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Phosphorous recovery from sewage sludge using calcium silicate hydrates.
Lee, Chang-Gu; Alvarez, Pedro J J; Kim, Hee-Gon; Jeong, Seongpil; Lee, Seunghak; Lee, Ki Bong; Lee, Sang-Hyup; Choi, Jae-Woo.
Afiliação
  • Lee CG; Civil and Environmental Engineering, Rice University, Houston, TX 77005, United States.
  • Alvarez PJJ; Civil and Environmental Engineering, Rice University, Houston, TX 77005, United States.
  • Kim HG; Center for Water Resource Cycle Research, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul 02792, Republic of Korea; Department of Chemical and Biological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.
  • Jeong S; Center for Water Resource Cycle Research, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul 02792, Republic of Korea.
  • Lee S; Center for Water Resource Cycle Research, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul 02792, Republic of Korea; Green School, Korea University, Anam Dong 5-1, Seongbuk-gu, Seoul 02841, Republic of Korea.
  • Lee KB; Department of Chemical and Biological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.
  • Lee SH; Center for Water Resource Cycle Research, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul 02792, Republic of Korea; Green School, Korea University, Anam Dong 5-1, Seongbuk-gu, Seoul 02841, Republic of Korea.
  • Choi JW; Center for Water Resource Cycle Research, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul 02792, Republic of Korea; Division of Energy & Environment Technology, KIST School, Korea University of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 0279
Chemosphere ; 193: 1087-1093, 2018 Feb.
Article em En | MEDLINE | ID: mdl-29874736
Phosphorous is an essential limiting nutrient for which there is no substitute. Its efficient recovery from sewage treatment plants is important to mitigate both dependence on limited reserves of exploitable phosphate rock and eutrophication of surface waters. Here, we evaluate the use of calcium silicate hydrates (CSH) to recover phosphorous eluted from sewage sludge. Phosphorous elution experiments were conducted with acid and base leaching solutions. The phosphorous recovery efficiency with CSH was compared to that with other calcium compounds, and the final product was analyzed to assess its potential value as fertilizer. Dried sewage sludge from the West Lake Ecological Water Resource Center, South Korea, having 123 g-P kg-1, was used for these tests. About 55% of the phosphorus in the sludge was released with an elution solution of 0.1 M H2SO4. A dose of 15 g L-1 of CSH recovered 89.6% of the eluted phosphorous without the need for additional pre-treatment, and the resulting calcium phosphate product (in brushite form, based on XRD analysis) exhibited superior settleability than that resulting from Ca(OH)2- and CaCl2-induced precipitation. XRD peaks of the calcium sulfate hydrate (in gypsum form) and residual CSH were also observed. The final product contained a relatively high content of the total P2O5 eluted in a 2% citric acid solution (43.1%), which suggests that it might be readily used to fertilize crops.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Fósforo / Esgotos / Silicatos / Compostos de Cálcio Idioma: En Revista: Chemosphere Ano de publicação: 2018 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Fósforo / Esgotos / Silicatos / Compostos de Cálcio Idioma: En Revista: Chemosphere Ano de publicação: 2018 Tipo de documento: Article