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Salinization and sodicity are obstacles for vegetation reconstruction of coastal tidal flat soils. A study was conducted with flue gas desulfurization(FGD)-gypsum applied at rates of 0, 15, 30, 45 and 60 Mg/ha to remediate tidal flat soils of the Yangtze River estuary.Exchangeable sodium percentage(ESP), exchangeable sodium(ExNa), p H, soluble salt concentration, and composition of soluble salts were measured in 10 cm increments from the surface to 30 cm depth after 6 and 18 months. The results indicated that the effect of FGD-gypsum is greatest in the 0–10 cm mixing soil layer and 60 Mg/ha was the optimal rate that can reduce the ESP to below 6% and decrease soil p H to neutral(7.0). The improvement effect was reached after 6 months, and remained after 18 months. The composition of soluble salts was transformed from sodic salt ions mainly containing Na~+, HCO_3~-+ CO_3~(2-)and Cl-to neutral salt ions mainly containing Ca~(2+)and SO_4~(2-). Non-halophyte plants were survived at 90%. The study demonstrates that the use of FGD-gypsum for remediating tidal flat soils is promising. 相似文献
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对贵溪冶炼厂炼铜闪速炉排烟系统用电收尘器的大修和改造进行了详细的论述,并总结出了一套适合本厂电收尘器大修的经验。 相似文献
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以某工程为例,介绍了一种特殊电除尘器钢支架的结构形式,通过结构设计软件计算和有限元整体屈曲分析,证明采用传统的计算长度系数法进行立柱稳定计算,其结果偏不安全,建议采用整体屈曲分析计算. 相似文献
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介绍了半干法脱硫技术在国电靖远电厂220MW机组脱硫升级改造项目中的应用,分析了脱硫改造选型的依据和过程,探讨了半干法脱硫设备的结构、特点及优势,为同类脱硫改造提供了参考。 相似文献
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适应低排放的电除尘技术探讨 总被引:1,自引:0,他引:1
针对高标准的排放要求以及将进一步提高的排放标准,对电除尘器是否能满足目前的排放标准和低排放要求进行了研究。通过对国内110个机组配套电除尘器实际应用情况调查和国外燃煤机组电除尘器应用分析,客观地评价了电除尘器对国内煤种的适应性,指出移动电极式电除尘器、双极异距电流体微粒聚合器、烟气调质、湿式电除尘器、低低温电除尘器等新技术的发展和综合应用是满足30mg/m3低排放标要求的最佳选择。 相似文献
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