复合底物对颗粒化EBPR系统除磷特性的影响及优化试验研究

Effects of Composite Substrates on the Phosphorus Removal in Granule-based EBPR System and Its Optimization Experiment

以成熟除磷颗粒污泥为基础,基于获得的最佳混合碳源配比,通过正交试验研究了复合底物[m(C)/m(N)/m(P)]对颗粒化EBPR系统稳定过程除磷特性的影响.结果表明,R2[m(C)/m(N)/m(P)=400∶10∶5]、R3[m(C)/m(N)/m(P)=600∶10∶10]、R5[m(C)/m(N)/m(P)=400∶20∶15]系统发生了丝状菌颗粒污泥膨胀;R6[m(C)/m(N)/m(P)=600∶20∶5]系统因出现大量颗粒碎片导致沉降性能变差,待颗粒碎片排出系统后恢复正常.R3、R8[m(C)/m(N)/m(P)=400∶30∶10]、R9[m(C)/m(N)/m(P)=600∶30∶15]系统的颗粒粒径从初始的0.8 mm逐渐下降至0.3 mm,其余系统则与初始相差不多.R1[m(C)/m(N)/m(P)=200∶10∶15]、R4[m(C)/m(N)/m(P)=200∶20∶10]和R7[m(C)/m(N)/m(P)=200∶30∶5]系统在厌氧段消耗了95%的COD,释磷/吸磷速率分别在60～100 mg·(g·h)-1、60～80 mg·(g·h)-1、40～60 mg·(g·h)-1的范围内波动,且相对稳定,但其余系统的COD由主要在厌氧段消耗逐渐变为在好氧段消耗,释磷/吸磷速率亦逐渐下降,甚至有系统下降至0 mg·(g·h)-1.R1～R9系统的磷酸盐平均去除率分别是83.5%、52.8%、7.1%、96.7%、19.7%、72.2%、79.7%、28.1%和48.7%.对正交试验结果应用方差分析,获得适合颗粒化EBPR系统稳定运行的最佳复合底物条件是m(C)/m(N)/m(P)=200∶20∶15.

Based on the mature granular sludge,effects of composite substrates[m（C）/m（N）/m（P）] on the process of phosphorus removal in granule-based EBPR system was conducted by the optimal mixed-carbon sources ratio.Results showed that it was observed with the expanded filamentous bulking to granular sludge in the system of R2[m（C）/m（N）/m（P）=400∶10∶5],R3[m（C）/m（N）/m（P）=600∶10∶10] and R5[m（C）/m（N）/m（P）=400∶20∶15].The presence of large amount of granular fragments led to the poor performance of R6[m（C）/m（N）/m（P）=600∶20∶5],and it returned back after the particulate debris was removed off the system.The particle size of R3,R8[m（C）/m（N）/m（P）=400∶30∶10] and R9[m（C）/m（N）/m（P）=600∶30∶15）] gradually decreased from 0.8 mm to 0.3 mm,and other systems were similar to the initial size.More than 95 percent of the COD was consumed in the anaerobic stage in R1[m（C）/m（N）/m（P）=200∶10∶15],R4[m（C）/m（N）/m（P）=200∶20∶10] and R7[m（C）/m（N）/m（P）=200∶30∶5],and the phosphorus release/uptake rates fluctuated within the range of 60-100 mg·（g·h）^-1,60-80 mg·（g·h）^-1 and 40-60 mg·（g·h）^-1,respectively.However,the COD consumption was mainly occurred in aerobic stage in other systems,and the phosphorus release/uptake rates gradually declined,even decreased to 0 mg·（g·h）^-1.Phosphate removal rate of each system was（from R1 system to R9 system） 83.5%,52.8%,7.1%,96.7%,19.7%,72.2%,79.7%,28.1% and 48.7%,respectively.Finally,we also found that the optimal composite substrate condition for the granule-based EBPR system was the ratio of the m（C）/m（N）/m（P）=200∶20∶15.