Nutrient recovery from manure digestate by using waste magnesite powder and bone meal as sustainable substitutes for struvite precipitation

IF 2.8 4区生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Journal of chemical technology and biotechnology Pub Date : 2024-05-01 DOI:10.1002/jctb.7661

Feride Ece Kutlar, Iskin Engin, Yasemin Dilsad Yilmazel

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引用次数: 0

Abstract

BACKGROUND

Struvite (MgNH₄PO₄.6H₂O) precipitation is a sustainable approach that can offer simultaneous removal/recovery of nutrients from biogas plant effluents. However, most biogas plant effluents contain a higher molar concentration of nitrogen (N) than magnesium (Mg) and phosphorus (P). Therefore, the external addition of Mg²⁺ and phosphate (PO₄^3-) salts is needed to maximize the recovery. In this study, Mg-rich waste magnesite powder and P-rich bone meal were used as sustainable additives. The Box–Behnken design was applied to determine optimum conditions of process parameters (pH, Mg:N and P:N molar ratios) to maximize ammonium-nitrogen (NH₄-N), PO₄-P and Mg²⁺recoveries.

RESULTS

NH₄-N, PO₄-P and Mg²⁺ recoveries were in the ranges 78.5%–96.9%, 69.2%–96.3% and 75.1%–99.9%, respectively. The actual and predicted values showed significant consistency, indicating that the model is satisfactory. Under optimum conditions (pH = 9.0, Mg:N = 2.2, P:N = 1.8), 97.8 ± 0.1% NH₄-N, 96.6 ± 0.31% PO₄-P and 84.4 ± 0.9% Mg²⁺ recovery were attained. The X-ray diffraction results confirmed the sole presence of struvite crystals. Scanning electron microscopy images showed irregular prismatic orthorhombic crystals and amorphous material depositions on precipitates of ~25 μm crystal size. The product was 49% struvite with 15.2% P content. The heavy metal content was lower than regulatory limits.

CONCLUSION

Even though waste material and industrial by-products have been used as additives in this process, high NH₄-N and PO₄-P recoveries were recorded under optimum conditions. These results are promising and illustrate a powerful example of industrial symbiosis, and the precipitate containing struvite can serve as a valuable product. © 2024 The Authors. Journal of Chemical Technology and Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry (SCI).

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利用废弃菱镁矿粉和骨粉作为沉淀硬石膏的可持续替代品，从粪便沼渣中回收养分

背景锡石（MgNH4PO4.6H2O）沉淀法是一种可持续的方法，可同时去除/回收沼气厂污水中的营养物质。然而，大多数沼气厂污水中的氮摩尔浓度高于镁和磷。因此，需要在外部添加镁盐和磷酸盐，以最大限度地提高回收率。在这项研究中，废菱镁矿粉和骨粉中的磷被用作可持续添加剂。结果NH4-N、PO4-P 和 Mg2+ 的回收率分别为 78.5% - 96.9%、69.2% - 96.3% 和 75.1% - 99.9%。实际值和预测值显示出明显的一致性，表明该模型是令人满意的。在最佳条件下（pH = 9.0，Mg:N = 2.2，P:N = 1.8），NH4-N 的回收率为 97.8 ± 0.1%，PO4-P 的回收率为 96.6 ± 0.31%，Mg2+ 的回收率为 84.4 ± 0.9%。X 射线衍射结果证实仅存在铁矾石晶体。扫描电子显微镜图像显示，沉淀物上有不规则棱柱形正方体晶体和无定形物质沉积，晶体大小约为 25 μm。产品中的闪石含量为 49%，P 含量为 15.2%。结论尽管在该工艺中使用了废料和工业副产品作为添加剂，但在最佳条件下，NH4-N 和 PO4-P 的回收率很高。这些结果很有前景，是工业共生的有力例证，含有硬石膏的沉淀物可作为有价值的产品。本文受版权保护，版权所有。

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来源期刊

Journal of chemical technology and biotechnology 工程技术-工程：化工

CiteScore

7.00

自引率

5.90%

发文量

268

审稿时长

1.7 months

期刊介绍： Journal of Chemical Technology and Biotechnology(JCTB) is an international, inter-disciplinary peer-reviewed journal concerned with the application of scientific discoveries and advancements in chemical and biological technology that aim towards economically and environmentally sustainable industrial processes.