Long-Term Effects of Polyvinyl Chloride Microplastics on Anaerobic Granular Sludge for Recovering Methane from Wastewater

2020 ◽  
Vol 54 (15) ◽  
pp. 9662-9671
Author(s):  
Yu-Ting Zhang ◽  
Wei Wei ◽  
Jing Sun ◽  
Qiuxiang Xu ◽  
Bing-Jie Ni
Keyword(s):  
Polyvinyl Chloride ◽  
Granular Sludge ◽  
Anaerobic Granular Sludge ◽  
Long Term Effects

Progressive stress response of the anaerobic granular sludge to nickel nanoparticles: experimental investigations and mathematic modelling

2019 ◽  
Vol 6 (5) ◽  
pp. 1536-1548 ◽  
Author(s):  
Chuan-Shu He ◽  
Liang Huang ◽  
Rong-Rong Ding ◽  
Hou-Yun Yang ◽  
Yi-Xuan Wang ◽  
...  
Keyword(s):  
Stress Response ◽  
Nickel Nanoparticles ◽  
Granular Sludge ◽  
Experimental Investigations ◽  
Anaerobic Granular Sludge

Long-term exposure to Ni-NPs induced progressive and unrecoverable inhibition of the activity of the AGS.

scholarly journals Stress-Responses of Performance and Microbial Community in Anaerobic Digestion System Under Long-Term Enrichment of Phenanthrene

2021 ◽  
Author(s):  
Yongsen Shi ◽  
Chunli Xu ◽  
Jingyi Li ◽  
Yilin Yao ◽  
Qigui Niu
Keyword(s):  
Microbial Community ◽  
Stress Responses ◽  
System Performance ◽  
Oxygen Demand ◽  
Granular Sludge ◽  
Long Term Effects ◽  
Term Enrichment ◽  
Fermentative Bacteria ◽  
Soluble Chemical Oxygen Demand

The expanded granular sludge blanket reactor (EGSB) was operated for 198 days to study the long-term effects of phenanthrene (PHE) enrichment on system performance and microbial community. The results showed that the PHE was significantly enriched in the reactor. The final PHE concentration in effluent and sludge reached to 1.764±0.05 mg/L and 12.52±0.42 mg/gTS, respectively. While the average daily methane production was decreased by 5.0%-9.8% under long-term PHE exposure. The 3D-EEM of effluent indicated that PHE stimulated the microbial metabolism with the higher intensity of soluble microbial byproduct-like materials (SMP) and proteins. Moreover, the removal efficiency of soluble chemical oxygen demand (SCOD) and NH4+-N gradually diminished with the enrichment of PHE. PHE shaped the microbial community, and the predominant fermentative bacteria (Mesotoga) was severely inhibited. Contrarily, the bacteria (Syntrophorhabdus, Acinetobacter, Desulfovibrio, Desulfomicrobium) involved in PHE-degradation was enriched at end of Phase V. In addition, the relative abundance (RA) of hydrotrophic methanogens (Methanofastidiosum, Methanolinea, Methanobacterium, Methanomassiliicoccus) increased by 0.96-fold with the long-term enrichment of PHE, while the RA of acetoclastic Methanosaeta obviously decreased.

scholarly journals Effect of Increased Influent COD on Relieving the Toxicity of CeO2 NPs on Aerobic Granular Sludge

2019 ◽  
Vol 16 (19) ◽  
pp. 3609 ◽  
Author(s):  
Xiaoying Zheng ◽  
Yuan Zhang ◽  
Wei Chen ◽  
Weihong Wang ◽  
Hang Xu ◽  
...  
Keyword(s):  
Extracellular Polymeric Substances ◽  
Oxygen Demand ◽  
Granular Sludge ◽  
Inhibitory Effect ◽  
Environmental Risks ◽  
Pollutant Removal ◽  
Aerobic Granular Sludge ◽  
Long Term Effects ◽  
Negative Effects

Due to the increased use of cerium oxide nanoparticles (CeO2 NPs), their potential environmental risks have caused concern. However, their effects on the aerobic granular sludge (AGS) process and the later recovery of AGS are still unclear. In this study, we comprehensively determined the changes in pollutant removal and the levels of extracellular polymeric substances (EPS) in AGS that were exposed to CeO2 NP treatments (0 (the control, R0), 1 (R1), and 5 (R5) mg/L), following an increase in the influent chemical oxygen demand (COD). An increase in the CeO2 NP concentration enhanced their inhibitory effect on the removal of total nitrogen (TN) and total phosphorus (TP), and promoted the production of polysaccharides (PS) and proteins (PN) in loosely bound EPS (LB-EPS) or tightly bound EPS (TB-EPS), as well as the dissolved organic carbon (DOC) components in EPS, but had no long-term effects on the removal of organic matter. When the addition of CeO2 NPs was stopped and the concentration of influent COD increased, the TN and TP removal efficiencies in R1 and R5 slowly increased and recovered. In R1, they were only 4.55 ± 0.55% and 2.71 ± 0.58% lower than in R0, respectively, while the corresponding values for R5 were 5.06 ± 0.46% and 6.20 ± 0.63%. Despite the LB-EPS and TB-EPS concentrations in the R1 and R5 treatments recovering and being similar to the levels in the control when no CeO2 NPs were added, they were still slightly higher than in the R0, which indicating that the negative effects of CeO2 NPs could not be completely eliminated due to the residual CeO2 NP levels in AGS.

Response of anaerobic granular sludge to long-term loading of roxarsone: From macro- to micro-scale perspective

2021 ◽  
Vol 204 ◽  
pp. 117599
Author(s):  
Rui Tang ◽  
Haiping Luo ◽  
Henning Prommer ◽  
Zhengbo Yue ◽  
Wei Wang ◽  
...  
Keyword(s):  
Granular Sludge ◽  
Anaerobic Granular Sludge ◽  
Micro Scale
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