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

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