| 低温低溶解氧EBPR系统的启动、稳定运行及工艺失效问题研究 |
| 摘要点击 2194 全文点击 1256 投稿时间：2014-06-04 修订日期：2014-07-15 |
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| 中文关键词 低温 低溶解氧 EBPR 启动 失效 |
| 英文关键词 low temperature low DO EBPR startup failure |
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| 中文摘要 |
| 试验采用交替厌氧/好氧(An/O)SBR反应器,在温度为13~16℃的条件下启动并运行EBPR系统. 研究表明,进水磷浓度20 mg·L-1,控制DO浓度为2 mg·L-1,低温条件下即可在短期内(<6 d)实现EBPR系统的成功启动并获得高效稳定的除磷性能,出水磷浓度低于0.5 mg·L-1. 降低DO浓度会影响EBPR系统的稳定运行效果,反应器好氧阶段DO浓度由2 mg·L-1降为1 mg·L-1,系统仍可以稳定运行,磷的去除率均大于97.4%,但厌氧释磷量略有下降; DO浓度进一步降至0.5 mg·L-1时,EBPR系统除磷性能迅速恶化且出水磷浓度超标. 通过提高溶解氧浓度以恢复EBPR除磷性能的试验发现,低DO导致的系统失效在短期内不可逆. 研究还发现,以NO2-及NO3-为电子受体的缺氧除磷小试对EBPR系统的稳定运行具有冲击作用,但由此产生的不利影响可在6个周期内得以恢复; 此外,长期低温运行的EBPR系统内MLSS基本保持恒定且SVI略有降低,说明低温低DO条件有利于系统内污泥的沉降. |
| 英文摘要 |
| A sequencing batch reactor (SBR) was started up and operated with alternating anaerobic/oxic (An/O) to perform enhanced biological phosphorus removal (EBPR) under the condition of 13-16℃. The results showed that under the condition of low temperature, the EBPR system was successfully started up in a short time (<6 d). The reactor achieved a high and stable phosphorus removal performance with an influent phosphate concentration of 20 mg·L-1 and the dissolved oxygen (DO) concentration of 2 mg·L-1. The effluent phosphate concentration was lower than 0.5 mg·L-1. It was found that decreasing DO had an influence on the steady operation of EBPR system. As DO concentration of aerobic phase decreased from 2 mg·L-1 to 1 mg·L-1, the system could still perform EBPR and the phosphorus removal efficiency was greater than 97.4%. However, the amount of phosphate released during anaerobic phase was observed to decrease slightly compared with that of 2 mg·L-1 DO condition. Moreover, the phosphorus removal performance of the system deteriorated immediately and the effluent phosphate concentration couldn't meet the national integrated wastewater discharge standard when DO concentration was further lowered to 0.5 mg·L-1. The experiments of increasing DO to recover phosphorus removal performance of the EBPR suggested the process failure resulted from low DO was not reversible in the short term. It was also found that the batch tests of anoxic phosphorus uptake using nitrite and nitrate as electron acceptors had an impact on the stable operation of EBPR system, whereas the resulting negative influence could be recovered within 6 cycles. In addition, the mixed liquid suspended solids (MLSS) of the EBPR system remained stable and the sludge volume index (SVI) decreased to a certain extend in a long run, implying long-term low temperature and low DO condition favored the sludge sedimentation. |
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