Journal of the Taiwan Institute of Chemical Engineers ( IF 5.5 ) Pub Date : 2022-01-12 , DOI: 10.1016/j.jtice.2022.104203 Mohamad Ebrahim Malool 1 , Mostafa KeshavarzMoraveji 1 , Jalal Shayegan 2
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Background
Integrated sewage sludge handling and heavy metal management are important issues that scientists are working to solve today.
Methods
Hydrothermal carbonization of dewatered digested sewage sludge (DDSS) under various conditions is carried out in this work, followed by alkali activation. The response surface methodology is used to investigate the operating process conditions and optimize them in order to produce hydrochar with the highest modified adsorption capacity (yield and Pb2+ adsorption).
Significant Findings
The ideal conditions are 182.4°C, 4.9 hours, 5.025 (w/w) water/DDSS ratio, and 3.5 (w/w) ZnCl2/DDSS ratio. In addition, the Langmuir isotherm (qmax =109.3 mg/g) and pseudo-second-order models (qeq=110.7 mg/g) fit the experimental results better. The thermodynamics research confirmed that the adsorption process is spontaneous and endothermic. The findings revealed that hydrothermal carbonization of DDSS may be used to make effective adsorbents for heavy metal removal and waste management.
中文翻译：
消化污泥的水热碳化与碱活化相结合：污泥处理、优化生产、表征和 Pb(II) 吸附的综合方法
背景
综合污水污泥处理和重金属管理是当今科学家们正在努力解决的重要问题。
方法
本工作对脱水消化污泥（DDSS）在各种条件下进行水热碳化，然后进行碱活化。响应面法用于研究操作工艺条件并对其进行优化，以生产具有最高改性吸附容量（产率和 Pb 2+吸附）的水炭。
重要发现
理想条件是 182.4°C、4.9 小时、5.025 (w/w) 水/DDSS 比和 3.5 (w/w) ZnCl 2 /DDSS 比。此外，Langmuir 等温线（q max =109.3 mg/g）和准二阶模型（q eq =110.7 mg/g）更符合实验结果。热力学研究证实吸附过程是自发吸热的。研究结果表明，DDSS 的水热碳化可用于制造用于重金属去除和废物管理的有效吸附剂。
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