Heavy metal- and organic-matter pollution due to self-heating coal-waste dumps in the Upper Silesian Coal Basin (Poland).

The adsorption of Cr6+ ions from water-soluble solution onto activated pea peels (PPs) embellished with triethylenetetramine (TETA) was studied. The synthesized activated TETA-PP biosorbent was further characterized by SEM together with EDX, FTIR and BET to determine the morphology and elementary composition, functional groups (FGs) present and the biosorbent surface area. The confiscation of Cr6+ ions to activated TETA-PP biosorbent was observed to be pH-reliant, with optimum removal noticed at pH 1.6 (99%). Cr6+ ion adsorption to activated TETA-PP biosorbent was well defined using the Langmuir (LNR) and the pseudo-second-order (PSO) models, with a determined biosorption capacity of 312.50 mg/g. Also, it was found that the activated TETA-PP biosorbent can be restored up to six regeneration cycles for the sequestration of Cr6+ ions in this study. In comparison with other biosorbents, it was found that this biosorbent was a cost-effective and resourceful agro-waste for the Cr6+ ion confiscation. The possible mechanism of Cr6+ to the biosorbent was by electrostatic attraction following the surface protonation of the activated TETA-PP biosorbent sites. 

/pdf/adsorption-of-cr6-ion-using-activated-pisum-sativum-peels-1hwkk03i.pdf

Adsorption of Cr6+ ion using activated Pisum sativum peels-triethylenetetramine

China's transportation sector is a vital link between production and consumption, but it also has issues with low efficiency, high carbon emissions, and technological bottlenecks. To improve efficiency and provide actionable recommendations and strategies, this study first constructs a comprehensive evaluation index system to gauge the transportation sector's inputs using panel data from different Chinese provinces from 2007 to 2021. Within the assessment system, the principal component analysis (PCA) method is used to reduce the dimension of the indexes, thereby yielding a set of adjusted inputs. Subsequently, the transportation system efficiency (TSE) is evaluated using the super-efficiency SBM-DEA model, which includes unexpected outputs such as carbon emissions, and three-stage DEA modifies the efficiency. Then, we calculate the Malmquist-Luenberger index (TML) and its components: technological change (TTC) and technological efficiency change (TEC). Lastly, the influential factors impacting TSE are analyzed via a truncated regression Tobit model. The following are the conclusions: (1) The transportation industry in China exhibits inefficiency, and the average TSE in Stage I and III is 0.91 and 0.93, respectively. TSE is underestimated due to the influence of external environmental factors and inefficiencies in management in Stage I. (2) TSE in the eastern area also produces significant carbon emissions that surpass the national average. At the same time, other regions face efficiency limitations due to geographical constraints and management obstacles. (3) Insufficient technical capacity is a major cause of inefficiency in the transport sector and is prevalent in the northeast, west, and central regions. (4) Population growth and income per capita advancements foster transportation industry development, while increased GDP, fiscal revenues, and traffic accidents contribute to declining efficiency. The study above findings serve as a foundation for regional and national management initiatives and policies to enhance transportation effectiveness. 

Efficiency evaluation of China's transportation system considering carbon emissions: Evidence from big data analytics methods.

How bioaugmentation with Comamonas testosteroni accelerates pyridine mono-oxygenation and mineralization.

In the context of the low-carbon transition, enhancing green innovation efficiency (GIE) emerges as a vital pathway for the manufacturing industry to achieve sustainability. However, within the ongoing wave of digital transformation (DT), there is limited research addressing the connection between DT and GIE in manufacturing firms. Drawing from the resource-based view and resource dependency theory, this research aims to evaluate the potential of DT in driving GIE by analyzing data from 682 publicly listed manufacturing firms in China between 2011 and 2021. Our findings indicate that DT exerts a notable and positive influence on GIE. Meanwhile, this study identifies improving management efficiency as the mediating pathway through which DT affects GIE. Additionally, R&D subsidies positively moderate the beneficial impact of DT on GIE. Lastly, state-owned companies derive greater benefits in terms of GIE from the process of DT. 

