T型氧化沟提高脱氮效率的技术改造

Technical modification of denitrification enhancement in T type oxidation ditches

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tDN/tN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。

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,tDN/tN,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.