水污染控制管理方案优化研究——以胶州湾东北部为例

以水质目标和管理费用为约束条件,建立了水污染控制管理方案优化模型,并将其成功应用于胶州湾东北部的水污染控制管理,提出了有利于胶州湾东北部经济和水环境可持续发展的优化管理方案。实例研究表明,该优化模型可应用于水污染控制管理中,可为海岸带地区制定水污染控制方案提供科学依据。     

粉末活性炭吸附工艺处理苯酚污染水试验

采用含苯酚的试验水样模拟城市取水水源发生苯酚水污染事故,测定粉末活性炭(PAC)对水样中苯酚的吸附性能,考察PAC炭种、吸附时间、苯酚初始浓度和PAC投加量等因素对苯酚的吸附量和脱除率的影响。试验结果表明:应急处理一般的苯酚水污染事故,PAC吸附苯酚的最佳条件为:吸附时间60 min,PAC投加量为80～100 mg.L-1;PAC对苯酚的吸附过程符合Langmuir等温式。     

Effects of long-term nutrient addition on meso-micro soil arthropod communities in a Stipa baicalensis grassland北大核心CSCD

To analyze the effect of nutrient addition on small- and medium-sized soil arthropod communities in a Stipa Baikal meadow grassland, a nitrogen (N) and phosphorus (P) addition experiment was designed in the Stipa Baikal meadow grassland at Ewenki Banner, Hulunbeier City, Inner Mongolia, China in 2010. Changes in the structure and diversity of soil arthropod communities and their relationship with environmental factors were studied. Soil arthropod samples were collected during the forage greening (May), growth (August), and yellowing (end of September) periods in 2019. The results showed that: (1) compared to the control sample, N-added and NP-added samples had higher number of soil arthropods by 1.38 and 1.15 times, respectively, and an increase of 28.57% and 21.43% in the number of soil arthropod groups. The numbers of individual as well as groups of soil arthropods tended to increase with P addition; however, this response did not reach a significant level. (2) The water and heat conditions during the vegetation growth period in the test area were more suitable for the development of soil fauna communities. (3) The redundancy analysis (RDA) results further indicated that the community composition of soil fauna is mainly regulated by pH and plant evenness, and soil pH is particularly important in mediating changes in small- and medium-sized soil fauna communities. This study suggests that long-term nutrient addition has a positive impact on small- and medium-sized soil arthropod communities by changing plant evenness and soil pH, and the contribution of soil pH is greater than that of plant evenness. © 2022 Authors. All rights reserved.     

Cloning,expression, and functional identification of CaSWEET7 and CaSWEET15 genes in Canarium album北大核心CSCD

糖外排转运蛋白(sugars will eventually be exported transporters,SWEET)介导植物光合同化产物蔗糖的跨膜运输.以橄榄(Canarium album(Lour.)Raeusch.)果实为材料,通过气相色谱串联质谱(GC-MS)检测橄榄果实中糖组分及含量变化,利用RT-PCR技术克隆得到CaSWEET7和CaSWEET15基因开放阅读框(ORF)序列.结果表明:CaSWEET7和CaSWEET15基因ORF全长分别为774 bp和951 bp,分别编码长度为257个和316个氨基酸残基,具有2个MtN3_slv结构域;进化树分析表明,CaSWEET7属于CladeⅡ,CaSWEET15属于CladeⅢ.实时荧光定量PCR(qRT-PCR)技术检测其在不同发育时期的果实中相对表达量变化,结果表明,随着果实发育,CaSWEET7和CaSWEET15表达量逐渐递增,且与果实发育蔗糖含量变化呈显著正相关(相关性系数分别为0.931和0.904,P<0.05);利用酵母功能互补证明CaSWEET7和CaSWEET15基因编码的蛋白具有转运蔗糖能力.本研究表明CaSWEET7和CaSWEET15基因可能在橄榄果实蔗糖积累中发挥作用.(图9表2参44)     

Construction of an ecosystem service value evaluation system for the Longquan Mountain Urban Forest Park in Chengdu City Based on the Analytic Hierarchy Process北大核心CSCD

As a special ecosystem, an urban forest park, which is different from a regular “forest park”, is one of the key elements involved in improving the urban ecological environment and promoting the sustainable development of a city. The “urban forest park” can also significantly improve living conditions by acting as a greenbelt. The Chengdu Longquan Mountain Urban Forest Park is a rare mountain urban forest park located in the center of the city. This “urban forest park” not only provides more ecological products and maintains ecological security but also meets the growing needs of people for food, environmental quality, and spirituality. To comprehensively assess the ecological value of the Chengdu Longquan Mountain Urban Forest Park, this study used the literature analogy and questionnaire survey methods to establish a targeted ecosystem service assessment system in this study area. In addition, combined with the hierarchical analysis method, the indicator system was tested, and the specific evaluation index was determined. In the Longquan Mountain Urban Forest Park Ecosystem Service Value Index System, three first-level indicators, such as ecological material products (with a weight of 0.412 6), ecological regulation (0.327 5), and dwelling culture (0.259 9); eight secondary indicators, such as product production (0.206 3), resource supply (0.206 3), and biodiversity (0.194 4); and twenty-three tertiary indicators, such as air negative oxygen ion (0.154 7), habitat quality (0.095 9), and ecological health benefit (0.075 5), were identified. From the weights of the first and second indicators, it was clear that the supply of ecological material products is the main service function in the Longquan Mountain Urban Forest Park ecosystem. Moreover, from the weights of the third indicator, the public’s cognition and concept of the ecosystem service value of the “urban forest park” gradually shifted from the supply service of products and resources to cultural services. In summary, the ecosystem service value assessment system designed for the Longquan Mountain Urban Forest Park in this study has certain feasibility and extensibility that lays a theoretical foundation for the scientific assessment of ecological value and ecological value realization mechanism for other “forest parks” worldwide. © 2022 Authors. All rights reserved.     

