Sediment metals adhering to biochar enhanced phosphorus adsorption in sediment capping

Cheng, Gao; Fan, Jizhuang; Zhang, Xujie; Gong, Zhiwei; Tan, Zhenyu

doi:10.2166/wst.2021.411

Cited by 15 publications

(5 citation statements)

References 37 publications

(45 reference statements)

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“…However, C–O, with a larger peak area, still dominated the fitting. Figure 2 d shows that Zn 2p can be deconvoluted into two parts, Zn 2p 1/2 (1045.5 eV) and Zn 2p 3/2 (1022.4 eV) [ 22 ]. This was similar to the binding energy of conventional Zn-X-LDX/LDO previously reported (where X represents other metals) [ 23 , 24 ].…”

Section: Resultsmentioning

confidence: 99%

Nano-Zero-Valent Zinc-Modified Municipal Sludge Biochar for Phosphorus Removal

Zhang

et al. 2023

Molecules

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Municipal sludge biochar (MSBC) can be used to absorb phosphorus in water for waste treatment. Nano-zero-valent zinc (nZVZ) was uniformly attached to MSBC to obtain a highly efficient phosphorus-absorbing composite material, nZVZ–MSBC. Characterization by FTIR, XPS, XRD, and BET showed that nZVZ was uniformly dispersed on the surface of the MSBC. Zinc loading was able to greatly improve the adsorption performance of MSBC for phosphorus. Adsorption experiments illustrated that the adsorption process conformed to the Langmuir model, and the maximum adsorption amount was 186.5 mg/g, which is much higher than that for other municipal sludge biochars. The adsorption process reached 80% of the maximum adsorption capacity at 90 min, and this gradually stabilized after 240 min; adsorption equilibrium was reached within 24 h. The optimum pH for adsorption was 5. The main adsorption mechanism was chemical adsorption, but physical adsorption, external diffusion, internal diffusion, and surface adsorption also played roles. The potential for application as an efficient adsorbent of phosphorus from water was confirmed. In addition, a novel strategy for municipal sludge disposal and resource utilization is provided.

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Section: Resultsmentioning

confidence: 99%

Nano-Zero-Valent Zinc-Modified Municipal Sludge Biochar for Phosphorus Removal

Zhang

et al. 2023

Molecules

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“…The maximum phosphate adsorption capacity of the biochar prepared by Cheng et al [12] . was only 2.32 mg/g at different pyrolysis temperatures, whereas that of the peanut shell biochar prepared by Gao et al [13] . was only 0.48 mg/g.…”

Section: Introductionmentioning

confidence: 88%

“…However, biochar carries many oxygencontaining active groups on its surface, is negatively charged, and electrostatic reactions limit its phosphate adsorption. [10,11] The maximum phosphate adsorption capacity of the biochar prepared by Cheng et al [12] was only 2.32 mg/g at different pyrolysis temperatures, whereas that of the peanut shell biochar prepared by Gao et al [13] was only 0.48 mg/g. Physicochemical modification of biochar is usually required to improve its phosphate adsorption capacity.…”

Section: Introductionmentioning

confidence: 99%

Effect of Modified Biochar Prepared by Co‐pyrolysis of MgO on Phosphate Adsorption Performance and Seed Germination

Tu,

Zhang,

Cen

et al. 2023

ChemPlusChem

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Biochar is currently used as a phosphate adsorbent in water and subsequently as a soil amendment. In this study, modified biochar was prepared directly by co‐pyrolysis of MgO and rice straw, and a preliminary ecotoxicological assessment was performed before the application of modified biochar to soil. The effects of single factors, such as pyrolysis temperature, dosage, pH, and coexisting ions, on phosphate adsorption performance were investigated. In addition, after phosphate adsorption, the effects of modified biochar leachate on the germination of corn and rice seeds were examined. The results showed that phosphate adsorption by the modified biochar first increased and then decreased as the pyrolysis temperature increased, with modified biochar prepared at 800 °C showing the greatest adsorption. In addition, a comprehensive cost analysis showed that the best phosphate adsorption effect of modified biochar was achieved at a dosage of 0.10 g and a solution pH of 3. In contrast, the presence of competitive coexisting ions, Cl−, NO3−, CO32−, and SO42−, reduced the phosphate adsorption capacity of the modified biochar. The adsorption kinetics results revealed that the process of phosphate adsorption by the modified biochar was more in line with the pseudo‐second‐order model and dominated by chemisorption. Moreover, the adsorption isotherm results indicated that the process was more in line with the Langmuir model and dominated by monomolecular layer adsorption, with a maximum adsorption of 217.54 mg/g. Subsequent seed germination tests showed that phosphate‐adsorbed modified biochar leachate had no significant effect on the germination rate of corn seeds, whereas it improved the germination rate of rice seeds. Together, these results provide guidance for the application of modified biochar firstly as an adsorbent of phosphate and subsequently as a soil remediator.

