Research on In-depth Treatment Efficacy of Reclaimed Water with Heterogeneous Catalytic Ozonation

Abstract

The secondary biological effluent of a sewage treatment plant in Beijing City is treated deeply with heterogeneous catalytic ozonation and the efficacy is evaluated. The results indicate that the organic degradation efficacy in the effluent after heterogeneous catalytic ozonation increases along with the ozone dosage, but the ozone utilization ratio decreases along with the ozone dosage. Through the research of residual ozone concentration in the reactor friction, the catalyzer is added in the section between 30cm and 80cm far from the aeration device, and it can effectively promote ozone utilization ratio while further strengthening organic degradation efficacy. The results indicate that when the ozone dosage is 15mg/L, SCOD, UV254 and DOC in the effluent may be decreased to 6.74 mg/L, 0.0361 cm-1 and 5.85 mg/L respectively through catalytic ozonation of heterogeneous catalyzer A (aluminum silicon alloy). Meanwhile, the ozone utilization ratio is increased from 84.76% (when only ozone is oxidized) to 94.2%. Three-dimensional fluorescence analysis results indicate that macromolecules such as protein and humus in the effluent may be well removed. The reclaimed water after in-depth treatment reaches higher water quality standard, the applicable scenarios are greatly increased, and the water quality problem of reclaimed water can be effectively solved during reuse.