Phosphate immobilization from aqueous solution by fly ashes in relation to their composition

Chen, Jiangang; Kong, Hainan; Wu, Deyi; Chen, Xuechu; Zhang, Dalei; Sun, Zhenhua

doi:10.1016/j.jhazmat.2006.06.034

Cited by 152 publications

(62 citation statements)

References 32 publications

(46 reference statements)

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“…This byproduct of coal combustion is used as a low-cost adsorbent for cleaning flue gas from SOx, NOx, mercury and organics (Bossan et al, 1995;Seigneur et al, 1998), but also for cleaning wastewater from dissolved organic matter, heavy metals, pesticides and nutrients (Gupta et al, 2002). Finally, coal fly ash has received great attention in recent years as a potential material for phosphate removal from polluted effluents, as it is easily available and cost-effective (e.g., Gray and Schwab, 1993;Ugurlu and Salman, 1998;Cheung and Venkitachalam, 2000;Grubb et al, 2000;Agyei and Strydom, 2002;Yildiz, 2004;Oguz, 2005;Chen et al, 2007). In addition, PBC in sediment has been shown to adsorb organic compounds very efficiently (Cornelissen et al, 2005;Koelmans et al, 2006).…”

Section: Potential Consequences Of High Pbc Concentration In Halong Baymentioning

confidence: 99%

Seasonal dynamics of atmospheric and river inputs of black carbon, and impacts on biogeochemical cycles in Halong Bay, Vietnam

Mari

Van

Guinot

et al. 2017

Elementa: Science of the Anthropocene

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Mari, X, et al. 2017 Seasonal dynamics of atmospheric and river inputs of black carbon, and impacts on biogeochemical cycles in Halong Bay, Vietnam. Elem Sci Anth, 5: 75. DOI: https://doi.org/10.1525/elementa.255 , respectively. Dissolved BC (DBC) concentrations averaged 2.6 µmol C L -1 in both the SML and ULW. Seasonal variations indicated that PBC concentration in the SML was controlled by atmospheric deposition during the dry season, while riverine inputs controlled both PBC and DBC concentrations in ULW during the wet season. Spatiotemporal variations of PBC and DBC during the wet season suggest that river runoff was efficient in transporting PBC that had accumulated on land during the dry season, and in mobilizing and transporting DBC to the ocean. The annual river flux of PBC was about 3.8 times higher than that of DBC. The monsoon regime controls BC input to Halong Bay by favoring dry deposition of BC originating from the north during the dry season, and wet deposition and river runoff during the wet season. High PBC concentrations seem to enhance the transfer of organic carbon from dissolved to particulate phase by adsorbing dissolved organic carbon and stimulating aggregation. Such processes may impact the availability and biogeochemical cycling of other dissolved substances, including nutrients, for the coastal marine ecosystem. RESEARCH ARTICLE

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Section: Potential Consequences Of High Pbc Concentration In Halong Baymentioning

confidence: 99%

Seasonal dynamics of atmospheric and river inputs of black carbon, and impacts on biogeochemical cycles in Halong Bay, Vietnam

Mari

Van

Guinot

et al. 2017

Elementa: Science of the Anthropocene

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“…Therefore, the removal of P from wastewater is necessary for the control of eutrophication in lakes and similar stagnant water bodies ( } Ozacar 2003;Ou et al 2007). Many P removal technologies, including biological, chemical, and physical treatment methods, have been developed for the removal of phosphate from municipal and industrial effluents (Genz et al 2004;Chen et al 2007). Both biological and chemical technologies have been proven effective at removing P from wastewater.…”

Section: Introductionmentioning

confidence: 99%

“…Although various sorbents such as activated aluminum oxide, fly ash, zeolite, sand, and activated carbon have been investigated and applied at actual sites, identification of a cheap and effective sorbent is still in high demand (Genz et al 2004;de-Bashan and Bashan 2004;Chen et al 2007). Ali (2010) insisted that carbon-based sorbents proved to be the most costeffective in the removal of inorganic and organic pollutants from wastewater.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of phosphorus adsorption capacity of sesame straw biochar on aqueous solution: influence of activation methods and pyrolysis temperatures

