Ru-Ta/Ti阳极电解深度处理垃圾渗滤液

采用Ru-Ta/Ti三元电极为阳极,以不锈钢电极为阴极对垃圾渗滤液生物处理出水进行了电解处理研究,以COD为控制指标.重点研究了电解电压、电解时间、pH值、曝气量、电解质的添加等因素对电解处理效果的影响.研究结果表明:电压为7 V、处理时间为30 min、pH=9、曝气量为0.04m3/h、添加电解质为MnⅡ的条件下电...     

乳品废水活性污泥沉降特性研究

针对活性污泥法处理乳品工业废水过程中产生大量活性污泥的现状,研究不同温度、pH和沉降时间对活性污泥沉降的影响,旨在阐明活性污泥沉降性能的最佳条件,最大限度降低活性污泥在污水处理系统中所占的体积。试验结果表明当污泥沉降时间为120 m in时,pH6.0,35℃条件下污泥沉降体积为54%;pH7.0,45℃条件下污泥沉降比为54%;pH8.0,45℃污泥沉降体积比为55%;pH9.0,55℃条件下污泥沉降体积为52%;pH 10.0,5℃、15℃、25℃、35℃、45℃和55℃条件下污泥沉降体积比相近,均在60%以上。结合乳品废水处理的实际情况,pH6.0~9.0,温度35℃~55℃,污泥沉降时间为120 m in,污泥沉降效果较好,体积比可达到52%~54%。     

规划方案下清洁发展机制介绍与评价

规划方案下清洁发展机制（PCDM）,作为完善现有清洁发展机制（CDM）而提出。PCDM通过形成规模效益,推动社会向低碳经济转型,并进一步为发展中国家参与CDM提供机会,PCDM的改进最突出的体现于对技术转让的设计上。因此,本文在简要介绍PCDM的基础上,对PCDM分析评价。提出如何选择适合开发PCDM领域,并指出PCDM在技术引进中的作用。     

活性污泥中细菌的分离及其生理生化特性研究

从乳品废水活性污泥中分离纯化细菌,并进行生理生化特性、药敏试验研究。结果表明,H-1菌株分解葡萄糖产酸,利用乳糖、蔗糖、甘露醇等碳源;H-1菌株对头孢菌素类、氨基苷类、大环内酯类药物敏感;而对青霉素类、磺胺类等具有不同程度的耐药性。该研究对改善乳品废水活性污泥微生态、环境污染治理等具有科学指导意义。     

Manganese concentrations in maternal–infant blood and birth weight

Manganese (Mn) is an essential mineral nutrient in mammals. The physiological role of Mn in animal models is well documented, but little is known about the adverse effects of Mn deficiency or overexposure in humans, including pregnancy outcomes such as birth weight. We examined the relationship of the maternal and cord blood Mn levels with birth weight in a cohort of 172 mother–infant pairs born in Shanghai, China. Non-linear spline and quadratic regression models were used to test the hypothesis of an inverted U-shaped association between the Mn levels and birth weight. The median (range) levels of Mn in the maternal and cord blood were 5.38 (2.34–30.37) μg/dL and 7.66 (2.57–34.23) μg/dL, respectively. An inverted U-shaped relationship was observed between maternal Mn and birth weight after adjusting for potential confounders. The birth weight increased with Mn levels up to 4.18 μg/dL, and a slight reduction in weight was observed at higher levels. The cord blood Mn levels were not found to be associated with birth weight. Both lower and higher Mn exposures are associated with lower birth weight, which may influence important developmental parameters; the association of higher Mn levels with lower weight was weak and imprecise.     

Medium optimization for the production of anti-cyanobacterial substances by Streptomyces sp. HJC-D1 using response surface methodology

Bioremediation using isolated anti-cyanobacterial microorganism has been widely applied in harmful algal blooms (HABs) control. In order to improve the secretion of activated anti-cyanobacterial substances, and lower the cost, a sequential optimization of the culture medium based on statistical design was employed for enhancing the anti-cyanobacterial substances production and chlorophyll a (Chl a) removal by Streptomyces sp. HJC-D1 in the paper. Sucrose and KNO₃ were selected as the most suitable carbon and nitrogen sources based on the one-at-a-time strategy method, and sucrose, KNO₃ and initial pH were found as major factors that affected the anti-cyanobacterial ability of the isolated stain via the Plackett–Burman design. Based on the response surface and canonical analysis, the optimum condition of culture medium was obtained at 22.73 g l^-1 of sucrose, 0.96 g l^-1 of KNO₃, and initial pH 8.82, and the Chl a removal efficiency by strain HJC-D1 increased from 63?±?2 % to 78?±?2 % on the optimum conditions.     

