While polycyclic aromatic hydrocarbons (PAHs) are an important persistent toxic organic contaminant, the toxicities of substituted polycyclic aromatic hydrocarbons (SPAHs) are much higher than PAHs. Water and sludge samples were collected from the Qingdao Chengyang Sewage Treatment Plant (STP). The distribution and removal of 16 PAHs and nitro-PAHs (NPAHs), methyl-PAHs (MPAHs), and oxy-PAHs (OPAHs) in the SBR/MBBR process were analyzed. The results showed that 16 PAHs and 13 SPAHs were detected. In the influent water, the total concentrations of PAHs and SPAHs were 3835.14 ng·L and 6889.46 ng·L, respectively, which were much higher than those of STPs in other regions. In the effluent, the total concentrations of PAHs and SPAHs were 1148.18 ng·L and 1724.57 ng·L, respectively, and the removal rates were up to 70.06% and 74.97%, respectively. The SBR/MBBR process presented a more effective removal capacity for PAHs and SPAHs. The removal of PAHs was mainly by the biodegradation of low-ring polycyclic aromatic hydrocarbons (LMW-PAHs)in the aqueous phase; while the removal of PAHsin the particle phase mainly relied on the adsorption and precipitation of LMW-PAHs in the primary sedimentation tank and the biosorption of high-ring polycyclic aromatic hydrocarbons (HMW-PAHs) in the bio-unit. For SPAHs, the removal efficiency of MPAHs (up to 89.15%) was the best under the functions ofparticle adsorption and biodegradation. The removal rate of OPAHs was 63.36%, which was mainly removed by the adsorption of primary particles in the aqueous phase and the biosorption from the biological treatment unit in the particlephase, and the removal rate of NPAHs was 48.85% and largely occurred in the biological treatment unit. The removal mechanism of SPAHs in SBR/MBBR process was not the same. Therefore, STPs should take adequate control measures according to the distribution characteristics of PAHs and SPAHs in different treatment units. Additionally, the concentrations of PAHs and SPAHs in sludge were higher than those in the effluent. Thus, the management of PAHs and SPAHs in sludge should be improved.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.13227/j.hjkx.201807099 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Machine learning models to predict the bioaccessibility of parent and substituted polycyclic aromatic hydrocarbons (PAHs) in food: Impact on accurate health risk assessment.
J Hazard Mater
December 2024
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
Article Synopsis
- * Machine learning models, particularly the random forest model, showed promise in predicting PAH bioaccessibility in foods, with food lipid and protein contents being critical factors influencing this bioaccessibility.
- * The study found that bioaccessibility considerations significantly lowered estimated cancer risk from PAHs in food, yet risks still exceeded safe limits; 6-nitrochrysene emerged as particularly concerning due to its high toxicity, underscoring the need for improved health risk assessment methods.
Machine learning predicts the growth of cyanobacterial genera in river systems and reveals their different environmental responses.
Sci Total Environ
October 2024
Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Cyanobacterial blooms are a common and serious problem in global freshwater environments. However, the response mechanisms of various cyanobacterial genera to multiple nutrients and pollutants, as well as the factors driving their competitive dominance, remain unclear or controversial. The relative abundance and cell density of two dominant cyanobacterial genera (i.
View Article and Find Full Text PDFOccurrence, removal, and risk assessment of polycyclic aromatic hydrocarbons and their derivatives in typical wastewater treatment plants.
Environ Res
July 2024
Key Laboratory of Pollution Processes and Environmental Criteria at Ministry of Education, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China. Electronic address:
Wastewater treatment plants (WWTPs) have a certain removal capacity for polycyclic aromatic hydrocarbons (PAHs) and their derivatives, but some of them are discharged with effluent into the environment, which can affect the environment. Therefore, to understand the presence, sources, and potential risks of PAHs and their derivatives in WWTPs. Sixteen PAHs, three chlorinated polycyclic aromatic hydrocarbons (ClPAHs), three oxidized polycyclic aromatic hydrocarbons (OPAHs), and three methylated polycyclic aromatic hydrocarbons (MPAHs) were detected in the influent and effluent water of three WWTPs in China.
View Article and Find Full Text PDFThe occurrence, sources, and health risks of substituted polycyclic aromatic hydrocarbons (SPAHs) cannot be ignored.
Environ Int
January 2024
Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China. Electronic address:
Similar to parent polycyclic aromatic hydrocarbons (PPAHs), substituted PAHs (SPAHs) are prevalent in the environment and harmful to humans. However, they have not received much attention. This study investigated the occurrence, distribution, and sources of 10 PPAHs and 15 SPAHs in soil, water, and indoor and outdoor PM and dust in high-exposure areas (EA) near industrial parks and low-exposure areas (EA) far from industrial parks.
View Article and Find Full Text PDFSpatiotemporal variability of PAHs and their derivatives in sediments of the Laizhou Bay in the eastern China: Occurrence, source, and ecological risk assessment.
J Hazard Mater
October 2023
College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, PR China.
To understand the pollution status and risk levels in the Laizhou Bay, the spatiotemporal distribution, source, and ecological risk of 16 polycyclic aromatic hydrocarbons (PAHs) and 20 substituted PAHs (SPAHs) were studied in surface sediments in 2022. The findings indicated significant seasonal differences in the concentrations of PAHs and SPAHs under the influences of precipitation, temperature, light, and human activities, with higher storage levels in summer than in spring, and there was also a spatial distribution trend of estuary > coast > offshore. 2-Nitrofluorene (2-NF) and 2-methylnaphthalene (2-MN) were the most abundant components of SPAHs in both spring and summer, with levels of 21.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!