Highly efficient photocatalytic oxidation of antibiotic ciprofloxacin using TiO2@g-C3N4@biochar composite

Environmental Science and Pollution Research - In this present study, a novel indirect Z-scheme TiO2@g-C3N4@biochar (TiO2@g-C3N4@BC) composite photocatalyst was successfully fabricated and...     

Characteristics,decoupling effect,and driving factors of regional tourism’s carbon emissions in China

Environmental Science and Pollution Research - By revealing the temporal and spatial differentiation of China’s regional tourism carbon emissions and its decoupling relationship with tourism...     

How does power technology innovation affect carbon productivity? A spatial perspective in China

Power technology innovation has been positioned as an effective way to contribute to China’s carbon productivity. However, limited empirical evidence exists on the impact of power technology innovation on carbon productivity. Thus, based on the annual panel dataset of 30 China’s provinces from 2001 to 2019, this study explored whether and how power technology innovation promotes or impedes the improvement of carbon productivity. First, carbon productivity in the framework of total factor was calculated based on the metafrontier Malmquist-Luenberger productivity index. Second, the effect of power technology innovation on carbon productivity was investigated using the spatial Durbin model. And we also examined whether heterogeneous power technology innovations have a synergistic effect on carbon productivity. Third, influence mechanism of power technology innovation affecting carbon productivity was identified. Results show that (1) there are notable differences in China’s provincial carbon productivity, which is characterized by the spatial correlation. (2) Local power technology innovation has a promotion effect on carbon productivity in both local and neighboring provinces. Moreover, the promotion effect of breakthrough power technology innovation is stronger than that of incremental power technology innovation. (3) Catching-up Effect and Innovation Effect are important transmission channels through which power technology innovation improves carbon productivity. Finally, policy recommendations are provided.

     

酸化油水解废水脱酸处理工艺研究

酸化油是生产生物柴油的原料,其生产过程中产生的水解废水有机物含量高且具有强酸性,直接排放会严重污染环境。因此,对酸化油水解废水处理工艺进行研究有重要意义。通过对酸化油水解废水脱酸处理的条件及影响因素进行研究,并通过L9(34)正交实验确定了脱酸的最佳工艺条件。pH值为10,搅拌时间为15 min,温度为30℃是脱酸处理的最佳条件。     

水解酸化-SBR-BAF工艺处理中药废水

分析现有中药废水处理工艺及废水特点,并考虑到废水处理技术改造的要求,采用水解酸化-SBR-BAF法联合处理该中药废水,研究了SBR反应器的曝气时间、温度及原水pH值对系统处理效果的影响。系统进水ρ(COD)为1 249.4~1 444.5 mg/L、ρ(BOD5)为201.2~292.8 mg/L、ρ(SS)为208.7~310.6 mg/L、色度为70~100倍,曝气时间为14 h、温度为20℃、pH值为7时,出水ρ(COD)为123.4~140.8 mg/L、ρ(BOD5)为19.4~26.1 mg/L、ρ(SS)为32.7~60.4 mg/L、色度为36~50倍,COD、BOD5、SS的平均去除率分别达到90.3%、90.7%、81.8%,表明HAT-SBR-BAF法处理该中药废水是可行的。     

丘陵区坡面土壤有机碳及颗粒有机碳分布特征

测定了紫色丘陵区疏林地、荒草地和坡耕地三种土地利用方式下土壤有机碳和颗粒有机碳含量,探讨不同利用方式与坡位下土壤有机碳和土壤颗粒有机碳的分布特征.结果表明:不同土地利用方式下上坡位和中坡位土壤有机碳和颗粒有机碳含量均为疏林地＞坡耕地＞荒草地,而在下坡位两者含量变化差异较大;不同土地利用方式下各坡位土壤剖面有机碳含量均是在0～5 cm层富集,颗粒有机碳的含量也表现出一定在剖面分异性;不同土地利用方式土壤颗粒有机碳分配比例为(0.74±0.01)～(0.34±0.02),不同土地利用方式之间土壤颗粒有机碳分配比例差异较小.相关分析表明,不同利用方式下土壤有机碳、全氮和颗粒有机碳含量之间均呈显著的相关性.     

Selective sorption of perfluorooctane sulfonate on molecularly imprinted polymer adsorbents

Perfluorooctane sulfonate (PFOS), as a potential persistent organic pollutant, has been widely detected in water environments, and has become a great concern in recent years. PFOS is very stable and difficult to decompose using conventional techniques. Sorption may be an attractive method to remove it from water. In this study, the molecularly imprinted polymer (MIP) adsorbents were prepared through the polymerization of 4-vinylpyridine under different preparation conditions in order to remove perfluorooctane sulfonate (PFOS) from water. The MIP adsorbents using perfluorooctanoic acid (PFOA) as the template had good imprinting effects and could selectively remove PFOS from aqueous solution. The sorption behaviors including sorption kinetics, isotherms, and effect of pH, salt, and competitive anions were investigated. Experimental results showed that the sorption of PFOS on the MIP adsorbents was very fast, pH-dependent, and highly selective. The achieved fast sorption equilibrium within 1 h was attributed to the surface sorption on the fine adsorbents. The sorption isotherms showed that the sorption selectivity of PFOS on the MIP adsorbents decreased at high PFOS concentrations, which may be due to the double-layer sorption and the formation of PFOS micelles on the sorbent surface. The sorption of PFOS on the MIP adsorbents was mainly dominated by the electrostatic interaction between the protonated vinylpyridine on the adsorbent surface and the anionic PFOS. The prepared MIP adsorbents can potentially be applied in water and wastewater treatment for selective removal of PFOS.     

絮凝—γ射线辐照技术处理印染废水

采用絮凝—γ射线辐照技术处理印染废水,研究了最佳絮凝条件以及吸收剂量率、吸收剂量、废水pH和H2O2浓度对废水辐照处理效果的影响.实验结果表明:采用絮凝和辐照技术联用对印染废水的处理效果明显优于两个方法单独使用的效果;辐照可以显著降低废水中COD、TOC、TC和苯胺类物质的含量,并提高废水的可生化性;吸收剂量率对废水处理效果影响不大;随废水中H2O2浓度增加,COD、TOC、TIC及苯胺类含量均有所下降.     

石油污染土壤修复技术的进展

综述了石油污染土壤修复技术的发展现状及存在的瓶颈,分析了石油污染对油-水-土界面性质、土-水关系和土壤渗透性等水理性质的影响.对石油污染土壤再利用于工程建设进行了探讨,并总结了石油污染土壤主要的力学性质变化,为石油污染土壤修复技术的工程实践和机理研究提供参考.     

双极不对称预荷电静电增强过滤除尘技术的应用

双极不对称预荷电静电增强过滤除尘技术 ,是国家“九五”科技攻关课题所取得的成果之一 ,该技术采用双极不对称荷电增强方式 ,将普通静电增强效果与粉尘凝并机能有机地结合在一起 ,既提高了过滤除尘器的收尘效率 ,尤其是呼吸性粉尘的效率 ,同时又极大地改善了滤料粉尘层的结构 ,可显著地降低过滤阻力增值 ,节约运行能耗。笔者研究的该技术应用于焊接车间的焊接烟尘的治理上 ,取得了良好的效果。现场测试表明 ,该技术对焊接烟尘的滤除效率提高了 3% ,尤其对微细粉尘效果显著 ,2 μm粉尘穿透率相对下降了 4 7%。采用超细滑石粉高粉尘负荷测试结果表明 ,过滤阻力增值降低达 30 % ,清灰效果明显改善