Papers by Keyword: Sequencing Batch Reactor (SBR)

Abstract: The influences of HRT, C/N ratio on simultaneous nitrification and denitrification (SND) and the rule of pH in a sequencing batch reactor (SBR) were investigated while treating low C/N synthetic municipal wastewater. The results showed that the function of SND became more outstanding and the removal rate of TN, NH₄⁺-N was improved greatly by lengthening HRT appropriately; when the C/N increased, the denitrification effect of the simultaneous nitrification and denitrification would be improved; .At the same time, the variation of pH value was well related to ammonia oxidation. So that judgment on the ending of nitrification and denitrification could be based on the inflection point on the varied curve of pH, and thus reducing aeration and mixing time for the purpose of energy saving.

Abstract: N, N-diamino-N-octadecyl-N-trimethyl ammonium chloride were used as an intercalation agent to treat Na⁺-montmorillonite and for forming a kind of OMMT. OMMT was analyzed by fourier transform infrared spectroscopy (FTIR) and wide angle X-ray diffraction (XRD). Novel polybutadiene styrene rubber (SBR)/organic montmorillonite (OMMT) composites were prepared by SBR and OMMT. Properties such as cure characteristic, tensile strength, elongation at break, abrasion loss and thermal properties were researched and compared. Results showed that SBR/OMMT-10% composite had the best tensile properties.

Abstract: In this study, a sequencing batch reactor (SBR) was used to treat synthetic wastewater when dissolved oxygen (DO) concentration and temperature were 0.5-1.0mg/L and 30±1°C, respectively. Effect of sludge loading(Ns) on simultaneous nitrification and denitrification (SND) was investigated. The results indicated that removal efficiencies of ammonia nitrogen (NH₄⁺-N), COD and total nitrogen (TN) were all higher than 90%, respectively, when influent NH₄⁺-N and Ns were 35-45mg/L, 0.15kgCOD/(kgMLSS•d) under 7 hours of aeration time and 1 hour of idle time, respectively. Therefore, the SBR has obviously achieved simultaneous nitrification and denitrification.

Abstract: The effect s of aeration time on the treatment of brewery wastewater in SBR reactor were investigated by using synthetic brewery wastewater. The experimental result indicates that under the condition of influent COD is 300～650mg/L, the temperature is 25°C, continual aerations is 2.5 h and sludge density is 2000～3000 mg/L, the reactor has a good degeneration ability of COD and NH4+-N in simulation brewery wastewater，removal rate can reached 90 % or more，phosphate removal efficiency was above 70%. so the SBR technology is feasible．

Abstract: In order to investigate the effect of MLSS on the denitrifying dephosphorization process, a lab experiment was carried out by using an anaerobic/anoxic sequencing batch reactor (A2SBR) for a long time. The results showed that when MLSS was maintained at 2500-3500mg/L, removal efficiency of PO43--P was kept high value and it was higher than 90%.

Abstract: A Company of YunNan, located at the basin of the Jinsha river, is a plant producing beer. The amount of its wastewater comes up to 1000 m3/ d, and Parameters of the influent are CODcr=1850mg/L, BOD5=600mg/L, SS=700mg/ L. The quality of effluent has been up to the gradeⅠof the discharge standard of GB8978-1996 by applying the treatment technology of two phase-anaerobic-SBR process. This technology enjoys both low investment and low operation cost.The beer wastewater has characteristics of high organic matter content, well bio-chemical and asymmetry exhaust. We carry on the craft choices and designs by researching the current treatments of beer wastewater and combining the technique development of related realms of internal and external while considering the special of the company.

Abstract: The relationships between the mechanical properties of modified concrete and the composition of latex blend were studied. Influence of steel fiber and polypropylene fiber on performance of modified concrete was analyzed on that basis. The results indicate that the contradiction between the strength and the damping property of normal concrete will be relieved to some degree by controlling the proportion of latex blend. The adding of fiber can modify the damping property of concrete, while it has a little effects on the compressive strength and elastic modulus of concrete.

Abstract: Styrene-Butadiene-Rubber (SBR) modified bitumen had improved properties in softening points, ductility, and aging resistance. It is due to variation of molecular weight (MW) and molecular weight distribution (MWD) of the product made during the blending between SBR and bitumen. Gel permeation chromatography (GPC) analytical results indicated interaction in polymer blends that bitumen macromolecular chain biting and chemical forces as well as intermolecular recombination formed new bitumen polymer blends.

Abstract: Attapulgite (AT)/natural rubber (NR)/ styrene-butadiene rubber (SBR) nanocomposites have been prepared after attapulgite was modified by different coupling agent. The treatment of AT caused the adhesion between AT nanorods and the nature rubber/styrene-butadiene rubber was improved, which enhanced the tensile properties of the matrix. The tensile strength of composites attained 15.6 MPa after AT was modified by 3%wt Si-69 coupling with addition of 20 phr.

Abstract: In this paper, Polymer Plus of Aspen Tech Inc. is used to establish a styrene-butadiene rubber (SBR) polymerization process model; the sensitivity analysis method is used to analyze concentration of the initiator, reaction temperature and other factors which influence production and molecular weight of product. It is concluded that increasing amount of initiator can improve production, while the molecular weight would increase at first and then decline; and along with the increasing temperature, weight-average molecular weight would lower and production of polymer PBS would increase; molecular weight of polymer and production of polymer would magnify along with increase of amount of emulsifier and volume of the reactor.