The environmental impacts from energy consumption account for a high percentage of the environmental impacts of wastewater treatment plants (WWTPs) throughout their life cycle; therefore, controlling energy use in WWTPs could bring substantial benefits to the environment. In this study, according to the different percentages of electricity generation from renewable energy compared to fossil energy, the global warming, acidification, eutrophication, human toxicity, and photochemical smog, the environmental impacts of WWTP operation were considered. Furthermore, to explore a more sustainable way of operating WWTPs under the “dual-carbon” strategic decision, the environmental impacts and energy utilization efficiency of different power allocation scenarios at present and in the next 40 years were compared based on the LCA+DEA integrated model. The study revealed that in scenarios 1–5, as the proportion of renewable energy power generation gradually increased, all LCA results showed a gradual decrease, of which GWP decreased by 83.32% and human toxicity decreased by 93.34%. However, in scenarios 2–5, the contribution ratio (proportion) of gas and electricity to GWP and POCP gradually increased, reaching 77.11% and 59.44%, respectively, in scenario 5. The contribution ratio (proportion) of biomass generation to AP and EP gradually increased as well, reaching 65.22% and 68.75%, respectively, in scenario 5. Meanwhile, the combined technical efficiency in energy utilization in the five scenarios showed a decreasing trend; only scenario 1 was fully efficient, and the combined efficiency was 1. The values of combined technical efficiency in scenarios 2, 3, 4, and 5 gradually decreased and were 0.7386, 0.4771, 0.2967, and 0.1673, respectively. This study discusses whether the use of renewable energy in place of fossil energy power elicits an environmental impact in WWTPs. We explore the feasibility of achieving energy savings and emission reductions in WWTPs within the Tumen River Basin, to provide a theoretical basis for their sustainable development.

In this study, we employed a constructed wetland-microbial fuel cell (CW-MFC) for the treatment of agricultural non-point source pollution, and the impacts of CW-MFC, constructed wetland (CW), and microbial fuel cell (MFC) on agricultural non-point source pollution processing performance, electrical performance, and changes in the microbial community within the system were compared and analyzed to explore the synergistic effect of CW-MFC coupling. The findings indicated that the coupling of CW and MFC effectively enhanced the processing performance, electrical performance, and enzyme activity of CW-MFC. The electric field’s promotion of the removal rate of chemical oxygen demand (COD) and total nitrogen (TN) was greater than that of plants, while the electric field’s promotion of the removal rate of total phosphorus (TP) was smaller than that of plants. The promoting effect on the removal rate of atrazine was greater than that of plants at a low concentration of atrazine, but smaller than that of plants at medium and high concentrations of atrazine. The promoting effect of the electric field on urease (UE) and catalase (CAT) activities was generally greater than that of plants, while the promoting effect on alkaline phosphatase (ALP) activity was greater in plants. Affected by the coupling of CW and MFC, the microbial community diversity of CW-MFC and the abundance of bacterial phyla, classes, and genera such as Acidobacteria, Deltaproteobacteria, Aquabacterium, Geobacter, and Subgroup_6 were detected. The abundance of terpenoids and polyketides increased to varying extents. The results of this study laid a solid theoretical foundation for the advancement of agricultural non-point source pollution control technology and provided strong support for the expansion of CW to new application fields. It has profound significance for effectively controlling agricultural non-point source pollution and ensuring the sustainable development of agriculture.

This study investigates the degradation characteristics of chlorpyrifos under individual exposure and compound exposure to multiple pesticides in both traditional constructed wetlands and electrochemically constructed wetland coupled systems, while also analyzing the microbial communities within the systems using high-throughput sequencing technology. The results show that the electric field can enhance the degradation performance of the system. The degradation effect of the coupled electrochemically constructed wetland coupled system is better than that of the traditional constructed wetland, while the compound exposure to multiple pesticides inhibits the degradation efficiency. Under the influence of pesticides, the diversity of microbial communities decreases towards the end of the system operation, and the electrochemically constructed wetland coupled system exhibits lower diversity compared to the traditional constructed wetland. Proteobacteria is the dominant phylum under compound exposure to multiple pesticides, while Firmicutes, Fusobacteria, Verrucomicrobia, Aeromonas, and Methylophilus are the dominant electrochemically active phyla and genera in the electrochemically constructed wetland coupled system. The impact of pesticides and the electric field results in a decrease in amino acid metabolism and carbohydrate metabolism functions, while membrane transport functions increase. The compound exposure to multiple pesticides has a more significant impact on the microbial community structure and functionality than the electric field. The results also lay a theoretical foundation for the expansion of pesticide degradation technology and constructed wetland treatment technology to new fields, which is of great significance in realizing the “zero direct discharge” of agricultural production wastewater, solving the problem of agricultural non-point source pollution and ensuring the availability of agricultural production.

This study explored the relationship between soil microbial community structure and soil environmental factors in river wetlands of Tumen River Basin by analyzing the soil microbial community structure and combining soil environmental factors.As a result, there were significant differences in microbial community diversity among river wetlands in the Tumen River Basin. Proteobacteria and Actinobacteria were the abundant dominant phylum of microbial, moreover,Actinobacteria and Alphaproteobacteria were the dominant class of microbial.Soil environmental factors such as soil organic matter, soil total nitrogen and soil total potassium are the main factors affecting the change of microbial community structure in river wetlands of Tumen River Basin.

In this study, chlorpyrifos degradation under different operating conditions was examined in a constructed wetland system, and the degradation conditions were optimized. Additionally, the microbial community structure in wetland system was analysed by high-throughput sequencing. The results are that the best chlorpyrifos degradation conditions in the constructed wetland system were pH = 8.69, sand/natural soil ratio of 1.36:1, and a planting density of 173.73/m². The actual chlorpyrifos degradation rate was 75.68%. Moreover, Proteobacteria, Bacteroidetes and Actinobacteria; Gemmatimonas, Gp6 and Parcubacteria and so on had gradually become the main chlorpyrifos degraders of dominant phylum and genera with extension in a constructed wetland system.