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1.
Bioresour Technol ; 321: 124496, 2020 Dec 03.
Artigo em Inglês | MEDLINE | ID: mdl-33302013

RESUMO

In this review investigate the apple orchard waste (AOW) is potential organic resources to produce multi-product and there sustainable interventions with biorefineries approaches to assesses the apple farm industrial bioeconomy. The thermochemical and biological processes like anaerobic digestion, composting and , etc., that generate distinctive products like bio-chemicals, biofuels, biofertilizers, animal feed and biomaterial, etc can be employed for AOW valorization. Integrating these processes can enhanced the yield and resource recovery sustainably. Thus, employing biorefinery approaches with allied different methods can link to the progression of circular bioeconomy. This review article mainly focused on the different biological processes and thermochemical that can be occupied for the production of waste to-energy and multi-bio-product in a series of reaction based on sustainability. Therefore, the biorefinery for AOW move towards identification of the serious of the reaction with each individual thermochemical and biological processes for the conversion of one-dimensional providences to circular bioeconomy.

2.
Bioresour Technol ; 320(Pt B): 124394, 2020 Nov 10.
Artigo em Inglês | MEDLINE | ID: mdl-33220545

RESUMO

Water supply around the globe is struggling to meet the rapidly increasing demand by the population, drastic changes in climate and degrading water quality. Even though, many large-scale methods are employed for wastewater treatment they display several negative impacts owing to the presence of pollutants. Technological innovation is required for integrated water management with different groups of nanomaterials for the removal of toxic metal ions, microbial disease, organic and inorganic solutes. The method of manipulating atoms on a nanoscale is nanotechnology. Nanomembranes are used in nanotechnology to soften water and eliminate physical, chemical and biological pollutants. The present review concentrates on various nanotechnological approaches in wastewater remedy, mechanisms involved to promote implementation, benefits and limitations in comparison with current processes, properties, barriers and commercialization research needs. Also the review identifies opportunities for further exploiting the exclusive features for green water management by following the advances in nanotechnology.

3.
Bioresour Technol ; 320(Pt A): 124281, 2020 Oct 19.
Artigo em Inglês | MEDLINE | ID: mdl-33099155

RESUMO

Bio-wastes from different agro-based industries are increasing at a rapid rate with the growing human population's demand for the products. The industries procure raw materials largely from agriculture, finish it with the required major product, and produce huge bio-wastes which are mostly disposed unscientifically. This creates serious environmental problems and loss of resources and nutrients. Traditional bio-wastes disposal possess several demerits which again return with negative impact over the eco-system. Anaerobic digestion, composting, co-composting, and vermicomposting are now-a-days given importance due to the improved and modified methods with enhanced transformation of bio-wastes into suitable soil amendments. The advanced and modified methods like biochar assisted composting and vermicomposting is highlighted with the updated knowledge in the field. Hence, the present study has been carried to compile the effective and efficient methods of utilizing industry generated bio-wastes for circularity between agriculture - industrial sectors to promote sustainability.

4.
Bioengineered ; 11(1): 1001-1015, 2020 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-32881650

RESUMO

Endophytic fungi and bacteria are the most ubiquitous and representative commensal members that have been studied so far in various higher plants. Within colonization and interaction with their host plants, endophytic microbiota are reportedly to modulate not only the host's growth but also holobiont resilience to abiotic and biotic stresses, providing a natural reservoir and a promising solution for sustainable agricultural development challenged by global climate change. Moreover, possessing the talent to produce a wide array of high-value natural products, plant endophytic microbiota also serve as an alternative way for novel drug discovery. In this review, tea, one of the world's three largest nonalcoholic beverages and a worldwide economic woody crop, was highlighted in the context of endophytic microbiota. We explore the recent studies regarding isolation approaches, distribution characteristics and diversity, and also biological functions of endophytic microbiota in Camellia sinensis (L.) O. Kuntze. Profoundly, the future insight into interaction mechanism between endophytic microbiota and tea plants will shed light on in-depth exploration of tea microbial resources.

5.
Bioresour Technol ; 318: 124048, 2020 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-32871319

RESUMO

This study explored the fate of Zn- resistance genes (ZRGs), antibiotic- resistance genes (ARGs) and related mechanisms associated with bacterial communities during co-composting of erythromycin manufacturing wastes (EMW) and pig manure (PM) at the ratio of 0% (control), 5% (L) and 20% (H) (PM basis). The relative abundance (RAs) of erm genes in most treatments were decreased by 77.75-99.97% after composting. But total RA of czc genes were increased by 8.34, 15.86 and 12.03 times in control, L and H treatment respectively. The higher EMW in H showed a negative impact on removing of erm genes and aggravated the enrichment of ZRGs compared with control and L. Redundancy analysis showed that Firmicutes accounted for the highest explanation of ARGs and ZRGs variations, and Zn in EMW had significant impact on the succession of bacterial community.