Park

Kim

et al. 2015

Environ Geochem Health

119

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The phosphorus (P) adsorption characteristic of sesame straw biochar prepared with different activation agents and pyrolysis temperatures was evaluated. Between 0.109 and 0.300 mg L(-1) in the form of inorganic phosphate was released from raw sesame straw biochar in the first 1 h. The release of phosphate was significantly enhanced from 62.6 to 168.2 mg g(-1) as the pyrolysis temperature increased. Therefore, sesame straw biochar cannot be used as an adsorbent for P removal without change in the physicochemical characteristics. To increase the P adsorption of biochar in aqueous solution, various activation agents and pyrolysis temperatures were applied. The amount of P adsorbed from aqueous solution by biochar activated using different activation agents appeared in the order ZnCl2 (9.675 mg g(-1)) > MgO (8.669 mg g(-1)) ⋙ 0.1N-HCl > 0.1N-H2SO4 > K2SO4 ≥ KOH ≥ 0.1N-H3PO4, showing ZnCl2 to be the optimum activation agent. Higher P was adsorbed by the biochar activated using ZnCl2 under different pyrolysis temperatures in the order 600 °C > 500 °C > 400 °C > 300 °C. Finally, the amount of adsorbed P by activated biochar at different ratios of biochar to ZnCl2 appeared in the order 1:3 ≒ 1:1 > 3:1. As a result, the optimum ratio of biochar to ZnCl2 and pyrolysis temperature were found to be 1:1 and 600 °C for P adsorption, respectively. The maximum P adsorption capacity by activated biochar using ZnCl2 (15,460 mg kg(-1)) was higher than that of typical biochar, as determined by the Langmuir adsorption isotherm. Therefore, the ZnCl2 activation of sesame straw biochar was suitable for the preparation of activated biochar for P adsorption.

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“…Adsorption methods are widely implemented for phosphorus removal from wastewater because they are cheap, efficient, and allow for recovery of adsorbed phosphorus which can be used as fertilizer [1]. Several natural minerals, commercial products and by-products such as zeolite, bentonite, magnetite, alum sludge, fly ash, red mud, gibbsite and boehmite work as phosphorus adsorbents [4]- [9]. Due to their low cost, intrinsic properties and wide availability, clays are favorable in comparison with the other available adsorbents [1], [10], [11].…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of modified bentonite nano composites for phosphorus removal

2017

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Abstract. Due to the restrictions of phosphorus uptake in commonly applied treatment systems such as biological treatment and precipitation, it has been focused to find improved removal technologies. The application of natural nanomaterials as adsorbents is favorable due to high adsorption capacity, low environmental impact and reasonable cost. Specially modified nanoclay presents an efficient and cheap alternative with good recovery abilities. However, the material has to be characterized in detail to understand its behavior. For the characterization, modified bentonite (BNT) was produced through exchanging the cations naturally bound to the bentonite surface with metal polycations. In this study, solutions containing hydroxy-polycations of aluminum (Al-BNT), iron (Fe-BNT), and a combination of aluminum and iron (Al-Fe-BNT) were used to prepare three samples of BNT for phosphorus adsorption. To obtain BNT in an accurate surface -volume ratio, it has to be grinded and sieved. To gain information on the influence of grinding on particle size of modified BNT, the samples were characterized through X-ray fluorescence (XRF), X-ray powder diffraction (XRD), and scanning electron microscopy (SEM). A clear determnation of particle size using SEM was difficult due to agglomeration of samples as a result of milling process. The need of ultrasonication or another separation method increases the production effort of nanosized modified BNT. As due to the improved surface -volume ratio, BNT with smaller mean particle size is expected to perform better, leading to a higher adsorption capacity and adsorption rate and therefore, this additional effort might pay off.

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Phosphate immobilization from aqueous solution by fly ashes in relation to their composition

Cited by 152 publications

References 32 publications

Seasonal dynamics of atmospheric and river inputs of black carbon, and impacts on biogeochemical cycles in Halong Bay, Vietnam

Seasonal dynamics of atmospheric and river inputs of black carbon, and impacts on biogeochemical cycles in Halong Bay, Vietnam

Evaluation of phosphorus adsorption capacity of sesame straw biochar on aqueous solution: influence of activation methods and pyrolysis temperatures

Preparation and characterization of modified bentonite nano composites for phosphorus removal

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