共查询到20条相似文献，搜索用时 890 毫秒
1.
拉萨夏季降水中氧稳定同位素变化特征 总被引：17，自引：7，他引：17
根据青藏高原拉萨气象站１９９３～１９９６年雨季降水中δ１８Ｏ的测量和ＩＡＥＡ／ＷＭＯ的观测结果，分析了拉萨雨季降水中δ１８Ｏ的变化规律，以及与气温和降水之间的关系。受青藏高原季风的影响，拉萨降水季节变化异常明显，降水集中在夏半年，尤其是７～９月份。拉萨降水中δ１８Ｏ也表现出季风降水的典型特征。降水中δ１８Ｏ“雨量效应”明显，而且这种降水量的影响远远掩盖了气温对降水中δ１８Ｏ的作用。高降水对应降水中δ１８Ｏ低值，反之亦然。拉萨降水中δ１８Ｏ的这种变化特征与青藏高原北部是不同的。 相似文献
2.
新型混凝剂处理印染废水的实验研究 总被引：5，自引：0，他引：5
采用自行制各的具有不同SiO2:Al:Fe(摩尔比值)和碱化度的两类新型无机高分子混凝剂聚硅酸氯化铝铁(PSAFC)和聚硅酸硫酸铝铁(PSAFS）各7种，直接对印染废水进行处理。从中选出2种温凝剂，考察了pH值、混凝剂投量等对混凝效果的影响，并对混凝处理后，印染废水出水中残留温凝剂主要成分Al、Fe、SiO2的含量进行分析。实验结果表明，氯化物型(PSAFC)和硫酸盐型(PSAFS)混凝剂对印染废水的色度、浊度、COD Cr均有良好的去除效果；总体而言，PSAFS的混凝效果略优于PSAFC；混凝处理后印染废水出水中残留铝、铁、硅的含量均比较低；pH值和碱化度对温凝剂在水体中残留铝含量有影响。 相似文献
3.
高氟地下水混凝沉淀降氟试验研究 总被引：5，自引：0，他引：5
本文开展了山西运城地区高氟地下水的降氟试验，对聚铁、硫酸铝和明矾等不同混凝剂降氟效果进行对比，探讨了地下水硬度对混凝沉淀除氟效果的影响。实验结果表明：明矾混凝沉降效果优于其它混凝剂，0．3g／L的明矾溶液可使含氟浓度4．0mg／L的地下水降低到浓度1．0mg／L以下；地下水的硬度对明矾混凝降氟效果没有明显影响。 相似文献
4.
降水中δ＿（１８）Ｏ值的大小不仅受凝结温度的影响，而且受水汽源地初始状态、水汽输送方式、云中饱和状态和云中液态水含量（统称第二类因素）的影响。本文以与全球δ＿（１８）Ｏ实测值相吻合的参数为标准状况参数，模拟不同条件下的δ＿（１８）Ｏ值与标准状况下δ＿（１８）Ｏ值的差异。并且将影响降水中δ＿（１８）Ｏ值的作用分解成△δ＿１和△δ＿２两部分。它们分别代表取样点温度变化引起的δ＿（１８）Ｏ的变化和第二类因素变化引起的δ＿（１８）Ｏ值的变化。从而说明，第二类因素对降水中δ＿（１８）Ｏ值的影响是重要的。 相似文献
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ISE—FIA法测定水中NO^—3和NO^—2 总被引：1，自引：0，他引：1
依据ＫＭｎＯ４氧化ＮＯ＾－２为ＮＯ＾－３，使用自制ＩＳＥ－ＦＩＡ装置连续测定水中ＮＯ＾－３和ＮＯ＾２。方法快速，精密，准确。 相似文献
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影响青藏高原的天气系统与降水中氧同位素的关系 总被引：13，自引：9，他引：13
青藏高原的天气系统对降水中氧同位素比率的大小有重要的影响，在西风槽的影响下，降水中δ＾１８Ｏ与温度呈正相关关系；在切变线和高原低涡系统的影响下，高原季风区降水δ＾１８Ｏ与降水量和温度呈负相关，非季风区降水中δ＾１８Ｏ与温度仍呈正相关。 相似文献
7.
北京典型溶洞土壤中的CO2及其对岩溶作用的驱动 总被引：2，自引：0，他引：2
本文通过对北京万佛堂孔水洞观测站土壤ＣＯ２及泉水中ＨＣＯ＾－３等为期一年的观测资料的分析评价,得出结论：土壤中的ＣＯ２驱动着岩溶作用,表现在土壤中ＣＯ２含量的季节性变化－夏季土壤ＣＯ２含量和泉水中ＨＣＯ＾－３浓度也相应升高。 相似文献
8.
