International Journal of Advance Agricultural Research
ISSN: 2053-1265
Vol. 7(3), pp. 89-97, April 2019
doi.org/10.33500/ijaar.2019.07.006



Utilization of recovered struvite from mixed wastewater of human urine and municipal sewage

Guoqi Wen1,2, Lijuan Huang1, Xiangru Zhang1 and Zhengyi Hu1,3*

1College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China.
2Department of Soils and Agri-Food Engineering, Université Laval, Quebec, G1V 0A6, Canada.
3Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.

*To whom correspondence should be addressed. E-mail: guoqi.wen.1@ulaval.ca.

Received 21 March, 2019; Received in revised form 09 April, 2019; Accepted 15 April, 2019.

Abstract


Keywords:
Struvite, Phosphorus, Nutrients, Heavy metals, Vegetable.


Struvite (MAP) recovered from a mixed wastewater of human urine and municipal sewage through a novel two-step precipitation method was well developed, but its fertilizer value to crops have not been investigated. The objective of this study was to explore the feasibility of using MAP as a fertilizer in cultivating Chinese cabbage (Brassica rapa L. ssp. pekinensis) by comparing with single superphosphate (SSP). A greenhouse experiment was conducted with the rate of 0.4 g P2O5 per pot and an unfertilized control. The dry mass and concentrations of nitrogen (N), phosphorus (P), and metal elements in vegetable shoots, soil after harvesting vegetables, and soil solutions were studied. Results showed that the average dry masses of vegetable shoots were 1.21, 1.46 and 1.67 g for the control, SSP, and MAP, respectively, which indicated that P fertilization significantly promoted the cabbage growth. The higher yield of Chinese cabbage caused by MAP application was also attributed to the Mg and K addition along with MAP fertilization. The concentrations of heavy metals in shoots, such as Cr and Cd, supplied with MAP were lower than that with SSP, which both were within the Chinese food safety criterion (GB2762-2017). Additionally, MAP supply seemed to increase soil fertility after the cabbage harvesting. The less progressing decrease of the N and P concentrations in soil solution with increasing sampling dates indicated that MAP was a promising slow-releasing fertilizer when compared to SSP. Based on these findings, it was concluded that MAP is an effective, promising, and economic P fertilizer for cultivating cabbage.

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