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“…FPS are abundant in nutrients and trace elements and can potentially serve as beneficial fertilizers for promoting crop growth ( Al-Solaimani et al., 2022 ). Although it has been widely researched how nutrients may build up in sediments ( Schmadel et al., 2019 ; Becker and Silbiger, 2020 ; Huang et al., 2022 ), the collected sediments are unsuitable for direct application due to the preservation of metal contents on their particle surfaces ( Gao et al., 2021 ). To ensure the safe usage of FPS as fertilizers in agricultural soils, sediments must be converted into environment friendly source of fertilizer ( Yan et al., 2018 ).…”

Section: Introductionmentioning

confidence: 99%

Exploring biochar and fishpond sediments potential to change soil phosphorus fractions and availability

Mahmood,

Wang,

Ahmed

et al. 2023

Front. Plant Sci.

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Phosphorus (P) availability in soil is paradoxical, with a significant portion of applied P accumulating in the soil, potentially affecting plant production. The impact of biochar (BR) and fishpond sediments (FPS) as fertilizers on P fixation remains unclear. This study aimed to determine the optimal ratio of BR, modified biochar (MBR), and FPS as fertilizer replacements. A pot experiment with maize evaluated the transformation of P into inorganic (Pi) and organic (Po) fractions and their contribution to P uptake. Different percentages of FPS, BR, and MBR were applied as treatments (T1–T7), T1 [(0.0)], T2 [FPS (25.0%)], T3 [FPS (25.0%) + BR (1%)], T [FPS (25%) +MBR (3%)], T5 [FPS (35%)], T6 [FPS (35%) +BR (1%)], and T7 [FPS (35%) + MBR (1%)]. Using the modified Hedley method and the Tiessen and Moir fractionation scheme, P fractions were determined. Results showed that various rates of MBR, BR, and FPS significantly increased labile and moderately labile P fractions (NaHCO3-Pi, NaHCO3-Po, HClD-Pi, and HClC-Pi) and residual P fractions compared with the control (T1). Positive correlations were observed between P uptake, phosphatase enzyme activity, and NaHCO3-Pi. Maximum P uptake and phosphatase activity were observed in T6 and T7 treatments. The addition of BR, MBR, and FPS increased Po fractions. Unlike the decline in NaOH-Po fraction, NaHCO3-Po and HClc-Po fractions increased. All Pi fractions, particularly apatite (HClD-Pi), increased across the T1–T7 treatments. HClD-Pi was the largest contributor to total P (40.7%) and can convert into accessible P over time. The T5 treatment showed a 0.88% rise in residual P. HClD-Pi and residual P fractions positively correlated with P uptake, phosphatase activity, NaOH-Pi, and NaOH-Po moderately available fractions. Regression analysis revealed that higher concentrations of metals such as Ca, Zn, and Cr significantly decreased labile organic and inorganic P fractions (NaHCO3-Pi, R2 = 0.13, 0.36, 0.09) and their availability (NaHCO3-Po, R2 = 0.01, 0.03, 0.25). Excessive solo BR amendments did not consistently increase P availability, but optimal simple and MBR increased residual P contents in moderately labile and labile forms (including NaOH-Pi, NaHCO3-Pi, and HClD-Pi). Overall, our findings suggest that the co-addition of BR and FPS can enhance soil P availability via increasing the activity of phosphatase enzyme, thereby enhancing plant P uptake and use efficiency, which eventually maintains the provision of ecosystem functions and services.

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Sediment metals adhering to biochar enhanced phosphorus adsorption in sediment capping

Cited by 15 publications

References 37 publications

Nano-Zero-Valent Zinc-Modified Municipal Sludge Biochar for Phosphorus Removal

Nano-Zero-Valent Zinc-Modified Municipal Sludge Biochar for Phosphorus Removal

Effect of Modified Biochar Prepared by Co‐pyrolysis of MgO on Phosphate Adsorption Performance and Seed Germination

Exploring biochar and fishpond sediments potential to change soil phosphorus fractions and availability

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