Microecosystem Community Of Bioremediation Technology On Plant Roots And Medium Biofilm In Malodorous Black Water

The rivers play an important role in preventing flooding, adjusting climate, maitainacing landscape ecology and facilating local economy development. However, the city rivers are always regarded as sewage discharge outlets. Especially in Shanghai, a desensely populated and highly industrilized city,the rivers were polluted heavily and thus seasonal or year-round malodorous black occurred. This research aimed to investigate the microbial ecology on the plant roots and the carrier biofilm, discuss the relations between microbial ecology and degradation function in a malodorous black river in Shanghai. The results show that:1) The removal performance of higher fluctuation was observed due to the various influent concentration of contaminants. The biological trough system could change the malodorous black river better. And the plants are beneficial to nitrogen and phosphorus removal. The results show the biological trough system plays an important role in water purification progress. But in winter the purification function weakened obviously.2) ERIC-PCR fingerprinting analysis indicated that the microbial community are extremely rich on the packing materials. But it has a decreasing tendency with decreasing temperature. The interwraping between the roots and packing materials would lead to the decrease in the richness of microbial community because of the well-developed roots of pontederia cordata In winter, the analyses of ERIC-PCR fingerprinting and water quality indicated that the was nearby, these two kinds of microorganisms,corresponding to the DNA fragment length about lOOObp and 2000bp, had great contribution to the removal of BOD.3) ERIC-PCR fingerprinting analysis of biofilm samples in No.6 trough indicated that when both the plants and fillers were in the trough, microbial population in the filler were not completely identical in different depth. But had the same dominant species. Microbial population in the filler in the middle of the trough were richer. Others in the filler at the bottom were least.4) Total 3 phylums, 14 genera, 22 species of phytoplankton were identified totally in autumn experiment. Either acrroding species or biomass, the phytoplankton was primarily composed of diatom. The percentage is separately 82.7% and 82.0%. 4 phylums, 18 genera, 39 species of phytoplankton were identified totally in spring experiment. Acrroding species, the phytoplankton was primarily composed of diatom, the percentage is 82.1%. However, the phytoplankton was primarily composed of cyanobacteria in terms of biomass and the percentage is 60.4%.