Abstract
Agrotechnical assessment of struvite produced by a lab-scale sedimentation unit is performed. As a source of phosphates and ammonia, liquor obtained through dewatering of Мunicipal wastewater treatment plant sludge was in use. The range of phosphates and ammonia was in the range of 130 - 250 and 380 - 560 mg/L, respectively. Seawater brine with a magnesium concentration of around 60 g Mg2+/L was applied as a source of magnesium. The agrotechnical characteristics of struvite obtained were compared to ammonium nitrate and carbamide in regards to the productivity effects on maize hybrid P9241. The results show that the effectiveness of struvite and some commercial fertilizers is quite close. The highest yield in the experiment was achieved with the application of carbamide plus ammonium nitrate (56.64 kg/ha), while in applying struvite solely it is 54.60 kg/ha. The highest protein content of maize (9.7%) was observed in the case of struvite/ammonium nitrate application.
Highlights
The reduction of the consumption of the natural resources on the Earth to the minimum has been one of the biggest challenges before scientists all over the world during the past few years
The results show that the effectiveness of struvite and some commercial fertilizers is quite close
Wastewaters, sludge, and manures produced from wastewater treatment plants and livestock farms contain a high concentration of phosphates and ammonia
Summary
The reduction of the consumption of the natural resources on the Earth to the minimum has been one of the biggest challenges before scientists all over the world during the past few years. Phosphorus (P) is an essential element for all forms of life. It is necessary for metabolic processes (ADP/ATP) and is an integral part of the DNA molecule as well as the cell membrane. For those reasons, P in the form of phosphate is applied as an agricultural fertilizer to maximize plant growth. Organic (e.g., manure, compost, biogas, and others) and inorganic phosphate rock-based fertilizers are employed in agriculture. Due to the finite availability of phosphate rock resources and unstable phosphate
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