水解-酸化-好氧工艺处理还原性染料废水的中试研究

通过中试研究考察水解-酸化-好氧工艺处理还原性染料生产废水的规律,以期为实际处理工程提供技术经济参数.实验结果表明:当染料生产废水的COD质量浓度<1200mg/L时,在水解反应器、酸化反应器和曝气池的水力停留时间(HRT)分别为6.0、7.0和6.0h的条件下,出水可以达到国家二级排放标准.酸化工艺虽然COD去除率低,甚至出现负去除,但酸化后有机物更易于生物降解,加速了后续好氧处理工艺的进程.氨氮的变化规律表明,染料废水中的大分子杂环化合物在水解阶段发生加氨作用,在酸化阶段发生脱氨开环作用.曝气池内微生物的生态演替规律表明,微型动物对系统的运行和水质变化具有指示性作用.

Pilot- scale test of hydrolyzation-acidification-oxidation process for the wastewater from dyestuff production

In order to investigate the feasibility of hydrolyzation-acidification-oxidation process for wastewater discharged from dyestuff production and to provide the optimal design parameter for the practical project, a pilot-scale test was carried out. The experimental results showed that when the influent was less than 1 200 mg/L, the hydraulic retention time of hydrolyzation reactor, acidification reactor and oxidation reactor were 6.0 h, 7.0 h and 6.0 h respectively, the effluent could meet the requirement of National Second-level Standard. Although low COD removal degree could be obtained in the process of acidification, it improved the BOD/COD ratio of wastewater significantly, which accelerated the biodegradation of hard-utilization organic and fasten the next step of oxidation. In addition, it is indicated that two steps of adding-amidogen and doffing-amidogen is involving in the hydrolyzation-phase and acidification-phase respectively for the degradation of macro-molecular heterocyclic organic in the wastewater. Furthermore, the microbial succession in the oxidation reactor can indicate the operation of the system and the change of water quality.