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71.
研究了磷酸铵镁(MAP)结晶法晶体捕集反应器在曝气条件下回收猪场厌氧消化液中磷元素的能力.结果表明,利用曝气方式提高猪场厌氧消化液的p H值,进行MAP结晶回收磷完全可行.MAP的饱和度指数(SI)与废水p H值呈多项式函数关系,结晶反应的最佳p H值为8.5~9.0;随着曝气时间延长至180 min,反应器内废水p H值可提高至8.5;常温下(25℃),反应器内MAP回收磷的反应动力学的反应级数(n)为1.98,速率常数(K25)为7.04×10-4L·mg-1·min-1;反应器单个运行周期为270 min;磷的平均去除率为82%左右.MAP晶体捕集反应器上的晶体在一个反应周期内即可成形,随着反应周期的增加,晶体颗粒逐渐增大.利用扫描电镜和X射线衍射仪对捕集器所捕集的晶体进行了表征,证实晶体为高纯度的MAP. 相似文献
72.
Derome John Lindroos Antti-Jussi Lindgren Martti 《Water, Air, & Soil Pollution: Focus》2001,1(1-2):169-186
Soil acidity parameters (pH, basesaturation, exchangeable Al) in the organic and mineralsoil layers and in soil water (pH, dissolved organiccarbon, total Al, Al3+ and molar Ca/Al ratios) insix Norway spruce stands in different parts of Finlandwere compared. An attempt was also made to relate thedegree of defoliation in the tree stand to N and Sdeposition and soil parameters. No relationship was foundbetween soil acidity parameters and defoliation in thesix stands. Defoliation was positively correlated withstand age and the C/N ratio of the organic layer, andnegatively with the cation exchange capacity. The plotlocated on a so-called sulphate soil on the west coast ofFinland had very low soil pH values, and extremely highAl and SO4
2- concentrations and molar Ca/Alratios of well below 1.0 in soil water. Despite the highnatural acidity in the soil on this plot, defoliation inthe spruce stand was the lowest (mean 8.6%) of all sixplots. The results of this study indicate that soilacidity is not a major factor affecting stand conditionin these spruce stands, and that the variation in soilacidity parameters is closely related to climatic factorsand natural soil formation processes. 相似文献
73.
对热水锅炉爆炸事故的热力学机理进行详尽的分析基础上,提出了相应的预防及其解决问题的办法。 相似文献
74.
A Conceptual Model of Spatially Heterogeneous Nitrogen Leaching from a Welsh Moorland Catchment 总被引:2,自引:0,他引:2
C. D. Evans B. Reynolds C. J. Curtis H. D. Crook D. Norris S. A. Brittain 《Water, Air, & Soil Pollution: Focus》2004,4(6):97-105
Soil- and stream-water data from the Plynlimon research area, mid-Wales, have been used to develop a conceptual model of spatial variations in nitrogen (N) leaching within moorland catchments. Extensive peats, in both hilltop and valley locations, are considered near-complete sinks for inorganic N, but leach the most dissolved organic nitrogen (DON). Peaty mineral soils on hillslopes also retain inorganic N within upper organic horizons, but a proportion percolates into mineral horizons as nitrate (NO
3
–
), either through incomplete immobilisation in the organic layer, or in water bypassing the organic soil matrix via macropores. This NO
3
–
reaches the stream where mineral soilwaters discharge (via matrix throughflow or pipeflow) directly to the drainage network, or via small N-enriched flush wetlands. NO
3
–
in hillslope waters discharging into larger valley wetlands will be removed before reaching the stream. A concept of catchment nitrate leaching zones is proposed, whereby most stream NO
3
–
derives from localised areas of mineral soil hillslope draining directly to the stream; the extent of these zones within a catchment may thus determine its overall susceptibility to elevated surface water NO
3
–
concentrations. 相似文献
75.
76.