Assuntos
Compostagem , Animais , Antibacterianos/farmacologia , Resistência Microbiana a Medicamentos/genética , Eritromicina/farmacologia , Genes Bacterianos , Esterco , Suínos , Zinco
6.
Bioresour Technol ; 316: 123915, 2020 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-32739574

RESUMO

This study was evaluated industrial waste fine coal gasification slag (FCGS) as an additive on pig manure composting by parameters of greenhouse gases, NH3, volatile fatty acids (VFAs) and maturity. Six treatments of FCGS (0%, 2%, 4%, 6%, 8% and 10%) were added into the mixture raw material and composted 42 days. Results illustrated that the FCGS amendment could prolong sanitation stage and promote the degree of maturity, germination index and C/N ratio during composting. With the increasing amendment of FCGS, GI was increased from 9.97 to 28.45%. Compared with control, increasing of FCGS proportion could reduce the mitigation of global warming potential (N2O and CH4), NH3 and cumulative of VFAs from 8.89-77.04%, 3.81-71.65%, 5.18-28.02% and 8.79-83.33%. Finally, present study results revealed that 10%FCGS could improve composting and reduced the maturity period as well as compost quality, thus recommended as effective dosage for efficient pig manure composting.


Assuntos
Compostagem , Gases de Efeito Estufa , Animais , Carvão Mineral , Ácidos Graxos Voláteis , Esterco , Nitrogênio/análise , Solo , Suínos
7.
Bioresour Technol ; 315: 123829, 2020 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-32682258

RESUMO

In this study, the effect of biochar (BC) and bean dregs (BD) on nitrifiers and denitrifiers as well as the contributions to the NH3 and N2O emissions were investigated. Compared with the BD treatment, the maximum value of NH3 and N2O emission was decreased by 32.92% and 46.61% in the BD + BC treatment, respectively. The production of NH3 and N2O was closely associated with the abundance and structure of nitrogen functional genes. BD + BC increased the abundance of AOB amoA gene to decrease the NH3 emission. The abundance of nirS was more closely associated with N2O. The abundance of nirS in the BD + BC was lowered by 18.93% compared with the BD treatment, thereby decreasing the N2O emission after composting. Besides, the nosZ-type gene was the more functional denitrification bacterial communities to effect the N2O emissions.


Assuntos
Compostagem , Carvão Vegetal , Desnitrificação , Óxido Nitroso/análise , Solo , Microbiologia do Solo
8.
Bioresour Technol ; 313: 123609, 2020 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-32506034

RESUMO

Simultaneous denitrification and antibiotics (oxytetracycline, OTC and ciprofloxacin, CFX) degradation was evaluated using a typical aerobic denitrifying strain Marinobacter hydrocarbonoclasticus RAD-2. There was no significant influence on the aerobic nitrate removal efficiency of strain RAD-2 in the presence of these two antibiotics. Along with denitrification, the average degradation rate of 2.92 µg OTC L-1h-1 was achieved, while no degradation was observed for CFX. The growth behavior indicated that an insignificant inhibition effect could have occurred at an antibiotics dosage lower than 300 µg/L. The transcriptional results revealed that antibiotics exposure caused (<2h) down-regulation of the denitrifying related genes, but triggered a significant subsequent up-regulation (4 h). Less nitrous oxide productions were observed in both aerobic and anoxic denitrification processes with antibiotics. Overall, the hormesis effect caused by antibiotics exposure indicated a potential approach to enhance the co-metabolism degradation performance for nitrate and antibiotics in aerobic denitrification.


Assuntos
Desnitrificação , Marinobacter , Aerobiose , Antibacterianos , Nitratos , Nitrogênio
9.
Bioengineered ; 11(1): 356-374, 2020 12.
Artigo em Inglês | MEDLINE | ID: mdl-32149573

RESUMO

The study of metagenomics is an emerging field that identifies the total genetic materials in an organism along with the set of all genetic materials like deoxyribonucleic acid and ribose nucleic acid, which play a key role with the maintenance of cellular functions. The best part of this technology is that it gives more flexibility to environmental microbiologists to instantly pioneer the immense genetic variability of microbial communities. However, it is intensively complex to identify the suitable sequencing measures of any specific gene that can exclusively indicate the involvement of microbial metagenomes and be able to advance valuable results about these communities. This review provides an overview of the metagenomic advancement that has been advantageous for aggregation of more knowledge about specific genes, microbial communities and its metabolic pathways. More specific drawbacks of metagenomes technology mainly depend on sequence-based analysis. Therefore, this 'targeted based metagenomics' approach will give comprehensive knowledge about the ecological, evolutionary and functional sequence of significantly important genes that naturally exist in living beings either human, animal and microorganisms from distinctive ecosystems.

