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41.
罗得河积水区地表径流中铝形态的变化 总被引:1,自引:0,他引:1
美国东部地区的罗得河流域遭受严重的酸沉降侵蚀,对流域和内湖生态系统产生致毒影响。监测地表水和土壤水中的铝形态及浓度变化是问题关键。该文应用自行设计的改进MINQL微机模型对该地区地表径流中铝 动力学变化规律了分析,得出有价值的论述。 相似文献
42.
模拟酸雨对酸性土壤铝溶出及其形态转化的影响 总被引:6,自引:0,他引:6
研究了我国南方酸沉降区主要土壤类型在模拟酸雨影响下,土壤中铝离子释放及铝形态转化的特点。结果表明,酸雨淋洗造成土壤中铝离子释放,酸雨pH值越低,铝离子释放量越大;酸雨淋洗还造成土壤中铝形态发生变化,酸雨pH越低,土壤中羟基态铝和腐殖质铝含量愈低,交换态铝含量越高,土壤中铝对植物和生态系统的危害性也越大。 相似文献
43.
Water treatment residuals (WTR) can reduce runoff P loss and surface co-application of P-sources and WTR is a practical way of land applying the residuals. In a rainfall simulation study, we evaluated the effects of surface co-applied P-sources and an Al-WTR on runoff and leacheate bioavailable P (BAP) losses from a Florida sand. Four P-sources, namely poultry manure, Boca Raton biosolids (high water-soluble P), Pompano biosolids (moderate water-soluble P), and triple super phosphate (TSP) were surface applied at 56 and 224kgPha(-1) (by weight) to represent low and high soil P loads typical of P- and N-based amendments rates. The treatments further received surface applied WTR at 0 or 10gWTRkg(-1) soil. BAP loss masses were greater in leachate (16.4-536mg) than in runoff (0.91-46mg), but were reduced in runoff and leachate by surface applied WTR. Masses of total BAP lost in the presence of surface applied WTR were less than approximately 75% of BAP losses in the absence of WTR. Total BAP losses from each of the organic sources applied at N-based rates were not greater than P loss from TSP applied at a P-based rate. The BAP loss at the N-based rate of moderate water-soluble P-source (Pompano biosolids) was not greater than BAP losses at the P-based rates of other organic sources tested. The hazards of excess P from applying organic P-sources at N-based rates are not greater than observed at P-based rates of mineral fertilizer. Results suggest that management of the environmental P hazards associated with N-based rates of organic materials in Florida sands is possible by either applying P-sources with WTR or using a moderate water-soluble P-source. 相似文献
44.
按照地表水监测技术规范(HJ/T91-2002),对驻马店市地表水体进行采样,用等离子体发射光谱法两条铝分析线,对所采各个断面水样中的铝浓度进行分析测定,分析得出了流域内地表水中铝含量的一般特征,为下一步地表水体环境质量标准中增设铝项目的管理提供技术支持。 相似文献
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The study aims to identify the potential acute effects of suspended aluminum nitride (AlN)nanoparticles (NPs) on soluble microbial products (SMP) of activated sludge. Cultured activated sludge loaded with 1, 10, 50, 100, 150 and 200 mg/L of AlN NPs were carried out in this study. As results showed, AlN NPs had a highly inverse proportionality to bacterial dehydrogenase and OUR, indicating its direct toxicity to the activated sludge viability. The toxicity of AlN NPs was mainly due to the nano-scale of AlN NPs. In SMP, AlN NPs led to the decrease of polysaccharide and humic compounds, but had slight effects on protein. The decrease of tryptophan-like substances in SMP indicated the inhibition of AlN NPs on the bacterial metabolism. Additionally, AlN NPs reduced obviously the molecular weight of SMP, which might be due to the nano-scale of AlN. 相似文献
49.
A newly designed aluminum hydroxide gel-coated nanoscale zero-valent iron(AHG@NZVI)with enhanced activity and dispersibility of NZVI was successfully synthesized.The AHG@NZVI composite was synthesized via control of the surface AHG content.AHG@NZVI-1,AHG@NZVI-2 and AHG@NZVI-3 were prepared under centrifugal mixing speeds of 1000,2000 and 4000 r/min,respectively.The activity of AHG@NZVI was evaluated by its tetracycline(TC) removal efficiency.The effects of AHG content,pH value,reaction temperatu... 相似文献
50.
Profiles of and variations in aluminum species in PAC-MC used for the removal of blooming microalgae
Polyaluminum chloride modified clay (PAC-MC) is a safe and efficient red tide control agent that has been studied and applied worldwide. Although it is well known that the distribution of hydrolytic aluminum species in PAC affects its flocculation, little is known about the influence of particulars aluminum species on the microalgae removal efficiency of PAC-MC; this lack of knowledge creates a bottleneck in the development of more efficient MCs based on aluminum salts. The ferron method was used in this study to quantitatively analyze the distributions of and variations in different hydrolytic aluminum species during the process of microalgae removal by PAC-MC. The results showed that Ala, which made up 5%–20% of the total aluminum, and Alp, which made up 15%–55% of the total aluminum, significantly affected microalgae removal, with Pearson's correlation coefficients of 0.83 and 0.89, respectively. Most of the aluminum in the PAC-MC sank rapidly into the sediments, but the rate and velocity of settlement were affected by the dose of modified clay. The optimal dose of PAC-MC for precipitating microalgae was determined based on its aluminum profile. These results provide guidance for the precise application of PAC-MC in the control of harmful algal blooms. 相似文献