Abstract
Aiming at the problem of the low removal efficiency of biological nitrogen-removing of low temperature waste-water, using Polyurethane Porous Gel Carrier (PPGC)-SBMBBR treated low temperature sewage, in compared with conventional SBR,and viaing Miseq high-throughput sequencing technology in analysis of the differences of microbial diversity and abundance of structure on the two reactors of activated sludge, revealed dominant nitrogen-removing bacterium improving the treatment efficiency of low temperature sewage. The results shows that the removal efficiency of the effluent nitrogen and the sludge sedimentation rate of (PPGC)-SBMBBR reactor are significantly improved under the water temperature (6.5±1℃). Adding the filler can contribute to improvement of bacterial diversity and relative abundance of nitrification and denitrification bacterium in the activated sludge system. The main relative abundance of ammonia oxidizing bacteria (AOB),nitrite oxidizing bacteria (NOB),anaerobic denitrifying bacteria, and aerobic denitrifying bacteria in (PPGC)-SBMBBR(R2) are significantly better than SBR (R1),and the R2 reactor can independently enrich the nitrifying bacteria and the aerobic denitrifying bacteria, such as Nitrospira, Hydrogens, Pseudomonas, and Zoogloea. The total relative abundance of dominant and nitrifying denitrifying bacterium increases from 28.65% of R1 to 60.23% of R2, providing a microbiological reference for improving the efficiency of biological nitrogen removal in low temperature waste-water.
Highlights
The adsorption settle-ability of activated sludge process and the growth effect of denitrification bacterium are significantly affected by some factors, such as the low temperature (≤10°C)
Bio-film is often used in low temperature sewage treatments which aim at enriching denitrification bacterium by extending the sludge residence times
Polyurethane Porous Gel Carrier (PPGC) is one kind of polyurethane compoundings with other polymer materials, which has the features of high hydrophilicities, better bacterial attachments
Summary
The adsorption settle-ability of activated sludge process and the growth effect of denitrification bacterium are significantly affected by some factors, such as the low temperature (≤10°C). Bio-film is often used in low temperature sewage treatments which aim at enriching denitrification bacterium by extending the sludge residence times. Polyurethane Porous Gel Carrier (PPGC) is one kind of polyurethane compoundings with other polymer materials, which has the features of high hydrophilicities, better bacterial attachments. It is a kind of new type gel filler suiting to 1-50°C temperature, and the nitrification efficiency can reach 600-1250 gNH3-N/m3·d. The most of researches about bio-film process is limited to improving the effect of biological denitrification of low temperature waste-water by changing factors after adding external fillers [2,3,4], there are few studies on the biological diversity and structural abundance of biological nitrogen-removing in bio-film reactors
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