Zang Dai-Jun
Department of Environmental Science, Chongqing University, China.
J Environ Sci (China). 2003 May;15(3):423-32.
The integration of methanogenesis with denitrification and anaerobic ammonium oxidation (ANAMMOX) was studied in an expanded granular sludge bed (EGSB) reactor in this work. Experimental results from the continuous treatment of wastewater with nitrite and ammonium, which lasted for 107 days, demonstrated that wastewater with high nitrite and ammonium could be anaerobically treated in an expanded granular sludge bed reactor. More than 91% to 97% of COD were removed at up to about 3.9 g COD/(L x d) of COD volumetric loading rate. More than 97% to 100% of nitrite was denitrified at up to about 0.8 g NO2(-) -N/(L x d), which is 16 times higher than that in a conventional activated sludge system with nitrification/denitrification (0.05 gN/(L x d)). No dissimilatory reduction of nitrite to ammonium occurred in the process. However, maximum of about 40% ammonium was found to be lost. Batch tests of 15 days with sludge from the reactor showed that 100% of nitrite was denitrified completely, and about 3% of ammonium was removed when only ammonium (34.3 mg/L) and nitrite (34.3 mg/ L) were added into the sludge suspension medium. Furthermore, about 15% of ammonium amounts were lost with organic COD addition. It suggested that the methanogenesis in the system could enhance ANAMMOX because of intermediate hydrogen produced during methanogenesis.
本研究在膨胀颗粒污泥床（EGSB）反应器中对甲烷生成与反硝化和厌氧氨氧化（ANAMMOX）的集成进行了研究。对含有亚硝酸盐和铵的废水进行连续107天处理的实验结果表明，高亚硝酸盐和铵含量的废水可在膨胀颗粒污泥床反应器中进行厌氧处理。在高达约3.9 g COD/（L×d）的COD容积负荷率下，超过91%至97%的COD被去除。在高达约0.8 g NO2(-)-N/（L×d）的情况下，超过97%至100%的亚硝酸盐被反硝化，这比传统硝化/反硝化活性污泥系统（0.05 gN/（L×d））高16倍。该过程中未发生亚硝酸盐异化还原为铵的情况。然而，发现最多约40%的铵流失。对来自该反应器的污泥进行的为期15天的批次试验表明，当仅向污泥悬浮介质中添加铵（34.3 mg/L）和亚硝酸盐（34.3 mg/L）时，100%的亚硝酸盐被完全反硝化，约3%的铵被去除。此外，添加有机COD时约15%的铵量流失。这表明系统中的甲烷生成可因甲烷生成过程中产生的中间氢而增强ANAMMOX。