青藏高原现代降水中dδ^18O／dT的变化 总被引：3，自引：2，他引：3
不同时间尺度ｄδ＾１８Ｏ／ｄＴ的天气气候意义是不同的，其数值大小也是不一样的。本根据对青藏高原沱沱河、德令哈、西宁三站大气降水中δ＾１８Ｏ与温度关系的分析，并与具有长序列资料的地区进行比较。初步给出了青藏高原不同时间尺度ｄδ＾１８Ｏ／ｄＴ之间的差异。 相似文献
9.
谢宏英 《华北地质矿产杂志》1996,(2)
利用ＨＮＯ_３－ＨＣｌ体系消解法处理混浊水中的汞谢宏英（大同市环境监测站）进行水中汞测定时，按要求应摇匀后取样，因而样品十分浑浊。目前，冷原子荧光法测定河道水中的微量汞，统一方法是用高锰酸钾一过硫酸钾法消解制备试样。此法在测定前必须加盐酸羟胺还原过剩?.. 相似文献
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混凝法用于污水处理的实验研究 总被引：4，自引：2，他引：4
用混凝法处理洗浴污水，并把处理后的水作为中水回用。影响污水处理效果的因素有混凝剂的种类，混凝剂投加量，水力条件等方面。混凝法处理洗浴废水的最佳条件是：选择比较便宜易得的混凝剂（硫酸铝）采用适宜混凝剂浓度（5％），强化混凝反应强度和时间（强搅拌 较长的反应时间），投加适量的混凝剂（90mg/L)。在最佳试验条件下，可以使处理后的洗浴废水达到中水回用标准和生活杂用水标准。 相似文献
11.
硅酸盐细菌GY03菌株的絮凝特性 总被引：17，自引：1，他引：17
从土壤中筛选分离到一株硅酸盐细菌GY03菌株，对其絮凝特性进行了研究。结果表明，GY03菌株营养要求简单，在生长的同时合成胞外高聚物，具有良好的絮凝性能。GY03菌株所产絮凝物质有88％以上分布在细胞表面，该絮凝剂的絮凝活性随菌体生长量的增加而同步增高，不同金属离子对GY03菌株絮凝活性有影响。实验条件下，1h内GY03菌株所产生的微生物絮凝剂对高岭土悬浮液絮凝率为78％，经放置24h后最高絮凝率可达98％，对制药废水浊度去除率为78．1％～94．7％，COD去除率为48．0％-87．5％，生活污水浊度去除率为85．3％～92．5％，对墨汁溶液的脱色率为53．2％以上。因而认为该菌株是一种很有应用前景的絮凝剂产生菌。 相似文献
12.
H. Asilian M.Sc. Ph.D. Sh. Moradian fard M.Sc. A. Rezaei M.Sc. Ph.D. S. B. Mortazavi M.Sc. Ph.D. A. Khavanin M.Sc. Ph.D. 《International Journal of Environmental Science and Technology》2006,3(2):153-157
In this study acrylic water base color was removed from synthetic wastewater using coagulation process. Experiments were conducted on the sample containing 100 mg/L and 400 mg/L of acrylic water base color. Destruction of color by means of coagulation/flocculation techniques using ferrous sulfate, alum, lime and polyelectrolyte (cationic, anionic and non ionic). The study was performed in a systematic approach searching optimum values of alum and FeSO4 concentration, pH and temperature. All the experiments were run in a laboratory scale.The obtained results show that treatment with alum and ferrous sulfate alone proved to be very effective in removing the color (> 99 %) and part of COD (60–70 %) from aqueous solution. Lime alone did not significant change on COD and color removal. 相似文献
13.
简要介绍了纤维束过滤器的工作原理,针对原水水质及用户对水质的要求,设计了用纤维束过滤器去除黄河水浊度的处理工艺,提出了纤维束过滤器的运行参数,分析了纤维束过滤器对黄河水浊度的去除效果. 相似文献
14.
