Extraction and precipitation of phosphorus from sewage sludge

Shiba, Nothando C.; Ntuli, Freeman

doi:10.1016/j.wasman.2016.07.031

Cited by 111 publications

(65 citation statements)

References 15 publications

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“…Approaches to P recovery include electrodialytic process (Guedes et al, 2014), thermochemical treatment (Havukainen et al, 2016) and chemical extraction (Ottosen et al, 2013). Among these, chemical extraction is the most widely used method due to its simple process and low cost (Donatello and Cheeseman, 2013;Shiba and Ntuli, 2016). Various extractants have been investigated for their P extraction potential, including inorganic acids, organic acids, alkalis and chelating agents, however, the study on the effects of these extractants on the leaching characteristics of P and trace elements in ISSA is scarce.…”

Section: Introductionmentioning

confidence: 99%

Change in re-use value of incinerated sewage sludge ash due to chemical extraction of phosphorus

Chen

Wang

et al. 2018

Waste Management

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The potential of six different extractants to recover phosphorus (P) from incinerated sewage sludge ash (ISSA) was evaluated. Secondary effects such as the co-dissolution of Zn and Cu were also considered. The residual ISSA from each study was assessed in particular detail, focusing on the leachability of remaining Zn and Cu, major element composition, crystalline phases and overall degree of crystallinity and particle size distribution. The residual ISSA was also evaluated as a pozzolanic material using a Strength Activity Index (SAI) test with mortars containing Portland cement with a 20% substitution by ISSA. All results were compared to tests with untreated ISSA. Overall, the use of 3 of the 6 extractants could be ruled out due to poor P recovery potential and/or a serious compromise of the potential reuse of residual ISSA in Portland cement-based materials. The results highlight the added value of considering the potential reuse of residual ISSA when trying to optimize P recovery from ISSA by wet methods.

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Section: Introductionmentioning

confidence: 99%

Change in re-use value of incinerated sewage sludge ash due to chemical extraction of phosphorus

Chen

Wang

et al. 2018

Waste Management

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“…However, negative results were observed based from SEM-EDX and XRF. Reasons for not being able to precipitate struvite could lie from the amount of phosphorus in the wastewater and/or sludge, the presence of contaminants such as iron, calcium, and aluminum which easily bind with phosphate, and the molar ratio of Mg:N:P. For future work, it is recommended to use cation exchange resins [4,5] to eliminate interferences such as iron and aluminum and increase the magnesium and ammonia concentration. In addition, the use of biological nutrient removal technologies (BNRT) could help in increasing phosphorus concentration in sludge.…”

Section: Resultsmentioning

confidence: 99%

“…The effect of reagents such as sodium hydroxide (NaOH) and sulfuric acid (H2SO4) was investigated. Sulfuric acid has been used in previous studies to release phosphorus from sludge [4,5]. The problem with using sulfuric acid is the release of interfering ions such as Fe 3+ and Ca 2+ are also released and could bind and form unwanted precipitates [3].…”

Section: Effect Of Reagent Used For Hydrolysismentioning

confidence: 99%

“…The ideal stoichiometric Mg:N:P ratio is 1:1:1. However, Shiba and Ntuli [5] stated that a ratio of 1:3:4 would be ideal for struvite precipitation from sludge. Table 3 shows the elemental analysis of samples using x-ray fluorescence analysis.…”

Section: Scanning Electron Microscope With Energy Dispersive X-ray (Smentioning

confidence: 99%

“…Lastly, it has lower impurity than other phosphate fertilizers [2]. It has been proven that struvite can be precipitated from wastewater and sludge, and it is proven to be an effective fertilizer [4][5][6] . However, in general, struvite recovery or phosphorus recovery has not been explored in the Philippines.…”

Section: Introductionmentioning

confidence: 99%

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Phosphorus recovery from wastewater and sludge

et al. 2019

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Wastewater and sludge are potential resource of phosphorus (P) for fertilizer production. One method of recovering phosphorus is via chemical precipitation. In the study, phosphorus was recovered from wastewater and sludge. First, hydrolysis was carried out to release the phosphorus in the sludge by the addition of 1.0M acid (sulfuric acid) or base (sodium hydroxide) solution mixed for three hours at 200 rpm. The hydrolyzed sludge was filtered, and the pH of the solution was adjusted to 9.0. Precipitation for both wastewater and hydrolyzed sludge solution was carried out using magnesium chloride hexahydrate (MgCl2•6H2O) and ammonium chloride (NH4Cl). The mixture was stirred for an hour for crystallization. Precipitates were allowed to settle for 24 hours before it was filtered and dried in an oven at 55-58oC for 24 hours. The dried sample was grinded and characterized using Fourier transform infrared spectroscopy (FTIR), x-ray fluorenscence (XRF), and scanning electron microscope with energy-dispersive x-ray spectroscopy(SEM-EDX).

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