Kinetic modelling of yeast growth and pollutant removal in secondary effluent
Kinetic modelling of yeast growth and pollutant removal in secondary effluent
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DOI：
10.1016/j.jwpe.2022.103244
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发表时间：
2022-12
影响因子：
7
通讯作者：
Obaidullah Mohiuddin;A. Harvey;S. Tabraiz;M. Ameen;Sharon B. Velasquez-Orta
中科院分区：
文献类型：
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作者：
Obaidullah Mohiuddin;A. Harvey;S. Tabraiz;M. Ameen;Sharon B. Velasquez-Orta
近年来，由于其污染物去除率高且能够在非无菌环境中运行，基于酵母的废水处理引起了人们的极大兴趣。在这项工作中，开发了一个动力学模型来预测废水处理过程中酵母的生长和底物消耗。为了确定动力学模型中使用的生物常数，提出了一种独特的方法。在合成废水中培养产朊假丝酵母，使用八种不同比例的碳、氮和磷来确定其生长速率以及碳、氮和磷的去除率。 C、N、P浓度选择在二级出水废水范围内。在所有实验中，发现碳是限制底物，并且在所有情况下都实现了 100% TOC 去除。利用念珠菌在 <24 小时内将 COD 浓度降低了高达 99%。在该模型中，莫诺动力学令人满意地描述了酵母生长和底物消耗。通过模型优化确定的碳、氮和磷的表观半饱和系数是初始底物浓度的函数。发现的最大特定增长率为 0.59 h−1。该模型用于不同初始浓度的底物，预测数据的 R2 高于 80%。模型和实验结果均表明产朊假丝酵母可用于废水的三级处理。这里描述的简单方法可用于查找其他微生物的生物系数。
In recent years, there has been significant interest in yeast-based wastewater treatment due to its high pollutant removal rate and ability to perform in non-sterile environments. In this work, a kinetic model was developed to predict yeast growth and substrate consumption during wastewater treatment. To determine the biological constants for use in the kinetic models, a unique approach is presented.Candida utiliswas cultivated in synthetic wastewater, using eight different ratios of carbon, nitrogen and phosphorus to determine its growth rate, and the removal rates of carbon, nitrogen, and phosphorus. The concentrations of C, N and P were chosen within the range of secondary effluent wastewater. In all experiments, carbon was found to be the limiting substrate, and 100 % TOC removal was achieved in all cases.Candida utilisreduced the COD concentration by up to 99 % in <24 h. In the model, both yeast growth and substrate consumption were satisfactorily described by Monod kinetics. The apparent half-saturation coefficients for carbon, nitrogen, and phosphorus, determined via the optimization of the model, were found to the function of initial substrate concentration. The maximum specific growth rate found was 0.59 h−1. This model was used on different initial concentrations of substrates, and predicted data with an R2above 80 %. Both model and experimental results suggest thatCandida utiliscan be used in the tertiary treatment of wastewater. The simple approach described here can be applied to find biological coefficients for other microorganisms.