聚合氯化铝制备条件优化与应用研究
发布时间:2018-01-03 19:27
本文关键词:聚合氯化铝制备条件优化与应用研究 出处:《西南交通大学》2017年硕士论文 论文类型:学位论文
更多相关文章: 聚合氯化铝 优化 高铁酸钾 预氧化 强化混凝
【摘要】:本文研究聚合氯化铝的制备过程,从铝酸钙粉、盐酸、超纯水三者投加比例、反应时间、反应温度、投加顺序、投加速度等5个方面对聚合氯化铝制备条件进行优化,找到最佳反应条件,由此制得聚合氯化铝简称NC,目的是与市场上普通聚合氯化铝(PAC)区别开来。在此基础上,分别研究了自制聚合氯化铝(NC)与普通聚合氯化铝(PAC)在不同投加量条件下,二者对浊度、色度、UV_(254)、氨氮、COD_(Mn)等水体指标的去除率情况,以及在投加量相同,沉淀时间不同的条件下,对浊度、色度、COD_(Mn)的去除率情况,最后研究了NC与氧化剂高铁酸钾复合效果,采用响应曲面法考察高铁酸钾投加量和水体pH的交互作用对浊度和UV_(254)去除率的影响规律,通过建立二次响应模型优化工艺参数。研究结果表明:①NC的最佳制备条件为先加超纯水,将铝酸钙粉投加在超纯水中充分搅拌混合后,缓慢滴加盐酸;最佳反应温度95℃;最佳反应时间2h;铝酸钙粉、超纯水、盐酸最佳投加比例1:2.5:2.5。制得NC的A1_2O_3含量及盐基度分别为9.57%、72.53%。②在相同投加量下,NC对浊度、色度、UV_(254)、COD_(Mn)的去除率均高于PAC。两种混凝剂对氨氮的去除效果均较差。NC投加量在25mg/L时,浊度、色度、UV_(254)、COD_(Mn)的去除率分别为91.18%、78.61%、58.9%、52.88%。在相同投加量下,在相对较短时间内,NC形成矾花速度较快,较PAC更先达到稳定去除效果。③高铁酸钾预氧化与NC混凝的联合作用对浊度和UV_(254)的去除效果,明显优于单独投加混凝剂,在一定程度上可以强化混凝过程对污染物的去除;通过响应曲面模型进行参数优化及实验验证可得,在高铁酸钾投加量为2.13 mg/L和pH值为6.52条件下,浊度及UV_(254)去除率分别可达到92.5%和63.8%。当水体在偏酸性或中性条件下,NC和高铁酸钾联用强化混凝效果较优。
[Abstract]:The preparation process of the polymerization aluminum chloride, hydrochloric acid from calcium aluminate powder, ultra pure water, three dosage ratio, reaction time, reaction temperature, dosage in order to optimize the preparation conditions of polymerization aluminum chloride in 5 aspects of investment acceleration, find the best reaction conditions, thus prepared polyaluminium chloride referred to as NC the purpose is, and the market common polyaluminium chloride (PAC) to distinguish. On this basis, respectively studies the self-made polyaluminium chloride (NC) and polyaluminium chloride (PAC) in different dosage conditions, two of turbidity, chroma, UV_ (254), ammonia nitrogen (Mn), COD_ water index removal rate, and at the same dosage, sedimentation time under different conditions, the turbidity, chroma, COD_ (Mn) removal rate, at the end of the NC and potassium ferrate composite oxidant effect, using response surface method to study potassium ferrate dosage and the interaction of water pH 娴婂害鍜孶V_(254)鍘婚櫎鐜囩殑褰卞搷瑙勫緥,閫氳繃寤虹珛浜屾鍝嶅簲妯″瀷浼樺寲宸ヨ壓鍙傛暟.鐮旂┒缁撴灉琛ㄦ槑:鈶燦C鐨勬渶浣冲埗澶囨潯浠朵负鍏堝姞瓒呯函姘,
本文编号:1375271
本文链接:https://www.wllwen.com/shoufeilunwen/boshibiyelunwen/1375271.html