Combined inverse modeling approach and load duration curve method for variable nitrogen total maximum daily load development in an agricultural watershed

Purpose  

Nonpoint sources (NPS) pollution has been an important cause for water quality impairment worldwide. To take the temporal variations of both NPS pollution and in-stream attenuation into consideration, an inverse modeling approach and the load duration curve (LDC) method were combined for variable nutrient total maximum daily load (TMDL) development.     

嗜麦芽窄食单胞菌对镉的吸附

利用从重金属镉污染地分离并纯化得到的1株嗜麦芽窄食单胞菌(Stenotrophomonas maltophilia)作为吸附剂,考察了镉初始浓度、菌浓度、吸附时间、温度及pH对镉吸附效果的影响.结果表明,在镉初始质量浓度为1.0 mg/L、30℃、pH为6～7条件下,菌质量浓度为2.0 g/L时,吸附120 min对镉...     

IC反应器处理MTO废水的中试研究

中试研究了内循环(IC)反应器处理甲醇制烯烃(MTO)废水的启动和运行过程,同时考察了颗粒污泥的性状及沼气产量的变化情况。试验过程运行稳定,系统抗冲击性强。以絮状污泥为接种污泥,经过131 d的启动和运行,IC反应器的COD去除负荷可达10 kg/(m~3·d)以上,COD去除率可达90%以上。IC反应器中的成熟颗粒污泥形状规则、密实、粒径大、沉降速率快。IC反应器的沼气产量符合理论预期。     

跌落条件下箱装弹药关键部件冲击加速度的数值模拟

为正确评估跌落冲击对弹药安全性的影响,合理设计弹药参数及包装结构,科学指导弹药勤务处理,将引信元件定义为关键部件,采用有限元分析软件ANSYS/LS-DYNA对箱装弹药跌落过程进行计算机仿真,模拟跌落条件下作用于引信元件处的冲击加速度值,并且通过试验验证了仿真模型的可靠性.     

煤基活性炭生产与再生研究

对煤基活性炭生产过程中的炭化、活化机理进行了简单的论述,分析了制备工艺中影响煤基活性炭质量的各种因素,从经济和环保角度出发,介绍了活性炭再生及其评价方法.最后,根据活性炭应用领域的不断扩大,介绍了我国活性炭生产的发展趋势..     

基于模糊影响图方法的库存弹药事故概率分析

针对库存弹药安全的特殊性,在分析国内外库存弹药典型事故案例的基础上,指出FTA、ETA等传统概率计算方法存在的局限。提出一种基于模糊影响图(FID)的库存弹药事故概率分析方法,并对FID模型的构建过程和算法进行概述;以弹药被盗事故作为实例分析,并得到事故概率分布图和累积概率曲线。结果表明,FID的算法理论及建模过程能较好地克服FTA、ETA等传统方法的局限性,实例分析指出弹药被盗事故在10-4数量级的隶属度最高,且事故发生概率更趋向于10-3～10-1数量级,从而得到一旦仓库安全防范措施不到位,就很有可能发生弹药被盗事故的结论。     

占领产业高端延伸经营链条实现立体发展——天津市供销合作总社构建废旧商品回收利用体系的调研与思考

废旧商品回收利用是供销社传统经营产业.经过近几年的努力,天津市供销合作总社跳出传统的发展模式,进行了积极探索和大胆实践.强化市场主导地位,实现了产业的深度经营、优化升级和规模发展,在天津循环经济领域占据了重要地位.     

Using biochar for remediation of soils contaminated with heavy metals and organic pollutants

Soil contamination with heavy metals and organic pollutants has increasingly become a serious global environmental issue in recent years. Considerable efforts have been made to remediate contaminated soils. Biochar has a large surface area, and high capacity to adsorb heavy metals and organic pollutants. Biochar can potentially be used to reduce the bioavailability and leachability of heavy metals and organic pollutants in soils through adsorption and other physicochemical reactions. Biochar is typically an alkaline material which can increase soil pH and contribute to stabilization of heavy metals. Application of biochar for remediation of contaminated soils may provide a new solution to the soil pollution problem. This paper provides an overview on the impact of biochar on the environmental fate and mobility of heavy metals and organic pollutants in contaminated soils and its implication for remediation of contaminated soils. Further research directions are identified to ensure a safe and sustainable use of biochar as a soil amendment for remediation of contaminated soils.     

吴忠黄河公路大桥建设对滨河湿地的影响及保护措施研究

跨河大桥的建设对社会和经济的发展具有促进作用,但同时也会影响环境。正在建设的吴忠黄河公路大桥穿越吴忠滨河湿地,会对湿地的生态环境产生影响。文章介绍了吴忠黄河公路大桥和滨河湿地的基本概况,分析了大桥建设和营运对滨河湿地环境的影响,并提出了滨河湿地生态环境保护措施。     

重庆银莲花属药用植物资源研究

经调查鉴定,重庆银莲花属药用植物有10种4变种。重点介绍了其医疗用途、地理分布、资源状况及其开发前景,为进一步开发利用我市丰富的银莲花属植物资源提供了科学依据。