10.
Bioresour Technol ; 295: 122250, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31629281

RESUMO

Increasing nitrogenous contaminants have caused immense challenges to the environment and human health. As compared to physical and chemical methods, biological denitrification is considered to be an effective solution due to its environmental friendliness, high efficiency, and low cost. In the present work, a novel fungal strain identified as Fusarium solani (RADF-77) was isolated from cellulose material-supported denitrification reactor; this strain is capable of removing nitrogen under aerobic conditions. The average NO3--N removal rate for RADF-77 were 4.43 mg/(L·h) and 4.50 mg/(L·d), when using glucose and tea residue as carbon source, respectively. The nitrogen balance revealed that 53.66% of N vanished via gaseous products. Transcriptional results revealed that respiratory and assimilative nitrate reductases may work together for nitrate removal. Our results indicate that RADF-77 could be used as a potential means of enhancing nitrate-removal performance, as well as recycling tea residue, which is the main byproduct of the manufacture of tea extracts.


Assuntos
Desnitrificação , Fusarium , Aerobiose , Nitratos , Nitrificação , Nitrogênio
11.
Bioresour Technol ; 297: 122435, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-31780244

RESUMO

This research investigated the influence of biochar (B) and bean dregs (BD) amendments on carbon and nitrogen losses through greenhouse gas (GHG) emissions during pig manure (PM) composting. The treatments included 15% BD, 10% B and 15% BD+10% B (w/w dry basis of PM) amendments in the compost, whereas the CK (control) lacked any additives. The NH4+-N, C/N and germination index (GI) of the end products ensured compost maturity. Compared with the CK, the 15% BD amendment increased the total nitrogen content (TKN) of the final product by 8.05% but also increased NH3 (54.98%) and GHG emissions (40.35%) as well as nitrogen loss (25.62%). Furthermore, the combined treatment of 15% BD+10% B improved the TKN (2.83%) of the end product and controlled NH3 emissions (33.71%), GHG emissions (29.56%) and nitrogen loss (24.26%) while increasing CO2 only with the 15% BD amendment. Therefore, the combination of BD+B was recommended.


Assuntos
Compostagem , Gases de Efeito Estufa , Animais , Suplementos Nutricionais , Esterco , Nitrogênio , Solo , Suínos
12.
Bioengineered ; 10(1): 437-458, 2019 12.
Artigo em Inglês | MEDLINE | ID: mdl-31570035

RESUMO

Anaerobic digestion (AD) is a well-established technology used for producing biogas or biomethane alongside the slurry used as biofertilizer. However, using a variety of wastes and residuals as substrate and mixed cultures in the bioreactor makes AD as one of the most complicated biochemical processes employing hydrolytic, acidogenic, hydrogen-producing, acetate-forming bacteria as well as acetoclastic and hydrogenoclastic methanogens. Hydrogen and volatile fatty acids (VFAs) including acetic, propionic, isobutyric, butyric, isovaleric, valeric and caproic acid and other carboxylic acids such as succinic and lactic acids are formed as intermediate products. As these acids are important precursors for various industries as mixed or purified chemicals, the AD process can be bioengineered to produce VFAs alongside hydrogen and therefore biogas plants can become biorefineries. The current review paper provides the theory and means to produce and accumulate VFAs and hydrogen, inhibit their conversion to methane and to extract them as the final products. The effects of pretreatment, pH, temperature, hydraulic retention time (HRT), organic loading rate (OLR), chemical methane inhibitions, and heat shocking of the inoculum on VFAs accumulation, hydrogen production, VFAs composition, and the microbial community were discussed. Furthermore, this paper highlights the possible techniques for recovery of VFAs from the fermentation media in order to minimize product inhibition as well as to supply the carboxylates for downstream procedures.


