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Effect of precipitating agents on centrifugation and ultrafiltration performance of thin stillage digestate

机译：沉淀剂对稀釜馏物离心分离和超滤性能的影响

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摘要

The EU Renewable Energy Directive 2009/28/EC demands bioethanol plants to reduce their greenhouse gas emissions. This can be achieved by integrating a biogas plant in the bioethanol process and consequently by using the bioethanol by-products (e.g. thin stillage) as feedstock for anaerobic digestion. Due to the large amounts of thin stillage and consequently of digestate an efficient digestate treatment is essential. For this purpose centrifugation and ultrafiltration of thin stillage digestate with and without addition of precipitating agents were carried out. Prior to centrifugation, which was carried out with a disc-stack centrifuge at pilot scale, precipitating agents (iron(III)chloride and carbonated lime) were added. The produced supernatant fractions were then used for ultrafiltration experiments, which were carried out with a alpha Al2O3-membrane (pore size: 50 nm). Cross flow velocity and trans membrane pressure were adjusted to 6 m s(-1) and to 0.8*10(5) Pa. The addition of precipitating agents increased the separation efficiency of the suspended solids from 46% to 75%. Furthermore the flux during ultrafiltration increased from 45-50 L m(-2) h(-1) to 79 L m(-2) h(-1). In addition, phosphorous could be practically entirely removed from the supernatant with the precipitating agents. For a large-scale bioethanol plant it was proposed to reutilise the digestate fractions as process water. However, depending on its influence on the process and on animal feed quality, different digestate treatment processes should be applied. (C) 2015 Elsevier B.V. All rights reserved.
机译：欧盟可再生能源指令2009/28 / EC要求生物乙醇工厂减少其温室气体排放。这可以通过将沼气装置整合到生物乙醇工艺中来实现，因此可以通过使用生物乙醇副产物（例如稀釜馏物）作为厌氧消化的原料来实现。由于大量的稀釜馏物以及因此的消化，有效的消化处理是必不可少的。为此目的，在有和没有添加沉淀剂的情况下，对稀釜馏物消化物进行离心和超滤。离心之前，先通过碟片式离心机在中试规模下进行离心，然后加入沉淀剂（氯化铁（III）和碳酸钙）。然后将产生的上清液级分用于超滤实验，该实验用αAl2O3-膜（孔径：50 nm）进行。错流速度和跨膜压力分别调节为6 m s（-1）和0.8 * 10（5）Pa。添加沉淀剂可使悬浮固体的分离效率从46％提高至75％。此外，超滤过程中的通量从45-50 L m（-2）h（-1）增加到79 L m（-2）h（-1）。另外，实际上可以用沉淀剂从上清液中完全除去磷。对于大型生物乙醇工厂，建议将消化的馏分重新用作工艺用水。但是，根据其对加工过程和动物饲料质量的影响，应采用不同的消化处理工艺。 （C）2015 Elsevier B.V.保留所有权利。

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