基于生物膜法磷回收工艺厌氧释磷研究

城市污水经过碳回收后的低碳源进水水质将对活性污泥法强化除磷（EBPR）工艺的运行带来困难.本研究基于生物膜法磷回收的序批式反应器（Biofilm-SBR）对低碳、低磷进水进行磷回收，在BSBR反应器好氧无碳源、厌氧低碳源投加的运行基础上，研究了该工艺在低碳模式下厌氧磷释放的关键影响因素.同时，研究了不同的碳源浓度和碳源投加方式对BSBR工艺释磷的影响.最后，分析了系统中生物膜蓄磷量的变化，并探究其与碳源消耗、释磷效果的量化关系.结果表明，该系统在好氧无碳源、厌氧仅200 mg·L^-1的碳源投加下，即可取得115 mg·L^-1（可溶性磷）的富磷回收液.系统的C_upt/P_rel（释放单位质量磷的COD消耗量）平均为（11.12±1.03）mg·mg^-1，最大蓄磷量为124 mg·g^-1.

The anaerobic phosphorus release of biofilm-based phosphorus recovery process

The municipal wastewater after recovery of organic carbons will bring difficulties to the operation of traditional enhanced phosphorus biological removal (EBPR) process. In this study, a biofilm sequencing batch reactor (BSBR) process was proposed to recover the phosphorus (P) of municipal wastewater with less organic carbon. The BSBR was operated without carbon additive in the aerobic phase and with low amount of carbon additive in the anaerobic phase. The effects of carbon concentration and the supply pattern on the P release of BSBR during the anaerobic phase were measured. Meanwhile, the quantitative relationship among the P content in the biofilm, carbon consumption and P release performance was explored. The P-concentrated recovery solution with 115 mg·L^-1 (soluble P) was obtained via only 200 mg·L^-1 addition in the anaerobic phase. The C_upt/P_rel of the BSBR was stable at (11.12±1.03) mg·mg^-1 and the maximum P content in the biofilm was 124 mg·g^-1.