脱硫石膏对碱化土壤改良的研究
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摘要
盐碱土是地球广泛分布的一种土壤类型,约占陆地总面积的25%,总计约10亿公顷。我国约有盐碱地0.27亿公顷,盐碱地分布广泛,土壤含盐量高,盐份主要以氯化物为主,结构性差,肥力低,极大地限制了土地资源的有效利用。随着我国经济的持续发展,以及国家对“两控区”(酸雨控制区和二氧化硫控制区)内燃煤电厂烟气脱硫计划的实施,脱硫石膏的产量也将持续上升。作为煤燃烧产物,脱硫石膏的综合利用,不仅可以减少燃煤电场脱硫产物的堆放场地,减少二次污染,而且可以减少天然石膏的开采量,保护天然石膏资源,增加脱硫石膏产品销售额,符合我国可持续发展战略和循环经济理念,具有重要的现实意义。
通过分析在不同脱硫副产物施用量下土壤理化性质的变化规律,对脱硫副产物改良碱化土壤进行理论研究,探寻改良碱化土壤的优化利用模式。采用宁夏银川和鄂尔多斯的四种土样,每种土样分别加入四个水平(即施用量为0.5wt%、1.0wt%、1.5wt%、2.0wt%)的脱硫副产物,观察其改良效果。研究结果表明,脱硫副产物能降低土壤pH和碱化度,改善土壤理化性质,从而达到改良碱化土壤的作用;碱化土壤的改良效果在一定的范围内(0～2.0wt%)与脱硫副产物的用量呈正相关,超过这一范围,不但不能提高改良效果,而且还会有大量的盐分累积,增加改良的难度;脱硫副产物改良碱化土壤的最佳用量范围为0.5wt%～1.0wt%。
The saline soil that is an important land resource extensively distributed on the earth, it's area total about 1 billion hectares, which is about 25 percent of land area. There is approximately 27 million ha saline-alkali soil land in our country. The saline soil is distributed extensively, which the main salt content is the chloride, the structural property and fertility is poor, Therefore it is difficult to increase agricultural production.Along with continuous and rapid development of Chinese economy, as well as implementing of the project of flue gas desulfurization(FGD)of coal-burning powerplants in "Twain Control Zone"-the zone of acid rain controlling and the zone of sulfur dioxide(SO_2)controlling, the outputs of FGD gypsum is going to rise continuously. As coal combuistion products, multipurpose use of FGD gypsum, it not only reduce the mining quanlity of nature gypsum and pertect the natural gypsum resource, increase the saleroom of FGD gypsum products, answer for sustainable development stratagem of China, and it possesses important real significance.
The change of soil physical and chemical properties with different amount of by-product from flue gas (FGD) applied is researched .The effect of sodic soils reclamation was investigated using by-product from FGD and searched for the optimal quantity of soil amendment due to the improvement of sodic soils. The effect of soil reclamation was observed by using four soil samples from Yinchuan of Ningxia and Ordos of Inner Mongolia at four levels (i.e. the amount of by-product from FGD is 0.5wt%, 1.0wt%, 1.5wt%, and 2.0 wt%). As a result, soil pH and ESP decreased and this result indicates that by-product from FGD has the effect of improving sodic soil physical and chemical properties. In the certain range (0～2.0 wt%), the amelioration effect of sodic soil presents positive correlation with the applied amount of by-product from FGD. If the amount exceeds the range, the better effect of the soil reclamation could not be attained and a great deal of salt will be accumulated in soil and it will be more difficult to improve the sodic soil. In terms of this experiment result, the optimum range of applied amount is 0.5wt%～1.0wt%.
通过分析在不同脱硫副产物施用量下土壤理化性质的变化规律,对脱硫副产物改良碱化土壤进行理论研究,探寻改良碱化土壤的优化利用模式。采用宁夏银川和鄂尔多斯的四种土样,每种土样分别加入四个水平(即施用量为0.5wt%、1.0wt%、1.5wt%、2.0wt%)的脱硫副产物,观察其改良效果。研究结果表明,脱硫副产物能降低土壤pH和碱化度,改善土壤理化性质,从而达到改良碱化土壤的作用;碱化土壤的改良效果在一定的范围内(0～2.0wt%)与脱硫副产物的用量呈正相关,超过这一范围,不但不能提高改良效果,而且还会有大量的盐分累积,增加改良的难度;脱硫副产物改良碱化土壤的最佳用量范围为0.5wt%～1.0wt%。
The saline soil that is an important land resource extensively distributed on the earth, it's area total about 1 billion hectares, which is about 25 percent of land area. There is approximately 27 million ha saline-alkali soil land in our country. The saline soil is distributed extensively, which the main salt content is the chloride, the structural property and fertility is poor, Therefore it is difficult to increase agricultural production.Along with continuous and rapid development of Chinese economy, as well as implementing of the project of flue gas desulfurization(FGD)of coal-burning powerplants in "Twain Control Zone"-the zone of acid rain controlling and the zone of sulfur dioxide(SO_2)controlling, the outputs of FGD gypsum is going to rise continuously. As coal combuistion products, multipurpose use of FGD gypsum, it not only reduce the mining quanlity of nature gypsum and pertect the natural gypsum resource, increase the saleroom of FGD gypsum products, answer for sustainable development stratagem of China, and it possesses important real significance.
The change of soil physical and chemical properties with different amount of by-product from flue gas (FGD) applied is researched .The effect of sodic soils reclamation was investigated using by-product from FGD and searched for the optimal quantity of soil amendment due to the improvement of sodic soils. The effect of soil reclamation was observed by using four soil samples from Yinchuan of Ningxia and Ordos of Inner Mongolia at four levels (i.e. the amount of by-product from FGD is 0.5wt%, 1.0wt%, 1.5wt%, and 2.0 wt%). As a result, soil pH and ESP decreased and this result indicates that by-product from FGD has the effect of improving sodic soil physical and chemical properties. In the certain range (0～2.0 wt%), the amelioration effect of sodic soil presents positive correlation with the applied amount of by-product from FGD. If the amount exceeds the range, the better effect of the soil reclamation could not be attained and a great deal of salt will be accumulated in soil and it will be more difficult to improve the sodic soil. In terms of this experiment result, the optimum range of applied amount is 0.5wt%～1.0wt%.
引文
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