Abstract
Purpose
The aim of this study was to inquire about the removal efficiencies of lead and cadmium in paddy soil by a composite electrolyte of sodium chloride and citric acid under electrokinetic remediation.
Materials and methods
The experiment was operated in a plexiglass tank, which was divided into one soil column (length × width × height = 20 cm × 5 cm × 5 cm) and two electrode chambers (length × width × height = 6 cm × 5 cm × 5 cm).
Results and discussion
In this paper, the composite electrolyte (sodium chloride + citric acid) which combined the merits of two different chemicals was investigated for electrokinetic remediation of lead- and cadmium-contaminated paddy soil under a voltage gradient of 1.5 V/cm during a 20-day treatment. The total concentrations of lead and cadmium in the initial soil were 940.83 and 4.51 mg/kg, respectively. As sodium chloride was solubilized in solution, a number of Na+, Cl−, OH−, and H+ ions were generated that could dissolve some of Pb and Cd in soil to form Cd–Cl and Pb–Cl. When the lead- and cadmium-contaminated paddy soil was implemented with 0.1 M sodium chloride, the total removal efficiencies of lead and cadmium were 23.10 and 27.94%, respectively, which were little higher than those implemented with deionized water. Citric acid was not only used to control pH, but it can also combine with metals to form soluble M-citrate. When sodium chloride was mixed with citric acid in electrokinetic (EK) remediation, high redox potential was obtained that forced most of the metals to migrate out from soil. The overall removal efficiencies of lead and cadmium were increased from 56.85 and 62.26% with single citric acid electrolyte to 80.37 and 90.86% with composite electrolyte of sodium chloride and citric acid, respectively. Eventually, the residual concentrations of lead and cadmium in the soil were only 184.70 and 0.41mg/kg, respectively, which met the demand of agricultural production and human health requirements.
Conclusions
Citric acid + sodium chloride treatment poses less environmental risk than inorganic acid (HCl, HNO3, and H2SO4). There is good synergistic effect of sodium chloride and citric acid during the EK remediation process. Thus, citric acid + sodium chloride is considered as an effective electrolyte to remove lead and cadmium from paddy soil.
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References
Acar YB, Alshawabkeh AN (1993) Principles of electrokinetic remediation. Environ Sci Technol 27(13):2638–2647. https://doi.org/10.1021/es00049a002
Acar YB, Gale RJ, Alshawabkeh AN, Marks RE, Puppala S, Bricka M, Parker R (1995) Electrokinetic remediation: basics and technology status. J Hazard Mater 40(2):117–137. https://doi.org/10.1016/0304-3894(94)00066-P
Alloway BJ (2013) Sources of heavy metals and metalloids in soils. In: Alloway BJ (ed) Heavy metals in soils. Springer, Dordrecht, pp 11–50
Cameselle C, Pena A (2016) Enhanced electromigration and electro-osmosis for the remediation of an agricultural soil contaminated with multiple heavy metals. Process Saf Environ 104:209–217. https://doi.org/10.1016/j.psep.2016.09.002
Cappai G, Gioannis GD, Muntoni A, Spiga D, Zijlstra JJP (2012) Combined use of a transformed red mud reactive barrier and electrokinetics for remediation of Cr/As contaminated soil. Chemosphere 86(4):400–408. https://doi.org/10.1016/j.chemosphere.2011.10.053
Cappuyns V, Swennen R, Verhulst J (2004) Assessment of acid neutralizing capacity and potential mobilisation of trace metals from land-disposed dredged sediments. J Sci Total Environ 333(1-3):233–247. https://doi.org/10.1016/j.scitotenv.2004.05.007
