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Journal ArticleDOI: 10.1016/J.BIORTECH.2021.124923

Heavy metals passivation driven by the interaction of organic fractions and functional bacteria during biochar/montmorillonite-amended composting.

02 Mar 2021-Bioresource Technology (Elsevier)-Vol. 329, pp 124923-124923
Abstract: The aim of this study was to identify critical driving factors and pathways of mitigating heavy metals (HM) bioavailability during biochar/montmorillonite-amended composting: emphasize on the interaction effect between organic constituents and functional bacteria. Organic components, such as humus (HS), humic (HA) and fulvic acid (FA) and dissolved organic carbon (DOC), exhibited indivisible links with Cu and Zn speciation, which confirmed their vital roles on deactivating Cu and Zn. Network analysis indicated that biochar/montmorillonite obviously increased the diversity of Cu resistant/actor and Zn actor bacteria, which aided in HM passivation. Although multiple pathways were involved in regulating Cu/Zn passivation, the interaction of bacteria and organic constituents was the most critical driving factor. Given that, promoting potential HM resistant/actor bacteria utilizing and transforming low-humification organic fractions coupling with elevating high-humification constituents were the optimal pathway. This study is helpful to practical application of biochar/montmorillonite to inactivate HM for industrial composting.

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Topics: Biochar (57%), Dissolved organic carbon (51%)
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5 results found


Journal ArticleDOI: 10.1016/J.BIORTECH.2021.125282
Huimin Liu1, Yuwen Zhou1, Shiyi Qin1, Sanjeev Kumar Awasth1  +5 moreInstitutions (2)
Abstract: The aim of this investigation was to study the effects of cow manure biochar (CMB) on the distribution of heavy metal resistant bacterial (HMRB) community succession during sheep manure (SM) composting. The experiments were conducted with six different ratio of CMB (0%(T1), 2.5%(T2), 5%(T3),7.5%(T4),10%(T5) and 12%(T6)onadryweightbasis) and 0% is used as control. The results showed that the most dominant phylum were Proteobacteria (40.89%-5.65%) and Firmicutes (0.16%-93.18%), and 7.5% CMB mixed with sheep manure for best results. Thus, significant correlation was noticed among the analyzed physicochemical factors, gaseous emission and bacterial phylum in used 7.5-10% CMB applied for SM composting. Overall, the application of biochar increased the diversity of the bacterial community and promoted the degradation of organic matter. In addition, 7.5-10% CMB applied treatments showed greater immobilization of HMRB community succession during SM composting.

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Topics: Manure (58%), Compost (56%), Cow dung (53%) ... read more

5 Citations


Journal ArticleDOI: 10.1016/J.JHAZMAT.2021.126635
Yumin Duan1, Jianfeng Yang1, Yaru Guo1, Xiaoping Wu1  +4 moreInstitutions (2)
Abstract: Present study was focus on the pollution control aspect of gaseous mitigation and heavy metal passivation as well as their associated bacterial communities driven by apple tree branch biochar (BB) during sheep manure composting. Six treatment was performed with distinct concentration of BB from 0%, 2.5%, 5%, 7.5%, 10%, and 12.5% as T1 to T6. Compared with compost without additive, biochar-based composting recorded faster thermophilic process (4thd) and longer duration (12–14d), lower gaseous emission in terms of ammonia (5.37–10.29 g), nitrous oxide (0.12–0.47 g) and methane (4.38–30.29 g). Notably highest temperature (65.3 ℃) and active thermophilic duration (14d), minimized gaseous volatilization were detected in 10%BB composting. Aspect of non-degradability and enrichment-concentration properties of heavy metals, the total copper (Cu) and zinc (Zn) were increased (from initial 12.71–17.91 to final 16.36–29.36 mg/kg and 107.39–146.58–161.48–211.91 mg/kg). In view of available diethylene triamine pentacetic acid (DTPA) extractable form, DTPA-Cu and DTPA-Zn from 4.29 to 6.57 and 31.66–39.32 mg/kg decreased to 3.75–4.82 and 23.43–40.54 mg/kg, especially the maximized passivation rate of 46.95% and 56.27% were present in 10%BB composting. Additionally, bacterial diversity of biochar-based composting was increased (1817–2310 OTUs) than control (1686 OTUs) and dominant by Firmicutes (52.75%), Bacteroidetes (28.41%) and Actinobacteriota (13.98%). Validated 10% biochar-based composting is the optimal option for effectively control environmental pollution to obtain hygienic composting.