Fate of microplastics in a coastal wastewater treatment plant: Microfibers could partially break through the integrated membrane system

• Fate of microplastics in integrated membrane system for water reuse was investigated. • Integrated membrane system has high removal efficiency (>98%) for microplastics. • Microplastics (>93%) were mainly removed through membrane bioreactor treatment. • Small scale fiber plastics (<200 μm) could break through reverse osmosis (RO) system. • The flux of microplastics maintained at 2.7 × 10¹¹ MPs/d after the RO treatment. Rare information on the fate of microplastics in the integrated membrane system (IMS) system in full-scale wastewater treatment plant was available. The fate of microplastics in IMS in a coastal reclaimed water plant was investigated. The removal rate of microplastics in the IMS system reached 93.2% after membrane bioreactor (MBR) treatment while that further increased to 98.0% after the reverse osmosis (RO) membrane process. The flux of microplastics in MBR effluent was reduced from 1.5 × 10¹³ MPs/d to 10.2 × 10¹¹ MPs/d while that of the RO treatment decreased to 2.7 × 10¹¹ MPs/d. Small scale fiber plastics (<200 μm) could break through RO system according to the size distribution analysis. The application of the IMS system in the reclaimed water plant could prevent most of the microplastics from being discharged in the coastal water. These findings suggested that the IMS system was more efficient than conventional activated sludge system (CAS) for the removal of microplastics, while the discharge of small scale fiber plastics through the IMS system should also not be neglected because small scale fiber plastics (<200 μm) could break through IMS system equipped with the RO system.     

Identification and expression of the COI1 gene family in Camellia sinensis and its expression in oolong tea processing北大核心CSCD

茉莉酸受体蛋白COI1(coronatine insensitive 1)是茉莉酸信号转导途径的重要组成部分,为鉴定分析茶树茉莉酸受体COI1基因家族,预测其潜在的分子功能,了解茉莉酸受体COI1基因在乌龙茶加工中应答胁迫的分子机制,利用生物信息学方法对茶树茉莉酸受体COI1进行家族成员鉴定,氨基酸序列、结构域、基因结构、进化分析以及启动子顺式元件分析,结合实时荧光定量分析CsCOI1基因在乌龙茶加工中的表达.结果显示,茶树茉莉酸受体CsCOI1家族有两个成员,均含有F-box和富亮氨酸重复序列(LRRs)两个结构域;单子叶、双子叶的COI1蛋白各聚一支,且与蜜柑进化关系较近;茶树COI1基因家族两个成员均含有3个内含子,启动子顺势元件主要有胁迫响应元件、激素响应元件以及光响应元件;转录组数据说明茶树CsCOI1基因具有较强的组织表达差异性.实时荧光定量分析表明,CsCOI1a基因在室内萎凋后表达显著上调,且15 min、30 min日光萎凋后CsCOI1b基因的表达水平显著上调,同时茉莉酸含量发生显著变化.本研究推测CsCOI1基因可能通过茉莉酸信号转导途径参与乌龙茶加工中萎凋的胁迫响应过程,该结果可为乌龙茶加工品质调控奠定基础.(图8表2参30)     

Removal of steroid hormones from mariculture system using seaweed Caulerpa lentillifera

•Steroid hormones could be removed efficiently from mariculture system using seaweed; • Caulerpa lentillifera was the most efficient seaweed for removal of steroid hormones; • More than 90% of E₂ or EE₂ were removed within 12 h using Caulerpa lentillifera; • The removal included the rapid biosorption and the slow bio-accumulation; •The hormones and nutrients in mariculture wastewater could be simultaneously removed. The removal of steroid hormones from the mariculture system using seaweeds (Caulerpa lentillifera, Ulva pertusa, Gracilaria lemaneiformis, and Codium fragile) was investigated. The results illustrated that both 17β-estradiol (E₂) and 17α-ethinylestradiol (EE₂) could be removed by the seaweeds at different levels, and the Caulerpa lentillifera was the most efficient one. More than 90% of E₂ or EE₂ at concentration of 10 μg/L was removed by Caulerpa lentillifera within 12 h. Processes including initial quick biosorption, the following slow accumulation, and biodegradation might explain the removal mechanisms of E₂/EE₂ by Caulerpa lentillifera. E₂/EE₂ removal was positively related to the nutrient level and the initial concentration of steroid hormone. A significant linear relationship for E₂ and EE₂ existed between the initial pollutant concentration and the average removal rate. The highest removal kinetic constant (k) value was obtained at 30°C as 0.34 /h for E₂ and at 20°C as 0.28 /h for EE₂, demonstrating the promising application potential of Caulerpa lentillifera in the water purification of the industrialized mariculture system with relatively high water temperature. Simultaneous and efficient removal of E₂ and EE₂ by Caulerpa lentillifera was still achieved after 3 cycles in the pilot-scale experiment. The steroid hormones and nutrients in mariculture wastewater could also be simultaneously removed using Caulerpa lentillifera. These findings demonstrated that Caulerpa lentillifera was the promising seaweed for the removal of steroid hormones in mariculture systems.     

Effects of phosphorus-containing material application on soil cadmium bioavailability: a meta-analysis

Environmental Science and Pollution Research - Diverse phosphorus-containing materials (PCMs) were widely applied in remediation of cadmium-contaminated soils, and their effects on the change of...     

Enhanced photocatalytic activity of Cu2O for visible light-driven dye degradation by carbon quantum dots

Environmental Science and Pollution Research - Cuprous oxide (Cu2O), a p-type semiconductor material, plays an important role in photocatalysis, which has narrower band gap (~2.1 eV), abundant...