Study On The Adsorption And Transportation Of Preponderant Bacteria In The Composting Medium

The microorganism is the key factor of the composting progress. The composting efficiency is connected to microorganism's degradability. The objective of composting progress is utilizing microorganism to enhance the transformation of biodegradable organic matter to steady humus. It is obvious that microorganism plays an important part in the composting progress. The research of biodegradation of organic matter in compost by microorganism is always being the researchful hotspot at home and abroad. Many study on additive preponderant bacteria in compost was reported.The composting system is a complex system. At the course of composting, some dominant bacteria are often appended in order to improve the efficiency of composting. For the implementation of in situ bioremediation, the bacteria must be capable of moving or being transported to the site of contamination. Therefore, it is significative to find some useful methods of enhancing bacterial transport through composting medium.According to the background upwards, column experiments were preformed to study the effect of rhamnolipid excreted by a Pseudomonas aeruginosa strain and the content of humic substances in composting medium on the bacterial adsorption and transportation of preponderant bacteria in composting granule medium.Rhamnolipid has been widely applied to the soil recovery for its special molecular structure. Many research reported that rhamnolipid with certain concentrations could reduce the bacterial adsorption on the surface of porous media, enhance bacterial transportation in porous media. In this paper, the influence of an anionic biosurfactant rhamnolipid (RL) on the adsorption and transportation of the bacterial strain pseudomonas aeruginosa through the composting medium was investigated.Experimental results indicated that RL with certain concentrations could impede bacterial sorption to composting granules and enhance the bacterial transport in composting medium. It was suggested that the reasons might be that RL adsorbed on the bacterial surface changed the surface characteristics of the bacteria and composting granules and produced steric effect, which reduced the affinity between the bacteria and composting granules.Similar with surfactant, humic substance is macromolecular organic matter with amphiphilic structures. In the composting progress, the content of humic substance is continuously variational. It is meaningful to study the effect of the humic substances...