OCC造纸废水中微细胶黏物及Ca2+协同去除的研究

Study on the Synergistic Removal of Micro-stickies and Ca2+ from OCC Wastewater

中文关键词:  OCC造纸废水  微细胶黏物  电絮凝  Ca²⁺  絮凝体

Key Words:OCC papermaking wastewater  micro-stickies  electrocoagulation  Ca²⁺  floc

中文摘要:

      废旧箱纸板（OCC）造纸废水回用过程中面临着微细胶黏物沉积和因Ca²⁺浓度过高引起的厌氧颗粒污泥钙化两大难题。本研究对比评估了电絮凝法、物理法、化学法、生物酶法对模拟OCC造纸废水的处理效果；结果表明，电絮凝法能够更好去除OCC造纸废水中的微细胶黏物和Ca²⁺。在此基础上研究了电絮凝处理的最佳条件：铝为阳极材料，电流密度、电极间距和反应时间的最佳处理条件分别为115 A/m²、5 cm和60 min。在最佳条件下，经电絮凝处理后得到的絮凝体中，Al³⁺和Ca²⁺的相对含量高于对照组，表明电絮凝法能有效去除OCC造纸废水中的微细胶黏物、COD和Ca²⁺，且该方法绿色无污染，符合可持续发展的要求。

Abstract:

      There are two problems in the reusing process of OCC papermaking wastewater， i.e.， the deposition of micro stickies and the calcification of anaerobic granular sludge caused by high Ca²⁺ concentration. The effects of electrocoagulation， physical， chemical， and biological enzymatic treatments towards OCC papermaking wastewater were compared in this study. The results showed that the electrocoagulation treatment could remove more micro-stickies and Ca²⁺ compared with other methods. The optimal conditions of electrocoagulation treatment were further explored： aluminum used as the anode， the current density， electrode distance， and reaction time were 115 A/m²， 5 cm， and 60 min， respectively. The relative contents of Al³⁺ and Ca²⁺ in flocs after electrocoagulation treatment （under the optimum conditions） were higher than those in the control group， indicating that the micro-stickies， COD， and Ca²⁺ in OCC wastewater were removed by electrocoagulation effectively， which is a green and non-pollutant process conforming to the requirements of sustainable development.