Abstract:

Low-oxygen-aeration Bio-DOPP is used for the treatment of PTA sewage. According to the hydraulic experiment results, titanium alloy micron aeration pipes and silicone ones are selected for the biochemical treatment. The biochemical treatment process is divided into three stages. Due to the different main processes of facultative bacteria degrading pollutants, the sludge concentration increases in Stage Ⅰ and stabilized in Stage Ⅱ. The decrease of sludge concentration in Stage Ⅲ is caused by uneven aeration. High sludge concentration and long sludge retention time of the system ensure a stable and good removal effect on chemical oxygen demand(removal rate is 95%). The system has good ammonia nitrogen removal efficiency. Although an increase in the concentration of ammonia nitrogen in the inflow and a lower concentration of dissolved oxygen cause fluctuations in the effluent, it can quickly recover. However, the removal effect of total nitrogen is general, because the dynamic balance of nitrification and denitrification is vulnerable to environmental factors. Therefore, altering the aeration mode are helpful for the appropriate dissolved oxygen and good fluidization conditions.

Key words: low-oxygen-aeration, Bio-DOPP, PTA sewage, hydraulic experiment, biochemical treatment, chemical oxygen demand, ammonia nitrogen, total nitrogen

摘要：

采用低氧曝气生物倍增工艺处理精对苯二甲酸(PTA)污水。通过水力实验优选硅胶和钛合金微米曝气管进行生化处理实验，生化处理过程分为3个阶段。污泥浓度在阶段Ⅰ升高而在阶段Ⅱ稳定，是由兼性菌降解污染物的主要过程不同造成的；污泥浓度在阶段Ⅲ降低是由曝气不均引起的。高污泥浓度和长污泥停留时间保证了系统对化学需氧量稳定的、良好的去除效果，去除率为95%;系统具有较好的氨氮去除效果，虽然进水氨氮浓度升高、溶解氧低会造成出水质量波动，但可迅速恢复；系统对总氮的去除效果一般，这是由于硝化和反硝化作用的动态平衡易受环境因素影响。可通过改进曝气方式达到适宜的溶解氧和良好的流化情况。

关键词: 低氧曝气, 生物倍增, PTA污水, 水力实验, 生化处理, 化学需氧量, 氨氮, 总氮