摘要
碳捕集及资源化利用对缓解全球变暖、冰川融化等环境问题具有重要意义,是实现碳中和的有效途径之一。传统的化学吸收法捕集CO_(2)能耗高,而微藻生物固定CO_(2)时,由于CO_(2)在培养基中溶解度低,导致CO_(2)逃逸,造成固碳效率低及CO_(2)二次排放。化学吸收与微藻固碳耦合系统具有潜在的降低再生能耗及提升一体化CO_(2)资源化利用优势。采用氨水作为化学吸收剂,充分吸收CO_(2)后生成的NH_(4)HCO_(3)部分替代传统微藻培养过程中的氮源NaNO_(3),为降低高浓度NH_(4)^(+)-N对螺旋藻的毒性,进一步降低耦合系统的氮源成本,采用分批补加NH_(4)HCO_(3)的形式优化氮源组成。结果表明,分批补加NH_(4)HCO_(3)可在不影响螺旋藻生长的情况下,降低NaNO_(3)总需求量,促进脂质合成。每6 d补加50 mg/L NH_(4)HCO_(3)螺旋藻的固氮率和固碳能力最高,分别为32.33%和149.24 mg/(L·d),并在第12天获得最大生物量1.30 g/L。此外,不同分批补料方式影响了耦合系统中螺旋藻后期产物的形成,每6 d补加50 mg/L NH_(4)HCO_(3)有利于螺旋藻蛋白质生产,质量浓度达889.17 mg/L;每6 d补加75 mg/L NH_(4)HCO_(3)有利于螺旋藻碳水化合物的累积,质量浓度达1632.86 mg/L。本研究通过分批补料为化学吸收-微藻转化耦合体系推广提供指导,具有一定应用前景。
Carbon capture and resource utilization are of great significance to alleviate environmental problems such as global warming and glacier melting,and it is one of the effective ways to achieve carbon neutrality.The conventional CO_(2)capture way by chemical absorption has the problem of high energy consumption.Due to the low solubility of CO_(2)in the medium,CO_(2)escape is often caused when fixed by microalgae,then resulting in low carbon fixation efficiency and secondary CO_(2)emissions.Chemical absorption and microalgae conversion hybrid system has the potential advantages of reducing renewable energy consumption and improving CO_(2)resource utilization.Ammonia was used as a chemical absorber,and NH_(4)HCO_(3)generated after fully absorbing CO_(2)partially replaced NaNO_(3)in the process of traditional microalgae culture.In order to reduce the toxicity of high concentration NH_(4)^(+)-N to Spirulina and further reduce the nitrogen source cost of the coupling system,the nitrogen source composition was optimized by batch addition of NH_(4)HCO_(3).Results shows that batch addition of NH_(4)HCO_(3) can reduce the required total nitrogen content and promote the synthesis of lipid without affecting the growth of Spirulina.When 50 mg/L NH_(4)HCO_(3)is added every 6 days,the nitrogen fixation rate and carbon fixation capacity are the highest,which are 32.33%and 149.24 mg/(L·d),respectively,and the maximum biomass is 1.30 g/L on the 12th day.In addition,the components of Spirulina in the coupling system are affected by different feding-batch modes.Supplementation of 50 mg/L NH_(4)HCO_(3)every 6 days is beneficial to the production of protein,which reaches 889.17 mg/L.Adding 75 mg/L NH_(4)HCO_(3)every 6 days is conducive to the accumulation of carbohydrates in Spirulina,reaching 1632.86 mg/L.This study provides guidance for the further application of the chemical absorption and microalgae conversion hybrid system by batch feeding mode,and has the potential and application prospects.
作者
李鹏程
李美狄
尹庆蓉
毛炜炜
宋春风
LI Pengcheng;LI Meidi;YIN Qingrong;MAO Weiwei;SONG Chunfeng(School of Environmental Science and Engineering,Tianjin University,Tianjin 300072,China)
出处
《洁净煤技术》
CAS
北大核心
2022年第9期69-74,共6页
Clean Coal Technology
基金
国家重点研发计划资助项目(2017YFE0127200)。
关键词
微藻
NH_(4)HCO_(3)
固碳
固氮
耦合系统
化学吸收
microalgae
NH_(4)HCO_(3)
carbon sequestration
nitrogen fixation
coupling system
chemical absorption
