Research on the Effects of Sewage Discharge from Chemical Industry Park on Microbial Community

Abstract

To analyze structure change of microbial communities in a sewage system of a typical coastal industrial park and a drainage area, by comparing structures of microbial communities in the sewage treatment system in the park and the pollutant-holding area by means of molecular biology, higher richness and diversity of bacteria and archaea in sediments in the pollutant-holding area than that of the sewage treatment system in the park are found in this research; according to analysis and findings on different points and different seasonal samples in the pollutant-holding area, microbial community structures at each point in the pollutant-holding area share relatively high similarity. Sediments have higher bacterial community structure diversity than water body, but their diversity of archaeal community structure is similar. Conclusion are drawn through experiments as follows: AOA and AOB sediments have higher activity under relatively lower (<0.1mg/L) and higher (>2mg/L) concentration of ammonia nitrogen; ammonia oxidation capacity in the sediments is increased during the process where the temperature rises from 5°C to 35°C; increase of salinity can make the activity of AOA improve and make it become the main ammonia oxidization bacteria flora.