非稳定状态下除磷过程的特点研究

为了研究非稳定状态下生物除磷的特点,采用序批式间歇反应器(SBR),通过不同的进水方式(连续进水和瞬时进水),系统地考察了进水体积、NOX-N、限制曝气等因素对除磷过程的影响。结果表明,在温度为(23±0.5)℃、pH为7.0～8.0时,厌氧搅拌期连续进水的比释磷量(单位质量污泥(以MLSS计)的释磷量(以PO43-P计))比瞬时进水时高出42.11%。在运行条件相似的情况下,厌氧搅拌期的比释磷量与每周期进水体积无关。相对于连续进水,瞬时进水更有助于促进微生物利用有机底物进行自身的生长。限制曝气对连续进水和瞬时进水的释磷过程都存在明显的影响,在DO小于0.1mg/L的情况下,2者的比释磷量相对非限制曝气时分别降低了57.14%和55.56%。在连续进水时,NOX-N的反硝化结束伴随着释磷速率的突然升高。利用贮存作用并不能每次都成功地抑制丝状菌污泥膨胀。

Investigation the characteristics of phosphorus removal process under unstable conditions

In order to study the characteristics of biological phosphorus removal under unstable conditions, the author established batch experiments in sequencing batch reactor (SBR) using different feeding patterns (peristaltic feeding and impulse feeding) to investigate the effects of influent volume, NO_x~-,-N, limited aeration, and some other factors on phosphorus removal process. The results showed that, specific phosphorus release amount in peristaltic fed SBR was 42.11% more than that in impulse fed SBR during anaerobic stirring period at (23±0.5) ℃,and Ph of 7.0-8.0. There was no correlation between specific phosphorus release amount and influent volume in each cycle during an-aerobic period under similar operation conditions. Compared with peristaltic feeding, impulse feeding was more help-ful to promote microorganism growth using organic substrate. Limited aeration had obvious effects on phosphorus re-lease process for both peristaltic feeding and impulse feeding. Their specific phosphorus release amount were 57.14% and 55.56% lower than those under no limited aeration condition (DO<0.1 mg/L), respectively. In phosphorus re-lease process, the completion of NO_x~--N denitrification was associated with abruptly increase of phosphorus release rate. The inhabitation of filamentous bacteria sludge bulking by storage function was not guaranteed.