Effect of gentamicin mycelial residues disintegration by microwave-alkaline pretreatment on methane production and gentamicin degradation during anaerobic digestion

Jiang, Mingye; Song, Siqi; Liu, Huiling; Wang, Peng; Dai, Xiaohu

doi:10.1016/j.cej.2021.128790

Cited by 25 publications

(11 citation statements)

References 46 publications

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“…In recent years, microwave (MW) irradiation has been widely used as an efficient and environmentally friendly sludge treatment method. Its main advantages are high efficiency, good selectivity, low cost, and strong controllability (Yu et al, 2009;Liu et al, 2016;Jiang et al, 2021). Our preliminary studies showed that the application of the combined treatment of CaO 2 and MW is an efficient technique for sludge reuse (Wang and Li, 2016).…”

Section: Introductionmentioning

confidence: 86%

Synergetic Effect of Combined CaO2 and Microwave Treatment on Waste Active Sludge Dewaterability and Organic Contaminants’ Removal

Wang

Shang

Liu

et al. 2021

Front. Environ. Sci.

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This study investigated the synergetic effect of the combined calcium peroxide (CaO2) and microwave (MW) treatment on waste active sludge dewatering properties and organic contaminants’ removal. The optimal sludge dewaterability was obtained at CaO2 (20 mg/gVSS)/MW (70°C), and the capillary suction time decreased by 52% compared with raw sludge. Further investigation indicated that total extracellular polymeric substances (EPS), tightly bound EPS, total protein, and protein present in tightly bound EPS were closely correlated with sludge dewaterability. Tryptophan, aromatic protein–like substances and humic acid–like substances were the key compounds that affect sludge dewaterability. The charge neutralization and bridge effect of cation ions were strengthened when combined with MW irradiation. In addition, it was revealed that MW facilitated CaO2 to produce more hydroxyl and superoxide anion radicals. This study confirmed CaO2/MW to be an effective way to improve sludge dewatering and remove organic pollutants from sludge.

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Section: Introductionmentioning

confidence: 86%

Synergetic Effect of Combined CaO2 and Microwave Treatment on Waste Active Sludge Dewaterability and Organic Contaminants’ Removal

Wang

Shang

Liu

et al. 2021

Front. Environ. Sci.

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“…Raw GMRs collected from Henan Renhua Biotechnology Co., Ltd., China, were stored in the laboratory at −20 °C. According to the previous study, the raw GMRs were basified to pH 12 and irradiated by a microwave oven (900 W, 3 min). Afterward, the pH of mixture was neutralized to 7.0 ± 0.1 prior to feeding into the AD reactor.…”

Section: Methodsmentioning

confidence: 99%

“…These obviously pose a serious threat to public health . On the other hand, as AMRs with a large annual production of millions of tons worldwide also contain abundant organic matters, extensive effort has been devoted to exploring the feasibility of resource recovery from AMRs. − The biomethane potential of AMRs has been reported to be more than 300 mL/gVS, which was comparable to that of sewage sludge and livestock manure, , etc. Therefore, sustainable AD technology is considered as a promising technology for recycling energy from AMRs.…”

Section: Introductionmentioning

confidence: 99%

“…So far, extensive research has been conducted on the performance of mesophilic AD of AMRs using short-term batch tests. , For example, various pretreatment technologies were developed for improving the hydrolysis efficiency of AD, , while thermophilic AD was also shown to be effective for enhancing methane production compared to mesophilic AD . In addition to high methane production, the operational stability of AD system is also a crucial issue.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Operating Strategies on the Anaerobic Digestion of Gentamicin Mycelial Residues: Insights into the Enhancement of Methane Production and Attenuation of Gentamicin Resistance

Jiang

Wang

Liu

et al. 2022

Environ. Sci. Technol.

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Anaerobic digestion (AD) has been widely employed for converting various biowastes into renewable energy. However, AD of gentamicin mycelial residues (GMRs, a byproduct of gentamicin production) is limited by ammonia inhibition and antimicrobial resistance risk. Compared to mesophilic AD (MMAD) of GMRs, this study looked into three semicontinuous AD processes, i.e., codigestion with wheat straw, thermophilic digestion (TAcoD), and AD at shortened retention time (RT). Results showed that a stable and safe AD could be achieved under suitable operating conditions. Co-digestion could effectively mitigate the adverse effect of ammonia inhibition. The methane production increased by 35.86% in TAcoD compared to that in MMAD and 43.99% of hazardous waste was reduced in TAcoD. Concerning the antimicrobial resistance of AD system, gentamicin was degraded efficiently and the degradation process was not involved in the expression of antibiotic resistance genes (ARGs) related to modifying enzyme. Effective removal of ARGs under three operating strategies was associated with a higher reduction in bacterial abundance of potential hosts. In addition, the changes in the relevant proteins for transformation and conjugation as predicted by PICRUSt suggested that thermophilic condition and shorter RT were conducive to the reduction of the dissemination risks of ARGs.

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“…There are some risks such as deterioration of the structure and reduction in the efficiency of anaerobic flocs (Jiang et al 2021). Even at a smaller scale, the biomethane composition achieved so far is not that promising.…”

Section: Chemoautotrophic Methodsmentioning

confidence: 99%

Biogas upgrading, economy and utilization: a review

et al. 2021

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Biogas production is rising in the context of fossil fuel decline and the future circular economy, yet raw biogas requires puri-fication steps before use. Here, we review biogas upgrading using physical, chemical and biological methods such as water scrubbing, physical absorption, pressure swing adsorption, cryogenic separation, membrane separation, chemical scrubbing, chemoautotrophic methods, photosynthetic upgrading and desorption. We also discuss their techno-economic feasibility. We found that physical and chemical upgrading technologies are near-optimal, but still require high energy and resources. Biological methods are less explored despite their promising potential. High-pressure water scrubbing is more economic for small-sized plants, whereas potassium carbonate scrubbing provides the maximum net value for largesized plants.

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Effect of gentamicin mycelial residues disintegration by microwave-alkaline pretreatment on methane production and gentamicin degradation during anaerobic digestion

Cited by 25 publications

References 46 publications

Synergetic Effect of Combined CaO2 and Microwave Treatment on Waste Active Sludge Dewaterability and Organic Contaminants’ Removal

Synergetic Effect of Combined CaO2 and Microwave Treatment on Waste Active Sludge Dewaterability and Organic Contaminants’ Removal

The Effect of Operating Strategies on the Anaerobic Digestion of Gentamicin Mycelial Residues: Insights into the Enhancement of Methane Production and Attenuation of Gentamicin Resistance

Biogas upgrading, economy and utilization: a review

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