海绵体积对下流式悬挂海绵系统处理 UASB 反应器出水性能的影响。
Effect of sponge volume on the performance of down-flow hanging sponge system treating UASB reactor effluent.
机构信息
Water Pollution Research Department, National Research Center, Dokki, Cairo, Egypt.
出版信息
Bioprocess Biosyst Eng. 2010 Sep;33(7):779-85. doi: 10.1007/s00449-009-0399-5. Epub 2009 Dec 15.
The performance of down-flow hanging sponge (DHS) system treating UASB reactor effluent at different sponge volume of 38.2, 28.7, 19.1 and 9.6% was investigated. The hydraulic retention time (HRT) and flow rate were kept constant at 2.6 h and 0.46 m(3)/day, respectively. The results obtained indicated that reducing the sponge volume of the DHS system from 38.2 to 19.1% significantly decreased the removal efficiency of COD(total) from 80 +/- 8 to 62 +/- 14%; COD(soluble) from 71.2 +/- 10 to 53.7 +/- 18% and COD(particulate) from 86 +/- 10 to 62 +/- 15%. With further reduction of the sponge volume down to 9.6%, the removal efficiency was dropped to 54 +/- 15% for COD(total); 44.1 +/- 14% for COD(soluble) and 42 +/- 12% for COD(particulate). Likewise, the nitrification efficiency and fecal coliform (FC) removal was strongly affected by decreasing the sponge volume of the DHS system, i.e., the nitrification efficiency was dropped by a value of 48.3% when reducing the sponge volume of the DHS system from 38.2 to 19.1%. At sponge volume of 38.2%, the DHS system removes 2.6 +/- 0.3 log(10)/100 ml of FC which is significantly higher than that at sponge volume of 28.7, 19.1 and 9.6%. Accordingly, it is recommended to design and operate such a system at a bulk sponge volume not exceeding 38.2% of the total reactor volume and at an HRT of 2.6 h.
下流式悬挂海绵（DHS）系统在不同海绵体积为 38.2%、28.7%、19.1%和 9.6%的条件下处理 UASB 反应器出水的性能进行了研究。水力停留时间（HRT）和流速分别保持在 2.6 h 和 0.46 m³/天。结果表明，将 DHS 系统的海绵体积从 38.2%减少到 19.1%，显著降低了 COD（总）的去除效率，从 80 ± 8%降至 62 ± 14%；COD（可溶性）从 71.2 ± 10%降至 53.7 ± 18%，COD（颗粒）从 86 ± 10%降至 62 ± 15%。进一步将海绵体积减少到 9.6%，COD（总）的去除效率降至 54 ± 15%；COD（可溶性）为 44.1 ± 14%，COD（颗粒）为 42 ± 12%。同样，硝化效率和粪大肠菌群（FC）的去除受到 DHS 系统中海绵体积减少的强烈影响，即当 DHS 系统的海绵体积从 38.2%减少到 19.1%时，硝化效率下降了 48.3%。在海绵体积为 38.2%时，DHS 系统去除了 2.6 ± 0.3 log（10）/100 ml 的 FC，显著高于海绵体积为 28.7%、19.1%和 9.6%时的值。因此，建议在总反应器体积不超过 38.2%的大块海绵体积和 2.6 h 的 HRT 下设计和运行这样的系统。
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