施用生物质炭对土壤腐殖质组成和胡敏酸结构特征影响

为研究玉米秸秆生物质炭施用后土壤腐殖质组成和土壤胡敏酸结构的变化,选择腐殖质组成修改法和国际腐殖质协会推荐的方法进行土壤腐殖质组分提取和HA样品纯化,采用重铬酸钾外加热法和TOC分析仪测定土壤、水溶性物质(WSS)、富里酸(FA)、胡敏酸(HA)和胡敏素(Hu)有机碳含量,采用元素组成和红外光谱分析HA的结构变化.研究结果表明:施入玉米秸秆生物质炭后,表层和亚表层土壤及其腐殖质组分有机碳含量均有不同程度的提高,表层土壤、WSS、FA、HA和Hu有机碳含量增加幅度较大,分别增加了83.61%、112.50%、89.63%、91.78%和89.82%,说明玉米秸秆生物质炭的施用更有助于表层土壤有机碳的积累;PQ值(HA在腐殖酸中的比例)略有增加;土壤HA的缩合程度和芳香性增强,氧化度降低.此外,施用玉米秸秆生物质炭后,土壤及其腐殖质组分有机碳含量随土层深度的增加而降低,与表层相比,亚表层土壤、WSS、FA、HA和Hu有机碳含量分别下降了62.84%、52.94%、62.38%、66.62%和61.61%;土壤PQ值略有降低;土壤HA的缩合程度和芳香性降低,氧化度增加.     

Inter-provincial responsibility allocation of carbon emission in China to coordinate regional development

Environmental Science and Pollution Research - To establish the carbon emission trading scheme and achieve the carbon emission reduction goals in China, it is critical to allocate the carbon...     

Bioremediation of tetramethyl thiuram disulfide and resource utilization of natural rubber wastewater by WR-2 Bacillus-dominated microbial community

Environmental Science and Pollution Research - Tetramethyl thiuram disulfide (TMTD), an emerging pollutant with ecotoxicity and accumulation in rubber wastewater, is directly discharged by...     

Assessing the impact of mechanism of green public consumption policy on environmental equity: evidence from China

Environment, Development and Sustainability - This study investigates the impact of the mechanism of green public consumption policy on environmental equity and provides a feasible reference for...     

Does foreign private investment affect the clean industrial environment? Nexus among foreign private investment,CO2 emissions,energy consumption,trade openness,and sustainable economic growth

Environmental Science and Pollution Research - This study examines to what extent foreign private investment (FPI) affects the clean industrial environment and sustainable economic growth through...     

Versatile superhydrophobic bismuth molybdate cotton fabric for oil/water separation and decompose dyestuff

Water pollution caused by the discharged insolubility petroleum contaminants and organic compound dyes seriously threatens the natural self-purity capacity of the water body and the survival of aquatic species, so it is imperative to restraint the deterioration of the aquatic environment. In this paper, pathways are propounded for the simultaneous removal of insoluble spilling oil and organic dye contaminants. Particularly, hydrophobic ZnSnO₃ after stearic acid modification and Bi₂MoO₆ photocatalysts are introduced into the cotton fabric substrate through solution dip-coating. The durability of the prepared fabric suffers from the acid–base corrosion, thermal treatment and mechanical wear, while still exhibiting remarkable water-repellent (WCA?>?150°) property. Furthermore, the remarkable photocatalytic activity makes it possible for reusable degradation and the primary active species, namely the holes, to be verified by the radicals-capturing experiment. It is worth observing that as-prepared superhydrophobic fabric possesses admirable water-proof property and cycling durability of decomposing toxic water-soluble organic dye, thereby contributing to further realizing the ecological concept of clear waters.

     

Pricing-decision analysis of green supply chain with two competitive manufacturers considering horizontal and vertical fairness concerns

Environmental Science and Pollution Research - A pricing-decision analysis is a critical aspect of supply chain management since it directly affects manufacturers’ and retailers’...     

超稠油污水深度处理工艺技术

针对辽河油田超稠油污水的特点设计了处理工艺流程,进行了药剂的筛选,根据各工艺设备的出水水质要求确定了合适的净水剂、除硅剂、阻垢剂的加量,并进行了现场实际应用,外输出水达到锅炉给水指标要求,用于锅炉注汽使用,效果良好,分析了该超稠油污水处理技术的特点和优势,提出了超稠油污水回用锅炉的建议。     

海洋平台桩腿周围局部冲刷及其对基础承载力的影响∗

在海洋平台桩靴基础安装施工过程中，容易发生穿透现象而导致破坏。业界建议可通过在桩靴周边加设向上的袖结构来抑制贯入时周围土体的回流，从而缓解穿透破坏。但这种袖结构的存在会导致局部冲刷，形成的冲刷坑会减小桩靴有效埋深，进而影响其使用期的承载力。通过一系列水槽试验，探讨了不同形式桩腿的面积比、开孔率、来流角度等因素对于冲刷坑形状的影响，进而开展了考虑冲刷坑影响的桩靴基础承载力数值计算，并与忽略最大冲刷深度以上土体的传统模型、假设冲刷坑为倒圆台状的简化模型计算结果进行了对比。主要研究结果如下：（1）加设圆形袖结构的桩腿引起的冲刷深度要比方形袖结构桩腿小，建议工程中采用面积比较小的圆形袖结构来缓解穿透破坏；（2）桩腿的面积比、开孔率、来流角度等因素对冲刷坑形状都存在影响。最大冲刷深度随着开孔率的增大而减小，当开孔率较大时，冲刷现象近似于群桩冲刷，出现随着冲刷角度的增大冲刷深度先增大后减小的现象；（3）当考虑冲刷坑对于桩靴承载力的影响时，简化模型能够合理反映冲刷坑对于桩靴基础承载力的影响。