Wu Sarah Xiao, Zhu Jun, Chen Lide
a Department of Biological Engineering , University of Idaho , Moscow , Idaho , USA.
b Department of Biological and Agricultural Engineering , University of Arkansas , Fayetteville , AR , USA.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2017 Jul 3;52(8):718-726. doi: 10.1080/10934529.2017.1301748. Epub 2017 Mar 30.
This study was undertaken to investigate the effect of two split feeding schemes (600 mL/200 mL and 400 mL/400 mL, designated as FS1 and FS2, respectively) on the performance of a step-fed sequencing batch reactor (SBR) in treating liquid swine manure for nutrient removal. The SBR was run on an 8-h cycle with a repeated pattern of anaerobic/anoxic/aerobic phases in each cycle and the two feedings always occurred at the beginning of each anaerobic phase. A low-level aeration was used (1.0 L/m.sec) for the anoxic/aerobic phase to facilitate nitrification and phosphorus uptake while reducing the energy consumption. The results showed that FS1 reduced NH-N by 98.7% and FS2 by 98.3%. FS1 had 12.3 mg/L NO-N left in the effluent, while FS2 had 4.51 mg/L. For soluble phosphorus removal, FS1 achieved 95.2%, while FS2 reached only 68.5%. Both feeding schemes achieved ≥ 95% removal of COD. A good power regression was observed between total nitrogen (sum of all three nitrogen species) and the carbon to nitrogen (C/N) ratio, with the correlation coefficients of 0.9729 and 0.9542 for FS1 and FS2, respectively, based on which it was concluded that higher C/N ratios were required to achieve higher nitrogen removal efficiencies.
本研究旨在调查两种分段进料方案（分别为600毫升/200毫升和400毫升/400毫升，分别指定为FS1和FS2）对分步进料序批式反应器（SBR）处理液态猪粪以去除养分性能的影响。SBR以8小时为一个周期运行，每个周期中厌氧/缺氧/好氧阶段重复出现，且两次进料均在每个厌氧阶段开始时进行。在缺氧/好氧阶段采用低水平曝气（1.0升/米·秒），以促进硝化作用和磷的吸收，同时降低能耗。结果表明，FS1使氨氮减少了98.7%，FS2使其减少了98.3%。FS1的出水剩余12.3毫克/升的硝态氮，而FS2的为4.51毫克/升。对于溶解性磷的去除，FS1达到了95.2%，而FS2仅达到68.5%。两种进料方案对化学需氧量（COD）的去除率均≥95%。观察到总氮（所有三种氮形态的总和）与碳氮比（C/N）之间存在良好的幂回归关系，FS1和FS2的相关系数分别为0.9729和0.9542，据此得出结论，需要更高的C/N比才能实现更高的氮去除效率。
