Comprehensive Evaluation of Sustainable Treatment Technology of Oily Sludge Based on AHP-FCE

Oil is an unsustainable energy since it is non-renewable. However, oil may not be completely replaced in a short time, so the environmental problems caused by the oil development still require our attention. The oily sludge is a kind of hazardous waste produced during the oil development. To reduce the environmental impact caused by oily sludge, low-carbon and sustainable treatment technologies need to be selected. The incineration, chemical extraction and thermal desorption are common technologies for treatment of oily sludge. We calculated the carbon emissions of these technologies. Then the index evaluation system of oily sludge treatment technology was established with the environmental, economic, social, and technical factors. And the weight of evaluation index was determined by the analytic hierarchy process (AHP). Through the investigation of industry experts, we evaluated the treatment technologies by the fuzzy comprehensive evaluation method (FCE). The results showed that the carbon emissions of incineration are 42.70 t CO₂-eq/t which is the highest. Meanwhile, it is 4.80 t CO₂-eq/t and 0.10 t CO₂-eq/t for chemical extraction and thermal desorption, respectively. The comprehensive scores of incineration, chemical extraction and thermal desorption were 4.59, 5.16 and 4.95, respectively. Therefore, the chemical extraction technology is an optimal treatment technology for oily sludge with the relatively low carbon emission and the highest comprehensive technical score. At the same time, the thermal desorption technology has strong application potential with the lowest carbon emissions. This result provides a reference for achieving clean and sustainable energy development processes.

Role of Youth in Implementing SDGs Future City in Tosacho, Kochi, Japan

The “SDG Future Cities” established by the SDG (Sustainable Development Goals) Promotion Headquarters of Cabinet Office of Government of Japan, are being expanded to all municipalities in Japan through government support for the efforts of leading municipalities. Tosa town is a small town with less than 4000 people with high aging population and surrounded by mountains in Kochi Prefecture. The town was selected as one of the SDG Future City in 2020. In this paper, through a literature review, interviews with the Tosa Town Office, and a questionnaire survey and interview with residents of Tosa town, we considered what young people need to do to achieve SDG-11. Although Tosa Town has a variety of local government initiatives, the definition of a town where young people can continue to live, as revealed in the literature review, was found to be insufficient in terms of “economic resources,” “decision-making,” “data,” and “knowledge”. However, it was found that “community leaders,” “nature/topography,” and “community/people” are the most important factors for creating a town where people can continue to live. As for future issues, it is necessary to take measures for “decision-making,” “data,” and “knowledge,” as well as to solve issues specific to Tosa town.

Nitrogen-controlled Valorization of Xylose-derived Compounds by Metabolically Engineered Corynebacterium glutamicum

The implementation of bioprocesses in an economically feasible and industrial competitive manner requires the optimal allocation of resources for a balanced distribution between biomass formation and product synthesis. The decoupling of growth and production in two-stage bioprocesses, aiming to ensure sufficient growth before the onset of production, is particularly relevant when target products inhibit growth. In order to avoid expensive inducer molecules, continuing process monitoring, elaborate individual process optimization, and strain engineering, we developed and applied nitrogen deprivation-induced expression of genes for product biosynthesis. Two native nitrogen deprivation-inducible promoters were identified and shown to function for dynamic growth-decoupled gene expression or CRISPRi-mediated gene knockdown in C. glutamicum with superior induction factors than the standard IPTG-inducible P_trc promoter. Valorization of xylose to produce either the sugar acid xylonic acid or the sugar alcohol xylitol from xylose as sole source of carbon and energy was demonstrated. Competitive titers of up to 34 g·L⁻¹ xylonate and 13 g·L⁻¹ xylitol were achieved in two-stage processes. We discussed that the transfer to bioprocesses with C. glutamicum using carbon sources other than xylose appears straightforward in particular regarding production of growth-inhibitory compounds by their growth-decoupled fermentative production.

Current Challenges to the Sustainable Development of Rural Communities in Russia's Central Chernozem Region

The rural community system in the Central Chernozem Economic Region in Russia is undergoing a radical transformation under the interrelated influence of fundamental factors that have rendered the development of many communities unsustainable. This paper analyses the role of urbanisation processes in population changes and transformation of rural community systems in the region; determines the level of horizontal mobility among the rural population, as well as its impact on settlement evolution; assesses the share of small and extremely small communities in settlement composition; and outlines these communities’ future development prospects. The authors believe that the socio-demographic “desertification” of peripheral municipalities can pose challenges to rural development: a shortage of labour resources, changes in population quality, and problems of innovation diffusion. The study recommends improving the comfort of the living environment and accelerating the technical re-equipment and automation of agricultural production.

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