Thermophilic anaerobic digestion of high strength wastewaters
Thermophilic anaerobic digestion of high strength wastewaters
复制标题
高浓度废水的高温厌氧消化
DOI：
10.1002/bit.260270915
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发表时间：
1985
影响因子：
3.8
通讯作者：
G. Lettinga
中科院分区：
文献类型：
--
作者：
W. Wiegant;J. Claassen;G. Lettinga
介绍了对高浓度废水（14 - 65 kg COD/m3）的高温厌氧处理的研究。酒糟，酒精酿造厂的废水，被用作这种废水的一个例子。在高保留时间下的半连续进料消化实验表明，在55°C下消化的流出物质量与在30°C下在类似的加载速率下消化的流出物质量相当。每千克酒糟形成的甲烷量随着酒糟浓度的增加几乎线性下降。这可归因于抑制性化合物的浓度增加，导致流出物中挥发性脂肪酸（VFA）浓度增加。采用上流式厌氧污泥床（UASB）反应器处理酒糟。嗜热颗粒污泥，培养蔗糖，被用作种子材料。污泥需要4个月的适应期，在此期间，污泥颗粒的尺寸显著减小。然而，沉降特性仍然令人满意。适应后，高负荷和甲烷产生率可以容纳在令人满意的处理效率，即86.4公斤COD/立方米的天和26立方米CH 4（STP）/立方米的天，分别。如在连续进料的消化器中，流出物VFA浓度实际上与施加的加载速率无关，这表明在确定酒糟转化为甲烷的效率时，酒糟的毒性比加载速率更重要。
Investigations on the thermophilic anaerobic treatment of high‐strength wastewaters (14‐65 kg COD/m3) are presented. Vinasse, the wastewater of alcohol distilleries, was used as an example of such wastewaters. Semicontinuously fed digestion experiments at high retention times revealed that the effluent quality of digestion at 55°C is comparable with that at 30°C at similar loading rates. The amount of methane formed per kilogram of vinasse drops almost linearly with increasing vinasse concentrations. This can be attributed to increasing concentrations of inhibitory compounds, resulting in increasing volatile fatty acid (VFA) concentrations in the effluent. The treatment of vinasse was also investigated using upflow anaerobic sludge blanket (UASB) reactors. Thermophilic granular sludge, cultivated on sucrose, was used as seed material. The sludge required a 4‐month adaptation period, during which the size of the sludge granules decreased significantly. However, the settling characteristics remained satisfactory. After adaptation, high loading and methane generation rates could be accommodated at satisfactory treatment efficiencies, namely, 86.4 kg COD/m3 day and 26 m3 CH4(STP)/m3 day, respectively. As in the semicontinuously fed digesters, the effluent VFA concentrations were virtually independent of the loading rates applied, indicating that the toxicity of the vinasse is more important than the loading rate in determining the efficiency of the conversion of vinasse to methane.