And then properly increasing liquid upflow velocity could maintain an optimal contact between wastewater and microbial aggregates,expedite efficiently mass transfer,accordingly form a more stable,efficiently microbial structure.
Compared with conventional activated sludge system, the aerobic granule has strong and compact microbial structure, improved stability and higher biomass retention, the process of effluent separating is simple, the structure of the reactor is compact, which can leave out the second settling and refluence device, the occupied area is small;
Compared with conventional activated sludge system, the aerobic granule has strong and compact microbial structure, improved stability and higher biomass retention, the process of effluent separating is simple, the structure of the reactor is compact, which can leave out the second settling and refluence device, the occupied area is small;
Compared with conventional activated sludge system, the aerobic granule has strong and compact microbial structure, improved stability, the process of effluent separating is simple, the occupied area is small, the system can withstand the unfavorable hydraulic effect and toxic substances.
Further research on the community diversity of two different sewage treatment processes was done and initial discussion on the microbial distribution in the same reactor and microbial structure in different experimental conditions was carried out.
However, we did detect significant shifts in microbial structure and function with increases in midge population density.
In order to elucidate changes in the control of C and N cycling along this transect, we analyzed physical and chemical properties of soils and microbial structure and activity in the organic and in the mineral horizons, respectively.
For the first time, it provides an insight into microbial structure within alien marine sponges in the Hawaiian marine ecosystems.
Universal and widespread elements of microbial structure and chemistry are logical targets for assessing microbial burden.
The microbial structure within, between, and over time in decaying cladodes of the common prickly pearOpuntia stricta was studied at each of two separate localities.
This paper reviewed the microbial origins which were responsible for anaerobic biodegradation of chlorinated aromatic compounds. Microbial structures and functions in mixed culture were discussed The applicable fields of reductive dechlorinating microorganisms were also presented
Jointly toxic effects of acetochlor and Cu~(2+) on indigenous bacterial communities in phaeozem were studied using the traditional toxicity assessment methods combined with the modern molecular techniques. It was indicated that acetochlor and Cu~(2+) had a synergic inhibitory effect on the amount of culture-dependent viable bacteria including nitrogen-fixing bacteria, silicate bacteria and phosphorus-mineralization bacteria, as well as the activity of soil dehydrogenase. The increase in the substrate-induced...
Jointly toxic effects of acetochlor and Cu~(2+) on indigenous bacterial communities in phaeozem were studied using the traditional toxicity assessment methods combined with the modern molecular techniques. It was indicated that acetochlor and Cu~(2+) had a synergic inhibitory effect on the amount of culture-dependent viable bacteria including nitrogen-fixing bacteria, silicate bacteria and phosphorus-mineralization bacteria, as well as the activity of soil dehydrogenase. The increase in the substrate-induced respiration (SIR) was significantly promoted by the two pollutants. Analyzing the similarity and the banding patterns by the denaturing gradient gel electrophoresis (DGGE) revealed that the joint toxicity of acetochlor and Cu~(2+) can significantly affect bacterial community structure. Microbial structures of the polluted soils and the clean soil without pesticide application were different, but there was a similarity in microbial structures between the soil with long-term pesticide application and the soil treated simultaneously with acetochlor and Cu~(2+) under the experimental condition, of which the similarity coefficient was up to 74.1%.
It is reported that without cultivation, DNA could be directly extracted from environmental samples with molecular biological methods, such as polymerase chain reaction(PCR) and denaturting gradient gel electrophoresis(DGGE). To analyze the community diversity of activated sludge and bio-film in the municipal sewage, work was done to directly extrude crude DNA from activated sludge and bio-film samples, separate and amplify 16S rDNA by PCR and sequence it with DGGE. The results show the significant microbe community...
It is reported that without cultivation, DNA could be directly extracted from environmental samples with molecular biological methods, such as polymerase chain reaction(PCR) and denaturting gradient gel electrophoresis(DGGE). To analyze the community diversity of activated sludge and bio-film in the municipal sewage, work was done to directly extrude crude DNA from activated sludge and bio-film samples, separate and amplify 16S rDNA by PCR and sequence it with DGGE. The results show the significant microbe community difference between cultivated and uncultivated activated sludge. Further research on the community diversity of two different sewage treatment processes was done and initial discussion on the microbial distribution in the same reactor and microbial structure in different experimental conditions was carried out. The sequences of several 16S rDNA DGGE fragments were determined and some possible bacteria were confirmed in comparision in GeneBank(NCBI). The results show that the PCR-DGGE technology combined with sequences determination is a feasible and efficient method for microorganism analysis in environmental sample.
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微生物群落结构
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