Enhanced bioremediation of PAH-contaminated soil by immobilized bacteria with plant residue and biochar as carriers

Chen, Baoliang; Yuan, Miaoxin; Qian, Linbo

doi:10.1007/s11368-012-0554-5

Cited by 191 publications

(56 citation statements)

References 29 publications

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“…In recent years, biochar became a product of interest for carbon sequestration, as a soil amendment for crop yield improvement, and for bioremediation [1] [2]. Several properties of biochar suggest suitability as an inoculant carrier and seed-coating material.…”

Section: Introductionmentioning

confidence: 99%

Biochar Based Inoculants Improve Soybean Growth and Nodulation

Głodowska¹,

Schwinghamer²,

Husk³

et al. 2017

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Most rhizobial inoculants that stimulate legume yield are applied with carriers that enhance root contact. The physicochemical properties of biochar are suitable for microbial growth, and it could be an alternative to peat, which comes from decreasing reserves but is the commonest solid inoculant carrier. The aim of the current research was to evaluate biochars as carriers of bradyrhizobia in solid inoculant and as coatings for seeds. Biochars and peat were inoculated with Bradyrhizobium japonicum strain 532C and storage time was assessed. A seed coating system was developed using biochar, bacteria liquid culture, water, and guar gum. The viability of bacteria in the coating and in solid biochar was evaluated at 4˚C and 21˚C. Two biochars were selected for a germination assay. Finally, greenhouse experimentation investigated the effect of biochar inoculant and seed coating on soybean growth and nutrient uptake. The storage time experiment showed that not all biochars equally sustain bacteria survival over time. The germination assay demonstrated that biochar seed coating had no effect on soybean germination. Greenhouse experimentation indicated that the effect of Pyrovac biochar on soybean growth characteristics and nutrient uptake depended on the fertilizer. The main finding was that biochar solid inoculant positively affected plant growth metrics, root characteristics, and the chemical composition of plants supplied with N-free nutrient solution.

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Section: Introductionmentioning

confidence: 99%

Biochar Based Inoculants Improve Soybean Growth and Nodulation

Głodowska¹,

Schwinghamer²,

Husk³

et al. 2017

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“…Biochar is a carbon-rich material produced during the pyrolysis of biomass, and its application as in situ heavy metal immobilization has received considerable interests in recent years (Chen and Yuan 2011;Chen et al 2012;Downie et al 2012;Fang et al 2014;Lehmann 2007;Woolf et al 2010;Xu and Chen 2015). Biochar was shown to be a promising amendment agent for the immobilization of heavy metal, and both inorganic matter (such as P and Si) and organic functional groups in biochars affected the immobilization and bioavailability of heavy metal (Angelo et al 2014;Cao et al 2009a;Luo et al 2014;Uchimiya et al 2012a;Zhang et al 2013a;Xu and Chen 2015).…”

Section: Introductionmentioning

confidence: 99%

Competitive adsorption of cadmium and aluminum onto fresh and oxidized biochars during aging processes

2015

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Purpose Fresh biochar was shown to effectively reduce concentrations of heavy metal in soil, but the influences of the aging processes of biochar and competitions from other elements are warranted to precisely evaluate the long-term effect of biochar. This work investigated the effects of water washing, oxidation, and coexistence of aluminum (Al) on cadmium (Cd) adsorption by biochars and oxidized biochars. Materials and methods The Cd adsorption and the competitive adsorption of Cd and Al to rice straw-derived biochars, before and after oxidation by HNO 3 /H 2 SO 4 , were investigated. Meanwhile, the structural characteristics and surface charges of primary and oxidized biochars, with and without Cd loading, were analyzed by scanning electron microscopy, fourier-transform infrared spectroscopy, and zeta potential. Results and discussion The adsorption of Cd onto fresh biochars was dominated by surface complexation of oxygencontaining functional groups via esterification reactions, which was regulated by solution pH. Oxidization (aging) introduced carboxylic functional groups to biochar surfaces, which served as additional binding sites for Cd. The Cd binding to biochars was significantly affected by the coexistence of Al via acidification and competition for adsorption sites. Conclusions The biochars exhibited high sorption capacities of Cd in soil, but soil acidification led to a counteractive of biochar's liming effect and a reduction of Cd-binding sites; thus, the long-term effect of biochar for heavy metal immobilization should be paid more attention in acidic soil.

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“…Therefore, the increasing cost and limiting efficacy of these out-of-date methods have impelled the progress of innovative and substitute expertise for in situ remediation of contaminated lands, particularly based on biological approaches. On-site operation of biological technology is less expensive and causes minimal site disruption, therefore, it has greater public acceptance (Afzal et al, , 2012Chen et al, 2012;Burghal et al, 2015;Athar et al, 2016).…”

Section: Biological Methodsmentioning

confidence: 99%