Conversion of Sweet Whey to Bioethanol: A Bioremediation Alternative for Dairy Industry

Biomass Pub Date : 2024-06-03 DOI:10.3390/biomass4020026

L. Conde-Báez, Cuauhtémoc F. Pineda-Muñoz, C. Conde-Mejía, Elizabeth Mas-Hernández, Antioco López-Molina

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Abstract

In many countries, whey from the dairy industry is an abundant waste that generates an important environmental impact. Alternative processes to use the whey and minimize the environmental impact are needed. This work considered six formulations with different ammonium sulfate and L-phenylalanine (L-Phe) concentrations to produce bioethanol in sweet whey fermentation by Kluyveromyces marxianus. The results showed a maximum bioethanol concentration equal to 25.13 ± 0.37 g L−1 (p < 0.05) for formulation F6, with 1 g L−1 of L-Phe and 1.350 g L−1 of ammonium sulfate (96 h). For these conditions, the chemical oxygen demand removal percentage (CODR%) was 67%. The maximum CODR% obtained was 97.5% for formulation F3 (1 g L−1 of L-Phe) at 96 h; however, a significant decrease in bioethanol concentration (14.33 ± 2.58 g L−1) was observed. On the other hand, for formulation, F3, at 48 h of fermentation time, a bioethanol concentration of 23.71 ± 1.26 g L−1 was observed, with 76.5% CODR%. Based on these results, we suggest that the best conditions to obtain a significant bioethanol concentration and CODR% value are those used on the configuration F3 at 48 h.

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将甜乳清转化为生物乙醇：乳制品行业的生物修复替代方案

在许多国家，乳制品工业产生的乳清是一种大量废物，会对环境造成严重影响。需要采用替代工艺来利用乳清，并最大限度地减少对环境的影响。这项研究考虑了六种不同硫酸铵和 L-苯丙氨酸（L-Phe）浓度的配方，以便在甜乳清发酵过程中通过马克西酵母菌（Kluyveromyces marxianus）生产生物乙醇。结果表明，配方 F6 的最大生物乙醇浓度为 25.13 ± 0.37 g L-1（p < 0.05），L-Phe 浓度为 1 g L-1，硫酸铵浓度为 1.350 g L-1（96 小时）。在这些条件下，化学需氧量去除率（CODR%）为 67%。配方 F3（1 g L-1 L-Phe）在 96 小时内获得的化学需氧量去除率最高为 97.5%，但生物乙醇浓度显著下降（14.33 ± 2.58 g L-1）。另一方面，F3 配方在发酵 48 小时后，生物乙醇浓度为 23.71 ± 1.26 g L-1，CODR%为 76.5%。根据这些结果，我们认为在 48 小时内使用 F3 配方，是获得显著生物乙醇浓度和 CODR% 值的最佳条件。

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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Biomass

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