制浆造纸厂富铁污泥性质及其回用为污泥调理剂研究

发布时间：2018-05-06 00:25

本文选题：富铁污泥 + 污泥调理　；参考：《西安交通大学学报》2016年09期

【摘要】：针对制浆造纸废水芬顿氧化过程产生的富铁污泥含铁量高的优势,及其易引起混合污泥脱水困难的问题,提出对富铁污泥进行酸处理溶出其中的Fe3+,以用作污泥调理剂的资源化利用新思路。采用元素分析仪、X射线荧光分析仪(XRF)和电感耦合等离子体发射光谱仪(ICP-OES)等分析富铁污泥的组成,采用X射线衍射仪(XRD)和X射线光电子能谱仪(XPS)分析富铁污泥中铁元素的存在形式;以铁的溶出率和酸消耗量为指标优化酸处理富铁污泥的反应条件,以污泥比阻的降低程度为指标评价制得的污泥调理剂的调理效果,并与FeCl_3进行对比。结果表明:富铁污泥中铁的质量分数可达39.32%,主要以三价的水合氧化铁形式存在;常温下富铁污泥酸处理的优化条件是硫酸与绝干富铁污泥的质量比为0.91g/g,反应时间为180 min,在此条件下铁溶出率可达57.24%。经酸处理后的富铁污泥制得的调理剂在投加量(以铁质量计)为城市污水处理厂剩余污泥干质量的3.45%时,可将污泥比阻降为其初始值的17.90%,与FeCl_3的污泥调理效果相当,这说明该方法是制浆造纸厂富铁污泥资源化利用的一种可行工艺。
[Abstract]:In view of the advantages of high iron content in ferrium-rich sludge produced by Fenton oxidation process of pulp and papermaking wastewater and the difficulty of dewatering mixed sludge, the Fe3 of ferrium-rich sludge was dissolved by acid treatment. A new way of resource utilization for sludge conditioning agent is presented. The composition of iron-rich sludge was analyzed by elemental analyzer (X ray fluorescence analyzer) and inductively coupled plasma emission spectrometer (ICP-OESX). X ray diffractometer (XRD) and X ray photoelectron spectrometer (XPS) were used to analyze the forms of iron in ferric rich sludge, the dissolution rate and acid consumption of iron were taken as indexes to optimize the reaction conditions of acid treatment of iron rich sludge. The effect of sludge conditioning agent was evaluated by reducing the specific resistance of sludge and compared with FeCl_3. The results show that the mass fraction of iron in ferrium-rich sludge can reach 39.32, mainly in the form of trivalent hydrated iron oxide. The optimum conditions of iron-rich sludge acid treatment at room temperature were as follows: the mass ratio of sulfuric acid to dry ferrium-rich sludge was 0.91g / g, the reaction time was 180 min, and the iron dissolution rate could reach 57.24g under these conditions. When the amount of iron added by the iron-rich sludge after acid treatment is 3.45% of the dry mass of the excess sludge of the municipal sewage treatment plant, the specific resistance of the sludge can be reduced to 17.90% of its initial value, which is equivalent to the effect of the sludge conditioning of FeCl_3. This shows that this method is a feasible process for utilization of ferric sludge in pulp and paper mill.
【作者单位】：西安交通大学能源与动力工程学院;中国轻工业长沙工程有限公司;西安交通大学化学工程与技术学院;
【基金】：国家自然科学基金资助项目(51308453) 中国轻工业长沙工程有限公司资助项目中央高校基本科研业务费专项资金资助项目(xjj2013078)
【分类号】：X793

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