| FNA对好氧吸磷的长期抑制及污泥吸磷方式转化 |
| 摘要点击 3251 全文点击 1676 投稿时间：2015-03-23 修订日期：2015-05-19 |
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| 中文关键词 游离亚硝酸(FNA) 好氧吸磷 长期 抑制 转化 |
| 英文关键词 free nitrous acid(FNA) aerobic phosphate uptake long-term inhibition variation |
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| 中文摘要 |
| 本研究采用交替厌氧/好氧(An/O)SBR反应器,在21~23℃ 的条件下启动系统并长期投加亚硝酸盐,考察游离亚硝酸(FNA)对系统好氧吸磷性能的长期抑制作用及驯化后污泥吸磷方式的转化. 结果表明,投加FNA后,污泥的释磷和吸磷能力不仅未受到抑制,比释磷速率和比吸磷速率反而高于投加前. FNA浓度(以HNO2-N计)低于0.53×10-3 mg·L-1时,系统除磷率均大于96.9%;当FNA浓度提高至0.99×10-3、1.46×10-3、1.94×10-3 mg·L-1时,系统除磷率均会大幅下降,分别经过50、12、30 d的运行,除磷率恢复至64.42%、67.33%、44.14%,说明抑制作用导致的除磷性能恶化可以恢复且长期驯化作用能缩短恢复过程. 值得注意的是,在低于1.46×10-3 mg·L-1范围内,随着FNA投加量的提高,好氧段亚硝酸盐的损失量不断增大. 研究还发现,经FNA长期抑制的好氧除磷系统内污泥吸磷方式发生转变,硝酸盐型和亚硝酸盐型缺氧吸磷能力分别为驯化前的3.35倍和3.86倍,说明长期投加FNA有利于富集以NO2-为电子受体的反硝化聚磷菌;而且,长期驯化有利于系统内污泥的沉降. |
| 英文摘要 |
| An alternating anaerobic/oxic (An/O) sequencing batch reactor (SBR) was employed to investigate the long-term inhibitory effect of free nitrous acid(FNA) on aerobic phosphorus uptake performance and variation of phosphorus uptake properties of the sludge by adding nitrite.The reactor was started up under the condition of 21-23℃.The results showed that FNA had no impact on phosphate release and uptake capacities of the sludge.However, the specific phosphate release/uptake rates was found to be higher.As FNA concentration (measure by HNO2-N) was lower than 0.53×10-3 mg·L-1, phosphorus removal efficiency of the system was higher than 96.9%.When the FNA concentration was increased to 0.99×10-3 mg·L-1, 1.46×10-3 mg·L-1 and 1.94×10-3 mg·L-1, the phosphorus removal performance deteriorated rapidly.The phosphorus removal efficiency was recovered to 64.42%, 67.33% and 44.14% after 50, 12 and 30 days, respectively, which implied the deterioration of phosphorus removal performance caused by FNA inhibition could be recovered and long-term acclimation could shorten the recovery process.Notably, increasing nitrite consumption appeared during aerobic phase with the concentration of FNA below 1.46×10-3 mg·L-1.It was also observed that the phosphorus uptake properties of the sludge varied after long-term inhibition.Nitrate and nitrite type anoxic phosphorus uptake capacity was increased by 3.35 and 3.86 times, respectively, suggesting long-term dosing FNA may facilitate the denitrifying of polyphosphate in organisms utilizing nitrite as electron acceptor.Moreover, long-term acclimation favored sludge settling. |
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