Chen Yinguang, Randall Andrew A, McCue Terrence
Department of Civil & Environmental Engineering, University of Central Florida, Orlando, FL 32816-2450, USA.
Water Res. 2004 Jan;38(1):27-36. doi: 10.1016/j.watres.2003.08.025.
The effect of different ratios of propionic to acetic acid on the efficiency of enhanced biological phosphorus removal (EBPR) from real wastewater supplemented with volatile fatty acids (VFAs) was investigated. Two sequencing batch reactors (SBRs) were used to acclimate two types (SBR1 and SBR2) of biomass. They were cultured and studied using real wastewater with an average propionic to acetic acid carbon molar ratio of 0.16 and 2.06, respectively. The laboratory results showed that for a given long-term cultured biomass the more the soluble ortho-phosphate (SOP) was released in the anaerobic stage, the higher the SOP was taken up in the aerobic phase. However, the SBR2 biomass had a much greater SOP uptake to release ratio than SBR1, which resulted in a higher SOP removal efficiency than SBR1 (average 87.3% versus 76.9% in SBRs experiments, and 93.5% against 68.1% in batch tests). The SBR2 biomass therefore had a higher SOP uptake ability than the SBR1 for a given amount of SOP release. In addition, the SBR1 had a higher secondary SOP release following VFAs uptake. It was found that the SBR2 biomass synthesized and utilized less observable polyhydroxyalkanoates (PHAs) during the anaerobic and aerobic stage respectively than SBR1. The apparent PHAs utilization efficiency for SOP uptake with the SBR2 biomass was much greater than with the SBR1, and the SBR2 biomass synthesized less glycogen during aerobiosis than SBR1, which might mean a higher PHAs fraction was used for SOP removal, resulting in the increased efficiency with the long-term cultured SBR2 biomass. Higher propionic acid content led to superior EBPR in long-term cultivation, but was transiently detrimental in the short term.
研究了丙酸与乙酸的不同比例对补充挥发性脂肪酸（VFA）的实际废水中强化生物除磷（EBPR）效率的影响。使用两个序批式反应器（SBR）来驯化两种类型（SBR1和SBR2）的生物质。分别使用平均丙酸与乙酸碳摩尔比为0.16和2.06的实际废水对它们进行培养和研究。实验室结果表明，对于给定的长期培养生物质，厌氧阶段释放的可溶性正磷酸盐（SOP）越多，好氧阶段对SOP的吸收就越高。然而，SBR2生物质的SOP吸收与释放比远高于SBR1，这导致其SOP去除效率高于SBR1（SBR实验中平均为87.3%对76.9%，批次试验中为93.5%对68.1%）。因此，对于给定的SOP释放量，SBR2生物质比SBR1具有更高的SOP吸收能力。此外，SBR1在吸收VFA后具有更高的二次SOP释放。研究发现，SBR2生物质在厌氧和好氧阶段分别比SBR1合成和利用的可观察到的聚羟基烷酸酯（PHA）更少。SBR2生物质用于吸收SOP的表观PHA利用效率远高于SBR1，并且SBR2生物质在需氧过程中合成的糖原比SBR1少，这可能意味着更高比例的PHA用于去除SOP，从而导致长期培养的SBR2生物质效率提高。较高的丙酸含量在长期培养中导致更好的EBPR，但在短期内具有短暂的不利影响。