Assuntos
Bactérias/metabolismo , Bioengenharia , Ácidos Graxos Voláteis/metabolismo , Hidrogênio/metabolismo , Metano/metabolismo , Anaerobiose , Bactérias/genética , Reatores Biológicos/microbiologia , Resíduos/análise
13.
Bioresour Technol ; 291: 121905, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31387838

RESUMO

An extensive use of microbial dynamics for utilizing the lignocellulosic wastes has been attributed to their efficiency in bioenergy and bioproducts development as a cost effective high nutritional value. The integration of lignocellulosic waste into the circular economy can scaleup the sustainable bioproducts and bioenergy development. In this review paper, the aim is to describe the existing research efforts on organic lignocellulosic waste, cellulase producing microbes, their potential enzyme, modern circular economy with associated challenges and future perspectives. Presently, it has been reviewed that microbial cellulases have provided treasure bioproducts visions into industrial bioproducts marvels unveiled through lignocellulosic waste cutting-edge microbial explorations. Furthermore, the review focused on new insights of the growing circular economy of lignocellulosic waste used for many bioproducts and bioenergy dealings and explored the emergent lignocellulosic biorefinery approaches which could then be applied to review industrial-scale sustainable economic models for upgraded bioproducts and other production associated problems.


Assuntos
Celulase , Celulases , Lignina
14.
Bioresour Technol ; 291: 121886, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31377046

RESUMO

The objective of this study was to identify the effect of clay additive to explore the nitrogen cycling related ammonification, denitrifying genes and their relation N2O and ammonia emission during the chicken manure (CM) composting. The consequences indicated that the additive clay could optimize the environment and improve the NH4+-N into NO3--N transformation. Meanwhile, the results observed that 8% clay amendment was significant correlated the abundance of nifH and nosZ genes. Compared with the other treatments, the 6% and 10% clay treatments observed low abundance of nifH. The heat map indicated that clay amendment could enhance the function genes abundance. The redundancy analysis showed that N2O and ammonia emission among all physiochemical parameters had great relationship with functional genes. Therefore, the addition of 10% clay into CM composting system could efficiently enhance the abundance of nirK and narG genes, and improve the composting with its application.


Assuntos
Argila , Compostagem , Esterco , Ciclo do Nitrogênio , Nitrogênio/metabolismo , Amônia/metabolismo , Animais , Galinhas , Desnitrificação/genética , Esterco/análise
15.
J Hazard Mater ; 366: 184-191, 2019 03 15.
Artigo em Inglês | MEDLINE | ID: mdl-30528588

RESUMO

The aim was to evaluate pathogenic bacteria (PB) survival during the composting of chicken manure (CM) amended with five different dosages of clay compared to CM without clay-applied treatment. The results showed that 85-87% of PB relative abundances (RAs) were significantly reduced in lower dosages of applied clay (T2 and T3). However, the maximum survival of PB was noticed in the T6 and T5 treatments, but most of the PB belong to Firmicutes, Actinobacteria and Proteobacteria phylum and their derivative bacterial species. The changes in PB during the composting were not only strongly influenced by clay amendment but also significantly associated with the succession of bacterial species in compost. Bacillus, Clostridium, Mycobacterium and Klebsiella were the dominant spore-forming bacteria identified in higher dosages of clay (i.e., T4, T5 and T6) treatments, but very low abundance of these bacterial genus and its species were recovered from lower dosages of clay (T2 and T3)-applied treatments. Overall, without clay, amended-CM-derived compost contained a relatively higher PB abundance than other treatments, as the anaerobic bacterial species Clostridium_difficile_AA1, Vibrio_cholerae, and Acinetobacter_calcoaceticus had relatively greater RAs, followed by Klebsiella_oxytoca_10-5248, Paenibacillus_Bacillus_cereus and Bartonella_quintana_RM-11. Thus, CM composting with 4% clay amendment is considered a useful method for the efficient recycling of CM, as this process produced sanitized compost with less survival of PB.


Assuntos
Bactérias/patogenicidade , Argila/química , Compostagem , Esterco/microbiologia , Metagenômica , Animais , Galinhas
16.
Bioresour Technol ; 252: 59-65, 2018 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-29306130

RESUMO

In this work, the influence of composting on the thermal decomposition behavior and decomposition kinetics of pig manure-derived solid wastes was analyzed using thermogravimetry. Wheat straw, biochar, zeolite, and wood vinegar were added to pig manure during composting. The composting was done in the 130 L PVC reactors with 100 L effective volume for 50 days. The activation energy of pyrolysis of samples before and after composting was calculated using Friedman's method, while the pre-exponential factor was calculated using Kissinger's equation. It was observed that composting decreased the volatile content of all the samples. The additives when added together in pig manure lead to a reduction in the activation energy of decomposition, advocating the presence of simpler compounds in the compost material in comparison with the complex feedstock.


