Effects of hydraulic retention time, co-substrate and nitrogen source on laundry wastewater anionic surfactant degradation in fluidized bed reactors

• Published in: Bioresource technology Vol. 224; pp. 246 - 254
• Main Authors: Andrade, Marcus Vinicius Freire, Sakamoto, Isabel Kimiko, Corbi, Juliano José, Silva, Edson Luiz, Varesche, Maria Bernadete Amâncio
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.01.2017
• Subjects: Alkanesulfonic Acids - chemistry; Alkanesulfonic Acids - isolation & purification; Alkanesulfonic Acids - metabolism; Bacteria - metabolism; Biodegradation, Environmental; Bioreactors - microbiology; Ecotoxicology - methods; Equipment Design; Ethanol; LAS degradation; Microbial Consortia - genetics; Microbial Consortia - physiology; Microbial diversity; Nitrate; Nitrogen - metabolism; Surface-Active Agents - chemistry; Surface-Active Agents - isolation & purification; Surface-Active Agents - metabolism; Toxicity; Waste Disposal, Fluid - instrumentation; Waste Disposal, Fluid - methods; Waste Water - chemistry; Water Pollutants, Chemical - chemistry; Water Pollutants, Chemical - isolation & purification; Water Pollutants, Chemical - metabolism; Microbial diversity; Nitrate; LAS degradation; Ethanol; Toxicity
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2016.11.001

•The FBRs were operated in short hydraulic retention time.•Nitrate addition affected LAS removal on FBR operated in shorter HRT.•There was significant toxicity decrease on effluent toward the macro-invertebrate.•Some genera related to LAS degradation were identified in both reactors. The aim of this study was to evaluate the influence of hydraulic retention time (HRT) on linear alkylbenzene sulfonate (LAS) removal in fluidized bed reactors (FBRs). FBR1 (HRT of 8h) and FBR2 (HRT of 12h) were fed laundry wastewater with 18.6±4.1 to 27.1±5.6mg/L of LAS in the following conditions: ethanol and nitrate addition (Phases I, II and III), nitrate (Phase IV), ethanol (Phase V) and laundry wastewater (Phase VI). LAS removal was 93±12% (FBR1) and 99±2% (FBR2). In FBR1, nitrate influenced significantly on LAS removal (99±3% – Phase IV) compared to the phase without nitrate (90±15% – Phase V). In FBR1 the absence of ethanol was more favourable for LAS removal (99±3% – Phase IV) compared to ethanol addition (87±16% – Phase II). In FBR2, 99±2% LAS removal was found up to 436days. By microbial characterization were identified bacteria as Acinetobacter, Dechloromonas, Pseudomonas and Zoogloea.