The influence of variables on the bioavailability of heavy metals during the anaerobic digestion of swine manure

Zheng, Xiarong; Liu, Yuanqiong; Huang, Jiaming; Du, Zhongyi; Zhouyang, Siyu; Wang, Yuanpeng; Zheng, Yanmei; Li, Qingbiao; Shen, Xiaolong

doi:10.1016/j.ecoenv.2020.110457

Cited by 35 publications

(7 citation statements)

References 46 publications

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“…Moreover, the anaerobic digestate could be rich in aluminum, zinc and copper, which will certainly affect the microalgal culture in the subsequent process. The digestate of anaerobic digestion of swine manure contained 394.00 μg/L for zinc, 70.08 μg/L for copper, 35.87 μg/L for nickel, 0.88 μg/L for cadmium, 13.97 μg/L for arsenic and 1.06 μg/L for lead (Zheng et al 2020). Xu et al, (2019) found that the cadmium concentration in the undiluted digestate was 12.3 μg/L while the maximum accepted level of cadmium was 10 μg/L.…”

Section: Heavy Metalsmentioning

confidence: 99%

Cultivation of microalgae on liquid anaerobic digestate for depollution, biofuels and cosmetics: a review

et al. 2022

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Solid wastes from domestic, industrial and agricultural sectors cause acute economic and environmental problems. These issues can be partly solved by anaerobic digestion of wastes, yet this process is incomplete and generates abundant byproducts as digestate. Therefore, cultivating mixotrophic algae on anaerobic digestate appears as a promising solution for nutrient recovery, pollutant removal and biofuel production. Here we review mixotrophic algal cultivation on anaerobic waste digestate with focus on digestate types and characterization, issues of recycling digestate in agriculture, removal of contaminants, and production of biofuels such as biogas, bioethanol, biodiesel and dihydrogen. We also discuss applications in cosmetics and economical aspects. Mixotrophic algal cultivation completely removes ammonium, phosphorus, 17β-estradiol from diluted digestate, and removes 62% of zinc, 84% of manganese, 74% of cadmium and 99% of copper.

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Section: Heavy Metalsmentioning

confidence: 99%

Cultivation of microalgae on liquid anaerobic digestate for depollution, biofuels and cosmetics: a review

et al. 2022

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“…Ma et al [ 196 ] found an nZVI concentration of 160 mgL −1 suitable for reducing antibiotic resistance genes during AD of CM and also reported an increase in methane yield (6.43%). As per Zheng et al [ 197 ], the variations in bioavailable fractions of heavy metals (like Zn, Ni) during AD (swine manure was feed substrate) depend upon three important digestion variables, i.e., concentration of ammoniacal nitrogen <methane content in daily biogas yield <pH (arranged as per the order of importance reported in the study).…”

Section: Solutionsmentioning

confidence: 75%

Overview on agricultural potentials of biogas slurry (BGS): applications, challenges, and solutions

Kumar

Verma

Sharma

et al. 2022

Biomass Conv. Bioref.

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Graphical abstract The residual slurry obtained from the anaerobic digestion (AD) of biogas feed substrates such as livestock dung is known as BGS. BGS is a rich source of nutrients and bioactive compounds having an important role in establishing diverse microbial communities, accelerating nutrient use efficiency, and promoting overall soil and plant health management. However, challenges such as lower C/N transformation rates, ammonia volatilization, high pH, and bulkiness limit their extensive applications. Here we review the strategies of BGS valorization through microbial and organomineral amendments. Such cohesive approaches can serve dual purposes viz. green organic inputs for sustainable agriculture practices and value addition of biomass waste. The literature survey has been conducted to identify the knowledge gaps and critically analyze the latest technological interventions to upgrade the BGS for potential applications in agriculture fields. The major points are as follows: (1) Bio/nanotechnology-inspired approaches could serve as a constructive platform for integrating BGS with other organic materials to exploit microbial diversity dynamics through multi-substrate interactions. (2) Advancements in next-generation sequencing (NGS) pave an ideal pathway to study the complex microflora and translate the potential information into bioprospecting of BGS to ameliorate existing bio-fertilizer formulations. (3) Nanoparticles (NPs) have the potential to establish a link between syntrophic bacteria and methanogens through direct interspecies electron transfer and thereby contribute towards improved efficiency of AD. (4) Developments in techniques of nutrient recovery from the BGS facilities’ negative GHGs emissions and energy-efficient models for nitrogen removal. (5) Possibilities of formulating low-cost substrates for mass-multiplication of beneficial microbes, bioprospecting of such microbes to produce bioactive compounds of anti-phytopathogenic activities, and developing BGS-inspired biofertilizer formulations integrating NPs, microbial inoculants, and deoiled seed cakes have been examined.

