Application of γ-PGA as the primary carbon source to bioremediate a TCE-polluted aquifer: A pilot-scale study

Luo, S.G.; Chen, S.C.; Cao, Wenzhi; Lin, Wei; Sheu, Yih-Terng; Kao, Chih‐Ming

doi:10.1016/j.chemosphere.2019.124449

Cited by 18 publications

(11 citation statements)

References 54 publications

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“…The viscosity of ECO was measured using a Brookfield DV3TLVCJ0 Cone/plate Rheometer (Brookfield Ametek Inc., USA) (Mikkola, 2012; Mikkola, 2015). The homogeneity experiment was conducted by centrifugation (5000 rpm for 5 min) followed by a static settlement for 110 days (Luo et al, 2019). The delamination and homogeneity of the emulsion was tested after the experiment following the procedures in Dong et al (2019).…”

Section: Methodsmentioning

confidence: 99%

“…The delamination and homogeneity of the emulsion was tested after the experiment following the procedures in Dong et al (2019). The procedures for the determination of viscosity, globule droplet distribution, particle size, surface structure, and zeta potential are described in Luo et al (2019), Esfe et al (2018), and Sheu et al (2018).…”

Section: Methodsmentioning

confidence: 99%

“…Researchers reported that pH value was one of the important factors affecting the reductive dechlorinating processes of TCE (Lin et al, 2020; Luo et al, 2019; Yang, Cápiro, Yan, et al, 2017). During the field‐scale anaerobic TCE bioremediation, primary substrates or carbon sources (e.g., cane molasses, emulsified substrates, and vegetable oils) were introduced into the subsurface to serve as electron donors for reductive dechlorination.…”

Section: Introductionmentioning

confidence: 99%

“…Remediation of the TCE sites is a lengthy process due to the possible occurrence of sorbed TCE residual, which forms a source of TCE contamination (Brusseau, 2019;Haluska et al, 2019). The passive and in situ anaerobic dechlorination system (e.g., in situ biostimulation system to enhance reductive dechlorination of TCE) has been widely applied for the cleanup of TCE-polluted groundwater sites due to its effectiveness and low cost for a long-term site remediation (Luo et al, 2019;Qiu et al, 2021;Sheu et al, 2016). For the reductive dechlorination, hydrogen (H 2 ) and TCE are used as the electron donor and acceptor, respectively (Hao et al, 2021;Schiefler et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Bioremediation of trichloroethylene‐polluted groundwater using emulsified castor oil for slow carbon release and acidification control

Chen

Surmpalli

et al. 2021

Water Environment Research

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In this study, the emulsified castor oil (ECO) substrate was developed for a long‐term supplement of biodegradable carbon with pH buffering capacity to anaerobically bioremediate trichloroethylene (TCE)‐polluted groundwater. The ECO was produced by mixing castor oil, surfactants (sapindales and soya lecithin [SL]), vitamin complex, and a citrate/sodium phosphate dibasic buffer system together for slow carbon release. Results of the emulsification experiments and microcosm tests indicate that ECO emulsion had uniform small droplets (diameter = 539 nm) with stable oil‐in‐water characteristics. ECO had a long‐lasting, dispersive, negative zeta potential (−13 mv), and biodegradable properties (viscosity = 357 cp). Approximately 97% of TCE could be removed with ECO supplement after a 95‐day operational period without the accumulation of TCE dechlorination byproducts (dichloroethylene and vinyl chloride). The buffer system could neutralize acidified groundwater, and citrate could be served as a primary substrate. ECO addition caused an abrupt TCE adsorption at the initial stage and the subsequent removal of adsorbed TCE. Results from the next generation sequences and real‐time polymerase chain reaction (PCR) indicate that the increased microbial communities and TCE‐degrading bacterial consortia were observed after ECO addition. ECO could be used as a pH‐control and carbon substrate to enhance anaerobic TCE biodegradation effectively. Practitioner Points Emulsified castor oil (ECO) contains castor oil, surfactants, and buffer for a slow carbon release and pH control. ECO can be a long‐term carbon source for trichloroethylene (TCE) dechlorination without causing acidification. TCE removal after ECO addition is due to adsorption and reductive dechlorination mechanisms.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Bioremediation of trichloroethylene‐polluted groundwater using emulsified castor oil for slow carbon release and acidification control