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Topics: Compost (60%), Biochar (58%), Environmental pollution (55%) ... read more

2 Citations


Open accessJournal ArticleDOI: 10.1016/J.SCITOTENV.2021.151363
Chuanren Qi1, Yiran Zhang1, Sumeng Jia1, Rui Wang1  +4 moreInstitutions (1)
Abstract: This study investigated the effects of anaerobic digestion duration on methane yield, net energy production, and humification of compost during solid state anaerobic digestion (SSAD) and composting hybrid process for food waste treatment. Carbon flow and balance were used to evaluate organic methanation and humification inclination of carbon in the whole SSAD and aerobic composting system. Results showed that SSAD for 15 (AD-15) and 21 days (AD-21) could increase net energy production and degraded organic matter contained in the mixtures to achieve high biological stability. The cumulative net energy production between the AD-15 and AD-21 treatments was not significantly different, which was 8.3% higher than that in SSAD for 30 days (AD-30). Furthermore, digestate (AD-15 and AD-21) composting for 3 days reached maturity and absence of phytotoxic substances. Carbon fixed into humus of the AD-21 treatment (11.6%) was not significantly different from that of AD-15 (12.0%). However, the total amount of carbon fixed into compost in AD-15 was 6.6% higher than that in AD-21. Moreover, the CO2 -C loss of the AD-15 treatment (22.9%) was slightly higher than that of AD-21 (20.6%). Thus, AD-21 treatment achieved the most effective use of carbon during SSAD and composting hybrid process for food waste treatment. These results could provide valuable insights for the effective management of food waste in practice.

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Topics: Compost (63%), Anaerobic digestion (58%), Digestate (57%) ... read more

Journal ArticleDOI: 10.1016/J.BIORTECH.2021.125894
Juan Wu1, Wenjie Chen1, Zichao Zhao, Kui Zhang1  +5 moreInstitutions (1)
Abstract: Phosphate additives especially superphosphate can reduce nitrogen loss, and increase phosphorus availability in composting. This study investigated the changes of different heavy metals fractions and their relationship with bacterial community and abiotic factors during pig manure composting with adding equimolar H3PO4, H2SO4 and K2HPO4. Results showed that both acidic and alkaline labile phosphate increased the potential ecological risk of heavy metals compared to control, but K2HPO4 decreased the accumulation of exchangeable Zn and Mn by 12% and 15% than that with H3PO4 and H2SO4 addition. Network analysis showed that K2HPO4 enhanced the proportion of negative links in bacterial species with heavy metals, but H3PO4 decreased the stability of bacterial network. Redundancy analysis demonstrated that pH was the key factor on metal speciation and risk with phosphate additives than bacterial role. The study presented theoretical basis for additive selection in controlling composting nitrogen fixation and environmental risk.

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Topics: Manure (53%), Phosphate (52%), Phosphorus (51%)

Journal ArticleDOI: 10.1007/S13762-021-03581-Y
U. F. C. Sayago, Y. P. Castro1Institutions (1)
Abstract: In recent years, chromium water pollution has become a serious problem for aquatic environments as rivers and wetlands, and for human health. Many researchers are working on finding economic and efficient ways to solve this issue, with the objective of mitigating the damaging effluents of the industries, as in the case of the dumping of chromium. In this study, the removal of chromium (VI) by plant cellulose and bacterial cellulose was evaluated. An experiment was carried out with different initial concentrations of chromium, evaluating the ability to eliminate and adsorb this contaminant by means of biomass of E crassipes, bacterial cellulose, and the union of these two biomasses, determining which is the best biomass. Different design variables such as characterizations of biomasses, adsorption kinetics, adsorption capacities through Langmuir isotherms, pH influence, and desorption-adsorption capacities of each of these biomasses were evaluated. Concluding that the capacity of bacterial cellulose (BC) is 47 mg/g, the capacity between bacterial cellulose and E crassipes cellulose (EC + BC) is 28 mg/g and the cellulose of E crassipes (EC) is 10 mg/g. However, with the biomass of EC was given five processes of treatment more due to the power of elution that had the HCl about the Cr (VI) adhered in this biomass. But with the biomass of BC, the HCl had not the same result of elutions and alone had one treatment of Cr (VI).

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Topics: Bacterial cellulose (58%), Cellulose (56%), Biomass (53%)
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15 results found


Journal ArticleDOI: 10.1016/J.BIORTECH.2017.06.154
Yong Yuan1, Nanthi Bolan2, Antonin Prévoteau3, Meththika Vithanage4  +3 moreInstitutions (7)
Abstract: Biochar is chemically more reduced and reactive than the original feedstock biomass. Graphite regions, functional groups, and redox-active metals in biochar contribute to its redox characteristics. While the functional groups such as phenolic species in biochar are the main electron donating moieties (i.e., reducers), the quinones and polycondensed aromatic functional groups are the components accepting electrons (oxidants). The redox capacity of biochar depends on feedstock properties and pyrolysis conditions. This paper aims to review and summarize the various synthesis techniques for biochars and the methods for probing their redox characteristics. We review the abiotic and microbial applications of biochars as electron donors, electron acceptors, or electron shuttles for pollutant degradation, metal(loid)s (im)mobilization, nutrient transformation, and discuss the underlying mechanisms. Furthermore, knowledge gaps that exist in the exploration and differentiation of the electron transfer mechanisms involving biochars are also identified.

