温度和游离氨对颗粒与絮状污泥硝化性能影响的对比研究

Effects of Temperature and Free Ammonia Concentration on Nitrification Between the Aerobic Granular and the Floccular Sludges

采用批式试验,考察了不同温度(10、15、20、25、30℃)及室温下不同游离氨质量浓度(1.76、8.23、14.68、26.52、46.23、90.00 mg/L)对好氧颗粒污泥和絮状污泥硝化作用的影响.结果表明,随着温度的升高,好氧颗粒污泥和絮状污泥的比氨氧化速率均增大,而在相同温度下,好氧颗粒污泥的硝化能力更强,比氨氧化速率分别是絮状污泥的4.5倍(10℃)和2.5倍(30℃).游离氨的试验表明,在游离氨质量浓度为90.00 mg/L时,游离氨对颗粒污泥硝化性能无明显抑制作用,但对絮状污泥抑制作用明显,比氨氧化速率比上一梯度减小了约43%,原因是氨氧化菌均布于絮状污泥中,与氨氮接触充分,易受到抑制,而好氧颗粒污泥的表面生物特征影响氨氮传质速率,使其具有抗高氨氮负荷冲击的优势,可见颗粒污泥在维持生物脱氮系统稳定方面具有较大潜力.

Using batch tests, the nitrifying performances were investigated at different temperatures （10, 15, 20, 25, 30 ℃） and free ammonia （FA） concentration p（FA） （1.76, 8.23, 14.68, 26.52, 46.23, 90.00 mg/L） between the Aerobic granular sludge （AGS） and the Floccular sludge （FS）. Results show that the specific ammonia oxidation rates of AGS and FS significantly increase with the temperature, however, at the same temperature, the ammonia oxidation rate of AGS is 4.5 times（ 10 ℃ ） and 2.5 times （30 % ） of that of FS. When p （FA） = 90.00 mg/L, experiments show that FA has no significant inhibitory effect on AGS but FS, the ammonia oxidation rate of FS decreases by 43% compared with last FA level. This is because the stronger resistance of AGS to the transfer of ammonia into the bacterial aggregates may make it appear to be more tolerant to FA. But in the FS, distributing throughout the entire aggregates, the ammonia oxidizing bacteria （AOB） are more possibly inhibited under high FA loading rate. It can be concluded that the AGS has great potential in withstanding high ammonia loading and maintaining the stability of the biological nitrogen removal performance.