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

被引：7

作者：

Liu, He ^{[1
,2
,3
]}

Gong, Linlin ^{[1
]}

Zhang, Yan ^{[1
,2
,3
]}

Jiang, Qianqian ^{[1
]}

Cui, Minhua ^{[1
,2
,3
]}

Zhang, Jie ^{[1
]}

Fu, Bo ^{[1
,2
,3
]}

Liu, Hongbo ^{[1
,2
,3
]}

机构：

[1] Jiangnan Univ, Sch Environm & Civil Engn, Wuxi 214122, Peoples R China

[2] Jiangsu Key Lab Anaerob Biotechnol, Wuxi 214122, Peoples R China

[3] Jiangsu Collaborat Innovat Ctr Water Treatment Te, Suzhou 215011, Peoples R China

来源：

BIORESOURCE TECHNOLOGY | 2019年 / 282卷

基金：

中国国家自然科学基金;

关键词：

Anaerobic digestion; Mineral carbonation; CO2; sequestration; Nutrients removal; Silicates; CARBON-DIOXIDE SEQUESTRATION; SEWAGE-SLUDGE; METHANE PRODUCTION; BIOGAS; WATER; INHIBITION; GENERATION; CAPTURE; IMPACT; WASTES;

D O I：

10.1016/j.biortech.2019.03.004

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

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.

引用

页码：125 / 132

页数：8

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