Preparation of Different Activated Sludge Immobilized Carriers and Their Organic Wastewater Treatment Performance by Microbial Community

摘要

Immobilized microbial degradation technology has the advantages of simple solid-liquid separation, strong toxicity resistance, and low sludge yield. The innovation of this study was based on the modification and biofilm formation of pine barks and corn straws to prepare the high-efficiency and low-cost activated sludge immobilized materials and also compare with the commonly used immobilized carriers, including the sodium alginate and agar immobilized pellets. Results showed that the best immobilization carrier was modified bark. The degradation of organic components in wastewater by microorganisms on immobilized carriers was verified with a scanning electron microscope and microorganism community detection. After modification the fiber structure of natural material was broken to a certain extent for bacterial attachment. The high-throughput sequencing of immobilized microorganism community and sludge microorganism community showed the main species in the samples were Proteus bacteria and Bacteroides. Firmicutes and Chloroflexi also occupied a part of the mixed consortium, but other species such as Crenarchaeota was fewer. The content of the same bacteria in straw, bark, and sludge samples was different.