Thant Zin Moh Moh, Kim Dong-Jin
Department of Environmental Sciences and Biotechnology & Institute of Energy and Environment, Hallym University, 1 Okcheon, Chuncheon, Gangwon, 24252, Republic of Korea.
Department of Environmental Sciences and Biotechnology & Institute of Energy and Environment, Hallym University, 1 Okcheon, Chuncheon, Gangwon, 24252, Republic of Korea.
J Hazard Mater. 2021 Feb 5;403:123704. doi: 10.1016/j.jhazmat.2020.123704. Epub 2020 Aug 19.
The drawback of biochar as a soil ameliorant is its low-nutrient content while the bottleneck of struvite production is its high chemical cost. This drew the idea of using designed biochar for nutrient recovery from nutrient-rich wastewater as struvite. Mg-biochar was used for simultaneous P and N recovery from sewage sludge ash (SSA) and food wastewater (FW) by using ground coffee bean (GCB) and palm tree trunk (PTT) waste. PTT Mg-biochar could recover 92.2% of PO-P and 54.8% of NH-N while GCB Mg-biochar could recover 79.5% of PO-P and 38.6% of NH-N. Adsorption, precipitation and cation-exchange mechanisms are involved in the Mg-biochar for the simultaneous recovery of PO-P and NH-N as struvite. Mg-biochars also showed higher struvite selectivity than the control samples. This method not only supports waste recycling and pollution mitigation but also highlights economical struvite production and the benefits of CO sequestration.
生物炭作为土壤改良剂的缺点是其养分含量低，而鸟粪石生产的瓶颈在于其化学成本高。这催生了利用设计的生物炭从富营养废水中回收养分作为鸟粪石的想法。通过使用磨碎的咖啡豆（GCB）和棕榈树干（PTT）废料，镁生物炭用于从污水污泥灰（SSA）和食品废水（FW）中同时回收磷和氮。PTT镁生物炭可回收92.2%的磷酸根磷和54.8%的铵态氮，而GCB镁生物炭可回收79.5%的磷酸根磷和38.6%的铵态氮。镁生物炭通过吸附、沉淀和阳离子交换机制同时回收磷酸根磷和铵态氮作为鸟粪石。镁生物炭对鸟粪石的选择性也高于对照样品。该方法不仅支持废物回收和污染减轻，还突出了鸟粪石的经济生产以及碳封存的益处。
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