基于优质碳源提供的CAMBR复合工艺短程硝化-反硝化除磷研究

挥发性脂肪酸(VFA)是反硝化除磷过程可以利用的优质碳源,为此本研究结合厌氧折流板反应器(ABR)微生物相分离和膜生物反应器(MBR)出水水质优良的特性,构建了CAMBR复合工艺,并通过优化ABR水力停留时间(HRT)等运行条件以提供优质碳源,实现高效反硝化除磷.研究表明,当ABR的HRT为4.8 h时,可获得充足的VFA作为优质碳源,并实现消耗VFA的量为56.1 mg·L~(-1)的同时获得10.43 mg·L~(-1)的释磷,即释放1 mg磷需要的VFA量为5.38 mg,同时实现12.35 mg·L~(-1)的吸磷,而MBR池的吸磷为1.33 mg·L~(-1).短程硝化除磷过程中,缺氧消耗1 mg PO_4~(3-)-P需要0.62 mg的NO-x-N,吸收1 mg PO_4~(3-)-P所需NO_2~--N的量为1.67~2.04 mg.系统出水水质稳定,COD、TN和溶解性PO_4~(3-)-P的平均去除率分别为91%、84%和93%,出水平均浓度分别为30、7.15和0.55 mg·L~(-1),表明CAMBR复合工艺生在处理生活污水过程中可获得稳定高效的反硝化除磷效果.

Shortcut Nitrosation-Denitrifying Phosphorus Removal Based on High-quality Carbon Source in Combined Process of CAMBR

The volatile fatty acids (VFAs) are high-quality carbon source which can be utilized in the process of denitrifying phosphorus removal. Therefore, a combined process of anaerobic baffled reactor (ABR) with microbial phase separation and membrane bioreactor (MBR), i. e. CAMBR, with high-quality effluent was investigated in this experiment for highly efficient denitrifying phosphorus removal through providing high-quality carbon source by optimizing operational conditions such as hydraulic retention time (HRT) in the ABR. The results indicated that sufficient high-quality carbon source VFA could be acquired when the HRT of ABR was 4.8 h. The consumption of VFA was 56.1 mg ·L^-1 while the release of phosphorus was 10.43 mg ·L^-1 showing that 5.38 mg of VFA was required to release 1 mg PO₄^3--P. Meanwhile, the uptake of phosphorus was 12.35 mg ·L^-1, while the uptake of phosphorus of MBR tank was 1.33 mg ·L^-1. In the process of shortcut nitrification, 0.62 mg NO_x^--N was needed when 1 mg PO₄^3--P was taken up, and 1.67 to 2.04 mg NO₂^--N was required when 1 mg PO₄^3--P was taken up, and the combined system achieved stable effluent quality. The average removal rates of COD, TN and soluble PO₄^3--P were 91%, 84% and 93%, respectively, correspondingly the average effluent concentrations were 30, 7.15 and 0.55 mg ·L^-1, respectively. The results stated that the CAMBR achieved stable and highly efficient denitrifying phosphorus removal in domestic sewage treatment.