Crystal seed-enhanced ammonia nitrogen and phosphate recovery from landfill leachate using struvite precipitation technique

Lavanya, Addagada; Ramesh, Sri Krishnaperumal Thanga

doi:10.1007/s11356-021-14950-y

Cited by 16 publications

(2 citation statements)

References 45 publications

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“…As demonstrated in Figure , the typical molar concentrations of NH 4 + are much greater than the molar concentrations of Mg 2+ and PO 4 3– . Although there is no consensus on the optimum molar ratio of Mg 2+ /NH 4 + /PO 4 3– to maximize struvite recovery from leachate, 1–1.3:1.0:1.0 was found to be the most effective for struvite recovery. − This optimum ratio can be exclusive of different leachates based on the organics and interfering compounds (e.g., Na + , Ca 2+ , Al 3+ ). , Because magnesium and phosphate are found in lower concentrations in leachate than ammonium (median concentration of Mg 2+ /NH 4 + /PO 4 3– = 6.03/78.86/0.23 mM) (Figure ), magnesium and phosphate salts need to be added to precipitate struvite and effectively recover ammonia. In our critical analysis, we have identified a treatment cost of $0.17–1.98 per kg of struvite recovered from landfill leachate (Table ).…”

Section: Paradigm Shift In Landfill Leachate Treatment: Resource Reco...mentioning

confidence: 99%

Advancement and Challenges in Municipal Landfill Leachate Treatment–The Path Forward!

et al. 2022

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Although landfill leachate is a small volumetric fraction compared to municipal wastewater, its complexity raises concerns for researchers and practitioners. Emerging and novel treatment technologies are being investigated to address landfill leachate treatment challenges. In the past decade, leachate research shifted from the removal of contaminants to the simultaneous recovery of resources and removal of contaminants. While resource recovery is appealing, it is also questionable due to the economic feasibility and post-environmental impact of applied resources. Various emerging contaminants may remain in recovered resources, making recovery a less preferred option. Because of the ineffectiveness of biological treatment of emerging contaminants, such as per- and polyfluoroalkyl substances, leachate cotreatment has been restricted in some wastewater treatment plants. Thus, in the wake of emerging contaminants and stringent regulations, it seems wiser to develop effective, integrated leachate treatments in lieu of widely practiced biological cotreatment. The solid waste industry needs viable, cost-efficient, and readily executable technologies to effectively handle the upcoming need. Thus, in this paper, academic and industry experts discuss the progress, challenges, and future of leachate treatment. This paper provides a forward-thinking evaluation of the past decade’s advancements and challenges in the field of landfill leachate treatment.

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Section: Paradigm Shift In Landfill Leachate Treatment: Resource Reco...mentioning

confidence: 99%

Advancement and Challenges in Municipal Landfill Leachate Treatment–The Path Forward!

et al. 2022

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“…According to the results of this research, 1.13 kg of struvite (95% purity) was prepared per ton of WAS. Considering that the selling price of struvite is 420 $/ton [45], the income obtained by selling struvite is 0.45 $/ton of WAS, which adequately covers the cost of struvite precipitation (0.14 $/ton). When it comes to the biochemical treatment with design of MLSS (mixed liquor suspended solids) of 3000 mg/L, 13.33 tons of wastewater produces 1 ton of WAS (moisture content 96%) and the cost of WAS treatment is 0.96 $/ton wastewater.…”

Section: Effect Of Struvite Precipitationmentioning

confidence: 99%

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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The Role of Civil Engineering in Achieving UN Sustainable Development Goals

Lavanya

Ramesh

Ratha

et al. 2022

Advances in Sustainable Materials and Resilient Infrastructure

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Crystal seed-enhanced ammonia nitrogen and phosphate recovery from landfill leachate using struvite precipitation technique

Cited by 16 publications

References 45 publications

Advancement and Challenges in Municipal Landfill Leachate Treatment–The Path Forward!

Advancement and Challenges in Municipal Landfill Leachate Treatment–The Path Forward!

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

The Role of Civil Engineering in Achieving UN Sustainable Development Goals

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