Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, AB, T2N 1N4, Canada.
Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB, T6G 1H9, Canada.
Sci Rep. 2022 Feb 21;12(1):2901. doi: 10.1038/s41598-022-06930-0.
To solve the problems of eutrophication and resource crisis, the recovery of phosphorus by struvite (NHMgPO·6HO) precipitation has become a focus of recent research. The feasibility of using Kraft lignin powder as a seed to promote struvite precipitation has been demonstrated in the previous study. In this study, the effect of lignin in promoting struvite precipitation in synthetic wastewater with different characteristics was investigated. Lignin-induced struvite crystallization was tested under various initial concentrations of PO-P and NH-N, total suspended solids (TSS) and alkalinity. At pH 7.9, the enhancement of PO-P recovery remains around 45% under different PO-P and NH-N concentrations. Moreover, lignin is more effective under relatively lower alkalinity and still workable to reduce co-precipitates potential under higher alkalinity. Also, the effect of TSS on PO-P recovery is not significant. Overall, the effect of lignin in promoting phosphorus recovery is relatively stable and can be used in synthetic wastewater with different characteristics.
为了解决富营养化和资源危机问题，通过鸟粪石（NH4MgPO4·6H2O）沉淀回收磷已成为当前研究的重点。在之前的研究中，已经证明了 Kraft 木质素粉末作为促进鸟粪石沉淀的晶种的可行性。在本研究中，考察了木质素在不同特性的合成废水中促进鸟粪石沉淀的效果。在不同的 PO4-P 和 NH4-N、总悬浮固体（TSS）和碱度初始浓度下，对木质素诱导的鸟粪石结晶进行了测试。在 pH 7.9 下，不同 PO4-P 和 NH4-N 浓度下，PO4-P 回收率的提高仍保持在 45%左右。此外，木质素在较低的碱度下效果更好，在较高的碱度下仍能降低共沉淀的潜力。TSS 对 PO4-P 回收率的影响也不显著。总体而言，木质素促进磷回收的效果相对稳定，可用于具有不同特性的合成废水中。
