Enhanced anaerobic digestion with the addition of chelator-nickel complexes to improve nickel bioavailability

Zhang, Mei; Fan, Zijing; Hu, Zhongda; Luo, Xingzhang

doi:10.1016/j.scitotenv.2020.143458

Cited by 17 publications

(5 citation statements)

References 47 publications

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“…In this study, the improved BCR continuous extraction method was used to extract the heavy metal speciation from the surface soil samples around Qinghai Lake. See the references for the experimental process [43][44]. Finally, the measured values of various forms of heavy metal elements in the soil were calculated, and the recovery rate was 100% ±20%, indicating that the results of the speciation extraction in this study were reliable.…”

Section: Extraction and Analysis Of Heavy Metal Speciation In Samplesmentioning

confidence: 65%

Ecological Risk Assessment of Heavy Metals in Surface Soil of Qinghai Lake Area Based on Occurrence Forms

Wang

Shao

Wei

et al. 2021

Preprint

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In this paper, the content and speciation of Cd, Cr, Pb, As, Cu, Zn and Ni in 87 groups of soil samples collected by grid method were determined by Inductively Coupled Plasma-Atomic Emission Spectrometry, to explore the speciation characteristics and ecological risk status of heavy metals in surface soil around Qinghai Lake. The results show that: Cd and Pb, compared with Cr, As, Cu, Zn and Ni, in the surface soil around Qinghai Lake are the most seriously polluted, Heavy metal speciation analysis showed that the proportion of weak acid soluble components of Cd was relatively high, with strong mobility and high environmental risk. The reducible components of Zn and Pb account for a relatively high proportion, while the oxidizable components of Cu, Cd and Pb account for a relatively high proportion. The high percentage of residual Cr, Ni and As indicates that they are relatively stable. The extractable content of Cd, Pb and Zn is relatively high, and their activities are strong, which have a great impact on the food chain. The results of Inductively Coupled Plasma-Atomic Emission Spectrometry and the ratio of secondary phase and primary phase showed that Cd and Pb had more serious ecological risk than other heavy metals. According to the results of soil speciation and ecological risk assessment of heavy metals around Chinese and foreign lakes, although the speciation characteristics of heavy metals are different, the pollution of Cd is relatively large. To sum up, heavy metal pollution in soil around Qinghai Lake area has occurred, and there is a serious ecological risk, so it is urgent to take corresponding monitoring and formulate treatment plan.

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Section: Extraction and Analysis Of Heavy Metal Speciation In Samplesmentioning

confidence: 65%

Ecological Risk Assessment of Heavy Metals in Surface Soil of Qinghai Lake Area Based on Occurrence Forms

Wang

Shao

Wei

et al. 2021

Preprint

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“…The research offers insights into how the chosen inocula may mitigate these challenges, potentially advancing more effective and sustainable waste treatment. Nickel emerges as a pivotal trace element in the anaerobic digestion process [21]. The study underscores nickel's enduring impact on biogas and biomethane content, playing a vital role in the recovery of the R-2 CSTR reactor by modifying the addition of poultry B substrate.…”

Section: Discussionmentioning

confidence: 94%

Biogas Dynamics and Microbial Composition Employing Different Inocula and Substrates in Continuous Stirred-Tank Reactors

Shah,

Mackie,

Mahmood

2024

Microbiology Research

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The current investigation delved into the utilization of cattle and municipal sanitary inocula for anaerobic digestion of poultry wastes, addressing a crucial and pragmatic challenge in waste management. The emphasis on poultry waste is pertinent due to its well-documented impediments in anaerobic digestion, attributed to heightened levels of ammonia and volatile fatty acids (VFAs). The strategic selection of cattle and municipal sanitary inocula suggests an approach aimed at bolstering the anaerobic digestion process. In this study, we evaluated the use of cattle and municipal sanitary inocula for the anaerobic digestion of various poultry wastes, which is often challenged by high levels of ammonia and volatile fatty acids (VFAs). The substrates tested included belt waste (Poultry A), poultry litter plus feed residues (Poultry B), tray hatchery ©, and stillage. These substrates were processed in two continuous stirred tank reactors (CSTRs), R-1 (with antibiotic monensin) and R-2 (without monensin). Initially, both reactors operated with the same hydraulic retention time (HRT), using a substrate ratio of stillage: belt: tray hatchery (S:B:T) of 70:15:15. On the 41st day, the HRT was adjusted to 20 days, and the substrate ratio was changed to S:A:T 70:40:40. The specific methane yield for R-1 started at 10.768 L g−1 COD, but decreased to 2.65 L g−1 COD by the end of the experiment. For R-2, the specific methane yield varied between 0.45 L g−1 COD and 0.243 L g−1 COD. Microbial composition in the reactors changed over time. In R-1, bacteroides were consistently dominant, while firmicutes were less abundant compared to R-2. Proteobacteria were initially low in abundance, but spirochetes were found in both reactors throughout the experiment. The study concluded that Poultry B substrates, due to their rich nutrient and trace element composition, are suitable for biogas plants. Municipal sanitary inocula also showed promise due to their resilience in high ammonia concentrations. Further research into biofilm interactions is recommended to better understand microbial responses to high ammonia concentrations, which can lead to propionate production in anaerobic digestion (AD).

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“…Coenzyme F420, an electron carrier, occurs in various methanogenic archaea and is mainly involved in methane synthesis in the methanogenic stage; therefore, it can be used as an index of AD process efficiency. Thus, methane production was positively correlated with the coenzyme F420 concentration; the higher the activity of coenzyme F420, the higher the rate of methane production, i.e., the higher the AD process efficiency [62].…”

Section: Enzyme Activitymentioning

confidence: 96%

Effects of Increasing Concentrations of Enrofloxacin on Co-Digestion of Pig Manure and Corn Straw

et al. 2022

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Enrofloxacin (ENR) is one of the most commonly used antibiotics in pig farms. In this study, using fresh pig manure and corn straw powder as substrates, the effects of different concentrations of ENR (2.5, 10, and 20 mg/L) on anaerobic digestion in completely mixed anaerobic reactors were investigated. A relatively low concentration of ENR (2.5 mg/L) increased methane production by 47.58% compared with the control group. Among the volatile fatty acids (VFAs) in the reactors, the propionic acid content was the lowest, and the concentrations of acetic acid kinase and coenzyme F420 were highest in the first seven days during peak gas production. However, methane production in the reactors with 10 mg/L and 20 mg/L ENR decreased by 8.59% and 20.25%, respectively. Furthermore, the accelerated hydrolysis of extracellular polymeric substances causes a significant accumulation of VFA levels. The microbial community in anaerobic reactors was analyzed by 16S rRNA sequencing. Proteiniphilum was the dominant bacterial genus. In addition, ENR at 2.5 mg/L effectively increased the abundance and diversity of anaerobic microorganisms, whereas a high concentration of ENR (10 and 20 mg/L) significantly decreased these parameters. This study demonstrated that different concentrations of ENR had significantly different effects on anaerobic digestion.

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Enhanced anaerobic digestion with the addition of chelator-nickel complexes to improve nickel bioavailability

Cited by 17 publications

References 47 publications

Ecological Risk Assessment of Heavy Metals in Surface Soil of Qinghai Lake Area Based on Occurrence Forms

Ecological Risk Assessment of Heavy Metals in Surface Soil of Qinghai Lake Area Based on Occurrence Forms

Biogas Dynamics and Microbial Composition Employing Different Inocula and Substrates in Continuous Stirred-Tank Reactors

Effects of Increasing Concentrations of Enrofloxacin on Co-Digestion of Pig Manure and Corn Straw

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