利用硅灰石原位改善厌氧消化微生物电解池的产气特性
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摘要
厌氧消化-微生物电解池(Anaerobic digestion-Microbial electrolysis cell,AD-MEC)具有有机物降解速度快、降解率高的优点,但其所产沼气中依然存在CO_2含量较高的问题.为降低AD-MEC所产沼气中CO_2的含量,本研究将矿物碳酸化耦合入AD-MEC中,研究添加硅灰石对AD-MEC中CO_2的固定效果.实验结果表明,添加硅灰石可使AD-MEC中CO_2产生量减少40.0%,沼气中CO_2含量从10.0%±1.3%减少到4.5%±1.1%;X射线衍射(XRD)及扫描电镜-能谱(SEM-EDS)分析表明了CaCO_3沉淀的生成,证明硅灰石介导矿物碳酸化固定了AD-MEC中的CO_2.此外,添加硅灰石使Ca~(2+)溶出,缓冲了pH,减轻了厌氧消化产酸阶段对产甲烷菌的抑制,促进了有机物的降解,可溶性化学需氧量(SCOD)去除率提高了11.2%,并使CH_4产量提高18.0%,CH_4产率达到305 mL·g~(-1),沼气中CH_4含量达到95.5%±1.2%.硅灰石的添加实现了AD-MEC中CO_2的原位捕获,同时增益了厌氧消化效果,提高了甲烷产量.
Anaerobic digestion-Microbial electrolysis cell(AD-MEC) has the advantages of high degradation rate and high degradation efficiency for organic matters. However, CO_2 still exists in its produced biogas with relatively high content. In order to reduce the CO_2 content in biogas, mineral carbonation was coupled in AD-MEC with wollastonite addition in this study. The experimental results show that the addition of wollastonite reduced the CO_2 production in AD-MEC by 40.0%, decreased CO_2 content in biogas from 10.0%±1.3% to 4.5%±1.1%. Results of X-ray diffraction(XRD) and scanning electron microscopy-energy spectroscopy(SEM-EDS) indicate the formation of CaCO_3 precipitate, indicating that CO_2 was fixed in AD-MEC by wollastonite mediated mineral carbonation. In addition, the release of Ca~(2+) from the wollastonite buffered pH during VFAs production and alleviated the inhibition of methanogenesis in the AD-MEC, and improved the degradation of organic matters, with SCOD removal increased by 11.2%. The yield of CH_4 improved by 18.0%, while the productivity of CH_4 reached 305 mL·g~(-1), and the content of CH_4 in biogas reached 95.5%±1.2%. Wollastonite addition simultaneously achieved in-situ CO_2 sequestration and CH_4 production promotion in AD-MEC.
Anaerobic digestion-Microbial electrolysis cell(AD-MEC) has the advantages of high degradation rate and high degradation efficiency for organic matters. However, CO_2 still exists in its produced biogas with relatively high content. In order to reduce the CO_2 content in biogas, mineral carbonation was coupled in AD-MEC with wollastonite addition in this study. The experimental results show that the addition of wollastonite reduced the CO_2 production in AD-MEC by 40.0%, decreased CO_2 content in biogas from 10.0%±1.3% to 4.5%±1.1%. Results of X-ray diffraction(XRD) and scanning electron microscopy-energy spectroscopy(SEM-EDS) indicate the formation of CaCO_3 precipitate, indicating that CO_2 was fixed in AD-MEC by wollastonite mediated mineral carbonation. In addition, the release of Ca~(2+) from the wollastonite buffered pH during VFAs production and alleviated the inhibition of methanogenesis in the AD-MEC, and improved the degradation of organic matters, with SCOD removal increased by 11.2%. The yield of CH_4 improved by 18.0%, while the productivity of CH_4 reached 305 mL·g~(-1), and the content of CH_4 in biogas reached 95.5%±1.2%. Wollastonite addition simultaneously achieved in-situ CO_2 sequestration and CH_4 production promotion in AD-MEC.
