| In the past,reeds in the Dongting Lake area were mainly used as raw materials for papermaking.In order to protect the ecological environment of the Dongting Lake basin,it was decided to close the high-polluting papermaking industry.If it is left to rot,it will not only cause serious water pollution problems,but also will not produce economic benefits.Therefore,in order to consume reeds in Dongting Lake and realize the utilization of reed resources,the use of reeds to grow edible fungi has become a brand-new agricultural industry chain.produce.The random dumping and incineration of fungus residues will also cause environmental pollution.How to properly solve the reed fungus residues and realize their resource utilization has become an urgent problem to be solved at present Heavy metals cannot be degraded in nature,and are not easily biodegraded or chemically degraded.They are easily enriched in animals and plants through the food chain and eventually enter the human body.They are highly toxic and seriously threaten the ecological environment,food safety and human health.In the 1990 s,the "Ititai Disease" and "Minamata Disease" that appeared in Japan were caused by excessive heavy metals Cd and Pb.Among soil heavy metal pollution,soil cadmium pollution accounts for the largest proportion,and the effective content of cadmium accounts for a high proportion,which poses a great threat to rice production and ecological security.Therefore,remediation of heavy metal chromium-contaminated soil with reed fungus residue is a promising method to achieve green production and improve soil environment.This paper studies the waste brought by the development of the reed fungi industry,explores the remediation of heavy metal cadmium-contaminated soil with different proportions of reed fungus residues,and its impact on the abundance of soil microbial species,and the recycle of reed fungi for its remediation of heavy metal pollution.Soil provides a theoretical basis.The main research contents are as follows:(1)Based on the microbial community of cadmium-contaminated soil,we isolated and purified a strain of Acidovorax wautersii CXN-1,which can grow in LB solid medium containing 100 mg/m L cadmium ions,named Acidovorax wautersii CXN-1.(2)Investigate the co-adsorption of wastewater containing 20 mg/m L cadmium ions by Acidovorax wautersii CXN-1 and Aphids at different p H.At the 40 th minute,the coadsorption reaches an equilibrium state,and at the initial p H=8,the co-adsorption The removal rate of cadmium ions in the aqueous solution of the group reached 29%,which was about 10% higher than that of the pure bacterial residue group.(3)To explore the changes of cadmium content and cadmium form in soil with different proportions(0.5%,1%,2%)of Bacillus slag addition and its combined application with microorganisms.Under the condition of 2% addition of slag,cadmium The effective state of 15% lower than that of the blank group without addition.(4)Explore and explore the effects of different proportions(0.5%,1%,2%)of Aphids slag addition and its combined application with microorganisms on the cadmium content in roots,stems and leaves of rice plants and their effects on soil microbial species abundance.Influence.Under the condition of 1% addition,the cadmium content in the roots,stems and leaves of rice plants decreased by 5% compared with the non-addition group. |
PDF Full Text Request