铝钛柱撑改性膨润土处理两种模拟废水的实验研究 总被引：10，自引：1，他引：10
以钠基膨润土为原料制备了铝钛无机柱撑、铝钛有机柱撑改性膨润土，确定了改性膨润土的最佳铝钛比和铝土比，并将其应用于模拟废水、化学实验室废水的处理。与原土进行比较，探讨了用量、pH值、搅拌时间等对COD去除率、色度去除率、浊度去除率的影响，通过正交实验对实验条件进行了优化。结果表明：有机柱撑改性膨润土、无机柱撑改性膨润土对废水的处理效果均明显好于原土，对废水色度、浊度的去除率均大于93％；对废水COD的去除效果，有机柱撑改性膨润土比无机柱撑改性膨润土有较大提高，去除率最高达66．31％，结果令人满意。 相似文献
15.
微生物絮凝剂研究和应用进展 总被引：15，自引：0，他引：15
微生物絮凝剂是由微生物产生的有絮凝活性的代谢产物．由于微生物絮凝剂具有降解性能好、应用广泛、成本低、操作简单及不会导致二次污染等优点，正日益引起人们的广泛重视。本文综述了微生物絮凝剂的开发现状和应用进展，系统介绍了微生物絮凝剂产生的条件、絮凝机理以及影响其絮凝活性的因素，着重列举了微生物絮凝剂在水处理领域中的应用实例。最后对微生物絮凝剂的发展趋势进行了展望。 相似文献
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Daily water samples have been collected at three stations in the North Inlet (South Carolina) marshestuary system since February 1981 as part of the NSF Long-Term Ecological Research (LTER) project. As a result of this sampling regime, nearly continuous time series of inorganic and organic suspended sediment, particulate organic carbon (POC), Secchi disk, salinity, and water temperature are now available. Power spectrum analysis of these data reveals that most of the explainable variance in the inorganic suspended sediment, POC, and Secchi disk data is related to a yearly cycle that is strongly coherent with water temperature such that high turbidity is associated with high water temperature. Only a small fraction of the explainable variance is associated with frequencies that can be related to the semidiurnal tide. Simple correlation analysis also indicates that turbidity is more closely associated with water temperature than with tide height or salinity. The ratio of POC to inorganic suspended sediment shows no discernible power spectra peaks and is weakly, but inversely, correlated with temperature. From these results we hypothesize that temperature-regulated bioturbation is the main factor controlling turbidity variations in the system. The lack of a strong inverse correlation between turbidity and salinity suggests that river runoff has little immediate impact on the suspended sediment of nearshore coastal waters in systems similar to North Inlet. 相似文献
18.
A. Jafari Dastanaie M.Sc. G. R. Nabi Bidhendi Ph.D. T. Nasrabadi R. Habibi M.Sc. H. Hoveidi P.hD. 《International Journal of Environmental Science and Technology》2007,4(3):379-382
In order to evaluate the feasibility of implementation of horizontal-flow roughing filtration for drinking water treatment a pilot was designed and run at the bank of Zayandehroud river near the village of Chamkhalifeh. Pilot running was performed in summer 2003 (July, August and September), when the quality of river water was in relatively worst condition. The filter is comprised from three different parts which are separated with perforated baffles. Each compartment is filled with some local sand and gravel considering a special decreasing size regime. The overall function of the filter in removing turbidity and total suspended solids is acceptable. Additionally, iron, manganese and color and coliform removal are also been covered to some extent. Achieved results in this study shows that horizontal-flow roughing filtration may be considered as a packed, low-cost and efficient pretreatment process incase surface water is used as water supply for treatment. Furthermore, when small scale societies are considered and when no major pollutants exist in the water supply as the case in this study_ this system may be posed as a total treatment system, in which treated water exited from the filter may be sent to distribution network after a simple post chlorination. 相似文献
19.
G. Masmoudi R. Trabelsi E. Ellouze R. B. Amar 《International Journal of Environmental Science and Technology》2014,11(4):1007-1016
Textile effluents are considered among the most polluted wastewaters all over the world. Among different textile processes, dyeing is the operation that produces the most important amounts of chemical pollution. Many studies have been carried out toward the treatment of these hazardous effluents, and a variety of techniques have been applied for this aim. In this work, the effluents coming from different steps of the dyeing cycle were treated following different mixtures of baths using membrane technology. Nanofiltration (NF) experiments were performed for color removal, but membrane fouling still a major limitation. To enhance NF performances, microfiltration (MF) was carried out as pretreatment to NF. The results showed almost above 99 % of color and turbidity removal and also an important decrease in COD, chloride and salts contents with an improvement in the MF and NF stabilized fluxes of different mixtures compared to that corresponding to the dyeing effluent treated separately. In order to accomplish a full reuse cycle, dyeing experiments were performed using the combined system (MF/NF) permeates. Results were evaluated regarding total color difference between samples and a standard test done with fresh water. 相似文献
