The Utilization of Phosphogypsum as a Sustainable Phosphate-Based Fertilizer by Aspergillus niger
The Utilization of Phosphogypsum as a Sustainable Phosphate-Based Fertilizer by Aspergillus niger
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DOI：
10.3390/agronomy12030646
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发表时间：
2022-03-01
期刊：
影响因子：
3.7
通讯作者：
Gao, Hongjian
中科院分区：
文献类型：
--
作者：
Tian, Da;Xia, Jingjing;Gao, Hongjian
磷石膏(PG)是磷(P)化学工业的副产品，通常含有接近2%的残余磷酸盐。PG中的P会通过长期堆积的方式造成环境中的P污染。解磷真菌(PSF)能有效地促进不溶性磷的释放。通过摇瓶实验，研究了黑曲霉(Ang)在磷酸三钙(TCP)和PG之间的释磷能力。同时，还进行了PG肥(PGF)在土壤中的应用。培养5d后，两种处理之间的Ang干生物量分别达到最大值0.71g和0.38g。从PG和TCP中释放的磷的最大浓度分别为5d和7d，即分别为128m g/L和1103m g/g。PG的释磷率与Ang的TCP相似，分别为52%和55%。在土壤培养试验中，PGF能显著提高土壤速效P含量，并在培养4周后继续维持较高浓度(17.2 mg/kg)。Ang通过PGF利用PG是提高土壤P含量，特别是磷酸盐资源可持续利用的一条可行途径。
Phosphogypsum (PG) is a by-product of the phosphorus (P) chemical industry, and usually contains similar to 2% residual phosphate. The P in PG would cause P pollution in the environment by the way of long-term stacking. Phosphate-solubilizing fungi (PSF) can effectively promote the release of P from insoluble phosphate. The aim of this study was to investigate the P release capacity between tricalcium phosphate (TCP) and PG by Aspergillus niger (ANG) via flask experiment. At the same time, the application of PG fertilizer (PGF) in soil was also performed. The dry biomass of ANG between TCP and PG treatment reached the maximum value of 0.71 and 0.38 g, respectively, after five days of incubation. The maximum P concentrations released from PG and TCP by ANG is five and seven days, i.e., 128 and 1103 mg/L, respectively. PG has a similar P release ratio compared with TCP by ANG, i.e., 52% vs. 55%. In the soil incubation experiment, PGF can significantly increase the soil available P content and continuously maintain the high concentration (17.2 mg/kg) after four weeks of incubation. The utilization of PG by ANG via the PGF is a feasible pathway to increase the soil P content, especially for the sustainable use of phosphate resources.