Impact assessment of digital transformation on the green innovation efficiency of China's manufacturing enterprises

Coke was used as adsorbent to explore the performance of an adsorption-biological coupling reactor when treating sulfonamide antibiotics (SAs) wastewater under different influent frequencies and aeration rates. Meanwhile, the effects of SAs on the microbial community dynamics and metabolomics of the coupling reactor were also investigated. Results showed that the treatment efficiency on SAs wastewater was the best when the influent frequency was once every two days (0.80 L each time) and the aeration rate was 10.00 mL/min. The average removal rate of COD, TP and NH3-N was 95.68 %, 66.09 %, 97.84 %, respectively. Meanwhile, the average removal rates of sulfadiazine (SD) and sulfamethoxazole (SMX) were 88.29 % and 96.76 %. Plasticicumulans, Nakamurella, and Pseudomonas were the main functional bacteria. The nitrate reductase gene (narGH) and phosphate-specific transport system subunit (pstSC) were the genes with the highest average abundance of nitrogen and phosphorus metabolism. Further, 4-hydroxy-2-hydroxylaminopyrimidine, N-phenylacetamide, 4-aminophenol, and hydroquinone were detected as SD and SMX intermediate metabolites. Therefore, the use of adsorption-biological coupling technology to wastewater containing SAs has a certain application prospects. 

Performance, microbial community, and metabolism pathway in adsorption-biological coupling reactor treating sulfonamide antibiotics wastewater: Effect of influent frequency and aeration rate

Based on the panel data of 33 Chinese state-owned toll road companies (CSTCs) from 2013 to 2019, this study evaluates companies' operational management efficiency using a three-stage SBM-DEA model that can purge the effects of environmental factors and statistical noise. On this basis, a nonlinear time-varying factor model is then used to conduct a club convergence analysis of the operational management efficiency of CSTCs. The results show that the mean value of the operational management efficiency of CSTCs is 0.938, and the operational management efficiency is underestimated to varying degrees if environmental factors and statistical noise are not considered. The operational management efficiency of CSTCs shows spatial imbalance and temporal stability. The club convergence test indicates that there are three potential club clusters for the operational management efficiency of CSTCs, and it presents a “blockchain” clustering distribution. The findings of this study extend the research scope of managerial efficiency and have practical significance for helping CSTCs achieve high-quality and more efficient development. 

Operational management efficiency and club convergence of Chinese state-owned toll road companies: A three-stage SBM-DEA model

Pyridine is a toxic component in industrial wastewater, which is difficult to remove using conventional methods. In this study, the cost-effective coke powder was used to remove pyridine from a pyridine simulation wastewater. The removal efficiency and adsorption capacity of pyridine reached up to 67.32% and 0.4488 mg/g, respectively, at a coke powder concentration of 60 mg/L and an adsorption time of 30 min. The pyridine removal efficiency and adsorption capacity of coke powder reached saturation when the initial concentration was 40 mg/L. The pH of 2–12 in the solution was found to have little effect on the pyridine adsorption process of coke powder, while the coke powder with lower ash content was of better adsorbability for pyridine. The coke powder was regenerated by heat treatment, and reused for pyridine adsorption. It was found that the pyridine removal efficiency slightly decreased after nine times of reuse, in addition to a small cumulative weight loss rate of coke powder. Adsorption isotherm analysis showed that the adsorption of pyridine by coke powder could be well described by the Freundlich isothermal adsorption model, indicating multi-molecular layers mainly dominated the adsorption of pyridine on the surface of coke powder.

https://www.mdpi.com/2227-9717/7/7/459/pdf

Adsorptive Removal of Pyridine in Simulation Wastewater Using Coke Powder

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Performance, microbial community, and metabolism pathway in adsorption-biological coupling reactor treating sulfonamide antibiotics wastewater: Effect of influent frequency and aeration rate

Operational management efficiency and club convergence of Chinese state-owned toll road companies: A three-stage SBM-DEA model

Adsorptive Removal of Pyridine in Simulation Wastewater Using Coke Powder