| The existence of dyes in printing and dyeing wastewater can increase the chroma and COD, such as a large number of synthetic dyes, which can result in many potential hazards for the whole biological environment. Sulfate radical-based advanced oxidation technology shows a great rate of removing dye from wastewater, which can also bring a lot of problems during the treatment. However, advanced oxidation techniques usually require some additional conditions, short catalyst’s half-life, and more toxic byproducts may be produced in the degradation process. Due to its high specific surface, nano-manganese oxide octahedral molecular sieve can be easily reunited in the water and settlement occurs under the action of gravity. Meanwhile as natural polymer, chitosan would be widely used in food, chemical, environmental protection and other industries, because of its non-toxic, harmless and biodegradability, good film characteristics. In this study, the two kinds of particles, core-shell structured chitosan microspheres@OMS-2(CSCM)and the magnetic manganese oxide octahedral molecular sieve(Fe3O4@OMS-2),were produced and used to deal with the simulated X-3B wastewater, coupling with SBR. Its main contents are as follows:(1) Combining of the prepared magnetic OMS-2 and Sequencing Batch Reactor to investigate the influences of PH value, concentration of magnetic OMS-2 and X-3B dye concentration on the entire processing system.The result showed that PH=6~7, CX-3B=50mg/L,Cmagnetic OMS-2=CPMS= 0.25g/L was the most optimum conditions, Meanwhile, it also could help us to explore mechanism on the performance.(2) Using inverse-phase suspension crosslinking method to synthetic particles(size 20um-50um) core-shell structured chitosan microspheres@OMS-2(CSCM), and combining it with Sequencing Batch Reactor, the whole process was to explore the optimal reaction condition(PH = 6 ~ 7, CX-3B = 100 mg / L, CCSCM = 1.0g / L, CPS = 0.25 g / L).(3) Coupling CSCM with aerobic activated sludge one month later, we found that the strength, superparamagnetic strength and crystallinity of the particles were stable.Test the concentration of iron and manganese ions, we found at the initial time, concentration of iron ions were highest,and then can decrease gradually;different concentration of CSCM(0.125 g / L, 0.25 g / L, 0.50 g / L and 1.0g / L)in the solution, Fe ion concentration to render decreased significantly(reaction 24h), and then a relatively flat trend(reaction 48h), but the concentration of 0.0625 g/L solution of the Fe ion concentration- the first fall flat(reaction 24h), after a relatively clear trend(reaction 48h); reaction 120 h after the water has been undetectable; each solution in the Mn ion concentration increased at first(reaction 24 h to 48h), and then continue to rise to the highest point(reactions 120h), then gradually decreased(reaction 240h), and finally stabilized(reaction 600 h to 720h).(4) Screening five dominant bacteria in the aerobic activated sludge, YY1 and YY5 were CSCM used before, YYB1,YYB2, YYB3 were used after. Testing their 16 S rDNA sequence, and analyzing them in BLAST program, draw phylogenetic trees of five dominant strains, we found YY1 has a 99% homologous sequence similarity with Bacillus thuringiensis and Bacillus sp PMO, YY5 has a 99% homologous sequence similarity with Escherichia coli, YYB1 has a 99% homologous sequence similarity with Rhodococcus sp, and YYB2 has a 99% homologous sequence similarity with Bacillus aryabhattal partial and Bacillus megaterium Q3 plasmid p1, YYB3 has a 99% homologous sequence similarity with Alcaligenes faecalis. |
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