Circular economy approach: Nutrient recovery and economical struvite production from wastewater sources by using modified biochars

被引：2

作者：

Zin M.M.T. ^{[1
]}

Hussain M. ^{[2
]}

Kim D.-J. ^{[3
]}

Yang J.E. ^{[4
]}

Choi Y.J. ^{[1
]}

Park Y.-K. ^{[1
]}

机构：

[1] School of Environmental Engineering, University of Seoul, Seoul

[2] Department of Chemical Engineering, COMSATS University Islamabad, Lahore Campus, Defence Road, Off Raiwind Road, Lahore

[3] Department of Environmental Science and Biotechnology, Hallym University

[4] Technology Innovation Research Division, World Institute of Kimchi, Gwangju

来源：

Chemosphere | 2024年 / 362卷

基金：

新加坡国家研究基金会;

关键词：

Biochar; Bittern; Food wastewater; Nutrient recovery; Sludge; Struvite;

D O I：

10.1016/j.chemosphere.2024.142589

中图分类号：

学科分类号：

摘要：

The enrichment of phosphorus (P) and nitrogen (N) in aquatic systems can cause eutrophication. Moreover, P rocks may become exhausted in the next 100 years. A slow-release fertilizer called struvite (MgNH4PO4.6H2O) can reduce surface runoff. However, the high cost of raw material or chemicals is a bottleneck in their economical production. Therefore, incinerated sewage sludge ash, food wastewater, and bittern were combined as the sources of P, N, and Mg, respectively. Sawdust biochar was used to enhance the adsorptive recovery of nutrients. First, recovery kinetics was studied by comparing bittern-impregnated biochar (BtB) with the Mg-impregnated biochar (MgB). Subsequently, the synergistic physical and chemical interactions were observed for P and N recovery. Almost complete PO43–P recoveries were achieved within 10 min for both biochars. However, NH4+-N recovery was stable after 2 h, with 26% recovery by MgB and 20% recovery by BtB. Biochars activated with steam (steam-activated biochar) and KOH (KOH-activated biochar) gave superior activities to those of unactivated biochars and activated carbon (AC) nutrient recovery and struvite purity. Moreover, the activated biochars showed a lower risk of surface runoff, similar to that of AC. Therefore, activated biochars can be used as an alternative to AC for economical struvite production from a combination of wastewater sources. © 2024 Elsevier Ltd

引用

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