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Frontiers of Environmental Science & Engineering

Front. Environ. Sci. Eng.    2015, Vol. 9 Issue (6) : 1076-1083
Combined process of biofiltration and ozone oxidation as an advanced treatment process for wastewater reuse
Xinwei LI1,2,Hanchang SHI1,*(),Kuixiao LI2,Liang ZHANG2
1. School of Environment, Tsinghua University, Beijing 100084, China
2. Beijing Drainage Group Co. Ltd., Beijing 100044, China
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The effluent of a wastewater treatment plant was treated in a pilot plant for reclaimed water production through the denitrification biofilter (DNBF) process, ozonation (O3), and biologic aerated filtration (BAF). The combined process demonstrated good removal performance of conventional pollutants, including concentrations of chemical oxygen demand (27.8 mg·L−1) and total nitrogen (9.9 mg·L−1) in the final effluent, which met the local discharge standards and water reuse purposes. Micropollutants (e.g., antibiotics and endocrine-disrupting chemicals) were also significantly removed during the proposed process. Ozonation exhibited high antibiotic removal efficiencies, especially for tetracycline (94%). However, micropollutant removal efficiency was negatively affected by the nitrite produced by DNBF. Acute toxicity variations of the combined process were estimated by utilizing luminescent bacteria. Inhibition rate increased from 9% to 15% during ozonation. Carbonyl compound concentrations (e.g., aldehydes and ketones) also increased by 58% as by-products, which consequently increased toxicity. However, toxicity eventually became as low as that of the influent because the by-products were effectively removed by BAF. The combined DNBF/O3/BAF process is suitable for the advanced treatment of reclaimed water because it can thoroughly remove pollutants and toxicity.

Keywords wastewater treatment      micropollutant removal      ozonation      biofiltration      toxicity     
Corresponding Author(s): Hanchang SHI   
Online First Date: 08 January 2015    Issue Date: 23 November 2015
 Cite this article:   
Xinwei LI,Hanchang SHI,Kuixiao LI, et al. Combined process of biofiltration and ozone oxidation as an advanced treatment process for wastewater reuse[J]. Front. Environ. Sci. Eng., 2015, 9(6): 1076-1083.
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Xinwei LI
Hanchang SHI
Kuixiao LI
parameters /(mg·L−1) COD TOC TN N H 4 + -N N O 2 -N N O 3 -N TP SS
secondary effluent 30–40 8–11 25–30 0.3–1.5 0–0.3 22–28 0.3–0.5 8–12
reuse standards as scenic water 15 5 0.5 10
local discharge standards 30 15 1.5 0.3 5
Tab.1  Secondary effluents quality of Gaobeidian WWTP and standards for discharge and scenic environment reuse
Fig.1  Process of the advanced wastewater treatment
Fig.2  Variations of COD and TOC during advanced treatment (SE: secondary effluent, DNBF-IN: influent of DNBF, DNBF-E: effluent of DNBF, O3-E: effluent of ozonation, BAF-E: effluent of BAF)
Fig.3  Variations of nitrogen compounds during advanced treatment
Fig.4  Concentrations of antibiotics in each unit of advanced treatment
Fig.5  Concentrations of EDCs in each unit of advanced treatment
Fig.6  Variations of inhibition rate on V. fischeri and concentration of carbonyl compounds
Fig.7  Antibiotics removal efficiency under different ozone dosage
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