化工进展2017，Vol.36Issue(4)：1512-1520,9.DOI:10.16085/j.issn.1000-6613.2017.04.047
外源吸收剂对沼液CO2吸收及农业应用的影响
Effect of exogenous absorbents addition on CO2 absorption performance of biogas slurry and its agricultural application
摘要
Abstract
Biogas slurry is the byproduct of biogas produced by anaerobic fermentation of biomass, which is weak alkaline and rich in useful ingredients stimulating the plant growth. Theoretically,biogas slurry can be used as a renewable absorbent combining CO2 absorption and CO2 biological fixation. But CO2 absorption performance of biogas slurry needs to be enhanced. Adding exogenous CO2 absorbents into biogas slurry can contribute to promoting CO2 absorption performance of biogas slurry,but also affect its phytotoxicity. So,the effects of 6 exogenous CO2 absorbents added into biogas slurry on CO2 absorption performance of biogas slurry were investigated using the typical CO2 bubbling absorption system. Additionally,the feasibility of agricultural application of CO2-rich biogas slurry was also explored in terms of the change of phytotoxicity and total phosphorus concentration before and after adding exogenous CO2 absorbents. The results showed that ammonia nitrogen,the main harmful substance in the biogas slurry,could be removed by concentrating biogas slurry at vacuum conditions. And the removal efficiency of ammonia nitrogen could reach up to about 87.69% when the biogas slurry concentration was increased by 5 times. Compared with adding absorbents into the raw biogas slurry directly,adding the same absorbents with high concentrations into the concentrated biogas slurry could greatly improve the CO2absorption capacity. In addition,when the concentrated CO2-rich biogas slurry was diluted so that the concentration of CO2 absorbent concentration was equal to that of the raw biogas slurry,the germination index(GI)of Chinese cabbage treated by the concentrated CO2-rich slurry was higher than that treated by raw biogas slurry. Moreover,adding exogenous absorbents in biogas slurry can help remove the total phosphorus in biogas slurry,which reduces the environmental hazards for agricultural applications. Among all of 6 exogenous absorbents,MEA has the comprehensive advantages in terms of improving CO2 absorption performance and reducing the phytotoxicity of biogas slurry.关键词
沼液/可再生吸收剂/厌氧发酵/减压浓缩/二氧化碳捕集/植物生理毒性Key words
biogas slurry/renewable absorbent/anaerobic digestion/vacuum concentration/CO2 capture/phytotoxicity分类
农业科技引用本文复制引用
王文超,贺清尧,余歌,刘璐,晏水平..外源吸收剂对沼液CO2吸收及农业应用的影响[J].化工进展,2017,36(4):1512-1520,9.基金项目
国家自然科学基金项目(51376078). （51376078）
