臭氧-纳滤组合工艺深度处理污水处理厂二级出水试验

Study on Advanced Treatment of Secondary Effluent from WWTP by the Ozone-Nanofiltration Hybrid Process

为了进一步降低污水处理厂二级出水中有机物,提高出水水质,增加回用路径,进行了臭氧-纳滤组合工艺深度处理二级出水试验研究。结果表明,该组合工艺对二级出水中荧光类有机物和溶解性有机物具有高效去除能力,尤其对UV254、总有机碳的去除率最高可达到93.1%和88.1%。此外,臭氧投加浓度与膜污染情况密切相关。通过扫描电镜和比通量变化数据发现,相比于没有进行臭氧处理的空白组,臭氧-纳滤组合工艺中膜污染情况得到明显改善,且随着臭氧浓度的增加,膜污染程度逐渐减轻。当臭氧质量浓度为4 mg/L时,膜污染控制情况达到最优。相比于传统的混凝-沉淀-过滤水处理工艺,臭氧-纳滤组合工艺由于其出水水质优异、无二次污染、处理效率高等优点,在二级出水高效处理领域显示出广泛的应用前景。

To further decrease the organic matter in the secondary effluent of the wastewater treatment plant(WWTP),improve the effluent quality,and increase the reuse path,an experimental study on the advanced treatment of secondary effluent by ozone-nanofiltration combined process was carried out.The test proved that the process had high efficiency removal rate for fluorescent organic matter and dissolved organic matter in the secondary effluent water,and the maximum removal rate for UV254 and total organic carbon reached 93.1%and 88.1%.In addition,ozone dosing concentration was closely related to membrane pollution.The field emission scanning electron microscopy and specific flux change curve results proved that compared with the blank group without ozone treatment,the membrane pollution of the nanofiltration membrane in the ozone-nanofiltration had been greatly alleviated,and the degree of membrane fouling decreased as the ozone concentration increased.When the ozone mass concentration was 4 mg/L,the membrane pollution control situation reached the optimal level.Due to the advantages of excellent quality of effluent water,no secondary pollution,high treatment efficiency,etc.,the ozone-nanofiltration hybrid process showed a wide range of application prospects in the field of high-efficiency treatment of secondary effluent compared with the traditional water treatment process.