Determining the feasibility of phosphorus recovery as struvite from filter press centrate in a secondary wastewater treatment plant

Fattah, Kazi Parvez; Mavinic, Donald S.; Koch, Frank‐Thomas; Jacob, Cristina

doi:10.1080/10934520801960052

Cited by 52 publications

(47 citation statements)

References 15 publications

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“…Actually, pH values from 8.3 to 8.5 are enough for MAP precipitation by CO 2 stripping process. But many studies are showing that the optimal pH is in the range of 9 to 9.5 [33] [34]. The targeted pH of 9 was achieved after 4 hours of aeration.…”

Section: Influence Of Different Air Flow Ratesmentioning

confidence: 99%

pH Control during the Struvite Precipitation Process of Wastewaters

Radev¹,

Peeva²,

Nenov³

2015

JWARP

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The high concentration of phosphorus and nitrogen in wastewater and sludge could be lowered to a certain level by struvite (MgNH4PO4•6H2O) crystallization. One of the main factors for struvite formation is the solution pH. It can be adjusted by non-reagent carbon (CO2) dioxide stripping through the process of aeration. The intensity of the mass transfer between the air and the supernatant of dewatering sludge obtained from wastewater treatment plant is characterized by the volumetric liquid-side mass transfer coefficient, which can be estimated theoretically. It is found that the rate of pH increase depends strongly on the sparging area of the air distribution system while the air flow rate does not influence considerably the Dissolved Oxygen (DO) level which governs the CO2 stripping process. The theoretical calculated values of the volumetric mass transfer coefficient have been compared with those obtained experimentally. Based on the data obtained, relationships of pH/kLa (mass transfer coefficient) were developed. These correlations serve as a tool for prediction of pH during the struvite precipitation process.

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Section: Influence Of Different Air Flow Ratesmentioning

confidence: 99%

pH Control during the Struvite Precipitation Process of Wastewaters

Radev¹,

Peeva²,

Nenov³

2015

JWARP

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“…Almost 0.1g of crystals were dissolved in 50 mL of 0.5% nitric acid solution. In order to accelerate dissolution, the samples were stirred with a magnetic stirrer for 24 h, thereafter, samples were analyzed for magnesium, ammonia, orthophosphate, calcium, aluminum and iron using inductive coupled plasma (ICP) (Fattah et al, 2008).…”

Section: Crystals Composition and Puritymentioning

confidence: 99%

Technology of Microbial Electrolysis Cell with Statistical Optimization by Response Surface Methodology for Bio-Hydrogen Production and Phosphorus Recovery

Alshehri

2018

Int J Appl Sci Biotechnol

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In this study, two chamber microbial electrolysis cells (MECs) were used to investigate effect of applied voltage and concentration of influent COD on bio-hydrogen (H2) production and phosphorus (P) recovery. On the cathode chamber P as crystals were precipitated (the maximum was 94%), and verified as struvite, using X-ray diffraction and scanning electron microscopy analysis. Maximum of the H2 production rate was 0.31m 3 /m 3 /d. H2 production and P recovery have highly affected by applied voltage according to statistical optimization, while P recovery only had significantly affected by influent COD concentration. The range from 28 to 42%, was the total of energy recovery in the MEC. The current findings demonstrated capability of H2 production and P recovery using MECs technology.

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“…Approximately 0.05 g of crystals were dissolved in 50 mL of 0.5% nitric acid solution. In order to accelerate dissolution, the samples were stirred with a magnetic stirrer for 24 hours, after which samples were analyzed for magnesium, ammonia, orthophosphate, calcium, aluminum and iron using inductive coupled plasma (ICP) (Fattah et al, 2008). evaluate the adequacy of the models.…”

Section: Crystals Composition and Puritymentioning

confidence: 99%

Concurrent hydrogen production and phosphorus recovery in dual chamber microbial electrolysis cell

Almatouq

Babatunde

2017

Bioresource Technology

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Concurrent hydrogen (H 2 ) production and phosphorus (P) recovery were investigated in dual chamber microbial electrolysis cells (MECs). The aim of the study was to explore and understand the influence of applied voltage and influent COD concentration on concurrent H 2 production and P recovery in MEC. P was efficiently precipitated at the cathode chamber and the precipitated crystals were verified as struvite, using X-ray diffraction and scanning electron microscopy analysis. The maximum P precipitation efficiency achieved by the MEC was 95%, and the maximum H 2 production rate was 0.28 m 3 -H 2 /m 3 -d. Response surface methodology showed that applied voltage had a great influence on H 2 production and P recovery, while influent COD concentration had a significant effect on P recovery only. The overall energy recovery in the MEC was low and ranged from 25 ± 1 to 37 ± 1.7 %. These results confirmed MECs capability for concurrent H 2 production and P recovery.Keywords: Bio-electrochemical System; Phosphorus Recovery; Microbial Electrolysis Cell; Struvite; Response Surface Methodology IntroductionDue to population growth, the global demand for unsustainable resources is rising. As a result, concerns around resource depletion are increasing. Phosphorus is one of the most 2 important unsustainable nutrients on our planet. Phosphorus is essential for all forms of life, especially for plant growth. Unfortunately, estimates show that phosphorus rocks will be depleted within the next 50-100 years (Cooper et al., 2011). Therefore, alternative sources of phosphorus should be discovered to balance the high demand for phosphorus. Magnesium ammonium phosphate (struvite) is one of most common phosphate fertilizers that can be recovered from different streams of wastewater. Struvite is an efficient slow release fertilizer that can be used for crop growth, and is an excellent alternative for phosphate rocks (Rahman et al., 2014).Struvite precipitation occurs in the equimolecular concentration of magnesium (Mg), ammonium (NH 4 ) and (P); these elements combine with water to form struvite. The precipitation of these components is also highly dependent on pH, where struvite starts to precipitate at pH > 8 (Doyle & Parsons, 2002). The most common methods for P recovery as struvite are chemical addition and carbon dioxide stripping through aeration. These processes are effective for struvite precipitation; however, the operation cost is too high. Using chemical addition to raise the solution's pH can account for up to 97% of struvite cost (Jaffer et al., 2002;Morales et al., 2013).Microbial electrolysis cells (MECs) are a new and promising approach for hydrogen (H 2 ) production from organic matter, including wastewater and other renewable resources. In MECs, electrochemically active bacteria oxidise organic matter and generate CO 2 , electrons and protons. The bacteria transfer the electrons to the anode and the protons are released into the solution. The electrons then travel through a wire to a cathode and combine wit...

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Determining the feasibility of phosphorus recovery as struvite from filter press centrate in a secondary wastewater treatment plant

Cited by 52 publications

References 15 publications

pH Control during the Struvite Precipitation Process of Wastewaters

pH Control during the Struvite Precipitation Process of Wastewaters

Technology of Microbial Electrolysis Cell with Statistical Optimization by Response Surface Methodology for Bio-Hydrogen Production and Phosphorus Recovery

Concurrent hydrogen production and phosphorus recovery in dual chamber microbial electrolysis cell

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