Chen

Surmpalli

et al. 2021

Water Environment Research

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“…g-PGA is used as a thickener, cryoprotectant, humectants, drug carrier, biological adhesive, heavy metal absorbent, and flocculant. It is commonly used in the food, cosmetic, and medical sectors [86,87].…”

Section: Food-grade Biopolymersmentioning

confidence: 99%

Removal and recovery of nutrients and value-added products from wastewater: technological options and practical perspective

Srivastava

Pothu

Sanchez

et al. 2021

Syst Microbiol and Biomanuf

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Wastewaters from various process industries, namely food and agricultural, sugar mill, brewery, milk, vegetable and fruit, and meat and fisheries processing industries and their wastewater effluents contain nutrients, organic matter, inorganic, heavy metals, suspended solids, and pathogens. The discharges of non-treated wastewater enter the nearby aquatic ecosystem (e.g., lakes, rivers) and are a significant concern due to the presence of different nutrients, competing ions and C containing pollutants. It causes excessive growth of algae, loss of habitat/species, and other negative impacts on human health/environment. In the present review, different treatment approaches have been discussed in utilizing these nutrients to synthesize value-added products such as biopolymer, biofuel, pigment, organic acid, or enzymes. These biopolymers can be used to prepare various food products/packaging materials. Dextran, chitosan, carrageenan, alginate, and pectin are good examples of non-food biopolymers. Besides these products, poly-β-hydroxybutyrate (PHB) synthesis from wastewater nutrients is reported as a new source of bio-nanocomposite materials/biopolymer-based coatings. In this review, the different treatment approaches are discussed, which are being used worldwide for the removal/recovery of nutrients, toxic pollutants, and the potential resource recovery of value-added products from wastewater.

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Poly‐γ‐glutamic acid improved biological nitrogen fixation, water‐nitrogen productivity, and nitrate residue in cotton/soybean intercropping

Jing,

Shi,

Liu

et al. 2023

J Sci Food Agric

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BackgroundPoly‐γ‐glutamic acid (γ‐PGA) can promote crop growth and improve soil properties efficiently. However, the optimal application rate of γ‐PGA in legume/non‐legume intercropping systems is still unclear. A potted experiment was conducted to investigate the effects of five γ‐PGA rates (0%, 0.1%, 0.2%, 0.3%, and 0.4%, represented by CK, P1, P2, P3, and P4, respectively) on biological nitrogen (N) fixation (BNF), water‐N productivity, and nitrate distribution in a cotton/soybean intercropping system.ResultsThe results showed that the growth indicators (plant height, stem diameter, leaf area index, root dry weight, root length) of cotton and soybean increased first and then decreased with increasing γ‐PGA rates, and all growth indicators of cotton and soybean showed peaks in P3 and P2 treatments. The stable 15N isotope method indicated that γ‐PGA promoted the BNF capacity of soybean and soil. In particular, the percentage of N derived from the atmosphere (Ndfa) in soybean reached 61.94% in the P2 treatment. Poly‐γ‐glutamic acid improved the water‐N productivity, and the total N partial factor productivity (NPFP) and water productivity (WP) in P3 treatment increased by 23.80% and 43.86% compared with the CK treatment. The γ‐PGA mitigation of potential nitrate residue also decreased first and then increased with increasing γ‐PGA rates.ConclusionMultivariate regression analysis showed that 0.22% of the optimal γ‐PGA application rate could obtain a higher yield and water‐N productivity in cotton/soybean intercropping system simultaneously. © 2023 Society of Chemical Industry.

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Application of γ-PGA as the primary carbon source to bioremediate a TCE-polluted aquifer: A pilot-scale study

Cited by 18 publications

References 54 publications

Bioremediation of trichloroethylene‐polluted groundwater using emulsified castor oil for slow carbon release and acidification control

Bioremediation of trichloroethylene‐polluted groundwater using emulsified castor oil for slow carbon release and acidification control

Removal and recovery of nutrients and value-added products from wastewater: technological options and practical perspective

Poly‐γ‐glutamic acid improved biological nitrogen fixation, water‐nitrogen productivity, and nitrate residue in cotton/soybean intercropping

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