Removal of polycyclic aromatic hydrocarbons during anaerobic biostimulation of marine sediments

被引:64
作者
Bianco, F. [1 ]
Race, M. [1 ]
Papirio, S. [2 ]
Esposito, G. [2 ]
机构
[1] Univ Cassino & Southern Lazio, Dept Civil & Mech Engn, Via Biasio 43, I-03043 Cassino, Italy
[2] Univ Napoli Federico II, Dept Civil Architectural & Environm Engn, Via Claudio 21, I-80125 Naples, Italy
关键词
PAHs; Soil bioremediation; Digestate; OFMSW; Bioavailability; Biogas; PAH-CONTAMINATED SOIL; SOLID-PHASE EXTRACTION; BACTERIAL CONSORTIUM; BIOGAS PRODUCTION; ORGANIC-CARBON; HEAVY-METALS; BIOREMEDIATION; DEGRADATION; BIOAVAILABILITY; BIODEGRADATION;
D O I
10.1016/j.scitotenv.2019.136141
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
This study proposes the supplementation of digestate, fresh organic fraction of municipal solid waste (OFMSW) and a nutrient solution during the anaerobic biostimulation of marine sediments contaminated by polycyclic aromatic hydrocarbons (PAHs). The experimental activity was conducted with four PAHs (i.e. phenanthrene, anthracene, fluoranthene and pyrene) under controlled mesophilic conditions (37 +/- 1 degrees C) in 100 mL serum bottles maintained at 130 rpm. After 120 days of incubation, the highest total PAH degradation of 53 and 55% was observed in the experiments with digestate + nutrients and OFMSW + nutrients, respectively. Phenanthrene was the most degraded PAH and the highest removal of 69% was achieved with OFMSW + nutrients. The anaerobic PAH degradation proceeded through the accumulation of volatile fatty acids and the production of hydrogen and methane as biogas constituents. The highest cumulative biohydrogen production of 80 mL H-2.g VS-1 was obtained when OFMSW was used as the sole amendment, whereas the highest biomethane yield of 140 mL CH4.g VS-1 was obtainedwith OFMSW+ nutrients. The evolution of PAH removal during anaerobic digestion revealed a higher impact of the methanogenic phase rather than acidogenic phase on PAH degradation. (C) 2019 Elsevier B.V. All rights reserved.
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页数:11
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