研究报告
郑垒,汪晓军,汪星志.过硫酸盐-石灰苏打处理印染反渗透浓水研究[J].环境科学学报,2016,36(1):166-171
过硫酸盐-石灰苏打处理印染反渗透浓水研究
- The treatment of reverse osmosis concentrate from textile and dyeing industry with persulfate sulfate oxidation and lime-soda softening
- 基金项目：广东省中国科学院全面战略合作专项资金竞争性分配项目(No.2013B091500028)
- 作者
- 单位
- 郑垒
- 华南理工大学环境与能源学院, 广州 510006
- 汪晓军
- 华南理工大学环境与能源学院, 广州 510006
- 汪星志
- 华南理工大学环境与能源学院, 广州 510006
- 摘要：本文通过热活化过硫酸盐(PS)氧化印染反渗透浓水(ROC)中的难降解有机物,并辅以石灰苏打软水技术降低其硬度,以期实现印染ROC的回用.PS氧化研究表明,酸性条件相对于中性和碱性条件更有利于反应的进行,适宜的初始PS浓度为1000 mg·L-1,经济有效的活化温度为75℃.PS氧化降解ROC中难降解有机物的过程符合一级降解动力学模型.经PS氧化处理后,ROC中SO42-浓度由9600 mg·L-1上升到10350 mg·L-1,节省了回用时印染助剂的投加;TOC浓度<1.0 mg·L-1,表明ROC中难降解有机物已基本矿化.石灰苏打脱除印染ROC中硬度的研究表明,150 mg·L-1的石灰和800 mg·L-1的苏打投加量是降低硬度的最为适宜的药剂组合方式.PS-石灰苏打处理印染ROC可稳定实现出水COD<21.5 mg·L-1,硬度<17.5 mg·L-1,满足印染废水回用要求.
- Abstract：For total recycling of reverse osmosis concentrate(ROC) in textile and dyeing industry, the refractory organics were oxidized by heat activated persulfate(PS), and was softened by lime-soda. It is shown that the oxidation process of ROC favored acidic condition than neutral and alkaline conditions, and the initial PS concentration at 100 mg·L-1 and 75℃ would be most effective and economic. Simultaneously, refractory organics degradation of ROC well fitted by using the pseudo-first-order model. In addition, the sodium sulfate concentration could increase from 9600 to 10350 mg·L-1 to save the supplementation in dyeing procedure, and total organic carbon decreased from 34.6 mg·L-1 to 1.0 mg·L-1 or less. The appropriate lime and soda dosage were determined to be 150 mg·L-1 and 800 mg·L-1 for softening, respectively. The results show that the after proper treatment, the effluent was satisfied for reuse (COD < 21.5 mg·L-1, total hardness < 17.5 mg·L-1) in the dyeing process.
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