湿地介质高炉矿渣磷吸附与再生能力研究  

Phosphorus Adsorption and Regeneration of Electric Arc Furnace Steel Slag as Wetland Medium

作　　者：翟丽华[1] 何连生[2] 席北斗[2] 陈月[3] 孟睿[3] 霍守亮[2] 刘鸿亮[2] 

机构地区：[1]清华大学环境科学与工程系,北京100084 [2]中国环境科学研究院,北京100012 [3]北京化工大学环境工程系,北京100029

出　　处：《环境科学》2008年第12期3410-3414,共5页Environmental Science

基　　金：国家重点基础研究发展规划(973)项目(2002CB412302;2002CB412303);国家高技术研究发展计划(863)项目(2006AA10Z411)

摘　　要：通过批实验和长期动态柱实验评价了湿地介质高炉矿渣吸附和截留P能力,并利用水位落干操作提高P吸附再生能力.结果表明,长期柱实验可以精确评价矿渣吸附磷的能力,矿渣磷截留能力达到1.65 g/kg;湿地保持落干4周,磷吸附能力再生,吸附能力提高58%.矿渣磷吸附饱和后磷组分分析得到树脂提取磷(P1)占13%,Fe-P 39%,Al-P 21%,Ca-P 13%(1 mol/L HCl),Ca-P 14%(热浓HCl).吸附饱和前后X射线荧光衍射分析介质成分发现:K2O和P2O5分别提高3倍和1.7倍,Al2O3和FeO提高8%.高炉矿渣吸附特性的研究表明该材料能长期有效去除P,适当干湿交替操作可以延长人工湿地运行年限.The long-term phosphorus （P） adsorption and retention capacities of electric arc furnace （EAF） steel slag materials derived from one batch and a 278-d column experiments with a synthetic P solution were compared . The investigations of the regeneration of the P adsorption capacity by water level decrease was conducted. It was revealed column experiment on a long-term basis can determine P saturation of EAF accurately. And the results can be used for realistic estimations of constructed wetland systems （CWS） longevity. EAF slag showed a high affinity for P, reaching a saturation value of 1.65 g/kg. Regeneration experiment of the P adsorbing capacity by this material showed that, after 4 weeks of water level decrease, EAF steel slag was able to increase its initial P adsorption capacity to 2.65 g/kg. A sequential P fractionation experiment was performed to quantify the proportion of P bound to mineral compounds in EAF. From the most loosely bound to the most strongly bound P fraction, Pl was associated with resin extractable（ 13 % ）, Fe extractable （0.5 mol/L Na2 CO3, 39% ）, Al extractable （0.1 mol/L NaOH, 21% ）, Ca extractable （1 mol/L HCl, 13% ）, and Ca in a stable residual pool （concentrated hot HCl, 14% ）. X-ray fluorescence analyses of EAF steel slag chemical composition revealed that the continuous application of a P solution resulted in 300% and 170% increases in K2O and P2O5 , respectively. Al2O3 and FeO increased by 8 % , while the portion of CaO remained unchanged. The investigated properties （P retention potential, regeneration of P adsorption, P fractionation） provide useful data about the suitability of slag material as a media for longterm P removal and dry-wet operation can improve P retention capacity of EAF to prolong the longevity of full-scale CWS.

关 键 词：高炉矿渣 磷 吸附 再生 人工湿地 柱试验 批试验 

分 类 号：X511[环境科学与工程—环境工程]