Global NEST Journal

Water treatment ecosystem provides important habitats for various bacterial communities, but the response mechanism of this ecosystem under ultraviolet rays is not yet clear. For this reason, 16S rRNA gene sequencing is used to study the bacterial community structure and metabolic pathways under ultraviolet irradiation. Studies have shown that the bacterial communities under different ultraviolet irradiation are different, which indicates that the time of ultraviolet irradiation has an impact on the structure of bacterial communities. Analysis of driving factors shows that COD, pH, TN and NH3-N also have an impact on the relative abundance of key species. Key species under ultraviolet irradiation are Bacteroidetes, Proteobacteria, Actinobacteria, Firmicutes, Chloroflexi, and Chlamydiae, accounting for 96.69%～98.30%, and ultraviolet irradiation has a significant inhibitory effect on the relative abundance of the key species. As the dominant bacterial phyla in Plateau environment, Chlamydiae is discovered for the first time. The network co-occurrence diagrams constructed under different ultraviolet radiation show that each sample is composed of three independent network diagrams. There are 6 common dominant phyla and 33 common dominant bacterial genera in each sample, which reveals that the structure of the ecosystem is composed of more similar microorganisms, rather than random phenomena. It also reflects the competitive relationship between species and the adaptability of bacteria to the environment. Through the analysis of metabolic pathways, it is found that the dominant metabolic pathways in Plateau environment have certain changes under ultraviolet radiation. Further analysis of metabolic pathways of carbon, nitrogen and phosphorus shows that the relative abundance of related metabolic pathways has a certain change, but the difference in metabolic diagram is small, that is, the effect of ultraviolet radiation is mainly reflected in the relative abundance of metabolic pathways. These findings indicate that ultraviolet radiation in Plateau environment as an important influencing factor has an impact on microbial structure and metabolic pathways. This research provides an important theoretical basis for further understanding of water treatment ecosystem in Plateau environment, and also provides a new perspective for research on sewage treatment systems.

Several chemical coagulants previously utilize for wastewater treatment with significant performance in removing heavy metals and other parameters. However, their cost effective and the residual of toxic chemical precipitates that pose problems to human health and the environment. Therefore, using plant-based natural coagulants is considered as an alternative technique which is non-toxic, biodegradable and environmentally friendly. This research aims to explore the performance of date stones as a natural coagulant in iron and steel plant wastewater treatment and to optimize the operating parameters to assess the feasibility of using date stones in the wastewater treatment sector. Response Surface Methodology (RSM), a statistical experimental design, was used to improve the COD, TSS, NH3-N, and heavy metals removal efficiency using 1.4 g/200 mL date stones as control parameters, as well as pH and settling time. At pH 8, the most significant removal efficiency for COD, NH3-N, Fe, Mn, Al, Cu, and Ni was 61, 63, 93, 93, 96.5, 51, and 86 %, respectively. The quadratic models for the parameters chosen were found to be significant with low probability (<0.001), except for NH3-N (0.004), Fe (0.0042), and Ni (0.0025). The study's results revealed the potential of utilizing date stones as a natural coagulant for the treatment of iron and steel industrial wastewater

Nanotechnology exemplifies advancement in the field of research and development by enhancing product efficacy through the introduction of novel solutions. In the field of cosmeceuticals, the use of nanotechnology is increasing to solve some of the limitations associated with conventional goods. Cosmeceuticals are the fastest-growing section of the personal care market, and their use has skyrocketed in recent years. Nanocosmeceuticals are a type of skin, hair, nail, and lip care product that is used to cure wrinkles, photoaging, hyperpigmentation, dandruff, and hair damage. However, nanotoxicological studies have raised concerns about the impact of expanding nanoparticle use in cosmeceuticals, as nanoparticles have the potential to permeate skin and create health problems. The research on nanotechnology in cosmeceuticals focuses on the multiple unique carriers utilized for cosmeceutical delivery, their good and negative aspects, marketed formulations, toxicity, and nanocosmeceutical restrictions. The primary goal of this editorial is to highlight the advantages and disadvantages of nanoparticles used in cosmetics.

Urban ecosystem resilience is a key concern in the strategy of ecological protection and high-quality development in the Yellow River Basin. This paper uses the principle of range maximization to construct an ecosystem resilience index measurement model from the four dimensions of energy, water resources, environment, and economy and society. The spatio-temporal evolution ecosystem resilience of 99 cities in nine provinces of the Yellow River Basin from 2005 to 2019 was analyzed. The spatial econometric model was used to explore the impact of technological innovation, opening to the outside world and industrial structure on the level of ecosystem resilience, so as to provide guidance for improving the level of ecosystem resilience in the Yellow River Basin. The results are concluded as follows: The level of ecosystem resilience in the Yellow River Basin generally increased first, then decreased, and then increased again. The resilience contribution of the environmental subsystem and the economic and social subsystem is relatively large, while the resilience contribution of the water resource subsystem is relatively small. How to improve the resilience level of the water resource subsystem should be considered as a key issue. Scientific and technological innovation, opening to the outside world and industrial structure had obvious spatial impacts on the resilience of the ecosystem in the Yellow River Basin.