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研究生物炭中的现有形式和回收效率,从过剩的污泥中回收

Changzi Guo¹, Wanqin Zhao², Yi Han²

¹School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China

Water science and technology : a journal of the International Association on Water Pollution Research

|February 29, 2024

概括

过剩的污泥 (ES) 的热解将其转化为生物炭,显著增加 (P) 含量. 在最佳条件下,可实现100%的生物炭水效率,有助于资源回收.

科学领域:

环境科学环境科学
材料科学材料科学材料科学
化学工程是化学工程的重要组成部分.

背景情况:

越来越多地强调碳中和,推动了从过剩的污泥 (ES) 中回收资源和能源的研究.
热解ES提供了一条生产生物炭和回收 (P) 的途径.

研究的目的:

研究来自过剩污泥 (BCES) 的生物炭中 (P) 的形式.
为了确定从BCES中P的回收效率.
为了优化从BCES中出P的条件.

主要方法:

过剩的污泥 (ES) 在不同温度 (650-850°C) 下进行了热解.
从过剩的污泥 (BCES) 进行生物炭的表征,以确定 (P) 形式和矿物阶段.
优化浸出参数,包括时间,硫酸度,速率和液体/固体比率.

主要成果:

在850°C下化过剩污泥 (BCES) 的生物炭含有65.1 mg/g的总 (TP),是ES的两倍.
(P) 主要以酸 (AlPO4) 的形式存在于BCES在650-850°C.
在优化条件下 (150分钟,0.2mol/L H2SO4,220rpm,50mL/g) 实现了100%的 (P) 浸出效率.

结论:

热解有效地将 (P) 集中在来自过剩污泥 (BCES) 的生物炭中.
优化的酸可以从BCES中完全恢复 (P).
热解温度会影响矿物成分和金属漏,但不会影响漏效率.

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