共查询到17条相似文献,搜索用时 140 毫秒
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无机高分子絮凝剂聚合氯化铁的制备与应用 总被引:1,自引:0,他引:1
综述了分别以氯化铁、硫铁矿烧渣和酸洗废液为原料制备无机高分子絮凝剂聚合氯化铁的方法,以及其在低浊度水、合成洗涤剂废水和印染废水等水处理方面的应用。指出了聚合氯化铁絮凝剂在制备及应用上的发展趋势。 相似文献
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山东省环境应急演练要求投放污染标示物进行真实性监测。为了保证演练顺利开展,选择三氯化铁作为污染标示物,在胜利河郭家桥—四马桥11.34 km河段进行了释放实验。实验结果证明三氯化铁做标示物是可行的,并对三氯化铁的释放流量、演练需用量和河段的沉降系数进行了确定。 相似文献
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杨立静 《中国环境管理干部学院学报》2002,12(1):40-41
以马来酸和正丁醇为原料,采用水合三氯化铁(以下称氯化铁)作催化剂合成马来酸二丁酯。经实验确定了酯化的优化条件,获得了97.63%的酯化率。 相似文献
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双波长K系数方程法同时测定水样中的砷和磷酸盐 总被引:1,自引:0,他引:1
双波长K系数方程法同时测定水样中的砷和磷酸盐,是指选定两个测定波长λ1、λ2,将磷酸盐、砷在λ2处的吸光度转化为λ1处的吸光度,列出一个二元一次方程组,解得磷酸盐、砷在λ1处的吸光度,进而求得水样中的磷酸盐、砷含量。 相似文献
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原子吸收法测定铜检出限的测量不确定度评估 总被引:1,自引:0,他引:1
对原子吸收法测定铜检出限的测量不确定度进行分析探讨,建立了不确定度的评估方法。影响铜检出限测量不确定度的主要因素包括标准溶液不确定度;拟合曲线不确定度;检测仪器不确定度;吸光值量化误差不确定度等,提供了上述各因素的计算方法及过程。 相似文献
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在含甲醇>60%的0.05~0.4N硫酸溶液中,偶氮膦Ⅲ与稀土元素形成紫色络合物,摩尔吸光系数视稀土不同分别为1.2×10~5—1.5×10~5,有两个吸收峰,分别位于665nm和615nm,其测定灵敏度高出水溶液3倍以上。用摩尔比法确定了络合物的组成为1:3。用萃取光度法可测定土壤中微量稀土元素。该法选择性好,灵敏度高,络合物的稳定性好。 相似文献
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在碱性溶液(pH10.4—11.1)中,钙离子与紫尿酸铵生成橙红色的稳定络合物,在500nm处有最大吸收,钙浓度在2.5—25μg/50ml范围内符合比尔定律,表观摩尔吸光系数为1.2×10~4L·mol~(-1)·cm~(-1),桑德尔灵敏度为0.003μg/cm~2。本法快速、准确、可靠,回收率为94—104%。 相似文献
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Toxic metals removal from wastewater sewage sludge can be achieved through microbial processes involving Acidithiobacillus ferrooxidans. The oxidation of ferrous ions by A. ferrooxidans, cultured in sewage sludge filtrate, was studied in both batch and continuous flow stirred tank reactors. Sewage sludge filtrate containing natural nutrients (phosphorus and nitrogen) was recovered as effluent following the dehydration of a primary and secondary sludge mixture. Batch and continuous flow stirred tank reactor tests demonstrated that A. ferrooxidans were able to grow and completely oxidize ferrous iron in a culture medium containing more than 80% (v v(-1)) sewage sludge filtrate with 10 g Fe(II) L(-1) added. Toxic levels were reached when total organic carbon in the sewage sludge filtrate exceeded 250 mg L(-1). The ferric iron solution produced in the sludge filtrate by A. ferrooxidans was used to solubilize heavy metals in primary and secondary sludge. The solubilization of Cu, Cr, and Zn yielded 71, 49, and 80%, respectively. This is comparable with the yield percentages obtained using a FeCl(3) solution. The cost of treating wastewater sewage sludge by bioproducing a ferric ion solution from sewage sludge is three times less expensive than the conventional method requiring a commercial ferric chloride solution. 相似文献
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In the search for a cheaper material to effectively condition sludge, oil-free moringa seed was prepared and tested. A Soxhlet
apparatus was used to extract the oil from moringa seed (Moringa oleifera). The oil-free seed (marc) has been found to have higher conditioning potential than the ordinary moringa seed. However,
the traditional ferric chloride is still a better sludge conditioner than moringa seed marc. For the digested domestic sludge
used, optimum conditioning dosages were found to be 0.6, 0.80, and 1.10% of the total solids for ferric chloride, marc of
the moringa seed, and ordinary moringa seed, respectively. Since little or no operational material is lost in the extraction
