济阳坳陷牛庄洼陷南斜坡原油成熟度浅析

从定性和绝对定量角度对济阳坳陷牛庄洼陷南斜坡原油、烃源岩可溶物烃类组成进行了详细剖析 ,重点从定性和定量角度对该区“未熟 低熟油”的成熟度进行了讨论。结果表明 ,依据最新确认的未熟 低熟油界定标准 ,牛庄洼陷南斜坡八面河等油田原油的定量成熟度参数已达到成熟油的范畴 ;标样定量分析表明 ,原油中粪甾烷、13α ,14α三环萜烷等热稳定性低的生物标志物绝对丰度极低 ;原油C2 9甾烷ααα2 0S/ (S +R)的实际值高于测定值 ,未熟 低熟烃类的混入是导致原油甾烷异构化参数值大幅度降低和热稳定性低化合物检出的根本原因。定性和绝对定量的结合是识别原油成熟度高低的可靠途径     

组合工艺处理高浓度酚醛废水的研究

针对绝缘材料厂酚醛树脂生产废水高酚高醛的水质特点，研究了二次缩合-化学氧化-粉煤灰吸附组合处理工艺。结果表明，经该工艺处理后不仅出水酚含量可降至0．3mg／L以下，CODCr10．2mg／L左右，各项水质指标均达到了GB8978—96污水综合排放一级标准，同时还可回收一定数量的树脂。     

UV light tolerance and reactivation potential of tetracycline-resistant bacteria from secondary effluents of a wastewater treatment plant

Tetracycline-resistant bacteria (TRB) are of concern as emerging microbial contaminants in reclaimed water. To understand the effects of UV disinfection on TRB, both inactivation and reactivation profiles of TRB, as well as 16 tetracycline-resistant isolates from secondary effluent, were characterized in this study. The inactivation ratio of TRB was significantly lower (3.0-log) than that of heterotrophic bacteria (> 4.0-log) in the secondary effluent. Additionally, the proportion of TRB significantly increased from 1.65% to 15.51% under 20 mJ/cm² ultraviolet (UV) exposure. The inactivation rates of tetracycline-resistant isolates ranged from 0.57/s to 1.04/s, of which tetracycline-resistant Enterobacter-1 was the most tolerant to UV light. The reactivation of TRB, tetracycline-resistant isolated strains, as well as heterotrophic bacteria commonly occurred in the secondary effluent even after 20 mJ/cm² UV exposure. The colony forming ability of TRB and heterotrophic bacteria reached 3.2-log and 3.0-log under 20 mJ/cm² UV exposure after 22 hr incubation. The final inactivation ratio of tetracycline-resistant Enterobacter-1 was 1.18-log under 20 mJ/cm² UV exposure after 22 hr incubation, which is similar to those of TRB (1.18-log) and heterotrophic bacteria (1.19-log). The increased proportion of TRB and the reactivation of tetracycline-resistant enterobacteria in reclaimed water could induce a microbial health risk during wastewater reuse.     

不同 pH 浸提条件对生活垃圾焚烧炉渣重金属浸出影响研究

生活垃圾焚烧炉渣富集了大量重金属,对环境有严重影响。对生活垃圾焚烧炉渣以（ HJ／T 299－2007）硫酸硝酸法浸提,在不同的pH浸提条件下对炉渣中重金属浸出特性进行了实验研究。结果表明重金属浸出量随着浸出pH的下降有明显上升趋势,尤其在酸性条件下有明显提升。炉渣在酸雨长期浸泡下会浸出大量重金属,对周边土壤及地下水造成严重影响。     

电催化氧化中的三种催化材料处理酸性红B染料的比较研究

本文采用三种不同催化机理的材料———半导体材料TiO2 、软锰矿石和混合稀土进行了电催化氧化 (ECO)染料酸性红B的研究 ,结果表明 ,稀土材料在ECO体系中呈负催化效应 ;软锰矿石的色度去除催化效果明显 ;TiO2 的催化效果最显著 ,其色度和COD去除效果可比无催化剂时效果分别提高60 %和 75% ,可以作为电催化氧化的催化剂。并进一步研究了TiO2 用量对电催化氧化 (ECO)的影响。     

A mathematical model and mesh-free numerical method for contact-line motion in lubrication theory

Environmental Fluid Mechanics - We introduce a mathematical model with a mesh-free numerical method to describe contact-line motion in lubrication theory. We show how the model resolves the...     

