Abstract
In this study, paper-mill wastewater was treated using the Submerged Membrane Bioreactor (SMBR) process. In particular, the ozone oxidation treatment process is applied after SMBR to remove the fluorescent whitening agent, which is a trace pollutant and non-biodegradable. Fluorescent whitening agent concentration was indirectly measured by UV scanning and COD concentration. The concentration of COD before SMBR and ozone oxidation was 449.3 mg/L, and the concentration of treated water was 100.3 mg/ℓ. The COD removal efficiency of paper-mill wastewater through SMBR and the ozone oxidation process was about 77.68%. The optimized amount of ozone was required for the removal of the fluorescent whitening agent after SMBR was 95 mg·O3/ℓ calculated by UV scan results. Additionally, the optimized amount of required ozone to remove COD was calculated to 0.126 mg·COD/mg·O3.
Highlights
In the environmental aspect, when considering the reality that the necessity of acquiring water resource is becoming higher due to the expansion of using water resource in various areas, it is a fact and it is necessary to reuse wastewater that occurs stably in the quantitative aspect
The fluorescent whitening agent of the diaminostilbene disulfonic acid derivative is included in the waste where it was included in the Submerged Membrane Bioreactor (SMBR) bioreactor for operation
The operation condition of the SMBR was MLSS 2.2–4.0 g/L, 25–50 m3 /min for aeration strength, 4.4 h for HRT, 6.6 days for SRT, and 1.5 `/min with differential pressure set to 0.032 bar
Summary
In the environmental aspect, when considering the reality that the necessity of acquiring water resource is becoming higher due to the expansion of using water resource in various areas, it is a fact and it is necessary to reuse wastewater that occurs stably in the quantitative aspect. The pigment and whitening agent have been used widely by being applied to various consumables such as paper, detergent, hygiene products, textile, plastic, and paint [3]. The domestic water-treatment separation membrane technology is applied to sewer and some industrial facilities of village units when compared to the technology in advanced countries. This study applied the submerged membrane bioreactor system to separate the organic matter included in the wastewater, acquired highquality effluent water through the SMBR, and evaluated the water quality characteristic on the SMBR treatment high quality. The decomposition characteristics of fluorescent pigments and the water quality characteristics of the paper-mill wastewater were evaluated by introducing the ozonation process on the effluent water, including the fluorescent whitening agent
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