基于絮体循环利用的印染废水生化出水深度处理研究

Advanced Treatment of Printing and Dyeing Wastewater Biological Effluent by Flocs Reusing

印染废水生化出水仍需深度处理才能实现回用.将自制的具有反应性能的有机-无机复配絮凝剂和兼具絮凝与氧化性能的无机复合絮凝剂,分别采用絮体回用方式多批次深度处理印染废水生化出水,可将废水色度降至10倍,并使絮凝剂的投加量和絮凝产泥量比传统絮凝方式减少50%,对化学需氧量(CODcr)的去除效果比传统絮凝方式提升5%—10%,絮体回用次数可达10次.有机-无机复配絮凝剂复配粉末活性炭后,采用絮体回用方式处理印染生化出水,可使絮凝剂投加量和絮凝产泥量再减少50%,絮体回用次数可达15次以上.

Dyeing wastewater biological effluent needs advanced treatment to meet the reuse standards. In this study, both an organic-inorganic compound flocculant with reaction performance and an inorganic compound flocculant with flocculation and oxidation performance were prepared and screened for advanced treatment on dyeing wastewater biological effluent with cycled flocs use. Comparing with traditional flocculation, the water chroma can be reduced to 10-fold and the fiocculant dosage and flocculation sludge production reduced by 50%, and chemical oxygen demand （CODer）removal efficiency increased by 5%-10%, and flocs recycled up to 10 times. Mixed with powdered activated carbon,the organic-inorganic compound flocculants can reduce another 50% of flocculant dosage and flocculation sludge production by effective cycle of 15 times.