Quantifying interactions between propranolol and dissolved organic matter (DOM) from different sources using fluorescence spectroscopy

Beta blockers are widely used pharmaceuticals that have been detected in the environment. Interactions between beta blockers and dissolved organic matter (DOM) may mutually alter their environmental behaviors. To assess this potential, propranolol (PRO) was used as a model beta blocker to quantify the complexation with DOM from different sources using the fluorescence quenching titration method. The sources of studied DOM samples were identified by excitation–emission matrix spectroscopy (EEMs) combined with fluorescence regional integration analysis. The results show that PRO intrinsic fluorescence was statically quenched by DOM addition. The resulting binding constants (log K _oc) ranged from 3.90 to 5.20, with the surface-water-filtered DOM samples claiming the lower log K _oc and HA having the highest log K _oc. Log K _oc is negatively correlated with the fluorescence index, biological index, and the percent fluorescence response (P _i,n) of protein-like region (P _I,n) and the P _i,n of microbial byproduct-like region (P _II,n) of DOM EEMs, while it is correlated positively with humification index and the P _i,n of UVC humic-like region (P _III,n). These results indicate that DOM samples from allochthonous materials rich in aromatic and humic-like components would strongly bind PRO in aquatic systems, and autochthonous DOM containing high protein-like components would bind PRO more weakly.     

基于HJ卫星混合像元分解法的湖北省四湖地区夏收作物种植信息提取

混合像元是造成中低空间分辨率遥感数据计算机解译不准确的主要原因，通过收集2013年四湖地区夏收作物生长期内的不用生育时期的三景HJ卫星CCD数据，生成一个15波段的“类高光谱”数据；在采用阀门技术结合夏收作物NDVI指数变化特点，提取所有夏收作物（小麦与油菜）在四湖地区的空间分布的基础上，成功运用改进的逐步回归法计算出小麦与油菜在混合像元中的丰度值，高精度地取得了四湖地区小麦、油菜种植区的空间分布；将部分结果与同期资源三号卫星融合数据作为标准进行比较，证明基于改进的逐步回归法计算混合像元的丰度值是比较准确的，为运用HJ卫星CCD数据高精度提取农作物种植信息提供了一种可行的方法     

Study on the denitrification performance of FexLayOz/activated coke for NH3-SCR and the effect of CO escaped from activated coke at mid-high temperature on catalytic activity

Currently, activated coke is widely used in the removal of multiple pollutants from industrial flue gas. In this paper, a series of novel Fe_xLa_yO_z/AC catalysts was prepared by the incipient wetness impregnation for NH₃-SCR denitrification reaction. The introduction of Fe-La bimetal oxides significantly improved the denitrification performance of activated coke at mid-high temperature, and 4% Fe_0.3La_0.7O_1.5/AC exhibited a superior NO_x conversion efficiency of 90.1% at 400 °C. The catalysts were further characterized by BET, SEM, XRD, Raman, EPR, XPS, FTIR, NH₃-TPD, H₂-TPR, et al., whose results showed that the perovskite-type oxide of LaFeO₃ and oxygen vacancies were produced on the catalysts’ surfaces during roasting. Fe-La doping enhanced the amount of acid sites (mainly Lewis and other stronger acid sites) and the content of multifarious oxygen species, which were beneficial for NO_x removal at mid-high temperature. Moreover, it was investigated that the effect of released CO from activated coke at mid-high temperature on the NO_x removal through the lifetime test, in which it was found that a large amount of CO produced by pyrolysis of activated coke could promote the NO_x removal, and long-term escaping of CO on the activated coke carrier did not have a significant negative impact on catalytic performance. The results of the TG-IR test showed that volatile matter is released from the activated coke while TG results showed that the weight loss rate of 4% Fe_0.3La_0.7O_1.5/AC only was 0.0015~0.007%/min at 300–400 °C. Hence, 4% Fe_0.3La_0.7O_1.5/AC had excellent thermal stability and denitrification performance to be continuously used at mid-high temperature. Finally, the mechanisms were proposed on the basis of experiments and characterization results.

     

Effects of intercropping with floricultural accumulator plants on cadmium accumulation in grapevine

Environmental Science and Pollution Research - Grapevine (Vitis vinifera L.) intercropping with floricultural cadmium (Cd) accumulator plants (Helianthus annuus L., Cosmos sulphureus Cav., Cosmos...