Chung HI (2009) Field applications on electrokinetic reactive pile technology for removal of Cu from in-situ and excavated soils. Sep Sci Technol 44(10):2341–2353. https://doi.org/10.1080/01496390902983687
Derakhshan NZ, Jung MC, Kim KH (2017) Remediation of soils contaminated with heavy metals with an emphasis on immobilization technology. Environ Geochem Health. https://doi.org/10.1007/s10653-017-9964-z
Fu R, Wen D, Xia X, Zhang W, Gu Y (2017) Electrokinetic remediation of chromium (Cr)-contaminated soil with citric acid (CA) and polyaspartic acid (PASP) as electrolytes. Chem Eng J 316:601–608. https://doi.org/10.1016/j.cej.2017.01.092
Khalid S, Shahid M, Niazi NK, Murtaza B, Bibi I, Dumat C (2017) A comparison of technologies for remediation of heavy metal contaminated soils. J Geochem Explor 182(part B):247–268
Kim W-S, Jeon E-K, Jung J-M, Jung H-B, Ko S-H, Seo C-I, Baek K (2014) Field application of electrokinetic remediation for multi-metal contaminated paddy soil using two-dimensional electrode configuration. Environ Sci Pol 21(6):4482–4491. https://doi.org/10.1007/s11356-013-2424-0
Li G, Guo S, Li S, Zhang L, Wang S (2012) Comparison of approaching and fixed anodes for avoiding the ‘focusing’ effect during electrokinetic remediation of chromium-contaminated soil. Chem Eng J 203:231–238. https://doi.org/10.1016/j.cej.2012.07.008
Li Z, Ma Z, van der Kuijp TJ, Yuan Z, Huang L (2014a) A review of soil metals metal pollution from mines in China: pollution and health risk assessment. Sci Total Environ 468:843–853
Li D, Tan XY, XD W, Pan C, Xu P (2014b) Effects of electrolyte characteristics on soil conductivity and current in electrokinetic remediation of lead-contaminated soil. Sep Purif Technol 135:14–21. https://doi.org/10.1016/j.seppur.2014.07.048
Li YJ, Hu PJ, Zhao J, Dong CX (2015) Remediation of cadmium-and lead-contaminated agricultural soil by composite washing with chlorides and citric acid. Environ Sci Pol 22(7):5563–5571. https://doi.org/10.1007/s11356-014-3720-z
Liu X, Tian G, Jiang D, Zhang C, Kong L (2016) Cadmium (Cd) distribution and contamination in Chinese paddy soils on national scale. Environ Sci Pollut Res 23(18):17941–17952. https://doi.org/10.1007/s11356-016-6968-7
Luo XS, Yu S, Li XD (2012) The mobility, bioavailability, and human bioaccessibility of trace metals in urban soils of Hong Kong. Appl Geochem 27(5):995–1004. https://doi.org/10.1016/j.apgeochem.2011.07.001
Makino T, Takano H, Kamiya T, Itou T, Sekiya N, Inahara M, Sakurai Y (2008) Restoration of cadmium-contaminated paddy soils by washing with ferric chloride: Cd extraction mechanism and bench-scale verification. Chemosphere 70(6):1035–1043. https://doi.org/10.1016/j.chemosphere.2007.07.080
Meharg AA, Norton G, Deacon C, Williams P, Adomako EE, Price A, Villada A (2013) Variation in rice cadmium related to human exposure. Environ Sci Technol 47(11):5613–5618. https://doi.org/10.1021/es400521h
Meng Q, Zhang Y, Dong P (2017) Desorption of mercury from contaminated soil using sodium sulfite. Water Air Soil Poll 228:27
Paramkusam BR, Srivastava RK, Mohan D (2015) Electrokinetic removal of mixed heavy metals from a contaminated low permeable soil by surfactant and chelants. Environ Earth Sci 73(3):1191–1204. https://doi.org/10.1007/s12665-014-3474-4
Peng JF, Song YH, Yuan P, Cui XY, Qiu GL (2009) The remediation of heavy metals contaminated sediment. J Hazard Mater 161(2-3):633–640. https://doi.org/10.1016/j.jhazmat.2008.04.061
