生石灰和钙镁磷肥联用对土壤水溶态氟含量影响

发布时间：2018-06-19 18:14

本文选题：土壤氟污染 + 水溶态氟　；参考：《环境科学与技术》2016年S2期

【摘要】：以贵州省开阳县金中镇境内某磷肥厂周边的氟污染土壤为研究对象,通过添加改良剂并于室温条件下养护稳定进行修复研究,并分析生石灰(CaO)与钙镁磷肥(FCMP)联用对土壤pH和土壤水溶态氟含量的影响,探讨其影响土壤水溶态氟含量的机理和对氟污染土壤的修复效果。实验共设置了7个CaO与FCMP质量比水平和4个添加量水平,在一致养护条件下,分析不同处理的土壤pH及水溶态氟含量变化。结果表明:CaO与FCMP联用,可以与土壤中氟生成氟化钙、氟磷酸钙等沉淀,并影响土壤胶体、有机基团等对F~-的吸附能力;与CaO、FCMP单独添加相比较,二者联用可以增强改良剂对土壤水溶态氟的抑制效果;综合考虑土壤pH对植物生长的影响、实际应用性价比等因素,CaO与FCMP质量比为3∶1,添加量为土壤质量的0.5%~1.0%时,改良剂对供试氟污染土壤的修复效果最优,可以使土壤水溶态氟含量下降82.94%~86.45%,土壤pH值则由3.94上升至5.71~7.00。
[Abstract]:Using fluorine contaminated soil around a phosphate fertilizer plant in Jinzhong Town, Kaiyang County, Guizhou Province as the research object, the remediation of fluorine contaminated soil was studied by adding modifier and maintaining and stabilizing at room temperature. The effects of calcium hydroxide (Cao) combined with FCMP on soil pH and soluble fluorine content in soil water were analyzed, and the mechanism of influencing soil water soluble fluorine content and the remediation effect of fluorine contaminated soil were discussed. Seven Cao / FCMP mass ratio levels and four additive levels were set up in the experiment. Under the same curing conditions, the changes of soil pH and water-soluble fluorine content in different treatments were analyzed. The results showed that the combination of FCMP and Cao could produce calcium fluoride, calcium fluoride phosphate and other precipitates in soil, and affect the adsorption ability of soil colloids and organic groups to FC-, which was compared with that of CaOG FCMP alone. The combined use of the two modifiers can enhance the inhibition effect of the modifier on the soluble fluorine in soil water. Considering the effect of soil pH on plant growth, the practical application of such factors as the ratio of Cao to FCMP mass is 3: 1, and the addition amount is 0.5 ~ 1.0% of the soil quality. The soil water soluble fluorine content decreased 82.94 and 86.45, and the soil pH increased from 3.94 to 5.71 to 7.00.
【作者单位】：深圳市铁汉生态与环境股份有限公司;
【基金】：广东省省级科技计划项目(2015B090904008) 深圳市科技计划项目(CXZZ20140418105252027) 广东省生态环境建设与保护(铁汉)工程技术研究中心(粤科函政字[2013]1589号)
【分类号】：X53

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