生物激活液对景观水体的生物修复

在消化吸收引进生物修复药剂的基础上以农业废弃物秸秆制成的生化黄腐酸为原料,自主研发生物激活液配方,用于受污染的景观水体的生物生态修复.由两种不同含量生化黄腐酸原料分别形成生物激活液Ⅰ型和生物激活液Ⅱ型考察了两种生物激活液对校园青春河等水体的修复效果,结果表明生物激活液Ⅰ型的效果优于Ⅱ型且较为稳定.与引进药剂BO、NC进...     

生物激活剂修复污染水体的研究

生物激活剂促进污染水体的自净取得了良好的修复效果。投加量为1mg／L时,COD、NH3-N的最终去除率比空白对照分别提高了21．3％、38．4％,密闭条件下投加3mg／L生物激活剂后,水样中的溶解氧有所提高;水样初始pH在6．5～10．0时COD去除效果明显;漕河泾、青春河、颐景园、文化园四个不同水质水体的修复效果差别明显,COD的最终去除率分别为40．3％、11．7％、1．5％、39．6％,NH3-N的最终去除率分别为31．9％、27．0％、58．5％、85．4％。     

菲污染土壤原位臭氧化修复的一维模型

建立了原位臭氧化土壤修复的扩散-反应模型,该模型可以预测被处理污染物在土壤中的时空分布及臭氧的穿透曲线.运用序贯求解策略,由有限差分法获得了该模型的数值解,并根据一维土柱实验对其进行验证.土柱实验中菲含量为17mg·kg-1,臭氧进口浓度为9.4mg·L-1,气量为50mL·min-1.模拟土壤由90%的硅砂和10%的高岭土混合而成,土壤水分含量为12%.由土柱实验分别测定不同时刻菲在土柱中不同位置的残留量以及臭氧的穿透曲线.结果表明,在大多数时间里,模型对菲的时空分布拟合较好,但实验后期拟合效果不理想,而且根据模型求出的臭氧出口浓度也较实测值提前到达穿透点.这是由于模型中仅考虑了土壤中臭氧和污染物菲之间的反应,没有考虑臭氧和菲的中间降解产物之间的反应,因此需要对土壤中的臭氧化反应机理进行更深入的研究.     

Mathematical Modei of In-situ Ozonation for the Remediation of 2-Chlorophenol Contaminated Soil

A microscopic diffusion-reaction modei was developed to simulate in-situ ozonation for the remediation of contaminated soil, i.e., to predict the temporal and spatial distribution of target contaminant in the subsurface. The sequential strategy was employed to obtain the numerical solution of the modei using finite difference method. A non-uniform grid of discretization points was emploved to increase the accuracy of the numerical solution by means of coordinate transformation. One-dimensional column tests were conducted to verify the modei. The column was packed with simulated soils that were spiked with 2-chlorophenol. Ozone gas passed through the column at a flow rate of 100ml·min-1. The residual 2-chlorophenol content at different depths of the column was determined at fixed time intervals. Compared the experimental data with the simulated values, it was found that the mathematical modei fitted data well during most time of the experiment.     

2-氯酚污染土壤原位臭氧化修复的数学模型

A microscopic diffusion-reaction model was developed to simulate in-situ ozonation for the remediation of contaminated soil, i.e., to predict the temporal and spatial distribution of target contaminant in the subsurface.The sequential strategy was employed to obtain the numerical solution of the model using finite difference method. A non-uniform grid of discretization points was employed to increase the accuracy of the numerical solution by means of coordinate transformation. One-dimensional column tests were conducted to verify the model. The column was packed with simulated soils that were spiked with 2-chlorophenol. Ozone gas passed through the column at a flow time intervals. Compared the experimental data with the simulated values, it was found that the mathematical model fitted data well during most time of the experiment.     

在位分散聚合制备聚甲基丙烯酸甲酯/二氧化硅复合材料研究

采用在位分散聚合方法制备聚甲基丙烯酸甲酯 /二氧化硅微米级复合材料 ,讨论了不同表面性质的二氧化硅对材料拉伸性能、热性能、耐溶剂性能的影响 ,并用SEM、TG等手段研究了材料性能。结果表明 :由WD -70硅烷偶联剂处理过的二氧化硅微粒子填充的材料的各方面性能较好 ,由WD -10硅烷偶联剂处理过的二氧化硅填充的材料的拉伸性能次之 ,未经表面处理二氧化硅填充的材料的拉伸性能最差 ,后两者的热性能以及耐溶剂性能无明显差异     

剪切场下聚合物结晶行为的在线研究方法

将在线研究剪切场下聚合物熔体结晶行为的实验方法加以分类，以对仪器的主要部分-剪切单元和检测单元的描述为主线。介绍了各种方法的经典设备及实验过程。同时说明了各种研究手段的数据处理方法。     

原位聚合ZDMA与炭黑并用补强POE的研究

研究了原位聚合甲基丙烯酸锌(ZDMA)与炭黑并用以及体系的填充量、ZDMA理论生成量、ZnO/MMA摩尔比对聚烯烃弹性体(POE)硫化胶性能的影响.结果表明,加入炭黑改善了胶料的拉伸永久变形,当ZDMA与炭黑的用量为50～60份时,填料分散好,对胶料的补强效果显著.ZDMA理论用量为30～40份、ZnO/MMA摩尔比为0.75左右时,胶料的综合力学性能最好.     

原位热脱附土壤修复技术的关键影响因素研究

为探究原位热脱附修复技术的关键影响因素,以硝基苯和萘为目标污染物,就加热时间、加热温度、土壤含水率、污染物初始浓度、土壤类型等因素对热脱附去除效率的影响开展研究。结果表明,加热时间、加热温度、对污染物的热脱附去除效率具有重要影响,土壤含水率对去除效率有一定影响,而在加热时间较长的情况下,初始浓度和土壤类型对污染去除效率影响较小。     

Leafamine®, a Free Amino Acid-Rich Biostimulant,Promotes Growth Performance of Deficit-Irrigated Lettuce

Water deficit causes substantial yield losses that climate change is going to make even more problematic. Sustainable agricultural practices are increasingly developed to improve plant tolerance to abiotic stresses. One innovative solution amongst others is the integration of plant biostimulants in agriculture. In this work, we investigate for the first time the effects of the biostimulant –Leafamine^®–a protein hydrolysate on greenhouse lettuce (Lactuca sativa L.) grown under well-watered and water-deficit conditions. We examined the physiological and metabolomic water deficit responses of lettuce treated with Leafamine^® (0.585 g/pot) or not. Root application of Leafamine^® increased the shoot fresh biomass of both well-watered (+40%) and deficit-irrigated (+20%) lettuce plants because the projected leaf area increased. Our results also indicate that Leafamine^® application could adjust the nitrogen metabolism by enhancing the total nitrogen content, amino acid (proline) contents and the total protein level in lettuce leaves, irrespective of the water condition. Osmolytes such as soluble sugars and polyols, also increased in Leafamine^®-treated lettuce. Our findings suggest that the protective effect of Leafamine is a widespread change in plant metabolism and could involve ABA, putrescine and raffinose.