Richard H. French 《Journal of the American Water Resources Association》1983,19(5):729-733
ABSTRACT In many impoundment dynamic water quality models, the growth of two or more ecologic groups of phytoplankton may be simulated. These ecologic groups are differentiated by growth rates, temperature tolerances, settling rates, and the Michaelis-Menten half saturation constants for necessary nutrients. In this investigation, the effect of variations in the Michaelis-Menten half saturation constant for the limiting nutrient when two competing ecologic groups of algae are simulated is examined. In an idealized case, it is demonstrated that uncertainty in the half saturation constant for the limiting nutrient for one ecologic group of algae can significantly affect the simulation results and in some cases could lead to a poorly designed impoundment restoration program. 相似文献
77.
Jonathan D. Phillips 《Journal of the American Water Resources Association》1990,26(2):333-342
ABSTRACT: A wetness index that was derived from Beven's distributed hillslope runoff model and based on the concept of relative wetness is introduced as a wetland identification and mapping tool. Data requirements are modified to make the model suitable for use by managers and field agents. The model predicts the relative propensity of any point or small area within a landscape unit to become saturated. This allows an index of relative wetness to be produced. Points on the landscape can then be assigned values of relative wetness. The index has potential utility for: (1) providing more detailed information on wetness conditions than binary (wetland-nonwetland) classification systems now in use; (2) assisting in wetland identification when field indicators are absent or ambiguous; (3) application in dryland environments where common wetland indicators are largely irrelevant; and (4) broad-scale wetland mapping in a geographic information systems environment using existing digital topographic and soils databases. 相似文献
78.
为了掌握水化煤饱和-风干过程中不同风干时间煤样的自燃特性,对水化煤样进行不同风干时间的实验煤样预处理,形成不同风干时间的水化煤样。通过煤样含水率测试、物理吸附实验和程序升温实验,对不同饱和-风干时间的水化煤样以及原煤样的吸氧量和CO,CO2,CH4,C2H4,C2H6,C3H8气体浓度随煤温的变化规律进行实验研究。研究结果表明:不同风干时间水化煤样随着煤温的逐渐升高,吸氧量呈先减小后增大趋势;不同风干时间的水化煤样的自燃标志性气体析出速率随煤温的升高均呈指数增大的变化趋势;在低温氧化阶段,水化煤样比原煤反应时间提前,且反应速率更快,这表明水化煤样比原煤样更加容易发生自燃,且风干时间为20 min的水化煤危险性更大。 相似文献
79.
80.
Effect of water regimes and organic matters on transport of arsenic in summer rice (Oryza sativa L.) 总被引:1,自引:1,他引:0
The arsenic contamination in soil-water-plant systems is a major concern of where, the groundwater is being contaminated with
arsenic (above 0.01 mg/L) in the Indian subcontinent. The study was conducted with organic matter to find out the reducing e ect on
arsenic load to rice (cv. Khitish). It was observed that intermittent ponding reduced arsenic uptake (23.33% in root, 13.84% in shoot and
19.84% in leaf) at panicle initiation stage, instead of continuous ponding. A decreasing trend of arsenic accumulation (root > straw >
husk > whole grain > milled grain) was observed in di erent plant parts at harvest. Combined applications of lathyrus + vermicompost
+ poultry manure reduced arsenic transport in plant parts (root, straw, husk, whole grains and milled grain) which was significantly at
par (p > 0.05) with chopped rice straw (5 tons/ha ) + lathyrus green manuring (5 tons/ha) in comparison to control and corresponding
soils. A significant negative correlation of arsenic with phosphorus (grain P with arsenic in di erent parts R2= 0.627–0.726 at p >
0.01) was observed. Similarly, soil arsenic had a negative correlation with soil available phosphorus (R2 = 0.822 at p > 0.001) followed
by soil nitrogen (R2= 0.762 at p > 0.01) and soil potassium (R2 = 0.626 at p > 0.01). Hence, e ective management of contaminated
irrigation water along with organic matter could reduce the arsenic build up to plants and soil. 相似文献