Eslami Hadi, Ehrampoush Mohammad Hassan, Falahzadeh Hossein, Hematabadi Parvaneh Talebi, Khosravi Rasoul, Dalvand Arash, Esmaeili Abbas, Taghavi Mahmoud, Ebrahimi Ali Asghar
Department of Environmental Health Engineering, School of Health, Rafsanjan University of Medical Science, Rafsanjan, Iran.
Environmental Science and Technology Research Center, Department of Environmental Health Engineering, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
AMB Express. 2018 Jan 8;8(1):3. doi: 10.1186/s13568-017-0532-9.
In this study, the efficiency of Integrated Fixed-film Activated Sludge (IFAS) system in synthetic greywater treatment and nutrients removal was studied in duration of 105 days according to different Organic Loadings Rates (OLRs). The study was operated in pilot-scale and OLRs of 0.11-1.3 gCOD/L.d. Scanning Electron Microscope (SEM) image showed that the biofilm with a proper thickness was formed on IFAS reactor's media. The results indicated that the best removal efficiency of BOD, COD, and TSS were 85.24, 92.52 and 90.21%, respectively, in an organic loading of 0.44 gCOD/L.d. Then, with the OLR increased, the removal efficiencies of BOD, COD, and TSS increased as long as the organic loading reached 0.44 gCOD/L.d. But with the OLR increased more, the removal efficiency of these parameters decreased. The ANOVA statistical test results showed that the mean difference of removal efficiency in organic loadings for BOD (p ≤ 0.001) and COD (p = 0.003) was significant, while it was insignificant for TSS (p = 0.23). The best removal efficiencies of Total Nitrogen (TN) and Total Phosphorus (TP) were 89.60 and 86.67%, respectively, which were obtained at an OLR of 0.44 gCOD/L.d. By increasing OLR up to 0.44 gCOD/L.d, removal efficiencies of TN and TP increased, while the removal efficiency decreased with the OLR increased more, and this difference was statistically significant (p = 0.021). Finally, the results showed that the IFAS system provided a proper efficiency in treatment of the synthetic greywater and it could be used in a full scale.
在本研究中，根据不同的有机负荷率（OLR），在105天的时间内对集成固定膜活性污泥（IFAS）系统处理合成灰水和去除营养物质的效率进行了研究。该研究在中试规模下进行，OLR为0.11 - 1.3 gCOD/L·d。扫描电子显微镜（SEM）图像显示，IFAS反应器的介质上形成了厚度合适的生物膜。结果表明，在有机负荷为0.44 gCOD/L·d时，BOD、COD和TSS的最佳去除效率分别为85.24%、92.52%和90.21%。然后，随着OLR的增加，BOD、COD和TSS的去除效率在有机负荷达到0.44 gCOD/L·d之前一直增加，但随着OLR进一步增加，这些参数的去除效率下降。方差分析（ANOVA）统计测试结果表明，BOD（p≤0.001）和COD（p = 0.003）在有机负荷下的去除效率平均差异显著，而TSS（p = 0.23）则不显著。总氮（TN）和总磷（TP）的最佳去除效率分别为89.60%和86.67%，在OLR为0.44 gCOD/L·d时获得。通过将OLR提高到0.44 gCOD/L·d，TN和TP的去除效率增加，而随着OLR进一步增加，去除效率下降，且这种差异具有统计学意义（p = 0.021）。最后，结果表明IFAS系统在处理合成灰水方面具有适当的效率，可用于全规模应用。
