Effect of Fe Addition on Anaerobic Digestion Process in Treating Vinasse: Experimental and Kinetic Studies

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-01-27 DOI:10.3311/ppch.20611

I. Syaichurrozi, S. Sarto, W. B. Sediawan, M. Hidayat

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引用次数: 2

Abstract

Vinasse is a continuously resulting waste by a bioethanol industry with a high chemical oxygen demand (COD) concentration and a large volume. Anaerobic digestion (AD) is the best method to treat vinasse because it converts COD to biogas, so the biogas can support the Indonesia's primary energy need. The goal of this study was to study the effect of Fe concentration on the AD process in treating the vinasse. The Fe concentration was varied to 0.06, 0.29, 0.64, 0.99 g/L. The results showed that increasing the Fe concentration from 0.06 to 0.29 g/L intensified the biogas yield by 360% (from 10.8 to 49.6 mL/g COD). However, further increasing the Fe concentration to 0.99 g/L decreased the biogas yield by 37.8% (from 10.8 to 6.7 mL/g COD). The Fe significantly affected the methane formation stage, but not the acid formation stage. A mechanistic model was built and successfully applied to predict the AD process. Based on the simulation results, Fe concentration of 0.29 g/L resulted in the highest values of YVFA/X2 (yield of volatile fatty acids (VFAs) consumption per biomass of X2 ), μm,2 (specific growth rate for X2 ), fCH4 (composition of methane in biogas) and the lowest values of Ks,VFA (affinity coefficient in VFAs consumption), kd2 (death rate constant for X2 ), kVFA (consumption rate of VFAs for maintenance). The addition of Fe until 0.29 g/L was recommended to increase the quantity and quality (methane content reached 53.4%) of biogas production.

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添加铁对处理酒渣厌氧消化过程的影响:实验与动力学研究

酒糟是生物乙醇工业连续产生的化学需氧量(COD)浓度高、体积大的废弃物。厌氧消化(AD)是处理酒糟的最佳方法，因为它将COD转化为沼气，因此沼气可以满足印度尼西亚的一次能源需求。本研究的目的是研究铁浓度对处理酒糟AD过程的影响。Fe浓度分别为0.06、0.29、0.64、0.99 g/L。结果表明，当Fe浓度从0.06 g/L增加到0.29 g/L时，沼气产量提高了360% (COD从10.8 mL/g提高到49.6 mL/g)。然而，当铁浓度进一步增加到0.99 g/L时，沼气产量下降了37.8%(从10.8 mL/g COD降至6.7 mL/g COD)。铁对甲烷形成阶段的影响显著，而对酸形成阶段的影响不显著。建立了一个机制模型，并成功地应用于AD过程的预测。模拟结果表明，当Fe浓度为0.29 g/L时，每生物量消耗的挥发性脂肪酸(VFAs)产率(YVFA/X2)、特定生长率(μm,2)、甲烷组成(fCH4)值最高，而挥发性脂肪酸消耗亲和系数(VFA)、死亡率常数(kd2)、维持用挥发性脂肪酸消耗速率(kVFA)值最低。建议添加铁至0.29 g/L，可提高沼气产量和质量(甲烷含量达53.4%)。

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

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.