The goal of this work was to study the effective recovery of phosphorus from the supernatant of anaerobic digestion of sewage sludge by precipitation as struvite. The formation of struvite is envisioned as a promising process for nutrient removal and subsequent recovery, thus providing a strong incentive for its implementation, since the sewage is a renewable source of phosphorus. Struvite precipitation was obtained by controlled addition of Mg(OH)2 or MgCl2. We evaluated the removal of ammonia and phosphate under equimolar conditions of magnesium and magnesium stoichiometric excess of 100 to 200% relative to the limiting reagent, under a stirring speed of 300 rpm at pH 8, 9 and 10. The best condition was MgCl2 in 1:1 molar ratio to phosphate, considering the stoichiometric ratio [PO43−]:[NH4+] of 0.13 (presented by raw sample). The results show the best cost-benefit ratio, removal of phosphate of 90.6% and ammonium removal of 29%, resulting in 23 mg l−1 PO43− and 265 mg l−1 NH4+ concentration in effluent.
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Research Article|
February 04 2014
Study of the recovery of phosphorus from struvite precipitation in supernatant line from anaerobic digesters of sludge
Luciano Dias Xavier;
1Laboratório de Tratamento de Águas e Reuso de Efluentes (LabTare), Escola de Química, UFRJ, Cidade Universitária, Centro de Tecnologia, Bl. I, Sl. 124, Ilha do Fundão, 21941-909, Rio de Janeiro, Brazil
E-mail: ldx1982@poli.ufrj.br
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Magali Christe Cammarota;
Magali Christe Cammarota
2Departamento de Engenharia Bioquímica, Escola de Química, UFRJ, Cidade Universitária, Centro de Tecnologia, Bl. E, Sl. 203, Ilha do Fundão, Rio de Janeiro, Brazil
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Lídia Yokoyama;
Lídia Yokoyama
3Departamento de Processos Inorgânicos, Escola de Química, UFRJ, Cidade Universitária, Centro de Tecnologia, Bl. E, Sl. 206, Ilha do Fundão, Rio de Janeiro, Brazil
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Isaac Volschan, Junior
Isaac Volschan, Junior
4Departamento de Recursos Hídricos e Meio Ambiente, Escola Politécnica, UFRJ, Cidade Universitária, Centro de Tecnologia, Bl. D, Sl. 204, Ilha do Fundão, Rio de Janeiro, Brazil
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Water Sci Technol (2014) 69 (7): 1546–1551.
Article history
Received:
June 10 2013
Accepted:
January 09 2014
Citation
Luciano Dias Xavier, Magali Christe Cammarota, Lídia Yokoyama, Isaac Volschan; Study of the recovery of phosphorus from struvite precipitation in supernatant line from anaerobic digesters of sludge. Water Sci Technol 1 April 2014; 69 (7): 1546–1551. doi: https://doi.org/10.2166/wst.2014.033
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