引文
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Min Y J,Li Q Y,Voltolini M,et al.2017.Wollastonite carbonation in water-bearing supercritical CO2:Effects of particle size [J].Environmental Science & Technology,51(21):13044-13053
Park A H A,Jadhav R,Fan L S,et al.2003.CO2 Mineral Sequestration:Chemically enhanced aqueous carbonation of serpentine[J] The Canadian Journal of Chemical Engineering,81:885-890
Ran Z,Gefu Z,Kumar J A,et al.2014.Hydrogen and methane production in a bio-electrochemical system assisted anaerobic baffled reactor [J].Int J Hydrogen Energy,39(25):13498-13504
Rau G H,Carroll S A,Bourcier W L,et al.2013.Direct electrolytic dissolution of silicate minerals for air CO2 mitigation and carbon-negative H2 production[J].Proceedings of the National Academy of Sciences,110(25):10095-10100
尚梦.2009.污泥破解预处理技术和破解后污泥厌氧消化效能研究[D].武汉:武汉大学
Shen Y,Linville J L,Urgun-Demirtas M,et al.2015.Producing pipeline-quality biomethane via anaerobic digestion of sludge amended with corn stover biochar with in-situ CO2 removal[J].Applied Energy,158:300-309
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Wang H,Ren Z J.2013.A comprehensive review of microbial electrochemical systems as a platform technology[J].Biotechnology Advances,31(8):1796-1807
吴亭亭,杨暖,刘建,等.2017.单室微生物电解池处理黄水产甲烷[J].应用与环境生物学报,23(5):907-912
向元英,杨暖,杨霞,等.2016.单室微生物电解池强化混合脂肪酸产甲烷[J].应用与环境生物学报,22(5):872-877
谢作甫.2014.MFC脱氮产电性能及电导率研究[D].杭州:浙江大学
杨林军,张霞,孙露娟等.2007.二氧化碳矿物碳酸化固定的技术进展[J].现代化工,27(8):13-16
Zhang S H,You J P,Christian Kennes,et al.2018.Current advances of VOCs degradation by bioelectrochemical systems:A review[J].Chemical Engineering Journal,334:2625-2637
Zhang Y,Zhang L H,Liu H,et al.2019.Carbon dioxide sequestration and methane production promotion by wollastonite in sludge anaerobi digestion[J].Bioresource Technology,272:194-201
Bennett P C,Rogers J R,Choi W J,et al.2001.Silicates,silicate weathering,and microbial ecology[J].Geomicrobiology Journal,18(1):3-19
薄涛,翟洪艳,季民.2017.不锈钢毡电极MEC甲烷原位纯化及原理[J].环境科学学报,37(11):4057-4063
Bo T,Zhu X Y,Zhang L X,et al.2014.A new upgraded biogas production process:Coupling microbial electrolysis cell and anaerobic digestion in single-chamber,barrel-shape stainless steel reactor [J].Electrochem Communication,45:67-70
Borole A,Reguera G,Ringeisen B,et al.2011.Electroactive biofilms:Current status and future research needs [J].Energy & Environmental Science,4:4813-4834
蔡伟伟.2014.MEC电化学体系与WAS厌氧消化体系耦合产能的初步研究[D].沈阳:辽宁大学
Cheng S A,Logan B E.2007.Sustainable and efficient biohydrogen production via electrohydrogenesis [J].Proceedings of the National Academy of Sciences,104(47):18871-18873
Cheng S A,Logan B E.2008.Evaluation of catalysts and membranes for high yield biohydrogen production via electrohydrogenesis in microbial electrolysis cells (MECs)[J].Water Science & Technology,58(4):853-857
Cheng S,Xing D F,Douglas F,et al.2009.Direct biological conversion of electrical current into methane by electromethanogenesis[J].Environmental Science & Technology,43:3953-3958
韩婷婷.2014.套筒型厌氧消化-微生物电解耦合反应器产甲烷效能分析[D].哈尔滨:哈尔滨工业大学
刘建,高平,张艳艳,等.2017.生活污水有机负荷率对连续流单室无膜微生物电解池性能的影响[J].应用与环境生物学报,23(3):415-419
Liu H,Logan B E.2004.Electricity generation using an air-cathode single chamber microbial fuel cell in the presence and absence of a proton exchange membrane [J].Environmental Science & Technology,38 (14):4040-4046
Logan B E,Call D,Cheng S A,et al.2008.Microbial electrolysis cells for high yield hydrogen gas production from Organic matter [J].Environmental Science & Technology,42(23):8630-8640
Min Y J,Li Q Y,Voltolini M,et al.2017.Wollastonite carbonation in water-bearing supercritical CO2:Effects of particle size [J].Environmental Science & Technology,51(21):13044-13053
Park A H A,Jadhav R,Fan L S,et al.2003.CO2 Mineral Sequestration:Chemically enhanced aqueous carbonation of serpentine[J] The Canadian Journal of Chemical Engineering,81:885-890
Ran Z,Gefu Z,Kumar J A,et al.2014.Hydrogen and methane production in a bio-electrochemical system assisted anaerobic baffled reactor [J].Int J Hydrogen Energy,39(25):13498-13504
Rau G H,Carroll S A,Bourcier W L,et al.2013.Direct electrolytic dissolution of silicate minerals for air CO2 mitigation and carbon-negative H2 production[J].Proceedings of the National Academy of Sciences,110(25):10095-10100
尚梦.2009.污泥破解预处理技术和破解后污泥厌氧消化效能研究[D].武汉:武汉大学
Shen Y,Linville J L,Urgun-Demirtas M,et al.2015.Producing pipeline-quality biomethane via anaerobic digestion of sludge amended with corn stover biochar with in-situ CO2 removal[J].Applied Energy,158:300-309
孙宏扬.2014.污泥厌氧消化-微生物电解耦合工艺产甲烷效能分析[D].哈尔滨:哈尔滨工业大学
Walker J C G,Hays P B,Kasting J F.1981.A negative feedback mechanism for the long-term stabilization of Earth′s surface temperature[J].Journal of Geophysical Research:Oceans,86(C10):9776-9782
Wang H,Ren Z J.2013.A comprehensive review of microbial electrochemical systems as a platform technology[J].Biotechnology Advances,31(8):1796-1807
吴亭亭,杨暖,刘建,等.2017.单室微生物电解池处理黄水产甲烷[J].应用与环境生物学报,23(5):907-912
向元英,杨暖,杨霞,等.2016.单室微生物电解池强化混合脂肪酸产甲烷[J].应用与环境生物学报,22(5):872-877
谢作甫.2014.MFC脱氮产电性能及电导率研究[D].杭州:浙江大学
杨林军,张霞,孙露娟等.2007.二氧化碳矿物碳酸化固定的技术进展[J].现代化工,27(8):13-16
Zhang S H,You J P,Christian Kennes,et al.2018.Current advances of VOCs degradation by bioelectrochemical systems:A review[J].Chemical Engineering Journal,334:2625-2637
Zhang Y,Zhang L H,Liu H,et al.2019.Carbon dioxide sequestration and methane production promotion by wollastonite in sludge anaerobi digestion[J].Bioresource Technology,272:194-201