SBR短程硝化处理老龄化垃圾渗滤液

Treatment of Aged Landfill Leachate by Shortcut Nitrification in Sequencing Batch Reactor

采用序批式反应器(SBR)短程硝化系统处理老龄化垃圾渗滤液,研究有机物浓度、水力停留时间(HRT)、pH值、温度对短程硝化系统的影响。以硝化污泥接种反应器,在溶解氧为1.0～1.2 mg/L和温度为(35±1)℃下达到亚硝酸氮的快速积累。结果表明,在进水氨氮为300mg/L、COD为600 mg/L、HRT为24 h、pH值为7.5～8.5、温度为(35±1)℃、溶解氧浓度保持不变的条件下,出水氨氮平均为134.0 mg/L,出水亚硝酸氮平均为142.5 mg/L,对氨氮的平均去除率为55.3%,NO2--N/NH4+-N平均值为1.06,出水硝酸氮平均为10.2 mg/L,亚硝酸氮的平均积累率为93.3%,对COD的去除率稳定在38%左右。

The shortcut nitrification process was used to treat aged landfill leachate in a sequencing batch reactor （SBR）. The effect of organic concentration, hydraulic retention time （HRT）, pH and temperature was investigated. The reactor was inoculated with nitrifying sludge, and nitrite accumulation was achieved at DO concentration of 1.0 to 1.2 mg/L and temperature of （35 ± 1 ） ℃ The results showed that the average concentrations of NH4^＋ - N, NO2^ - N and NO3 - N in effluent were 134.0 mg/L, 142.5 mg/L and 10.2 mg/L, the average NO2^- -N/NH4＋ -N ratio was 1.06, the average nitrite accumulation was 93.3% , and the average removal rates of NH4 - N and COD were 55.3% and about 38% respectively when the influent NH4 - N and COD were 300 mg/L and 600 mg/L respectively. The reaction conditions were controlled as follows ： HRT at 24 h, pH at 7.5 to 8.5, temperature at （35 ± 1 ） ℃ and unchanged DO concentration.