Reddy KR, Chinthamreddy S (2004) Enhanced electrokinetic remediation of heavy metals in glacial till soils using different electrolyte solutions. J Environ Eng 130(4):442–455. https://doi.org/10.1061/(ASCE)0733-9372(2004)130:4(442)
Reddy KR, Maturi K, Cameselle C (2009) Sequential electrokinetic remediation of mixed contaminants in low permeability soils. J Environ Eng ASCE 135(10):989–998. https://doi.org/10.1061/(ASCE)EE.1943-7870.0000077
Rosestolato D, Bagatin R, Ferro S (2015) Electrokinetic remediation of soils polluted by heavy metals (mercury in particular). Chem Eng J 264:16–23. https://doi.org/10.1016/j.cej.2014.11.074
Sapountzi FM, Gracia JM, Fredriksson HO, Niemantsverdriet JH (2017) Electrocatalysts for the generation of hydrogen, oxygen and synthesis gas. Prog Energ Combust Sci 58:1–35. https://doi.org/10.1016/j.pecs.2016.09.001
Savari S, Sachdeva S, Kumar A (2008) Electrolysis of sodium chloride using composite poly(styrene-co-divinylbenzene) cation exchange membranes. J Membr Sci 310(1-2):246–261. https://doi.org/10.1016/j.memsci.2007.10.049
Scialdone O, Randazzo S, Galia A, Silvestri G (2009) Electrochemical oxidation of organics in water: role of operative parameters in the absence and in the presence of NaCl. Water Res 43(8):2260–2272. https://doi.org/10.1016/j.watres.2009.02.014
Song Y, Ammami MT, Benamar A, Mezazigh S, Wang H (2016) Effect of EDTA, EDDS, NTA and citric acid on electrokinetic remediation of As, Cd, Cr, Cu, Ni, Pb and Zn contaminated dredged marine sediment. Environ Sci Pollut Res 23(11):10577–10586. https://doi.org/10.1007/s11356-015-5966-5
Su C, Jiang L, Zhang W (2014) A review on metals metal contamination in the soil worldwide: situation, impact and remediation techniques. Environ Skep Cri 3:24
Vincent I, Bessarabov D (2018) Low cost hydrogen production by anion exchange membrane electrolysis: a review. Renew Sust Energ Rev 81(part 3):1690–1704
Vocciante M, Bagatin R, Ferro S (2016) Enhancements in electrokinetic remediation technology: focus on water management and wastewater recovery. Chem Eng J 309:708–716
Xu S, Guo S, Wu B, Li F, Li T (2014) An assessment of the effectiveness and impact of electrokinetic remediation for pyrene-contaminated soil. J Environ Sci China 26(11):2290–2297. https://doi.org/10.1016/j.jes.2014.09.014
Yuan S, Xi Z, Jiang Y, Wan J, Wu C, Zheng Z, Lu X (2007) Desorption of copper and cadmium from soils enhanced by organic acids. Chemosphere 68(7):1289–1297. https://doi.org/10.1016/j.chemosphere.2007.01.046
Yuan L, Xu X, Li H, Wang N, Guo N, Yu H (2016) Development of novel assisting agents for the electrokinetic remediation of metals metal-contaminated kaolin. Electrochim Acta 218:140–148. https://doi.org/10.1016/j.electacta.2016.09.121
Zhang P, Jin C, Sun Z, Huang G, She Z (2016) Assessment of acid enhancement schemes for electrokinetic remediation of Cd/Pb contaminated soil. Water Air Soil Pollut 227(6):217. https://doi.org/10.1007/s11270-016-2879-y
Zhou D-M, Deng C-F, Cang L (2004) Electrokinetic remediation of a Cu contaminated red soil by conditioning catholyte pH with different enhancing chemical reagents. Chemosphere 56(3):265–273. https://doi.org/10.1016/j.chemosphere.2004.02.033
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Zhang, Y., Chu, G., Dong, P. et al. Enhanced electrokinetic remediation of lead- and cadmium-contaminated paddy soil by composite electrolyte of sodium chloride and citric acid. J Soils Sediments 18, 1915–1924 (2018). https://doi.org/10.1007/s11368-017-1890-2
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DOI: https://doi.org/10.1007/s11368-017-1890-2