Combined chemical coagulation-flocculation/ultraviolet photolysis treatment for anionic surfactants in laundry wastewater
Combined chemical coagulation-flocculation/ultraviolet photolysis treatment for anionic surfactants in laundry wastewater
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化学混凝絮凝/紫外光解联合处理洗衣废水中阴离子表面活性剂
DOI：
10.1016/j.jece.2014.09.011
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发表时间：
2014-12-01
影响因子：
7.7
通讯作者：
Yang, Fenglin
中科院分区：
文献类型：
--
作者：
Terechova, E. L.;Zhang, Guoquan;Yang, Fenglin
采用化学混凝-紫外光解组合工艺对洗衣废水中的阴离子表面活性剂直链烷基苯磺酸盐（LAS）进行分离和氧化降解，使出水具有适宜的排放特性。选择矿物灰、ZnCl 2和Praestol-650（P-650）分别作为混凝剂-吸附剂、络合剂和阳离子高分子絮凝剂。采用响应面法对3种成分的用量进行优化。通过与实际洗衣废水的平行试验，进一步验证了响应面法得到的最优参数值。结果表明，当ZnCl 2投加量为29.54 mg/L，灰分投加量为1936.35 mg/L，P-650投加量为196.38 mg/L时，自制LAS废水和实际洗衣废水的LAS去除率分别达到71.26%和74.58%。研究了溶液pH值对LAS紫外光解过程的影响。结果表明，碱性介质有利于LAS的光解去除。实验结果表明，以Zn 2+盐和矿物灰为混凝剂，Praestol-650为阳离子高分子絮凝剂，采用化学混凝-絮凝/紫外光解组合工艺处理LAS具有高效、急流的处理速度、较高的吸附和萃取能力以及较好的催化氧化能力。(C)2014爱思唯尔有限公司版权所有。
In this work, a combined chemical coagulation-flocculation/ultraviolet photolysis process was used to separate and oxidative degrade the linar alkylbenzene sulfonate (LAS), an anionic surfactant in laundry wastewater, aiming at making the effluent dischargeable with suitable characteristics. Mineral ash, ZnCl2, and Praestol-650 (P-650) were chosen as the coagulant-sorbent, the complex former and the cationic high-molecular flocculants, respectively. The dosages of three components were optimized through the response surface methodology (RSM). The optimum parameters values obtained from RSM were further proved by a successful parallel trial with the actual laundry wastewater. Results showed that the maximum LAS removal efficiency of 71.26% and 74.58% were achieved for the self-made LAS wastewater and the actual laundry wastewater when the dosages of ZnCl2, ash and P-650 was 29.54, 1936.35 and 196.38 mg/L, respectively. The effect of solution pH in LAS ultraviolet photolysis process was also investigated. Results indicated that the alkaline medium is beneficial to LAS photolysis removal. These results support the applicability of the combined chemical coagulation-flocculation/ultraviolet photolysis process for LAS removal due to its efficient and rapids treatment rate, high adsorption and extraction capacity, and acceptable catalytic oxidation ability using Zn2+ salts and mineral ash as specific coagulant and Praestol-650 as cationic high-molecular flocculant. (C) 2014 Elsevier Ltd. All rights reserved.