process, the moringa seed marc is a promising conditioner in place of the ordinary seed. 相似文献
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污泥热解残渣制备聚合氯化铝的实验研究* 总被引:1,自引:0,他引:1
含铝污泥热解或焚烧残渣制备聚合氯化铝的研究,有利于实现污水处理过程投加的铝盐絮凝药剂的回收与高效循环利用,减少污染物排放和资源消耗。针对辽河油田欢三联稠油污水处理污泥的热解残渣具有较高铝含量的特点,开展采用盐酸进行铝溶出及制备聚合氯化铝的实验研究。结果表明:焙烧温度为700~750℃,焙烧时间控制在1h即可。将经过焙烧活化的残渣在常温下进行酸溶,酸溶时间为2~5h,选用25%~30%盐酸,氧化铝与盐酸的摩尔比为1∶1.0~1∶1.2为宜。将溶出的铝溶液制备聚合氯化铝,在常温下采用CaO粉末来调节pH值为3.5,聚合反应时间为1d,即可得聚合氯化铝溶液。 相似文献
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In this study we developed and tested a spray method to visualize bromide water tracer in soil profiles. The method is based on the transformation reaction of a white precipitate into a colored one (Prussian blue) in the presence of Br-. After application of water containing bromide (0.2-0.4% wt.), a soil profile is dug out from the irrigated area and sprayed with a Br- indication suspension containing ferric ion and silver ferrocyanide precipitate. About two hours later, the pattern of irrigation water movement in the soil profile appears due to the formation of Prussian blue complex. We describe the method and demonstrate its use in a field experiment to visualize water flow paths. Since this method might be subject to possible interference from Cl-, a newly designed method with iodide ion as a water tracer and its indication solution containing soluble starch and ferric ion is also presented and recommended for use in soils with high chloride background. 相似文献
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中试试验对比PAC和PAFC处理低温饮用水的混凝性能 总被引:1,自引:0,他引:1
低温降低了混凝剂的混凝性能,为保持传统混凝沉淀工艺中低温条件下饮用水的出水水质,需要优选混凝性能更好的混凝剂。本试验选用了小试试验中性能更优的无机高分子复合混凝剂PAFC(聚合氯化铝铁)与无机高分子混凝剂PAC(聚合氯化铝)进行中试对比试验。试验结果表明铁铝复合混凝剂PAFC在低温条件下的混凝性能要优于铝盐PAC。使用PAFC时混凝澄清池的出水浊度能保持在3NTU以内,在0.55~2.87NTU之间变化。而使用PAC的出水浊度在1.44~3.87NTU之间。比较其他出水指标如色度、氨氮、pH、电导率、铁和CODM。后发现,当PAFC比PAC平均节省药剂12.3%时,PAFC的处理效果仍旧比PAC好。 相似文献
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Assessing effects of aerobic and anaerobic conditions on phosphorus sorption and retention capacity of water treatment residuals 总被引:1,自引:0,他引:1
Water treatment residuals (WTRs) are the by-products of drinking water clarification processes, whereby chemical flocculants such as alum or ferric chloride are added to raw water to remove suspended clay particles, organic matter and other materials and impurities. Previous studies have identified a strong phosphorus (P) fixing capacity of WTRs which has led to experimentation with their use as P-sorbing materials for controlling P discharges from agricultural and forestry land. However, the P-fixing capacity of WTRs and its capacity to retain sorbed P under anaerobic conditions have yet to be fully demonstrated, which is an issue that must be addressed for WTR field applications. This study therefore examined the capacity of WTRs to retain sorbed P and sorb further additional P from aqueous solution under both aerobic and anaerobic conditions. An innovative, low cost apparatus was constructed and successfully used to rapidly establish anoxic conditions in anaerobic treatments. The results showed that even in treatments with initial solution P concentrations set at 100 mg l(-1), soluble reactive P concentrations rapidly fell to negligible levels (due to sorption by WTRs), while total P (i.e. dissolved + particulate and colloidal P) was less than 3 mg l(-1). This equated to an added P retention rate of >98% regardless of anaerobic or aerobic status, indicating that WTRs are able to sorb and retain P in both aerobic and anaerobic conditions. 相似文献