Recovery of potassium from landfill leachate concentrates using a combination of cation-exchange membrane electrolysis and magnesium potassium phosphate crystallization

Li, Xinyang; Wang, Zhu; Wu, Yue; Wang, Chengwen; Zheng, Jianzhong; Xu, Kangning; Li, Jiyun

doi:10.1016/j.seppur.2015.01.035

Cited by 45 publications

(23 citation statements)

References 32 publications

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“…Adsorption has been used to remove phosphate and ammonia from wastewater, typically at bench and semi-industrial scale using clay minerals, metals and their composites, while filtration techniques have been explored as well (Goh et al, 2008;Huang et al, 2017;Satoshi et al, 2013;Yagi and Fukushi, 2012;Zulfiqar et al, 2014). Adsorption followed by crystals settling is particularly popular (Li et al, 2015;Li et al, 2017), with Ca 2+ or Mg 2+ based materials being typically used as precursors Peng et al, 2018;Stolzenburg et al, 2015). Other adsorbents include elements that have high affinity to phosphate and ammonia, mainly trivalent metals, such as Fe 3+ and Al 3+ , which have the added benefit of regeneration (Benyoucef and Amrani, 2012;Chiban et al, 2012;Deng et al, 2016;Egle et al, 2016;Gao et al, 2018;Goh et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Wastewater treatment valorisation by simultaneously removing and recovering phosphate and ammonia from municipal effluents using a mechano-thermo activated magnesite technology

Mavhungu

Mbaya

Masindi

et al. 2019

Journal of Environmental Management

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Phosphate and nitrate enrichment largely impair aquatic ecosystem functions and services, thus comprising an emerging problem of environmental concern. The problem pertains to developing countries where phosphate and nitrate discharge to surface water is on the rise due to a rapid growth in population. Herein, these pollutants (phosphate and ammonia) were removed from real municipal wastewater using a simple, fast, and cost-effective process. Raw cryptocrystalline magnesite, a mineral abundant in South Africa, was simply milled and calcined (mechano-thermo processing) in order to produce the activated magnesite (feed). The feed was then used in batch processing for pollutants adsorption and precipitation from real wastewater. The process was optimised by varying the treatment or contact time, feed dosage, concentration, pH, and temperature. The feed and product mineral (produced sludge) were characterised using X-ray Diffraction (XRD), field emission scanning electron microscopy (FESEM) compatible with energy dispersive spectroscopy (EDS), and Fourier Transform Infrared Spectrometer (FTIR). It was identified that the optimal conditions differed for each pollutant, highlighting the importance of tailoring the process to fit the local wastewater characteristics and as part of a treatment train system. Specifically, maximum P removal was achieved after 5 min of mixing, using 1 g L-1 of feed, 123 mg L-1 initial phosphate concentration, pH 8-10, and was not affected by temperature variations; whereas, for ammonia removal, optimal conditions were 180 min, 16 g L-1 feed dosage, 80 mg L-1 initial concentration, pH 10 and temperature > 45 °C. The optimal conditions for the removal of both pollutants from real wastewater were 30 min, 8 g L-1 dosage, 7.5 pH, 35 o C. Furthermore, Mg and Ca concentration was found to influence the process. Reduction in total dissolved solids and electrical conductivity suggest an attenuation of chemical species. Characterisation revealed that the product mineral obtained under the optimal conditions for pollutants removal is rich in quartz, periclase, brucite, calcite, magnesite, and struvite. This was further supported by the FTIR results, which indicated the presence of Mg-O, PO 4 3− , N-H and-OH stretches. In addition, the EDS verified the presence of Mg, Ca and P in product mineral. Results are suggestive of the high efficiency of the mechano-thermo activated magnesite treatment process for P and N removal and struvite crystallization. Thus, this technology could valorise municipal wastewater effluents and open new horizons for the

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Section: Introductionmentioning

confidence: 99%

Wastewater treatment valorisation by simultaneously removing and recovering phosphate and ammonia from municipal effluents using a mechano-thermo activated magnesite technology

Mavhungu

Mbaya

Masindi

et al. 2019

Journal of Environmental Management

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“…Furthermore, the created gaseous chlorine doesn't have to be discarded, but it can be utilized onsite as a handy agent to discolorize colored effluent. The second part of this research involves the extraction of potassium from remediated nanofiltration concentrations using electromigration and subsequently potassium retrieval by a [112]. To conserve energy, the microbial fuel cell was employed to retrieve nutrients from urine-containing wastewater [113,114].…”

Section: Nitrogenmentioning

confidence: 99%

Recovery of resources from industrial wastewater employing electrochemical technologies: status, advancements and perspectives

et al. 2021

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In the last two decades, water use has increased at twice the rate of population growth. The freshwater resources are getting polluted by contaminants like heavy metals, pesticides, hydrocarbons, organic waste, pathogens, fertilizers, and emerging pollutants. Globally more than 80% of the wastewater is released into the environment without proper treatment. Rapid industrialization has a dramatic effect on developing countries leading to significant losses to economic and health well-being in terms of toxicological impacts on humans and the environment through air, water, and soil pollution. This article provides an overview of physical, chemical, and biological processes to remove wastewater contaminants. A physical and/or chemical technique alone appears ineffective for recovering useful resources from wastewater containing complex components. There is a requirement for more processes or processes combined with membrane and biological processes to enhance operational efficiency and quality. More processes or those that are combined with biological and membrane-based processes are required to enhance operational efficiencies and quality. This paper intends to provide an exhaustive review of electrochemical technologies including microbial electrochemical technologies. It provides comprehensive information for the recovery of metals, nutrients, sulfur, hydrogen, and heat from industrial effluents. This article aims to give detailed information into the advancements in electrochemical processes to energy use, improve restoration performance, and achieve commercialization. It also covers bottlenecks and perspectives of this research area.

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“…The physical-chemical process can be applied to pretreatment, tertiary processing, and the overall leachate treatment process. The purpose of the oxidation process in leachate processing is to oxidize organic substances to the most stable form of oxidation, namely into carbon dioxide and water, and increase the biodegradability of organic pollutants suitable for economic, biological processing [10] Furthermore, in principle, physicochemical technologies are suitable for wastewater treatment with extremely low biodegradability, such as stabilized leachate [11] Ozone treatment is one of the strongest chemical processes in leachate processing, because it has the potential for oxidation to reduce stubborn organic fractions.…”

Section: Astesj Issn: 2415-6698mentioning

confidence: 99%

Impact of Salinity on Stabilized Leachate Treatment from Ozonation Process

Septiariva¹,

Suryawan²,

Sari³

et al. 2020

Adv. sci. technol. eng. syst. j.

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Recovery of potassium from landfill leachate concentrates using a combination of cation-exchange membrane electrolysis and magnesium potassium phosphate crystallization

Cited by 45 publications

References 32 publications

Wastewater treatment valorisation by simultaneously removing and recovering phosphate and ammonia from municipal effluents using a mechano-thermo activated magnesite technology

Wastewater treatment valorisation by simultaneously removing and recovering phosphate and ammonia from municipal effluents using a mechano-thermo activated magnesite technology

Recovery of resources from industrial wastewater employing electrochemical technologies: status, advancements and perspectives

Impact of Salinity on Stabilized Leachate Treatment from Ozonation Process

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