印染废水处理工程的新型生物流化床组合工艺技术分析

针对高浓度难降解的工业有机废水，利用自行开发的新型结构生物流化床技术，通过工程设计实施了若干废水处理的应用实践.从成功运行的12个工程中选取了3个分别为1200、 2000 和13000 m³/d的印染废水处理工程作为案例，分析流化床组合工艺处理难降解有机废水的原理，从技术经济可行性方面总结新型生物流化床技术处理印染废水的工程经验.3个工程规模案例印染废水处理生物系统停留时间分别为23、 34和21.8 h，进水容积负荷（COD）分别为1.75、 4.75、 2.97 kg/(m³·d)，相应的COD去除率达97.3%、 98.1%、 95.8%.在正常运行工况条件下，工艺出水的各项污染指标均达到广东省一级排放标准（高于国家相应标准）的限值要求，整个工程的运行费用分别为0.91、 1.17及0.88元/m³.工程实践表明，采用新型生物流化床组合技术处理印染废水，克服了传统方法的缺点，具有停留时间短、氧利用率高、有机污染物转化速率快以及污泥产量少等的特点.基于未来的发展，提出了在组合工艺中实现低碳废水处理技术的流程，考虑生态安全和资源循环利用的结合.

Analysis of Novel Style Biological Fluidized Bed A/O Combined Process in Dyeing Wastewater Treatment

A novel biological fluidized bed was designed and developed to deal with high-concentration refractory organic industrial wastewater. From 12 successful projects, three cases of dyeing wastewater treatment projects with the scale of 1200, 2000 and 13000 m3/d respectively were selected to analyze the principle of treating refractory organic wastewater with fluidized bed technology and discuss the superiority of self-developed biological fluidized bed from the aspects of technical and economic feasibility. In the three cases, when the hydraulic retention time (HRT) of biological system were 23, 34 and 21. 8 h, and the volume loading of influents (COD) were 1.75, 4.75 and 2.97 kg/(m3 x d), the corresponding COD removal were 97.3%, 98.1% and 95.8%. Furthermore the operating costs of projects were 0.91, 1.17 and 0.88 yuan per ton of water respectively. The index of effluent all met the 1st grade of Guangdong Province wastewater discharge standard. Results showed that the biological fluidized bed had characteristics of shorter retention time, greater oxygen utilization rate, faster conversion rate of organic pollutants and less sludge production, which made it overcome the shortcomings of traditional methods in printing and dyeing wastewater treatment. Considering the development of technology and the combination of ecological security and recycling resources, a low-carbon wastewater treatment process was proposed.