Effect of Stillage Pretreatment During a Coupled Scoria-Supported Anaerobic Digestion Followed by Aerobic Degradation

IF 3.5 Q2 ENVIRONMENTAL SCIENCES

Air Soil and Water Research Pub Date : 2021-01-01 DOI:10.1177/1178622121991810

G. D. Gebreeyessus, A. Mekonnen, Y. Chebude, P. Asaithambi, T. Sreekrishnan, E. Alemayehu

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Abstract

The objective of this study was to evaluate the treatment efficiency of a coupled stillage anaerobic digestion, which was performed in scoria-packed continuous reactors and following aerobic degradation. The optimum organic loading rate was determined for the continuous anaerobic digestion of a molasses ethanol distillery stillage with and without wet air feed pretreatment. The pretreatment of the molasses ethanol distillery stillage brought a significantly higher chemical oxygen demand removal in anaerobic digestion with an increased loading rate of 2000 mg/L d when compared with the raw stillage. The results also showed a complete removal of the biological oxygen demand following the coupling of anaerobic digestion with aerobic degradation. During the later stillage aerobic treatment, 68% of the chemical oxygen demand was removed within 8 hours of retention time. Despite the color, the removal of organics in stillage due to integrating wet air pretreatment, continuous anaerobic digestion, and aerobic degradation was successful. The pretreatment and hybrid technique also appears as a promising technique toward the sustainable management of stillage, thereby meeting discharge limit set for the ethanol industry by regulators.

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污泥预处理对Scoria支持厌氧消化-好氧降解过程的影响

本研究的目的是评估耦合釜式厌氧消化的处理效率，该消化在焦渣填充的连续反应器中进行，并在好氧降解后进行。确定了糖蜜乙醇蒸馏釜在有和无湿空气进料预处理的情况下进行连续厌氧消化的最佳有机负荷率。糖蜜乙醇蒸馏釜的预处理显著提高了厌氧消化的化学需氧量去除率，负荷率提高了2000 mg/L d。结果还表明，厌氧消化与好氧降解相结合后，生物需氧量完全去除。在后期的蒸馏好氧处理中，68%的化学需氧量在保留时间的8小时内被去除。尽管有颜色，但由于湿空气预处理、连续厌氧消化和好氧降解相结合，对釜液中的有机物的去除是成功的。预处理和混合技术也被认为是一种很有前途的技术，可以实现蒸馏物的可持续管理，从而达到监管机构为乙醇行业设定的排放限制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Air Soil and Water Research ENVIRONMENTAL SCIENCES-

CiteScore

7.80

自引率

5.30%

发文量

审稿时长

8 weeks

期刊介绍： Air, Soil & Water Research is an open access, peer reviewed international journal covering all areas of research into soil, air and water. The journal looks at each aspect individually, as well as how they interact, with each other and different components of the environment. This includes properties (including physical, chemical, biochemical and biological), analysis, microbiology, chemicals and pollution, consequences for plants and crops, soil hydrology, changes and consequences of change, social issues, and more. The journal welcomes readerships from all fields, but hopes to be particularly profitable to analytical and water chemists and geologists as well as chemical, environmental, petrochemical, water treatment, geophysics and geological engineers. The journal has a multi-disciplinary approach and includes research, results, theory, models, analysis, applications and reviews. Work in lab or field is applicable. Of particular interest are manuscripts relating to environmental concerns. Other possible topics include, but are not limited to: Properties and analysis covering all areas of research into soil, air and water individually as well as how they interact with each other and different components of the environment Soil hydrology and microbiology Changes and consequences of environmental change, chemicals and pollution.