Curcumin antagonizes inflammation and autophagy induced by arsenic trioxide through immune protection in duck spleen

Environmental Science and Pollution Research - Arsenic is a toxic heavy metal widely found in the natural environment and has adverse effects on the health of waterfowl and human. Curcumin (CUR), a...     

Spatiotemporal pattern of reference crop evapotranspiration and its response to meteorological factors in Northwest China over years 2000–2019

Agricultural irrigation water in Northwest China accounts for more than 80% of total local water consumption, which is 1.23 times that of China. However, Northwest China is the most water-scarce place in China. Water scarcity in restricts crop growth and production. Reference crop evapotranspiration (ET₀) is important for agricultural water management. Understanding the reason for ET₀ change is helpful to provide a basis for rational planning of agricultural irrigation systems to conserve water. This study investigated the temporal and spatial variation characteristics of ET₀ at 181 meteorological stations in Northwest China from 2000 to 2019. And the sensitive factors and dominant factors affecting ET₀ change were quantitatively identified based on sensitivity analysis and contribution rate evaluation. Results showed that (1) a significant increase in maximum and minimum temperature (T_max and T_min), a significant decrease in sunshine duration (SD) and relative humidity (RH), and a slight increase in wind speed at 10 m height (U₁₀) were observed. (2) Annual ET₀ had an insignificant increasing trend. Spring and autumn ET₀ contributed greatly to the growth of annual ET₀, especially in March, May, September, October, and November. ET₀ in HH (Yellow River Basin area) had decreased at annual scale, while other subregions were the opposite trend. Significant differences in monthly and seasonal changes in the spatial distribution of ET₀. (3) U₁₀ was the dominating contribution factor related to annual ET₀ variability, followed by T_min, RH, T_max, and SD. In seasonal time scale, T_min, SD, U₁₀, and RH were the most dominant factors in spring, summer, autumn, and winter respectively. (4) Spatial distribution for contribution rates of various meteorological factors showed significant diversity among various subregions. The positive contribution of U₁₀ was the major cause of the increase in ET₀ in semi-arid grassland area (BGH), the southwest of “Qice line” (QCXXN), and the southeast of “Qice line” (QCXDN); the significant increase in T_min contributed most in Qaidam Basin (CDM), Hexi inland river basin (HX), the northeast of “Qice line” (QCXDB), and the northwest of “Qice line” (QCXXB), while the contribution of decreasing SD offsets the positive effects of other factors, leading to the decrease in ET₀ in HH. Our work illustrates that water management measures should be different at different spatial and temporal scales. The effect of U₁₀ can be offset by covering, to reduce evaporation and maintain water in BGH, QCXXN, and QCXDN. And high-temperature resistant varieties are planted to adapt to temperature growth in CDM, HX, QCXDB, and QCXXB. Agricultural water management strategies should be formulated and selected according to local conditions.

     

Integrated toxicity assessment of DEHP and DBP toward aquatic ecosystem based on multiple trophic model assays

Environmental Science and Pollution Research - To comprehensively understand the toxic risks of phthalates to aquatic ecosystems, we examined the acute toxicity of di-(2-ethylhexyl) phthalate...     

火电厂烟气脱硫工程的调试技术服务

电厂烟气脱硫工程的调试是一门新课题。本文就如何掌握其系统性、规律性及如何建立验评体系进行了探索。