El-Gohary F, Tawfik A, Badawy M, El-Khateeb M A
National Research Center, Water Pollution Research Dept, Dokki, Giza, Egypt.
Bioresour Technol. 2009 Apr;100(7):2147-54. doi: 10.1016/j.biortech.2008.10.051. Epub 2008 Dec 12.
The catalytically oxidized olive mill wastewater (OMW) was subjected to continuous anaerobic treatment using two treatment schemes. The 1st step in both schemes was an up-flow anaerobic sludge blanket (UASB) reactor (20l). The 2nd step was either a hybrid UASB reactor or a classical one (10l, each). The 1st stage was operated at constant hydraulic retention time (HRT) of 24h. The organic loading rate (OLR) varied from 3.4 to 4.8 kg COD/m(3)d depending on the quality of the pretreated wastewater. The results obtained indicated that, the 1st step UASB reactor achieved a COD percentage removal value of 53.9%. Corresponding total BOD(5) and TSS removal were 51.5% and 68.3%, respectively. The results obtained indicated that the hybrid UASB reactor as a 2nd step produced better quality effluent as compared to the classical one. This could be attributed to the presence of the packing curtain sponge with active biomass in the sedimentation part of hybrid UASB reactor which minimizes suspended solids washout, consequently enhancement of the efficiency of the reactor. Available data showed that a two stage system consisting of a classical and a hybrid UASB reactor operated at a total HRT of 48h and OLR of 2.0 kg COD/m(3)d provided promising results. Removal values of COD(total), BOD(5 total), TOC, VFA, oil and grease were 83%, 84%, 81%, 93% and 81%, respectively. Based on the available data, the use of a two stage anaerobic system consisting of a classical UASB reactor followed by a hybrid UASB as a post-treatment step for catalytically oxidized OMW is recommended.
对催化氧化后的橄榄榨油废水（OMW）采用两种处理方案进行连续厌氧处理。两种方案的第一步均为上流式厌氧污泥床（UASB）反应器（20升）。第二步要么是混合型UASB反应器，要么是传统型UASB反应器（各10升）。第一阶段在24小时的恒定水力停留时间（HRT）下运行。有机负荷率（OLR）根据预处理废水的质量在3.4至4.8千克化学需氧量/立方米·天之间变化。所得结果表明，第一步的UASB反应器实现了53.9%的化学需氧量去除率。相应的总生化需氧量（BOD₅）和总悬浮固体（TSS）去除率分别为51.5%和68.3%。所得结果表明，作为第二步的混合型UASB反应器产生的出水质量优于传统型UASB反应器。这可能归因于混合型UASB反应器沉淀部分存在带有活性生物质的填料帘式海绵，这最大限度地减少了悬浮固体的冲出，从而提高了反应器的效率。现有数据表明，由传统型和混合型UASB反应器组成的两级系统在总HRT为48小时、OLR为2.0千克化学需氧量/立方米·天的条件下运行取得了良好的效果。化学需氧量（总）、生化需氧量（总BOD₅）、总有机碳（TOC）、挥发性脂肪酸（VFA）、油和油脂的去除率分别为83%、84%、81%、93%和81%。基于现有数据，建议使用由传统型UASB反应器后跟混合型UASB组成的两级厌氧系统作为催化氧化OMW的后处理步骤。