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“…Probably because the break of EPS decreased both the VS and concentrations of Ni, Zn and Pb in acid-soluble/exchangeable fraction with the increasing treatment temperature (Figure 3). NH 4 þ -N showed the greatest correlation to the bio-availability of most heavy metals (except Cu and Cr) with the coefficients (absolute value) over 0.87 (P , 0.05), because NH 4 þ -N could combine with heavy metals or compete for active sites of the organic particle surface against heavy metals (Zheng et al 2020). Soluble polysaccharide was also well correlated with the bio-availability of Zn (À0.874, P , 0.05) and Pb (À0.831, P , 0.05).…”

Section: Correlation Analysis Of the Indexes Of Sewage Sludge And The Bio-availability Of Heavy Metalsmentioning

confidence: 99%

“…It might be that carbonates or sulfides could not be affected obviously by the change of pH (7.02-8.73) recorded in this study. However, the capture/release of cations caused by pH changes might alleviate/intensify the competition of heavy metal ions for adsorption positions on the surface of organic matter (Zheng et al 2020), thus affecting the bio-availability of Cr (with the coefficient of À0.502). Cu in bio-available fraction was barely detected in the sewage sludge, resulting in poor correlation between its bio-availability with the variables.…”

Section: Correlation Analysis Of the Indexes Of Sewage Sludge And The Bio-availability Of Heavy Metalsmentioning

confidence: 99%

Migration and transformation of heavy metals during the microwave-assisted thermal hydrolysis of sewage sludge

Qiu

Zheng

Wang

et al. 2021

Water Science and Technology

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The migration, transformation and ecological risk of heavy metals (Cr, As, Ni, Cu, Zn, Cd and Pb) in the sewage sludge during the microwave-assisted thermal hydrolysis process were investigated under different temperatures (80 °C, 100 °C, 120 °C, 140 °C, and 160 °C). The potential relationship between the bio-availability of heavy metals and the variables of microwave treatment, including pH, ammonium-nitrogen, soluble chemical oxygen demand, pH, soluble protein, soluble polysaccharide and volatile solid, was also explored. The results showed that the migration of heavy metals between solid-liquid phase mainly depended on the temperature. The percentage of all heavy metals (except Cu) in mobile (acid-soluble/exchangeable and reducible) forms decreased after microwave-assisted thermal hydrolysis treatment. The solubilization of compounds with C = O and O-H accompanied with the generation of organic and inorganic metal halides were also observed in the treated sludge through fourier transform infrared spectroscopy analysis. NH4+-N showed the highest negative correlation to the bio-availability of most heavy metals (except Cu and Cr) with coefficients (absolute value) over 0.87 (P < 0.05). VS showed a positive correlation to the bio-availability of most heavy metals (except Cu). The total potential ecological risk index (RI) decreased by 46.65% after microwave treatment at 160 °C.

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The influence of variables on the bioavailability of heavy metals during the anaerobic digestion of swine manure

Cited by 35 publications

References 46 publications

Cultivation of microalgae on liquid anaerobic digestate for depollution, biofuels and cosmetics: a review

Cultivation of microalgae on liquid anaerobic digestate for depollution, biofuels and cosmetics: a review

Overview on agricultural potentials of biogas slurry (BGS): applications, challenges, and solutions

Migration and transformation of heavy metals during the microwave-assisted thermal hydrolysis of sewage sludge

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