T型氧化沟提高脱氮效率的技术改造

采用延长边沟闷曝时间的方法对BOD降解模式T型氧化沟进行提高脱氮效率的改造。结果表明，边沟闷曝时间由0.5 h增至1 h，系统反硝化和硝化运行时间比t_DN/t_N由0.56调整至0.50时，提高了系统的NH₃-N的硝化效率，强化了脱氮能力。工艺改造后出水NH3-N浓度由改造前15.5 mg/L显著降低至10.4 mg/L，达到了广东省地方标准（DB 44/26-2001）第一时段的二级排放要求；系统脱氮效率由改造前52.1%显著提高到68.3％，有效地解决了污水厂出水NH₃-N浓度过高的问题；具有投资少、效果明显的特点，有一定的推广价值。

Technical modification of denitrification enhancement in T type oxidation ditches

Though prolonging aeration time in side ditches, the technical modification of T type oxidation ditches of BOD biodegraded mode in the aspect of denitrification enhancement was constructed. Results proved that, when aeration time in side ditches was increased from 0.5 h to 1 h and radio of denitrification time to nitrification time, t_DN/t_N ,was changed from 0.56 to 0.50, percentage of nitrification was increased and ability of denitrification of the system was improved. After modification, concentration of NH₃-N of outlet, 10.4 mg/L, dramatically lower than before, 15.5 mg/L, met discharged standards of Guangdong Province (DB 44/26-2001), and denitrification efficiency was dramatically enhanced from 52.1% to 68.3%. The problem of high concentration of NH₃-N of outlet in wastewater plants was solved. With low investment and high efficiencies, the modification has certain of value of popularization and application.