Preliminary Studies On The Optimization Technique Of Microecosystem In Biodegradation Processes

Based on the theory of microorganism ecology, the application researches on optimization of the biodegradation micro-ecosystem were conducted by use of environmental biotechnology and biodegradation technology in this paper. The theoretical basis of optimizing biodegradation micro-ecosystem was formed though the theoretical analyses of micro-ecosystem .After enrichment incubation experiments of complex bacterium, effects of the optimization of water body micro-ecosystem on the improvement of water bioremediation were also studied. Though the influence experiments of complex bacterium on normal biodegradation micro-ecosystem, the methods of micro-ecosystem optimization and establishment as well as application techniques of biodegradation micro-ecosystem optimization were studied by use of compound bacterium. The main conclusions were summarized as follows:(l)The micro-ecosystem optimization in the biodegradation process had an important function on promoting biodegradation technology .Adding extraneous complex bacterium and utilizing the reactor's bio-selection were the key measure of optimizing the biodegradation micro-ecosystem .(2) The enteric microorganisms could adjust mutual effects between species and community of microorganisms in the biological degradation micro-ecosystem on one hand , and increase the microorganism concentration and its metabolism activity on the other hand. From which the target of optimizing micro-ecosystem is reached.(3)The enrichment incubation of complex bacterium by selecting culture medium could receive the enrichment incubation liquid with different dominant microbes and raise microbial metabolic activity and its adaptability to environment. The effect of compound bacterium enrichment culture is affected by carbon and nitrogen form in the culture media, constitute and concentration of culture media, anaerobic and aerobic environment, PH and inoculum's concentration of bacterium.(4)After different enrichment incubation, compound bacterium have some facilitation to biodegradation of polluted water. In those, compound culture media have the best effect of biodegradation Renovation function of bacterium to water body is affected by enrichment incubation ways of compound bacterium, organic matter concentration of environmental water and dissolved oxygen concentration. In the other hand, it explains influence of water micro-ecosystem to water-body succession.(5) The co-operation of compound bacterium and activated sludge could raise biodegradation of system and its biodegradation matched first-order dynamical reaction equation. Compound bacterium had the effect of optimization to activated sludge micro-ecosystem. Compared to introduction-culture sludge, compound bacterium co-culture sludge improved co-acieration, sedimentation of sludge, increased biological activity of sludge and system's resistance ability to impact load.(6) In the system of bio-film, micro-ecology of bio-film was more stable than activated sludge's after introduction-culture and co-operation compound bacterium. And applying of co-operation bio-film of compound bacterium, the stability of biodegradation in the system have improved.(7) Combined with bio-selection characteristic of SBR and characteristic of bio-membrane micro-ecosystem, SBR membrane biodegradation reactor constructed by co-culture with compound bacterium had optimized biodegradation micro-ecosystem, strengthened biodegradation capacity. The results showed that concentration of NO3-N, NH3-N, P, COD in out-water in the system had increased apparently with the values of 0.56mg/l, 1.30mg/, 0.18mg/l and 46.0mg/l compared to control sample with the values of 2.01mg/l, 1.70mg/, 0.52mg/l and 120.5mg/l.