Struvite recovery from human urine in inverse fluidized bed reactor and evaluation of its fertilizing potential on the growth of Arachis hypogaea

Sathiasivan, Kiruthika; Ramaswamy, Jeyalakshmi; Rajesh, Mathur

doi:10.1016/j.jece.2020.104965

Cited by 23 publications

(8 citation statements)

References 53 publications

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“…The cost of the MISP technology mainly consists of the costs of the culture medium and MgCl 2 . Ammonium and phosphorus can be obtained from polluted water bodies, municipal sludge ash, and aquaculture wastewater (Sathiasivan et al, 2021;Thant Zin and Kim, 2021). Bacteria could be grown in the prepared medium, and a small number of strains were cultured for 48 h. Therefore, the MISP technology further reduced the cost of industrial mud treatment.…”

Section: Costsmentioning

confidence: 99%

Treatment of engineering waste slurries by microbially induced struvite precipitation mechanisms

Liu²,

Shen³

et al. 2023

Front. Bioeng. Biotechnol.

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With societal development, the growing scale of engineering construction, and the increase in environmental protection requirements, the necessity of engineering waste mud disposal is becoming increasingly prominent. In this study, microbially induced struvite precipitation (MISP) was introduced to treat engineering waste mud. The study mainly focused on: i) the optimal mineralization scheme for microbially induced struvite precipitation, ii) the feasibility of the process and the effect of reaction parameters on treating engineering waste mud with microbially induced struvite precipitation, and iii) the mechanism of microbially induced struvite precipitation in treating engineering waste mud. The results showed that the waste mud could be well treated with 8.36×106 cell⋅mL−1 bacteria, 10 mM urea, 20 mM phosphate buffer, and 25 mM MgCl2 at pH 7. The kaolin suspension could be effectively flocculated. The flocculation rate reached approximately 87.2% under the optimum mineralization conditions. The flocculation effect was mainly affected by the concentrations of reactants and heavy metals and the suspension pH. The X-ray diffraction (XRD) patterns showed a strong struvite (MAP) diffraction peak. Scanning electron microscopy (SEM) images indicated that under the optimal mineralization conditions, the crystals were large and showed prismatic shapes tilted at both ends with adhered kaolin particles. In summary, this manuscript provides an effective way to treat engineering waste mud, and the findings should have a positive effect on enhancing soil fertility and preventing secondary pollution.

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Section: Costsmentioning

confidence: 99%

Treatment of engineering waste slurries by microbially induced struvite precipitation mechanisms

Liu²,

Shen³

et al. 2023

Front. Bioeng. Biotechnol.

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“…Struvite, a crystalline mineral having formula MgNH 4 PO 4 .6H 2 O, has equimolar concentration of phosphate, ammonium, and magnesium ions [58,59] and thus can prove as an alternate source of phosphorus. Struvite can be crystallized from the wastewaters of agriculture, sewage effluents, industrial streams, animal waste, and urine [58].…”

Section: Precipitation Of Struvite Mineralmentioning

confidence: 99%

“…Around 85% of the mined phosphorus finds way in the water bodies through soil erosion, agriculture, and livestock waste, which promotes eutrophication; therefore, struvite precipitation can be useful to reduce this pollution [61]. Two major conditions for struvite crystallization are pH between 8.5 and 9.5 with maximum at 9.5, which reduces further, and the concentration of three ions in equimolar concentration and above struvite solubility limit (>0.2 gl −1 ) [58][59][60][61][62]. P content of the struvite remains in the range of 11-26% depending on the source, of which 1-2% is watersoluble and slow release in nature [60].…”

Section: Precipitation Of Struvite Mineralmentioning

confidence: 99%

Alternatives to Soluble Phosphorus Fertilizers in Indian Context

Jayara¹,

Kumar²,

Pandey³

et al. 2023

Functional Phosphate Materials and Their Applications

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Phosphorus is one of the primary nutrients required in crop production. Rock phosphate is the raw material required for the manufacturing of soluble phosphorus fertilizers, which is nonrenewable in nature and expected to last for 50–400 years. The restriction of resources to few geographical locations makes its supply more vulnerable. In India, 90% of the rock phosphate for fertilizer manufacturing is imported. However, the low quality of rock phosphate deposits available in India can be utilized with certain modifications in the form of addition of phosphate-solubilizing bacteria, addition of gypsum, and in the form of phospho-enriched compost. Agriculture, livestock, urban and industrial waste can also prove to be a source of phosphorus through crystallization of struvite. There are encouraging results of struvite compared with soluble phosphorus fertilizers. This will reduce the import dependency in India as well as encourage the Atmanirbhar initiative in phosphorus fertilizer.

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“…Under these conditions 90% of phosphorus was recovered. Sathiasivan et al (2021) were able to recover struvite from synthetic urine using a DFFBR with a downflow of 51.12 m h À1 with low density (836 kg m À3 ) polyethylene particles (5 mm). To promote the formation of struvite the pH was raised to 9.5 with NaOH.…”

Section: Yellow Water Treatmentmentioning

confidence: 99%

Start-up and performance of a downflow fluidised bed reactor for biological treatment of yellow wastewater and nutrient recovery

Espinosa-Chávez

Ramírez-Vives

Zeeman³

et al. 2022

Water Science and Technology

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The treatment of yellow water (human urine) in a downflow fluidised bed reactor (DFFBR) was investigated to evaluate biological ureolysis and nutrient recovery. The reactor was operated at 30±4 °C in batch mode, and hydraulic retention time=1 d. The average immobilised biomass (as volatile solids, IVS) in the reactor was 2.5±0.9 g L−1support, and specific ureolytic activity was 121 g Urea-N g−1 IVS d−1. The kinetic parameters were 0.152 mol L−1 (Km) and 8 mol g−1 IVS d−1 (Vmax). The ureolysis efficiency was 93.4% and chemical oxygen demand removal efficiency was 31.2%, while total ammonium nitrogen (NH4+-N) production rate was 7 g L−1 d−1 and phosphate removal reached 26%. Precipitates recovery during biological treatment was 1.72±0.8 g. These results suggest that the treatment of yellow water in a DFFBR is a viable option for partial recovery of N and P.

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Struvite recovery from human urine in inverse fluidized bed reactor and evaluation of its fertilizing potential on the growth of Arachis hypogaea

Cited by 23 publications

References 53 publications

Treatment of engineering waste slurries by microbially induced struvite precipitation mechanisms

Treatment of engineering waste slurries by microbially induced struvite precipitation mechanisms

Alternatives to Soluble Phosphorus Fertilizers in Indian Context

Start-up and performance of a downflow fluidised bed reactor for biological treatment of yellow wastewater and nutrient recovery

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