| Acid Rose Red B is one of the bio-refractory organic dyes, and its long-term existence exerts great harm on the environment. Traditional biochemical treatment method is difficult to achieve the ideal treatment result, moreover, the treatment cost is expensive and operation is difficulty too. Ozone (O3)-biological aerated filters (BAF) technology is a feasible method for the treatment of nonbio-degradable wastewater to enhance its biodegrability. At present, in terms of ozone-biochemical process, it is widely reported at home and abroad that ozonization oxidation and biological treatment are realized in two reactors, or one reactor is divided into internal cylinder and external cylinder to realize ozone oxidation and biochemical treatment (its essence is equivalent to two reactors), but little is reported about the utilization of ozone oxidation and biological aerated filters in one reaction system. This paper mainly researches on the degradation mechanism of pollutants in an O3-BAF integration system, as well as the micro-biological phase in the BAF reactor, meanwhile, the treatment effect of the integration system is compared with separate ozone oxidation and biological aerated filters, respectively.In this paper covers the quantitative comparison of the integration system and the division system in terms of treatment efficiency of Acid Rose Red B. The results indicate that the integration system displays excellent removal efficiency of chromaticity and COD from acidic simulated wastewater containing Acid Rose Red B, at the O3 dosage of 58.4 mg/L, retention time of 4 h and gas water ratio of 4:1, the removal efficiency of chromaticity and COD can achieve 92% and 60%, respectively. In consideration of the treatment performance, treatment cost and capital cost, the integration system of O3 and BAF is superior to the division system of them. The integrated O3-BAF system has simple process, takes up small space, consumes low operation cost; meanwhile, O3 oxidation provides oxygen source for the subsequent BAF reactor, which saves oxygen, and the carriers of BAF provides catalytic carrier for O3 oxidation process. Also, from the perspective of technical application, one reactor can reduce investment and operation cost, displaying strong engineering practicability.The kinetic analysis of the reaction between ozone and organics indicated that with the increasing of the initial dye concentration, the rate constant decrease, the initial pH higher, the rate constant lower. For the affection of pH, after analysis, this paper bring forward the following explanation:the especial structure in the dye result in more effective when the oxidation decolorization process carry through acid circumstance.In this paper, an experiential model about biodegradation kinetics was established on the basic of the organic concentration and the reactor height. Assuming the integration ozone-biological aerated filters was an ideal plug flow reactor, it could be infered that the organics remove kinetic model was Se=Soexp(mh), S=Soexp(-4.86Q-1.3157h) if considering different inflow, or S=S0exp[(-2.21×10-4c2-0.0228)h] considering different ozone concentration. This model would be useful for the water with stable temperature and pH value.Both integrated system and division system were great affected by nutrition substrate concentration. The biomass near the inlet with organic concentration was great, while it was less near the outlet with low organic concentration. Comparing biomass and bioactivity in the BAF column of the intergrated system and the separate system, it could be found that both biomass and bioactivity of the intergrated system were higher than the division system. It is further testified that the intergrated system was superior to the separate system. |
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