Phosphate recovery from swine wastewater by struvite precipitation and process optimization using response surface methodology

Lavanya, Addagada; Ramesh, Sivalingam; Nandhini, S.

doi:10.5004/dwt.2019.24447

Cited by 16 publications

(7 citation statements)

References 49 publications

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“…Considering the XRD result and struvite purity, struvite (approximately 95%) was major and Mg 3 (PO 4 ) 2 (approximately 5%) was minor in product. Compared with the products in previous research [42][43][44], phosphorus recovery (95.06%) and struvite purity (94.94%) were considerable. Commercial enriched struvite purity is mostly over 98% and, unfortunately, the product of this research was not pure enough to be a laboratory reagent (LR).…”

Section: Effect Of Struvite Precipitationcontrasting

confidence: 65%

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Enhancing Phosphorus Recovery and Dewaterability of Waste Activated Sludge for Combined Effect of Thermally Activated Peroxydisulfate and Struvite Precipitation

Liao

Chen

et al. 2021

Sustainability

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Phosphorus is a nonrenewable and irreplaceable limited resource, and over 90% of phosphorus in influenttransfers into sludge in wastewater treatment plants. In this study, thermally activated peroxydisulfate (TAP) treatment was combined with struvite precipitation to enhance waste activated sludge (WAS) dewaterability and phosphorus recovery. TAP simultaneously enhanced dewaterability and solubilization of WAS. The optimal conditions of TAP treatment were PDS dosage 2.0 mmol/g TSS, 80 °C, pH 4.0~7.0 and 40 min, which enhanced dewaterability (capillary suction time (CST) from 94.2 s to 28.5 s) and solubilization (PO43−-P 177.71 mg/L, NH4+-N 287.22 mg/L and SCOD 10754 mg/L). Radical oxidation disintegrated tightly bound extracellular polymeric substances (TB-EPS) and further released bound water. The acidification effect neutralized the negative surface charge of colloid particles. Compared with thermal hydrolysis, TAP effectively promoted the release of PO43−, NH4+ and SCOD. Cation exchange removed most Ca and Al of the TAP treated supernatant. The optimal conditions of struvite precipitation were Mg/P 1.4 and pH 10.0, which achieved phosphorus recovery of 95.06% and struvite purity of 94.94%. The income obtained by struvite adequately covers the cost of struvite precipitation and the cost of WAS treatment is acceptable.

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Section: Effect Of Struvite Precipitationcontrasting

confidence: 65%

“…in previous research [42][43][44], phosphorus recovery (95.06%) and struvite purity (94.94%) were considerable. Commercial enriched struvite purity is mostly over 98% and, unfortunately, the product of this research was not pure enough to be a laboratory reagent (LR).…”

Section: Effect Of Struvite Precipitationmentioning

confidence: 72%

Enhancing Phosphorus Recovery and Dewaterability of Waste Activated Sludge for Combined Effect of Thermally Activated Peroxydisulfate and Struvite Precipitation

Liao

Chen

et al. 2021

Sustainability

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“…CO 3 2− :P molar ratio 1. P recovery efficiency (%) [ 155 ] Struvite recovery using fluidized bed reactor CCD 18 1. pH 2. Circulation rate (L L reactor −1 h −1 ) 3.…”

Section: Application Of Rsm In Various Livestock Wastewater Treatment...mentioning

confidence: 99%

Response surface methodology for process optimization in livestock wastewater treatment: A review

Reza,

Chen,

Mao

2024

Heliyon

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“…For Mg/P 2, the amount of Mg is stoichiometrically higher than required to form struvite, promoting the P recovery by other complexes. For example, Mg 3 (PO 4 ) 2 has an inferior solubility product constant (10 −25.2 [32]) compared to struvite (with the most reported values between 10 −12.6 and 10 −13.26 [17]), showing the potential to co-precipitate and form impurities in the final product (struvite). Indeed, other authors report the negative impact of higher Mg/P molar ratios in struvite purity [30].…”

Section: Influence Of the Main Operating Conditionsmentioning

confidence: 99%

Nutrient Recovery via Struvite Precipitation from Wastewater Treatment Plants: Influence of Operating Parameters, Coexisting Ions, and Seeding

Santos,

Mendes,

Alvarenga

et al. 2024

Water

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Phosphorus (P) is a critical element for life, and wastewater treatment systems can be strategic points for its recovery, thereby avoiding eutrophication pollution in nature. The aim of this research was to investigate P recovery via struvite, namely in terms of the influence of operating parameters, coexisting interfering ions, and seeding. This paper focuses on synthetic solutions, although an assessment was performed on wastewater. The results of the assessment indicated that, in the synthetic solution, the minimum concentration for struvite precipitation is about 30 mg P/L, and that the Mg/P molar ratio of 1 promotes P removal efficiency with less contribution from other minerals. In order to assess the results in terms of real-world scenarios, the influence of coexisting ions (calcium and sodium) was investigated. Calcium was shown to have the greatest impact on the process, as 80% was removed for an initial concentration of 200 mg Ca/L. Indeed, these experiments generated an amorphous precipitate that did not contain struvite. The utilization of biomass ash (size < 63 µm) as seeding in crystallization increased the P removal efficiency compared to the sample without seed and helped to control the pH. The precipitation experiments with wastewater demonstrated good P removal efficiencies (over 90%) but indicated a reduction in the purity of the final product (struvite was a minor crystalline phase identified in XRD—15%wt).

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Phosphate recovery from swine wastewater by struvite precipitation and process optimization using response surface methodology

Cited by 16 publications

References 49 publications

Enhancing Phosphorus Recovery and Dewaterability of Waste Activated Sludge for Combined Effect of Thermally Activated Peroxydisulfate and Struvite Precipitation

Enhancing Phosphorus Recovery and Dewaterability of Waste Activated Sludge for Combined Effect of Thermally Activated Peroxydisulfate and Struvite Precipitation

Response surface methodology for process optimization in livestock wastewater treatment: A review

Nutrient Recovery via Struvite Precipitation from Wastewater Treatment Plants: Influence of Operating Parameters, Coexisting Ions, and Seeding

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