Assuntos
Compostagem , Esterco , Animais , Solo , Resíduos Sólidos , Suínos , Triticum
17.
Ecotoxicol Environ Saf ; 145: 313-323, 2017 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-28756252

RESUMO

This explorative study was aimed to assess the efficiency of lime alone and in combined with additives to immobilize Pb, Cd, Cu and Zn in soil and reduce their phytoavailability for plant. A greenhouse pot experiment was performed by using low and heavily contaminated top soils viz. Tongguan contaminated (TG-C); Fengxian heavily contaminated (FX-HC) and Fengxian low contaminated (FX-LC). The contaminated soils were treated with lime (L) alone and in combined with Ca-bentonite (CB), Tobacco biochar (TB) and Zeolite (Z) at 1% and cultivated by Chinese cabbage (Brassica campestris L). Results revealed that all amendments (p< 0.05) significantly reduced the DTPA-extractable Pb 97.33, Cd 68.06 and Cu 91.11% with L+TB, L+CB, L+Z in FX-LC soil and Zn 87.12% respectively, with L+CB into TG-C soil. Consequently, the application of lime alone and in combined with additives were drastically decreased the dry biomass yield of Brassica campestris L. as compared with control. Thus, these feasible amendments potentially maximum reduced the uptake by plant shoots upto Pb 53.47 and Zn 67.93% with L+Z and L+TB in FX-LC soil, while Cd 68.58 and Cu 60.29% with L+TB, L+CB in TG-C soil but Cu uptake in plant shoot was observed 27.26% and 30.17% amended with L+TB and L+Z in FX-HC and FX-LC soils. On the other hand, these amendments were effectively reduced the potentially toxic metals (PTMs) in roots upto Pb77.77% L alone in FX-HC, Cd 96.76% with L+TB in TG-C, while, Cu 66.70 and Zn 60.18% with L+Z in FX-LC. Meanwhile, all amendments were responsible for increasing soil pH and CEC but decreased soils EC level. Based on this result, these feasible soil amendments were recommended for long term-study under field condition to see the response of another hyper accumulator crop.


Assuntos
Compostos de Cálcio/química , Chumbo/análise , Óxidos/química , Poluentes do Solo/análise , Zinco/análise , Biomassa , Brassica/química , Brassica/crescimento & desenvolvimento , Carvão Vegetal/química , Metalurgia , Metais Pesados/análise , Raízes de Plantas/química , Brotos de Planta/química , Brotos de Planta/crescimento & desenvolvimento , Solo/química
18.
Waste Manag ; 68: 760-773, 2017 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-28623022

RESUMO

In the present study, biochar combined with a higher dosage of zeolite (Z) and biochar (B) alone were applied as additives for dewatered fresh sewage sludge (DFSS) composting using 130-L working volume lab-scale reactors. We first observed that the addition of a mixture of B and Z to DFSS equivalent to 12%B+10% (Z-1), 15% (Z-2) and 30% (Z-3) zeolite (dry weight basis) worked synergistically as an amendment and increased the composting efficiency compared with a treatment of 12%B alone amended and a control without any amendment. In a composting reactor, the addition of B+Z may serve as a novel approach for improving DFSS composting and the quality of the end product in terms of the temperature, water-holding capacity, CO2 emissions, electrical conductivity, water-soluble and total macro-nutrient content and phytotoxicity. The results indicated that during the thermophilic phase, dissolved organic carbon, NH4+-N and NO3--N increased drastically in all biochar amended treatments, whereas considerably low water-soluble nutrients were observed in the control treatment throughout and at the end of the composting. Furthermore, the maturity parameters and dissolved organic carbon (DOC) indicated that compost with 12%B+15%Z became more mature and humified within 35days of DFSS composting, with the maturity parameters, such as CO2 evolution and the concentration of NH4+-N in the compost, being within the permissible limits of organic farming in contrast to the control. Furthermore, at the end of composting, the addition of higher dosage of biochar (12%) alone and 12% B+Z lowered the pH by 7.15 to 7.86 and the electrical conductivity by 2.65 to 2.95mScm-1 as compared to the control, while increased the concentrations of water-soluble nutrients (gkg-1) including available phosphorus, sodium and potassium. In addition, greenhouse experiments demonstrated that the treatment of 150kgha-1 biochar combined with zeolite and that of 12%B alone improved the yield of Chinese cabbage (Brassica rapa chinensis L.). The highest dry weight biomass (1.41±0.12g/pot) was obtained with 12%B+15%Z amended compost. Therefore, 12%B+15%Z can be potentially applied as an amendment to improve DFSS composting.


Assuntos
Esgotos/química , Zeolitas , Carvão Vegetal , Nitrogênio , Solo
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