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为了解决微米铁的重力沉降问题,提高微米铁修复地下水Cr(Ⅵ)污染的原位修复效果,本文利用黄原胶对微米铁进行改性,并通过沉降实验探究改性微米铁浆液的稳定性,同时选择Cr(Ⅵ)作为目标污染物,探究黄原胶改性微米铁去除地下水Cr(Ⅵ)污染的降解能力。实验结果显示:当黄原胶的投加质量浓度分别为0.0、1.0、1.5、2.0、2.5、3.0、6.0 g/L时,改性微米铁浆液的悬浮稳定性逐渐得到加强,在5 h沉降实验结束时,对应的相对分光光度值分别为0.05、0.25、0.46、0.57、0.65、0.73和0.87;黄原胶具有抑制微米铁吸附Cr(Ⅵ)的能力,其可促进Cr(Ⅵ)的还原,提高Cr(Ⅵ)的去除率;随着黄原胶投加质量浓度的增加,对应的Cr(Ⅵ)去除率分别为33.4%、41.2%、47.4%、51.1%、53.0%、63.9%和64.1%;6.0 g/L黄原胶改性的微米铁浆液具有最佳的悬浮稳定性,黄原胶的投加提高了微米铁的反应活性,但当黄原胶投加质量浓度超过3.0 g/L时,其对Cr(Ⅵ)的去除率没有显著提高;黄原胶投加质量浓度越大,黄原胶的缓冲作用就越明显。 相似文献
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在伊朗卡尔赫水电站坝址工程勘察中,采用金刚石双管单动钻具和SM胶冲洗液进行取样钻探,用清水钻进压水试验,由于钻探工艺合理,钻探质量均达到了设计要求。 相似文献
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ABSTRACTThis paper presents the effectiveness of xanthan gum (XG) biopolymer in stabilising the expansive soil. The XG biopolymer is mixed with expansive soil in different proportions such as 0%, 0.2%, 0.5%, 0.8% and 1.0% by weight of the dry soil mass. The plasticity, compaction, swelling, compressibility, hydraulic conductivity, strength and durability characteristics of the treated and un-treated expansive soil are examined. Results show that the plasticity index of the treated soil mass initially increases but beyond 0.5% biopolymer addition it decreases sharply. The optimum moisture content and maximum dry density of treated soil, found out from light and heavy compaction tests, do not follow any definite trend. It is also found that increasing XG content increases compressibility slightly but, it reduces swelling pressure, differential free swelling value and hydraulic conductivity remarkably. On the other hand, time-dependent compressive strength and resistance to mass loss increases with increasing XG content. Microscopic examination confirms the formation of gel-like linkage, which brings about the modifications in the treated expansive soil. 相似文献
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阐述了改性聚乙烯醇胶水的制备工艺,并以此作彩粒成型剂,应用羟乙基纤维素———膨润土复合增稠剂作抗沉剂和稳定剂,与苯丙乳液等成膜剂、无机颜料等制成无毒、阻燃的水性多彩涂料。 相似文献
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针对地质钻探小井眼条件下失返性漏失堵漏技术难题,开展了适用于地质钻探堵漏要求的聚合物交联凝胶研究。采用单因素优选法,优选了交联凝胶体系用各种处理剂,并以环保型植物胶GJ为成胶剂,加入交联控制剂N1及交联剂1号等组分,研制了一种延迟交联凝胶。该凝胶在广西某铀矿勘查ZK6-37-1孔堵漏成功应用,解决了2个孔段失返性漏失问题。研究结果表明,该凝胶具有交联时间可控(交联时间10~75 min)以及较高的凝胶强度(承压≥6 MPa),在解决失返性漏失方面具有广阔的应用前景。 相似文献
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AbstractMaintaining and restoring the ecological integrity of floodplains remains a priority for many Australian federal and state government agencies. The Murray-Darling Basin Authority (MDBA) introduced the Proposed Basin Plan 2012, the Australian government’s latest basin-scale water planning instrument to promote a healthy, working river system. The proposal seeks to limit surface water (consumptive) use to 10 873 GL year-1 on a long-term average. The controversy prompted by this proposed reduction has underscored a need for rigorous and transparent modelling of ecological benefits. In this paper, we investigate the likely ecological outcomes of the proposal for Yanga National Park, one of the most significant environmental assets in the Murray-Darling Basin, using a decision support system. Our results indicate that the proposal will increase the inundation extent with a 33% (or 7000 ha) increase in median flood. The increase in inundation would improve the hydrological conditions in most wetlands in terms of the frequency and duration of events and inter-flood dry periods and enhance the habitat quality for a range of biota, though benefits are not distributed evenly across the wetland.
Editor D. Koutsoyiannis; Guest editor M. AcremanCitation Wen, L. and Saintilan, N., 2014. Linking local ecological outcomes with basin-wide water planning: a case study of Yanga National Park, an important Australian inland forested wetland. Hydrological Sciences Journal, 59 (3–4), 904–915. 相似文献
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