Sustainable agricultural development is a topic of global concern aiming at satisfying food demand of the growing population while reducing impact on environment.Circular agriculture has become a promising development...Sustainable agricultural development is a topic of global concern aiming at satisfying food demand of the growing population while reducing impact on environment.Circular agriculture has become a promising development pattern with the advantages of complementing environmental resources,replacing feedback from outside system,and processing waste of bottom of system,etc.This study combined economic analysis,life cycle assessment and emergy accounting to evaluate sustainability of an integrated maize-pig system(IS)driven by indigenous microbes in Northeast China,compared with separated maize and pig system(SS).IS reduced input of concentrate feed,coal,vaccines,disinfectants,fertilizer and labor by 14.35%,100%,46.11%,100%,60.1%and 60.8%driven by indigenous microbes.Economic analysis results showed that IS has 82.88%higher profit than that of SS.The sum of potential environmental impacts of IS was lower than SS for 80.65%according to lifecycle assessment.The emergy results revealed that IS performed better sustainability.Internal feedback emergy for fertilizer and local resources for maize straw increasing of IS significantly improved emergy efficiency.The reduction resulted in nonrenewable resources decreased 33.01%than that of SS,and increased renewable resources by 67.81%,which reduced environmental load ratio of IS by 60.08%of IS.Meanwhile,these factors were the primary factors generating higher sustainability of IS.Overall,the integrated maize-pig system driven by indigenous microbes in this study can effectively alleviate the problems caused by agricultural waste and promote sustainable agricultural development.展开更多
Nitrogen-containing organic pollutants(quinoline,pyridine and indole)are widely distributed in coking wastewater,and bioaugmentation with specific microorganisms may enhance the removal of these recalcitrant pollutant...Nitrogen-containing organic pollutants(quinoline,pyridine and indole)are widely distributed in coking wastewater,and bioaugmentation with specific microorganisms may enhance the removal of these recalcitrant pollutants.The bioaugmented system(group B)was constructed through inoculation of two aromatics-degrading bacteria,Comamonas sp.Z1(quinoline degrader)and Acinetobacter sp.JW(indole degrader),into the activated sludge for treatment of quinoline,indole and pyridine,and the non-bioaugmented activated sludge was used as the control(group C).Both groups maintained high efficiencies(>94%)for removal of nitrogen-containing organic pollutants and chemical oxygen demand(COD)during the long-term operation,and group B was highly effective at the starting period and the operation stage fed with raw wastewater.High-throughput sequencing analysis indicated that nitrogen-containing organic pollutants could shape the microbial community structure,and communities of bioaugmented group B were clearly separated from those of non-bioaugmented group C as observed in non-metric multidimensional scaling(NMDS)plot.Although the inoculants did not remain their dominance in group B,bioaugmentation could induce the formation of effective microbial community,and the indigenous microbes might play the key role in removal of nitrogen-containing organic pollutants,including Dokdonella,Comamonas and Pseudoxanthomonas.Phylogenetic Investigation of Communities by Reconstruction of Unobserved States(PICRUSt)analysis suggested that bioaugmentation could facilitate the enrichment of functional genes related to xenobiotics biodegradation and metabolism,probably leading to the improved performance in group B.This study indicated that bioaugmentation could promote the removal of nitrogen-containing organic pollutants,which should be an effective strategy for wastewater treatment.展开更多
基金This work was supported by the Chinese Universities Scientific Fund[2021AC002].
文摘Sustainable agricultural development is a topic of global concern aiming at satisfying food demand of the growing population while reducing impact on environment.Circular agriculture has become a promising development pattern with the advantages of complementing environmental resources,replacing feedback from outside system,and processing waste of bottom of system,etc.This study combined economic analysis,life cycle assessment and emergy accounting to evaluate sustainability of an integrated maize-pig system(IS)driven by indigenous microbes in Northeast China,compared with separated maize and pig system(SS).IS reduced input of concentrate feed,coal,vaccines,disinfectants,fertilizer and labor by 14.35%,100%,46.11%,100%,60.1%and 60.8%driven by indigenous microbes.Economic analysis results showed that IS has 82.88%higher profit than that of SS.The sum of potential environmental impacts of IS was lower than SS for 80.65%according to lifecycle assessment.The emergy results revealed that IS performed better sustainability.Internal feedback emergy for fertilizer and local resources for maize straw increasing of IS significantly improved emergy efficiency.The reduction resulted in nonrenewable resources decreased 33.01%than that of SS,and increased renewable resources by 67.81%,which reduced environmental load ratio of IS by 60.08%of IS.Meanwhile,these factors were the primary factors generating higher sustainability of IS.Overall,the integrated maize-pig system driven by indigenous microbes in this study can effectively alleviate the problems caused by agricultural waste and promote sustainable agricultural development.
基金supported by the National Natural Science Foundation of China(Nos.31970107 and 51508068)the Fundamental Research Funds for the Central Universities(No.DUT19JC17)the Open Project of State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology(No.QAK201943)。
文摘Nitrogen-containing organic pollutants(quinoline,pyridine and indole)are widely distributed in coking wastewater,and bioaugmentation with specific microorganisms may enhance the removal of these recalcitrant pollutants.The bioaugmented system(group B)was constructed through inoculation of two aromatics-degrading bacteria,Comamonas sp.Z1(quinoline degrader)and Acinetobacter sp.JW(indole degrader),into the activated sludge for treatment of quinoline,indole and pyridine,and the non-bioaugmented activated sludge was used as the control(group C).Both groups maintained high efficiencies(>94%)for removal of nitrogen-containing organic pollutants and chemical oxygen demand(COD)during the long-term operation,and group B was highly effective at the starting period and the operation stage fed with raw wastewater.High-throughput sequencing analysis indicated that nitrogen-containing organic pollutants could shape the microbial community structure,and communities of bioaugmented group B were clearly separated from those of non-bioaugmented group C as observed in non-metric multidimensional scaling(NMDS)plot.Although the inoculants did not remain their dominance in group B,bioaugmentation could induce the formation of effective microbial community,and the indigenous microbes might play the key role in removal of nitrogen-containing organic pollutants,including Dokdonella,Comamonas and Pseudoxanthomonas.Phylogenetic Investigation of Communities by Reconstruction of Unobserved States(PICRUSt)analysis suggested that bioaugmentation could facilitate the enrichment of functional genes related to xenobiotics biodegradation and metabolism,probably leading to the improved performance in group B.This study indicated that bioaugmentation could promote the removal of nitrogen-containing organic pollutants,which should be an effective strategy for wastewater treatment.
