燃煤锅炉烟气中SO_3的生成、危害及控制技术研究进展

SO_3是燃煤锅炉烟气中的污染物之一,会造成烟气酸露点升高、空气预热器堵塞腐蚀、"烟羽"现象等,并且降低选择性脱硝催化剂的活性和锅炉的脱汞效率,危害设备安全和大气环境。介绍了燃煤锅炉中SO_3的主要生成途径、危害、控制方法以及SO_3的控制政策。用于燃煤锅炉中SO_3的控制方法有降低燃煤硫含量,采用ROFA燃烧技术,炉内喷碱性吸收剂,炉后喷碱性吸收剂,除尘器前喷氨和使用湿式电除尘器等。     

石油钻井废水处理研究进展

本文简述了处理石油钻井废水的研究现状,综述了常用的处理方法并对各种方法适用的范围以及优势和不足进行了分析。     

盐雾试验方墨探讨

分析了不同盐雾试验方法标准对盐溶液配制、试样的处理和检测、试验参数、试验过程控制等方面的不同要求,探讨了盐雾试验的操作技术,提出了必须严格控制盐雾试验过程的建议和不能用不同标准进行的盐雾试验结果进行比较的观点.     

试论ISO11014-1应增设有关理化参数

提出了在执行国际标准ＩＳＯ１１０１４－ １ 即化学品安全技术说明书的数据模式中应增设可燃液体的燃烧速率、比热和蒸发潜热等理化参数,并阐述了增设的必要性、作用、对策及建议。     

油田采油注入水处理技术

介绍了中原油田注入水水质特点,以前采用的处理工艺和存在的问题,并分析了问题的根源在于产出水的“四高一低”,原处理工艺难以去除。针对这一情况,中原油田与江汉石油学院合作开发研制了三组分水质调整剂,分别调整ｐＨ,破坏液体的稳定性并去除液体中的金属离子;他们对三种组分的加入时间和投加量进行了试验,结果表明：三种组分应按顺序加入,其中Ａ、Ｂ剂应有足够的间隔,加入量根据不同水质由试验确定。通过中原油田水处理站的运行试验得出结论：该工艺简单,投资小,处理效果好,适合中原油田的水质特性;处理后的水水质稳定,有效控制了腐蚀,减少了穿孔损失和污染损失,取得了显著的社会效益和环境效益     

DOM-Flocculation: A suitable approach for separating free and DOM-bound herbicides?

Dissolved organic matter (DOM) in soil solution is considered to interact with herbicides enhancing their mobility and promoting subsequent leaching. Batch experiments were conducted to test if free and DOM-bound herbicides can be separated by a DOM-flocculation technique with Cu as a coagulant. DOM was extracted from the H and A horizons of two soils (Terric Histosol, Cumuli-Calcaric Cambisol) and from the O horizon of a forest soil (Humic Cambisol). DOM-solutions (100 mL) were fortified with the herbicides terbuthylazine and pendimethalin (100 μg active ingredient each) and equilibrated for 14 hours. After DOM-flocculation with Cu (addition of 0,5 mM CuCl₂) herbicide recovery was determined in the supernatant solutions and in the precipitate of Humic Cambisol-DOM, respectively. Recovery of the herbicides from pure water was 85–99% and was not influenced by the addition of Cu. At low pH (4,8–5,3) DOM-flocculation of different DOM-extracts was insufficient and varied in a range of 18 – 90%. Herbicide recovery from DOM-solutions decreased moderately for terbuthylazine (60–90%) and strongly for pendimethalin (5 – 30%). In general, the addition of Cu caused no further reduction of herbicide recovery from supernatant solutions, except for Humic Cambisol-DOM. The effects of Cu-addition were most evident for pendimethalin (strongly reduced concentration in the supernatant solutions) and were considered to be caused by a flocculation of DOM-bound moieties. Flocculation of Humic Cambisol-DOM increased from 18 – 24% at pH 5 to > 95% at pH 8. However, at this pH the formation of Cu(OH)₂ as a sorbing subcomponent of the flocculated matter lead to an overestimation of DOM-bound pendimethalin. Calculating this side effect 6% of pendimethalin added was DOM-bound. Only traces of terbuthylazine (< 1%) were found in the solid matter of flocculated Humic Cambisol-DOM. To sum up, the new approach to separate freely dissolved herbicides from DOM-bound moieties not fully corresponded to our expectations. DOM-flocculation was found to depend strongly on pH-environment influencing not only DOM-herbicide interactions but also the clear separation of DOM-bound herbicides from herbicides in solutions.     

气浮净水技术研究及进展

本文系统总结了目前气浮净水技术的研究现状,着重阐述了溶气气浮机理及气浮池的设计、影响气浮效果的因素、气浮技术的评价及应用现状,同时对有关溶气气浮技术的模型及新概念,以及溶气气浮技术的发展方向进行了论述。     

辐射技术在水处理中的应用及其发展

介绍了水处理辐射技术的分类、处理机理及其特点;概括了辐射技术在水处理中的应用情况;分析了辐射技术在水处理中的发展趋势。     

清水塘地区土壤重金属污染现状及修复技术研究

阐述了清水塘地区土壤和农作物重金属污染现状,提出了对受污染土壤的修复措施及土地利用构想。     

鲴鲢鳙混养系统中微生物对氮素迁移转化的影响

通过实验室模拟富营养化水体进行鲢(Hypophthalmichthys molitrix)鳙(Aristichthys nobilis)鲴(Plagiogathops micrloepis Bleeker)混养,结合同位素标记与微生物检测,研究其中沉积物微生物群落的变化及其对氮素迁移转化的影响,揭示鲢鳙鲴混养作用机制....