Electrodialytic extraction of phosphorus from ash of low-temperature gasification of sewage sludge

Viader, Raimon Parés; Jensen, Pernille Erland; Ottosen, Lisbeth M.; Ahrenfeldt, Jesper; Hauggaard-Nielsen, Henrik

doi:10.1016/j.electacta.2015.05.025

Cited by 30 publications

(6 citation statements)

References 29 publications

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“…The dilemma between recovery of MSS nutrients and the risks related to direct application in food production systems is further complicated by a growing political demand for increased P-recycling on the one hand, and the increased concentration of heavy metals and loss of P plant availability often associated with incineration on the other hand (Jakobsen and Willett, 1986;Krüger et al, 2014;Mattenberger et al, 2008;Nzihou and Stanmore, 2013;Ottosen et al, 2013). To meet this challenge, new ways to upgrade ash from MSS incineration or recirculate MSS-P directly are under development (Atienza-Martínez et al, 2014;Franz, 2008;Ottosen et al, 2016;Parés Viader et al, 2015;Vogel et al, 2013;Xu et al, 2012). An optimal solution for MSS handling would utilize the energy potential of the MSS, preserve P and other nutrients in a plant-available form, reduce volume and weight, remove heavy metals, destroy pathogens and organic xenobiotics and be cheap and reliable.…”

Section: Introductionmentioning

confidence: 99%

Changes imposed by pyrolysis, thermal gasification and incineration on composition and phosphorus fertilizer quality of municipal sewage sludge

Thomsen

Sárossy

Ahrenfeldt

et al. 2017

Journal of Environmental Management

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Fertilizer quality of ash and char from incineration, gasification and pyrolysis of a single municipal sewage sludge sample were investigated by comparing composition and phosphorus (P) plant availability. A process for post oxidation of gasification ash and pyrolysis char was developed and the oxidized materials were investigated as well. Sequential extraction with full elemental balances of the extracted pools as well as scanning electron microscopy with energy dispersive X-ray spectroscopy were used to investigate the mechanisms driving the observed differences in composition and P plant availability in a short-term soil incubation study. The compositional changes related mainly to differences in the proximate composition as well as to the release of especially nitrogen, sulfur, cadmium and to some extent, phosphorus (P). The cadmium load per unit of P was reduced with 75-85% in gasification processes and 10-15% in pyrolysis whereas no reduction was observed in incineration processes. The influence on other heavy metals was less pronounced. The plant availability of P in the substrates varied from almost zero to almost 100% of the plant availability of P in the untreated sludge. Post-oxidized slow pyrolysis char was found to be the substrate with the highest P fertilizer value while ash from commercial fluid bed sludge incineration had the lowest P fertilizer quality. The high P fertilizer value in the best substrate is suggested to be a function of several different mechanisms including structural surface changes and improvements in the association of P to especially magnesium, calcium and aluminum.

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Section: Introductionmentioning

confidence: 99%

Changes imposed by pyrolysis, thermal gasification and incineration on composition and phosphorus fertilizer quality of municipal sewage sludge

Thomsen

Sárossy

Ahrenfeldt

et al. 2017

Journal of Environmental Management

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“…Among the thermal conversion methods, gasification of the biomass/biowaste is regarded as a clean energy production technology, which complies with the sustainable development rules. Gasification is also considered to be an effective utilization method for sewage sludge, simultaneously providing the possibility of recovering the valuable elements, such as phosphorus, from sewage sludge ash . Another significant benefit of application of this technology is the possibility to locate the gasification installation on the premises of the sewage treatment plant and use the energy generated from pyrolysis and gasification products for the highly energy-intensive sewage drying process.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Sewage Sludge Pyrolysis and Air Gasification of Its Chars

