光催化-微生物直接耦合技术处理桉木化机浆废水的研究

Study on Intimately Coupling Photocatalysis and Biological Technology for the Treatment of Eucalyptus Chemical⁃mechanical Pulp Wastewater

针对造纸行业中桉木化机浆废水难处理、排放量较大、有机污染负荷较高、成分复杂等问题。以TiO_(2)-聚氨酯海绵为光催化载体,活性污泥为生物种源,单独光催化和单独活性污泥以及光催化生物间接耦合作对照,在可见光下构建了光催化-微生物直接耦合体系(ICPB);对ICPB处理桉木化机浆废水进行了工艺优化,探讨了ICPB技术处理桉木化机浆废水的可行性。结果表明,ICPB体系最佳工艺条件为:载体填充率5%,pH=7,曝气量0.6 L·min^(-1),NH_(4)Cl添加量为54.1 mg·L^(-1),Na_(2)HPO_(4)·12H_(2)O添加量为55.1 mg·L^(-1),反应时间为10 h;处理前后的常规水质指标和GC-MS结果显示,ICPB体系具有较好的降解性能和矿化能力。

Eucalyptus chemical⁃mechanical pulp wastewater is one of the difficult wastewaters in the paper industry with large discharge,high organic pollution load and complex composition.The photocatalytic⁃microbial direct coupling system(ICPB)was constructed under visible light using TiO_(2)⁃polyurethane sponge as the photocatalytic carrier,activated sludge as the biological seed source,photocatalytic alone and activated sludge alone and photocatalytic⁃biological indirect coupling as the control,and the process optimization of ICPB treatment of Eucalyptus chemical⁃mechanical pulp wastewater was carried out.The feasibility of ICPB technology for treating eucalyptus chemical pulp wastewater was explored.The results showed that the optimal conditions of ICPB system were carrier filling rate 5%,pH=7,0.6 Lmin^(-1)of aeration,54.1 mgL^(-1)of NH_(4)Cl,55.1 mgL^(-1)of Na_(2)HPO_(4)12H_(2)O and 10 h of reaction time;the conventional water quality indicators and GC⁃MS results before and after the treatment showed that the ICPB system had better degradation performance and mineralization ability.