Abstract

This study investigates the effectiveness of SBBR with low-cost textile fibers-based bio-carrier namely polypropylene fibers for the treatment of real sewage. The influent loading rates of COD, TN, and TP were averaged at 0.2780, 0.0170, and 0.0077 kg/m³.d, respectively. The removal efficiencies of BOD, COD, TN, and TP recorded in SBBR were 98%, 93%, 82%, and 44%, respectively at an aeration time of 4 h. The TN and TP removal achieved in SBBR were 2.05 and 2.75 times, respectively higher than SBR. The COD removal efficiency was more than 90% under all SRT conditions (10, 14, 18, 22, and 26 d) in SBBR, and the highest efficiency of 93% was obtained at an SRT of 22 days. As the SRT increased, the nitrogen and phosphorus removal decreased, because the denitrification rate and phosphorus release and uptake rate decreased at longer SRT. Simultaneous nitrification and denitrification (SND) efficiency was 85% in SBBR and 44% in SBR, indicating the co-existence of aerobic nitrifiers and anoxic denitrifiers in the biofilm reactor. In SBBR, the nitrogen mass balance showed 74% of nitrogen removed by denitrification, 9% was removed through sludge wasting process, and 13% was removed in effluent at an SRT of 22 days and DO concentration of 3 mg/L. The t-test results suggest that the performance of SBBR was better than SBR in nitrogen and phosphorus removal at a 95% confidence interval.

摘要

这项研究调查了SBBR与低成本的基于纺织纤维的生物载体，即聚丙烯纤维，用于处理实际污水的有效性。COD，TN和TP的进水负荷率平均为0.2780、0.0170和0.0077 kg / m ³.d。曝气时间为4 h时，SBBR中记录的BOD，COD，TN和TP的去除效率分别为98％，93％，82％和44％。SBBR中的TN和TP去除分别是SBR的2.05和2.75倍。在SBBR中，在所有SRT条件（10、14、18、22和26 d）下，COD去除效率均超过90％，而在22天的SRT下获得最高的效率为93％。随着SRT的增加，氮和磷的去除减少，这是因为在更长的SRT下反硝化率和磷的释放和吸收率降低。SBBR中的同时硝化和反硝化（SND）效率为85％，SBR中的同时硝化和反硝化（SND）效率为44％，表明生物膜反应器中需氧硝化器和缺氧反硝化器并存。在SBBR中，氮的质量平衡显示，通过反硝化去除了74％的氮，通过污泥浪费过程去除了9％的氮，在SRT为22天且DO浓度为3 mg / L的废水中去除了13％。t检验结果表明，在95％置信区间内，SBBR的氮和磷去除性能优于SBR。