of H2O ND ND ND 2506 Calcite ND 2108 2111 2101 Vibration Si-O of Quartz 1986 1998 1990 2003 Vibration Si-O of Quartz 1798 1790 1796 1796 Calcite ND 1637 1634 ND Vibration OH of H2O 1407 1422 1406 1410 Calcite 1125 ND ND 1163 Si-O of Quartz 1035 983 1002 1009 Vibration of Si-O of Alumino-Silicate 872 871 874 875 Vibration of CO3 of CaCO3 ND 776 776 798 Vibration of CO3 of CaCO3 714 ND 710 713 Vibration of CO3 of CaCO3 ND 693 695 ND Calcite/Quartz 663 ND ND ND ND 607 ND ND ND ND 517 526 522 526 Vibration of SI-O-Al 419 447 449 465 Vibration of Si-O-Si discharged into the landfill (household, hospital, urban and industrial waste, etc.). According to Antonine (2012) the high abundance of CaCO3 content refers to the presence of carbonates in rocks of study site and for metallic minerals in the form of hydroxide or sulphide. The chemical compositions of analysed soil samples are shown in Table 6. The leachates obtained by dissolving (TCLP test) were subjected to a chemical analysis, by AAS, to determine the contents of the metallic elements. It is found that the contents of the soil samples (Table 6) perfectly meet the AFNOR NF U44-041 (1985) (Segolene 1992) standard except for [Ni] > 50 mg.kg-1 in the soil sample EI and [Zn] > 300 mg.kg-1 in the soil sample EIII. The results shown in Table 6 can be justified by acid rain, which frequently affects the region, thus promoting the migration of heavy metals through leachates that percolate from the landfill to the surrounding soil. According to Kebir (2012) the persistence of these metallic elements concentrations refers to the origin of the waste as well as to the industrial effluents discharged into the landfill. According to the XRD results, the soil has a similarity in initial mineralogical composition, which is a clay soil consisting mainly of quartz and calcite, with heterogeneity in the secondary phases that show contamination with heavy metals. Examples include Dwornikite and Retgersite for EI and Wurtzite, Hopeite and Hetaerolite for EIII. The diffractograms of soil samples EI and EIII are shown in Fig. 4, while the corresponding mineralogical phases are summarized in Table 7. Table 6. Chemical composition of the analysed soil samples from localities E-EIV. Soil sample EI EII EIII EIV Compound content [%]a SiO2 50.37 47.07 45.80 19.6 Al2O3 15.9 13.77 14.9 7.27 Fe2O3 4.74 5.2 5.14 4.17 CaO 11.67 16.20 18.39 48.39 MgO <0.05 ND ND 0.79 Na2O <0.05 <0.05 <0.05 <0.05 K2O 2.7 2.2 2.4 1.7 TiO2 0.48 0.46 0.48 0.23 MnO 0.09 0.20 0.13 0.19 P2O5 0.28 0.42 0.35 0.76 SO3 0.09 0.15 0.05 0.021 NiO 0.0028 0.0035 0.0026 <0.005 ZnO 0.0088 0.0071 0.0056 0.019 PbO 0.0031 0.0028 0.0057 0.0123 Metal content [mg.kg-1]b Zn 9.388 4.194 2651.8 20.78 Ni 163.44 38.3 0.22 > associés. Etude Bibliographique. Rapport BRGM/RP-51518-FR, p. 17-20. Laurent C (2007) Solidification/stabilisation des déchets dangereux- procédés à base de liants minéraux. Agence de l’environnement et de la maitrise de l’energie, ADEME - France, 6 p. Liliane J (2007) Mobilisation du chrome et du nickel a partir de sols contaminés, en présence de complexant : transfer et accumulation de ces métaux chez datura innoxia. University of Limoges, France, p. 47-52. 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