Urych

Smoliński

2016

Energy Fuels

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Optimal management and utilization of sewage sludge require innovative technological solutions. One of the prospective and novel concepts for the utilization of this waste, targeted at energy production, is the two-stage process combining pyrolysis and gasification. The paper presents the kinetic analysis of sewage sludge pyrolysis and air gasification of “hot” chars with the application of the thermogravimetric analyzer SDT Q600. The pyrolysis was performed below 1173 K in the inert gas atmosphere and with various heating rates of 1, 10, 50, and 100 K/min. The air gasification of chars was performed at 973, 1073, or 1173 K. The lumped model, which encompasses six first-order parallel reactions, was indicated as the most appropriate for the interpretation of the kinetics of sewage sludge pyrolysis. For the description of the char gasification stage, the Avrami–Erofeev model (A3) was proposed. The kinetic parameters estimated on the basis of the experimental data are the first published for sewage sludge “hot” char air gasification. The impact of the sewage sludge pyrolysis process parameters on the reactivity of chars in the in situ air gasification was also analyzed.

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“…These micronutrients are essential for plant growth, and their values have to be controlled for the production of fluid fertilizers, in accordance with Regulation EC no 2003,2003. Wilfert et al (2018) stated that phosphate recovery from SS is essential to the prospect of a CE, as it is one of the most feasible ideas and has been the subject of numerous studies (Viader et al 2015; Gorazda et al 2018). Acelas et al (2014) investigated the possibility of gaseous fuel production along with P extraction using the SCWG (supercritical water gasification) method.…”

Section: Resultsmentioning

confidence: 99%

“…What is more, most of the iron and heavy metals remain in the solid residue due to the low concentration of acids and the specific solid to liquid phase ratio. Viader et al (2015) investigated low-temperature gasification of SS with emphasis on P extraction from gasification ash. The study concluded that using a 2-compartment electro dialytic (ED) setup for P separation, it was possible to extract up to 26% of the P from pure SS ashes, while up to 90% of the P was extracted from the ashes from the gasification of SS and straw pellets mixture.…”

Section: Resultsmentioning

confidence: 99%

Gasification of sewage sludge within a circular economy perspective: a Polish case study

Werle

Sobek

2019

Environ Sci Pollut Res

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Sewage sludge (SS) is a by-product of wastewater treatment plant (WWTP) operation. Due to fast rates of urbanization and industrialization, and rapid population growth, the world community faces a serious challenge associated with its disposal. There is an urgent need to explore low cost, energy efficient, and sustainable solutions for the treatment, management, and future utilization of SS. Thermal conversion of SS is considered the most promising alternative for sustainable SS management. Among three main thermochemical processes, it seems that gasification (GAS) of SS has the most advantages. The aim of this paper is a presentation of the gasification process as a sustainable method of SS management that takes into account the idea of a circular economy (CE). Gaseous fuel production, phosphorus recovery potential, and solid adsorbent production during the gasification process are analyzed and discussed. Result of this study shows that the lower heating value (LHV) of the gas from SS GAS process is up to 5 MJ/m3n and it can be effectively utilize in an internal combustion engines. The analysis proved that solid fraction after the SS GAS process can be treated as a valuable phosphorus source and perspective adsorbent materials. The amount of P2O5 in this material was equal to 22.06%. It is similar to natural phosphate rocks (28.05%). The maximum of the adsorption capacity of the phenol was comparable with commercial activated carbon (CAC): 42.22 mg/g for solid fraction after SS GAS and 49.72 mg/g for CAC. Graphical abstract

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Electrodialytic extraction of phosphorus from ash of low-temperature gasification of sewage sludge

Cited by 30 publications

References 29 publications

Changes imposed by pyrolysis, thermal gasification and incineration on composition and phosphorus fertilizer quality of municipal sewage sludge

Changes imposed by pyrolysis, thermal gasification and incineration on composition and phosphorus fertilizer quality of municipal sewage sludge

Kinetics of Sewage Sludge Pyrolysis and Air Gasification of Its Chars

Gasification of sewage sludge within a circular economy perspective: a Polish case study

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