Simulating CH4 emissions from MSW landfills in China from 2003 to 2042 using IPCC and LandGEM models.

Anaerobic landfills have long been the primary means of municipal solid waste (MSW) disposal in China. Landfills are the third largest emission source of methane (CH4), which is the second most abundant greenhouse gas in the atmosphere and has a high greenhouse effect. To date, there have been no reliable model predictions of long-term CH4 emissions from landfills in China. In this study, two general models, IPCC and LandGEM, were introduced to simulate CH4 emissions from all landfills in China. By comparing the results of the Shuangkou landfill in Tianjin with the default and local parameters, the local parameters were fixed to simulate landfill CH4 emissions in 31 regions over 40 years (2003-2042). The MSW landfills were obtained from statistical data for 18 years (2003-2020). The total emissions in China predicted by LandGEM and IPCC were 2.42 E+07 Mg and 2.36 E+07 Mg, respectively. These data provide a reliable reference for determining the long-term CH4 emissions from landfills in China.

Microbial degradation of petroleum characteristic pollutants in hypersaline environment, emphasizing n-hexadecane and 2,4 di-tert-butylphenol.

In this paper, nine strains of salt-tolerant petroleum-degrading bacteria were applied to an biological aerated filter. Simulating the degradation of high-salinity petroleum wastewater with n-hexadecane and 2,4-ditert-butylphenol as the primary pollutants and analyzing the structure of the biofilm at various salt concentrations. According to the results, when the salinity was 4%, the COD removal efficiency reached 74.34%. Various halotolerant microorganisms have adapted to various salt concentrations. At a salinity of 3%, n-hexadecane exhibited the best degradation effect, with a rate of 83.21%. Shewanella, Acinetobacter, and Marinobacter were the predominant bacterial groups at the time. At 4% salinity, Acinetobacter and Pseudomonas were the predominant bacteria, and the average 2,4-ditert-butylphenol degradation rate was the highest at 63.02%. This study provided an experimental basis for further studying the biological treatment of high-salinity petroleum wastewater.

Research Themes and Trends of Hen of the Woods or Maitake Medicinal Mushroom Grifola frondosa (Agaricomycetes): A Bibliometric Analysis of the Knowledge Field.

This paper aims to characterize the knowledge field of Grifola frondosa and analyze its research themes and trends. CiteSpace, a powerful bibliometric analysis tool, was adopted to visualize the knowledge field of G. frondosa research for facilitating this current study. A total of 747 articles and reviews retrieved from the Web of Science Core Collection (WoSCC) database between 1998 and 2022 were analyzed by CiteSpace. It was found that China and Japan are the most influential countries in G. frondosa research. Secondly, polysaccharide, bioactivity, structural characterization, and submerged culture are the main themes of G. frondosa research, among which bioactivity and structural characterization are the current research hotspots. Finally, selenium polysaccharide and gut microbiota may be the emerging trends in G. frondosa research in the future. This study could help researchers discern the evolution and future trends of G. frondosa research and provide a reference for related research work.

Toward a Slow-Release Borate Inhibitor To Control Mild Steel Corrosion in Simulated Recirculating Water.

On the basis of their potential passivating characteristics, in this study, borates have been used to synthesize a novel slow-release inhibitor to suppress long-term mild steel corrosion in simulated recirculating water. The passivating performance was characterized by various electrochemical measurements and the passivating mechanism was interpreted by the point defect model. The experimental results indicated that the slow-release inhibitor exhibited a passivating efficiency of over 98% after 30 days of immersion, due to the formation of a passive film that was predominant by a Fe-O-B structure on the mild steel surface. This study provides a novel controlled-release concept and a slow-release borate inhibitor to control long-term corrosion.