Characterization of dissolved organic matter in landfill leachate during the combined treatment process of air stripping, Fenton, SBR and coagulation

Journal Article · Wed Jul 15 04:00:00 EDT 2015 · Waste Management

DOI:https://doi.org/10.1016/J.WASMAN.2015.03.044· OSTI ID:22472525

Liu, ZhiPing ^[1]; Wu, WenHui; Shi, Ping ^[2]; Guo, JinSong ^[3]; Cheng, Jin ^[2]

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1. Key Laboratory of Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045 (China)
2. Faculty of Urban Construction and Environmental Engineering, Chongqing University, Chongqing 400020 (China)
3. Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400045 (China)

Highlights: • DOM fractions spectra analysis during the whole treatment process. • Efficient method was achieved to remove organic matters in landfill leachate. • Molecular weight distribution and fractions were discussed. - Abstract: A combined treatment process of air stripping + Fenton + sequencing batch reactor (SBR)+ coagulation was performed to remove the pollutants in landfill leachate. Molecular weight (MW) distribution and fractions of dissolved organic matter (DOM) were discussed to study the characteristics. The experiment showed that the removal rate of chemical oxygen demand (COD), five day biological oxygen demand (BOD{sub 5}) and ammonia nitrogen (NH{sub 3}−N) by the combined process were 92.8%, 87.8% and 98.0%, respectively. Humic acid (HA) and fulvic acid (FA) were the main fractions in raw leachate with 81.8% of the total COD concentration, while hydrophilic organic matter (HyI) was the dominant fraction in the final effluent of the combined process with 63.5% of the total COD concentration. After the combined treatment process, the removal rate of DOM and fractions HA, FA, HyI were 91.9%, 97.1%, 95.8% and 71.7%, respectively. Organic matters of MW < 2 k and MW > 100 k were removed with 90.5% and 97.9% COD concentration after the treatment. The ultraviolet–visible spectra (UV–vis), Fourier transform infrared spectra (FTIR) and three-dimensional excitation-emission matrices spectra (EEMs) indicated that benzene materials and phenol compounds were preferentially removed in air stripping. High MW matters, aromatic rings, conjugated moieties and some functional groups were mainly removed by Fenton. While small MW fractions, carboxylic acids, alcohols and protein-like materials were preferentially biodegraded via SBR. Fulvic-like and humic-like materials were mainly destroyed via Fenton oxidation and coagulation.

• OSTI ID: 22472525
• Journal Information: Waste Management, Journal Name: Waste Management Vol. 41; ISSN WAMAE2; ISSN 0956-053X
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ALCOHOLS
AMMONIA
BENZENE
BIODEGRADATION
CARBOXYLIC ACIDS
CHEMICAL OXYGEN DEMAND
CONCENTRATION RATIO
FOURIER TRANSFORM SPECTROMETERS
FULVIC ACIDS
HUMIC ACIDS
INFRARED SPECTRA
LEACHATES
MOLECULAR WEIGHT
NITROGEN
POLLUTANTS
ULTRAVIOLET SPECTRA
VISIBLE SPECTRA