Slow Release Fertilizer Materials Based on Magnesium Ammonium Phosphate. Pilot-Plant Granulation Studies

Peng, Peter Ho; Ernst, William R.; Bridger, G. L.; Hartley, Edwin M.

doi:10.1021/i260071a018

Cited by 9 publications

(4 citation statements)

References 2 publications

(3 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in Table 2, the SIs of struvite fertilizers with different formulations were all significantly lower than that of NPK fertilizer. Thus, as mentioned by pervious authors [17,18], the application of struvite on soil does not negatively affect the seeds and roots of crops and it does not lead to accumulation of salt in soils, even if applied in large quantities.…”

Section: Ph and Salt Indexmentioning

confidence: 82%

“…The average NPK crush strength was similar to the values obtained by Walker et al [19], which was around 3-8.5 kgf with a size of 2.9-4.5 mm. In a study by Peng et al [18], a pilot plant granulator was studied for the granulation of magnesium ammonium phosphate. The crush strength of magnesium ammonium phosphate-based fertilizers was between 2.7 and 3.2 kgf after 96 hours of curing with the mesh size of 3.36-4.76 mm.…”

Section: Hardnessmentioning

confidence: 99%

See 1 more Smart Citation

Struvite-based fertilizer and its physical and chemical properties

Latifian

Liu²,

Mattiasson³

2012

Environmental Technology

View full text Add to dashboard Cite

This study describes a method to formulate struvite fine powder into pellets that are easy to spread on agricultural land. To evaluate the quality of produced pellets, some chemical and physical properties commonly measured for fertilizers were tested. The findings indicated that the salt index and heavy metal content ofstruvite pellets were significantly lower than those of commercial NPK fertilizers. In addition, the percentage of nutrient released from struvite pellets after 105 days was in the range of 9.6-23.2, 8.4-26.7 and 11.3-32.6% for nitrogen, phosphorous and magnesium, respectively, which is considerably lower than that of commercial NPK fertilizer. Among different formulations between struvite crystals and binders, starch and bentonite were the most efficient in agglomerating struvite powder, leading to an increase in the crush strength to over the recommended limit of >2.5 kgf for fertilizer hardness.

show abstract

Section: Ph and Salt Indexmentioning

confidence: 82%

Section: Hardnessmentioning

confidence: 99%

Struvite-based fertilizer and its physical and chemical properties

Latifian

Liu²,

Mattiasson³

2012

Environmental Technology

View full text Add to dashboard Cite

show abstract

“…For a newly developed, alternative fertilizer material to find a market niche, the material must be economically viable as well, not just agronomically effective. Although struvite has been recognized as a viable fertilizer product since the late 1950s, initial commercial production was limited due to large manufacturing costs [26]. Issues related to transportation, storage, composition, and purity also hindered commercial-scale development.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Struvite as an Alternative Sources of Fertilizer-Phosphorus for Flood-Irrigated Rice

et al. 2022

View full text Add to dashboard Cite

Phosphorus (P) recovery from wastewaters as struvite (MgNH4PO4·6H2O) may be a viable alternative fertilizer-P source for agriculture. The objective of this study was to evaluate the economic and environmental implications of struvite as a fertilizer-P source for flood-irrigated rice (Oryza sativa) relative to other commonly used commercially available fertilizer-P sources. A field study was conducted in 2019 and 2020 to evaluate the effects of wastewater-recovered struvite (chemically precipitated struvite (CPST) and electrochemically precipitated struvite (ECST)) on rice yield response in a P-deficient, silt–loam soil in eastern Arkansas relative to triple superphosphate, monoammonium and diammonium phosphate, and rock phosphate. A life cycle assessment methodology was used to estimate the global warming potentials associated with rice produced with the various fertilizer-P sources. Life cycle inventory data were based on the field trials conducted with and without struvite application for both years. A partial budget analysis showed that, across both years, net revenues for ECST and CPST were 1.4 to 26.8% lower than those associated with the other fertilizer-P sources. The estimated greenhouse gas emissions varied between 0.58 and 0.70 kg CO2 eq kg rice−1 from CPST and between 0.56 and 0.81 kg CO2 eq kg rice−1 from ECST in 2019 and 2020, respectively, which were numerically similar to those for the other fertilizer-P sources in 2019 and 2020. The similar rice responses compared to commercially available fertilizer-P sources suggest that wastewater-recovered struvite materials might be an alternative fertilizer-P-source option for flood-irrigated rice production if struvite can become price-competitive to other fertilizer-P sources.

show abstract

“…one containing potassium and phosphate in a form which can be assimilated over longer periods (Araten, 1970; U.S. Pat., 1979;Nielsson, 1987;Peng et al, 1979;Phosphorus Potassium, 1972; Volfkovic and Cerepanova, 1973; Zawartka, 1984). Potassium polyphosphate, the so-called Kurrol's salt, is an example of that kind of fertilizer.…”

Section: Introductionmentioning

confidence: 99%