Anaerobic digestion of total raw olive-oil wastewater in a two-stage pilot-plant (up-flow and fixed-bed bioreactors)
Anaerobic digestion of total raw olive-oil wastewater in a two-stage pilot-plant (up-flow and fixed-bed bioreactors)
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在两级中试装置（上流式和固定床生物反应器）中对总橄榄油废水进行厌氧消化
DOI：
10.1016/s0960-8524(96)00051-x
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发表时间：
1996
影响因子：
11.4
通讯作者：
L. Hartmann
中科院分区：
文献类型：
--
作者：
D. Dalis;K. Anagnostidis;A. López;I. Letsiou;L. Hartmann
在串联反应器的两阶段中试装置中进行了一项研究，以评估总原料橄榄油废水的厌氧消化。使用了两种不同类型的厌氧消化器，上流式和固定床型。研究的主要目的是评估上流式反应器与固定床型反应器串联工作的性能，固定床型反应器作为补充处理。中试系统在中温环境（35±1°C）下运行约390天，有机负荷水平在2.8至12.7 g COD/l.d之间。在原废水中加入浓氨水，将C/N调节至20/1的最佳值，也使沼池内pH值稳定在中性范围内。在连续7次试验中，第一阶段（上流式沼气池）的最佳比产气率稳定在2.1升/升沼气池。COD降低了83%，非常令人满意（体积负荷为11 g /l.day）。在第二阶段（固定床沼气池），沼气产量稳定在0.22升/升沼气池。COD降低8%（容量负荷为0.19 g COD/l.d）。根据文献报道的总原废水的结果，应用系统的性能在沼气生产，COD降低和负载率方面是迄今为止报道的最好的，特别是对于上流式沼气池。在厌氧消化过程中，酚类物质在两个消化池中都有明显的降低，上流式消化池中酚类物质的浓度降低达到75%；使用第二阶段（固定床反应器），进一步降低了45%。鉴于上述令人鼓舞的结果，我们可以建议采用上流式沼气池作为一种经济有效的处理方法，以显着降低总原废水的有机负荷。使用固定床式沼气池与先前的沼气池串联，作为第二个处理阶段，可能会得到更令人满意的结果。
A study was undertaken to evaluate the anaerobic digestion of total raw olive-oil wastewater in a two-stage pilot-plant with reactors connected in series. Two different types of anaerobic digesters were used, an up-flow type and a fixed-bed type. The main pupose of the study was to evaluate the performance of an up-flow-type reactor working in series with a fixed-bed-type reactor, which was used as a complementary treatment. The pilot-plant system operated in the mesophilic range (35 ± 1°C) during approximately 390 days, and with organic loading levels that ranged between 2.8 and 12.7 g COD/l.day. Concentrated aqueous ammonia was added to the total raw wastewater to adjust the C/N ratio to the optimum value of 20/1, and this also achieved stabilisation of the pH values in the digesters within a range about neutrality. In a series of seven consecutive experiments, for the first stage (up-flow digester) optimum values of specific biogas production rate stabilised at a value of 2.1 litres/litre digester.day with a very satisfactory COD reduction of 83% (with a volumetric load of 11 g COD/l.day). For the second stage (fixed-bed digester), the biogas production rate stabilised at a value of 0.22 litres/litre digester.day with a COD reduction of 8% (with a volumetric load of 0.19 g COD/l.d). According to the results reported in the literature for total raw wastewater, the performance of the applied system is amongst the best for biogas production, COD reduction and loading rate reported so far, especially for the up-flow digester. Phenols were greatly reduced during the anaerobic digestion process in both digesters, with a concentration reduction which reached 75% in the up-flow digester; with the use of the second stage (fixed-bed reactor) a further reduction of 45% was obtained. With the above encouraging results we may suggest the employment of the up-flow type digester as an economical and effective treatment for significantly reducing the organic load of total raw wastewater. More satisfactory results might be expected from the use of a fixed-bed-type digester connected in series with a previous one, as a second treatment stage.