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Topics: Biochar (60%), Redox (52%)

199 Citations


Journal ArticleDOI: 10.1016/J.WATRES.2018.07.069
Wenxiang Zhang1, Wenxiang Zhang2, Feng Jiang1Institutions (2)
15 Jun 2019-Water Research
Abstract: The main goal of the current study was to investigate the membrane fouling mechanism of aerobic granular sludge (AGS) with various AGS sizes. In this regard, AGSs were sieved into 6 levels: 0∼0.5, 0.5∼0.7, 0.7∼1, 1∼1.2, 1.2∼1.7 mm and larger than 1.7 mm, then filtrated by a small dead-end filtration cell. Interestingly, there appeared a critical AGS size (1∼1.2 mm) for membrane fouling. Above 1.2 mm, flux increased and fouling reduced with size, due to the loose cake layer and high permeability caused by larger AGS. Below 1 mm, for smaller AGS, higher flux and lower fouling appeared, because less extracellular polymeric substance (EPS) formed and adhered onto AGS foulants. In the critical size, membrane fouling was serious to the most extent, on account of the dual role of the compact structure of cake fouling layer and the adhesion of EPS. Moreover, this critical AGS size also possessed the highest cake layer, pore blocking and irreversible fouling, which generally existed in various operational conditions. Besides, the results of SEM, AFM, hydrophilicity and ATR-FTIR also proved that the existence of the maximum membrane fouling at the critical AGS size. This study provides a deep understanding of the membrane fouling mechanisms of AGS in membrane filtration and is beneficial for developing a new membrane fouling mitigation strategy by terms of regulating AGS size.

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Topics: Membrane fouling (70%), Fouling (56%)

92 Citations


Journal ArticleDOI: 10.1016/J.JHAZMAT.2014.01.030
Abstract: Dissolved organic matter (DOM) can mediate electron transfer and change chemical speciation of heavy metals In this study, the electron transfer capability (ETC) of compost-derived DOM was investigated through electrochemical approaches, and the factors influencing the ETC were studied using spectral and elemental analysis The results showed that the electron accepting capacity (EAC) and electron donating capacity (EDC) of compost-derived DOM were 329–4014 μmol e − (g C) −1 and 571– 34607 μmol e − (g C) −1 , respectively Composting treatment increased the fulvic- and humic-like substance content, oxygenated aliphatic carbon content, lignin-derived aromatic carbon content, molecule weight, and N and S content of DOM, but decreased the aliphatic carbon content and the C and H content This conversion increased the EDC and EAC of the DOM during composting

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91 Citations


Journal ArticleDOI: 10.1016/J.BIORTECH.2019.122375
Yuquan Wei1, Yue Zhao1, Xinyu Zhao, Xintong Gao1  +3 moreInstitutions (2)
Abstract: This study aims to assess the roles of different humin and heavy-metal resistant bacterial community from composting on heavy metal removal. The results showed that the concentration of Cu2+, Zn2+, Ni2+, Pb2+, Cr3+ and Cd2+ decreased with adding the compost-derived humin, but the removal rates were relatively low ( 2”). Structural equation modeling showed that microbial biomass and humin humification are the key factors for the biosorption of heavy metals. Combining humin from maturity phase with heavy-metal resistant bacteria was suggested to control heavy metal pollution in composts.

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Topics: Humin (61%), Biosorption (51%)

58 Citations


Journal ArticleDOI: 10.1016/J.JHAZMAT.2019.121533
Jie Liang1, Siqun Tang1, Ji-Lai Gong1, Guangming Zeng1  +5 moreInstitutions (1)
Abstract: Biochar and compost, two common amendments, were rarely conducted to investigate their combined influence on enzymatic activities and microbial communities in organic-polluted wetlands. This article described the effects of biochar/compost on degradation efficiency of sulfamethoxazole (SMX) and ecosystem responses in polluted wetland soil during the whole remediation process. 1% biochar (SB1) increased degradation efficiency of SMX by 0.067% ascribed to the increase of dehydrogenase and urease. 5% biochar (SB5) decreased degradation efficiency by 0.206% due to the decrease of enzymes especially for dehydrogenase. 2% compost (SC2), 1% biochar & 2% compost (SBC3), both 10% compost (SC10) and 5% biochar & 10% compost (SBC15) enhanced degradation efficiency by 0.033%, 0.015% and 0.222%, respectively, due to the increase of enzymes and biomass. The degradation efficiency was positively related to biomass and enzymatic activities. High-throughput sequencing demonstrated that HCGs (SB5, SC10, SBC15) improved the bacterial diversities but reduced richness through introducing more exogenous predominance strains and annihilated several inferior strains, while LCGs (SB1, SC2, SBC3) exhibited lower diversities but higher richness through enhanced the RAs of autochthonal preponderant species and maintained some inferior species. Additionally, HCGs raised the RAs of amino and lipid metabolism gene but lowered those of carbohydrate compared with LCGs.

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Topics: Biochar (62%), Compost (53%)

54 Citations