Phosphorus Recovery from Incinerated Sewage Sludge Ash Using Electrodialysis Coupled with Plant Extractant Enhancement Technology

Sun, Ying; Wang, Zexu; Chen, Jingyan; Fang, Yangfan; Wang, Lihua; Pan, Wei; Zou, Boyuan; Qian, Guangren; Xu, Yunfeng

doi:10.2139/ssrn.4293133

Cited by 2 publications

(2 citation statements)

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“…Several techniques have been available to remove heavy metal ions from wastewater prior to being released into the environment. Elimination of heavy metals can be achieved through various methods, including nanofiltration, ion exchange, phytoremediation, chemical precipitation, electrocoagulation, and adsorption [6][7][8][9][10][11][12]. Despite the effectiveness of these aforementioned techniques, some parameters contribute to its drawback i.e., sludge generation, maintenance, equipment cost, energy consumption, low efficiency, and time-consuming.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Heavy Metals from Contaminated Water using Leachate Modular Tower

Ikechukwu

Adu

2023

Civ Eng J

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The heavy metals (HMs) and metalloids such as Cr(VI), As(Ill), and Pb(II) in contaminated water are toxic even at trace levels and have caused devastating negative health impacts on human beings. Hence, the effective adsorption of these heavy metals from contaminated water is important to protect biodiversity, hydrosphere ecosystems, and human beings. In this study, a leachate modular tower (LMT) was developed for the singular purpose of adsorbing HMs. The LMT contained nano-slag as a liner, which was synthesized from slag. The nano-slag was blended in different proportions of 90:10; 80:20, 70:30, 60:40, and 50:50 to the combined mass of clay and nano-slag, to evaluate the most efficient ratio of the blends capable of adsorbing HMs and metalloids with 100% efficiency. A series of leachate tests were performed to evaluate the adsorption capacity of LMT with different embedded liners. Attenuation periods of 2, 5, 7, and 10 days with a temperature of 500 °C were also selected to improve the sorption rate and uptake of HMs. Subsequently, the effluents were subjected to inductive coupled plasma mass spectrometry (ICP-MS) tests to evaluate the concentrations and percentages of adsorbed HMs, which were calculated using a pseudo-first-order adsorption model. The results revealed that the removal of 98%As, 99%Cd, and 99.9% Pb was achieved with a 50%:50% ratio of soil and nano-slag as the liner at 10 days equilibrium period. Furthermore, 98%Zn, 95.45%Cu, 93.3%Fe, 97%Ni, and 89% Hg were achieved upon further investigation using the same dosage of soil and nano-slag and equilibrium conditions. The scanning electron microscopy (SEM) tests demonstrated that some traces of the absorbed HMs and metalloids were found on the liner surfaces, indicating significant changes in microstructure. The results indicated the sorption rate increased significantly due to the elevated temperature, aluminosilicate structure, and prolonged attenuation period, which are also associated with an elevated pH level and higher cation exchange capacity (CEC), of the liner. Doi: 10.28991/CEJ-2023-09-06-017 Full Text: PDF

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Section: Introductionmentioning

confidence: 99%

Adsorption of Heavy Metals from Contaminated Water using Leachate Modular Tower

Ikechukwu

Adu

2023

Civ Eng J

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“…Li et al ( 2018 ) pointed out the potential added value in utilizing the residual SSA after P extraction in construction materials. Suspending the SSA in H 2 SO 4 (Ebbers et al 2015 ) or hydrolyzed polymaleic anhydride (Sun et al 2022 ) during ED may hamper the utilization of the SSA. In line with utilizing the SSA after P recovery, it was shown that the residual SSA after 2C-ED has the potential for use as cement replacement in concrete (Kappel et al 2018 ) or clay replacement in bricks (Ottosen et al 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Phosphorous extraction and heavy metal separation from sewage sludge ash by two-compartment electrodialysis in an upscaled tube reactor

Ottosen,

Thornberg

2023

Environ Sci Pollut Res

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Two-compartment electrodialytic extraction (2C-ED) is a one-step process for the simultaneous phosphorous extraction and separation of heavy metals from sewage sludge ash (SSA). The process is driven by an applied electric DC field, which can be supplied from renewable sources. The proof-of-concept of the method was conducted in small laboratory cells; however, upscaling to a continuous 2C-ED process, which additionally can treat SSA suspensions at a low liquid-to-solid (L:S) ratio, requires a new design. This paper presents such a new design. In principle, ED consists of two compartments separated by a cation exchange membrane. One compartment contains a suspension of SSA in water and the anode. A cathode is placed in the other compartment. Electrolysis at the anode acidifies the suspension causing the dissolution of phosphorous and heavy metals. The heavy metals are separated from the suspension by electromigration into the catholyte, whereas the dissolved phosphorous remains in the dispersion solution. In the new design, the SSA was suspended in a tube-shaped reactor with the cation exchange membrane covering the outside. The reactor was placed in a container with the catholyte. Periodically turning off the reactor kept SSA in suspension even at a low L:S ratio without corners and pockets where the SSA otherwise tends to settle. Five 2C-ED experiments were conducted with 1.5 to 3 kg SSA at varying currents and durations. Up to 89% P was extracted. The extracted P was concentrated in the dispersion solution of the SSA suspension, where the obtained P-related concentrations of heavy metals were far below the limiting values for spreading on agricultural land. The experiments underlined that treating the SSA in a suspension with a low L:S ratio is advantageous. A comparison to previous laboratory experiments in small cells treating 50 g SSA shows a significantly more efficient use of the applied current in the new reactor setup. Thus, the new reactor design for 2C-ED fulfilled the set criteria for the operation and did additionally result in a higher efficiency than the laboratory setups, i.e., the design can be the first step towards an upscaling.

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Phosphorus Recovery from Incinerated Sewage Sludge Ash Using Electrodialysis Coupled with Plant Extractant Enhancement Technology

Cited by 2 publications

References 0 publications

Adsorption of Heavy Metals from Contaminated Water using Leachate Modular Tower

Adsorption of Heavy Metals from Contaminated Water using Leachate Modular Tower

Phosphorous extraction and heavy metal separation from sewage sludge ash by two-compartment electrodialysis in an upscaled tube reactor

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