Universidad Autónoma del Estado de México (UAEM, CIRA), col. Centro, C.P. 50000, Toluca, Mexico.
Universidad Autónoma del Estado de México (UAEM, CIRA), col. Centro, C.P. 50000, Toluca, Mexico.
J Environ Manage. 2018 Jan 15;206:103-112. doi: 10.1016/j.jenvman.2017.10.023. Epub 2017 Oct 20.
Applying ozone to the return flow in an activated sludge (AS) process is a way for reducing the residual solids production. To be able to extend the activated sludge models to the ozone-AS process, adequate prediction of the tri-atoms effects on the particulate COD fractions is needed. In this study, the biomass inactivation, COD mineralization, and solids dissolution were quantified in batch tests and dose-response models were developed as a function of the reacted ozone doses (ROD). Three kinds of model-sludge were used. S1 was a lab-cultivated synthetic sludge with two components (heterotrophs X and X). S2 was a digestate of S1 almost made by the endogenous residues, X. S3 was from a municipal activated sludge plant. The specific ozone uptake rate (SOUR, mgO/gCOD.h) was determined as a tool for characterizing the reactivity of the sludges. SOUR increased with the X fraction and decreased with more X. Biomass inactivation was exponential (e) as a function of the ROD doses. The percentage of solids reduction was predictable through a linear model (C + Y ROD), with a fixed part due to mineralization (C) and a variable part from the solubilization process. The parameters of the models, i.e. the inactivation and the dissolution yields (β, 0.008-0.029 (mgO/mgCOD) vs Y, 0.5-2.8 mg COD/mgO) varied in magnitude, depending on the intensity of the scavenging reactions and potentially the compactness of the flocs for each sludge.
向活性污泥（AS）工艺的回流中施加臭氧是减少剩余固体产量的一种方法。为了能够将活性污泥模型扩展到臭氧-AS 工艺，需要对臭氧三原子对颗粒 COD 分数的影响进行充分预测。在这项研究中，通过批处理试验量化了生物量失活、COD 矿化和固体溶解，并开发了剂量-响应模型，作为反应臭氧剂量（ROD）的函数。使用了三种模型污泥。S1 是一种由两种成分（异养菌 X 和 X）组成的实验室培养合成污泥。S2 是 S1 的消化物，几乎由内源性残留物 X 组成。S3 来自城市活性污泥厂。比臭氧需氧量（SOUR，mgO/gCOD.h）被确定为表征污泥反应性的工具。SOUR 随 X 分数的增加而增加，随更多 X 的增加而减少。生物量失活与 ROD 剂量呈指数（e）关系。通过线性模型（C + Y ROD）可预测固体减少的百分比，其中固定部分是由于矿化（C），可变部分是由于溶解过程。模型的参数，即失活和溶解产率（β，0.008-0.029（mgO/mgCOD）与 Y，0.5-2.8 mg COD/mgO），取决于每种污泥的猝灭反应强度和潜在的絮体紧密度。
