4.8 Article

Silicate mediated simultaneous in-situ CO2 sequestration and nutrients removal in anaerobic digestion

Journal

BIORESOURCE TECHNOLOGY
Volume 282, Issue -, Pages 125-132

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.03.004

Keywords

Anaerobic digestion; Mineral carbonation; CO2 sequestration; Nutrients removal; Silicates

Funding

  1. National Natural Science Foundation of China [51678280, 51708253]
  2. Special Program for the Taihu Lake Protection of Jiangsu Province [TH2016201]
  3. Fundamental Research Funds for the Central Universities [JUSRP11820]
  4. Postgraduate Research & Practice Innovation Program of Jiangsu Province [SJCX18 0637]

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This study investigated the reactions among CO32-, PO43-, NH4+, Mg2+, and Ca2+, under different CO32- concentration and Mg2+/Ca2+ ratio, and conducted sludge anaerobic digestion (AD) with silicate addition to achieve in-situ CO2 sequestration and nutrients removal. High CO32- concentration facilitated the formation of MgNH4PO4, and Mg2+/Ca2+ ratio of 1:1 achieved best CO32-, PO43-, and NH4+ removal in simulated anaerobic digestate. Supplementation of 40 g/L magnesium silicate combined with 20 g/L wollastonite decreased CO2 content in biogas from 28.2% to 19.0%, and removed PO43- and NH4+ by 61.8% and 21.2%, respectively, in AD. Simultaneous in-situ CO2 sequestration and nutrients removal was achieved by directed precipitation of PO43-, NH4+, and CO2 with silicate released Mg2+ and Ca2+, to form MgNH4PO4 and CaCO3. Meanwhile, methane production was improved by 51.2% with silicate supplementation. This study provides an attractive measure for CO2 and nutrients removal as well as methane production enhancement of sludge AD.

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