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Characterization of value-added chemicals derived from the thermal hydrolysis and wet oxidation of sewage sludge
Frontiers of Environmental Science & Engineering ( IF 6.4 ) Pub Date : 2020-08-13 , DOI: 10.1007/s11783-020-1305-2
Milan Malhotra , Anurag Garg

We evaluated the effect of hydrothermal pretreatments, i.e., thermal hydrolysis (TH) and wet oxidation (WO) on sewage sludge to promote resource recovery. The hydrothermal processes were performed under mild temperature conditions (140°C–180°C) in a high pressure reactor. The reaction in acidic environment (pH = 3.3) suppressed the formation of the color imparting undesirable Maillard’s compounds. The oxidative conditions resulted in higher volatile suspended solids (VSS) reduction (∼90%) and chemical oxygen demand (COD) removal (∼55%) whereas TH caused VSS and COD removals of ∼65% and ∼27%, respectively at a temperature of 180°C. During TH, the concentrations of carbohydrates and proteins in treated sludge were 400–1000 mg/L and 1500–2500 mg/L, respectively. Whereas, WO resulted in solids solubilization followed by oxidative degradation of organics into smaller molecular weight carboxylic acids such as acetic acid (∼400–500 mg/L). Based on sludge transformation products generated during the hydrothermal pretreatments, simplified reaction pathways are predicted. Finally, the application of macromolecules (such as proteins), VFAs and nutrients present in the treated sludge are also discussed. The future study should focus on the development of economic recovery methods for various value-added compounds.



中文翻译:

污水污泥热水解和湿氧化衍生的增值化学品的特性

我们评估了水热预处理(即热水解(TH)和湿式氧化(WO))对污水污泥以促进资源回收的影响。在高温反应器中,在温和的温度条件下(140°C–180°C)进行了水热过程。在酸性环境(pH = 3.3)中的反应抑制了形成不希望的美拉德化合物的颜色。氧化条件导致较高的挥发性悬浮固体(VSS)减少(〜90%)和化学需氧量(COD)去除(〜55%),而TH分别在650℃和5%时去除VSS和COD约27%。温度为180°C。在TH期间,处理过的污泥中的碳水化合物和蛋白质的浓度分别为400–1000 mg / L和1500–2500 mg / L。鉴于,WO导致固体溶解,然后将有机物氧化降解为较小分子量的羧酸,例如乙酸(约400-500 mg / L)。基于水热预处理过程中产生的污泥转化产物,可以预测简化的反应路径。最后,还讨论了存在于处理后的污泥中的大分子(例如蛋白质),VFA和养分的应用。未来的研究应侧重于开发各种增值化合物的经济复苏方法。还讨论了处理后的污泥中存在的VFA和养分。未来的研究应侧重于开发各种增值化合物的经济复苏方法。还讨论了处理后的污泥中存在的VFA和养分。未来的研究应侧重于开发各种增值化合物的经济复苏方法。

更新日期:2020-08-20
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