PMID- 35381266
OWN - NLM
STAT- MEDLINE
DCOM- 20220524
LR  - 20220524
IS  - 1879-1298 (Electronic)
IS  - 0045-6535 (Linking)
VI  - 299
DP  - 2022 Jul
TI  - Enhancing anaerobic methane production in integrated floating-film activated 
      sludge system filled with novel MWCNTs-modified carriers.
PG  - 134483
LID - S0045-6535(22)00976-6 [pii]
LID - 10.1016/j.chemosphere.2022.134483 [doi]
AB  - Conductive materials can enhance anaerobic methane production by accelerating 
      interspecies electron transfer between electroactive bacteria and methanogens. 
      However, the daily loss or less specific surface area of small/big size of 
      conductive materials always limits their application in anaerobic digestion. In 
      this study, the conductive multi-walled carbon nanotubes (MWCNTs) (15 wt% and 
      20 wt%) were mixed with high-density polyethylene (HDPE) and novel conductive 
      suspended carriers were prepared. Results showed the conductivity of the novel 
      conductive suspended carriers increased by 1-2 orders of magnitude comparing with 
      HDPE carriers, as well as the attached biomass improved from 3.93 g/m(2) (HDPE 
      carriers) to 5.82 g/m(2) (15 wt% MWCNTs-modified carriers) and 6.67 g/m(2) 
      (20 wt% MWCNTs-modified carriers). Integrated floating-film activated sludge 
      (IFFAS) filled with MWCNT-modified carriers showed significant advantages in 
      chemical oxygen demand (COD) removal (removal efficiency increased by 3.6-37.2%) 
      and methanogenic performance (cumulative methane increased by 12.28-62.91%) 
      compared with the control reactor filled with conventional HDPE carriers when 
      treating sodium propionate wastewater at the organic loading rates (OLR) of 
      11.3-26.3 kg COD/(m(3)∙d). SEM images and high-throughput sequencing results proved 
      potential direct interspecies electron transfer (DIET) had been established 
      successfully on the MWCNTs-modified carriers. The syntrophic electroactive 
      bacteria (Geobacter, Thauera) and Methanotrix were enriched by 2.28-4.58% and 
      9.41-16.80% respectively owning to the addition of novel conductive carriers. 
      This study proved IFFAS process filled with novel MWCNTs-modified suspended 
      carriers showed great potential in establishing DIET to enhance anaerobic 
      digestion in practical application.
CI  - Copyright (c) 2022 Elsevier Ltd. All rights reserved.
FAU - Wu, Nan
AU  - Wu N
AD  - Key Laboratory of Industrial Ecology and Environmental Engineering, School of 
      Environmental Science and Technology, Dalian University of Technology, Dalian, 
      116024, China.
FAU - Liu, Tao
AU  - Liu T
AD  - Key Laboratory of Industrial Ecology and Environmental Engineering, School of 
      Environmental Science and Technology, Dalian University of Technology, Dalian, 
      116024, China. Electronic address: taoliu@dlut.edu.cn.
FAU - Li, Qian
AU  - Li Q
AD  - Key Laboratory of Industrial Ecology and Environmental Engineering, School of 
      Environmental Science and Technology, Dalian University of Technology, Dalian, 
      116024, China.
FAU - Quan, Xie
AU  - Quan X
AD  - Key Laboratory of Industrial Ecology and Environmental Engineering, School of 
      Environmental Science and Technology, Dalian University of Technology, Dalian, 
      116024, China.
LA  - eng
PT  - Journal Article
DEP - 20220402
PL  - England
TA  - Chemosphere
JT  - Chemosphere
JID - 0320657
RN  - 0 (Nanotubes, Carbon)
RN  - 0 (Sewage)
RN  - 9002-88-4 (Polyethylene)
RN  - OP0UW79H66 (Methane)
SB  - IM
MH  - Anaerobiosis
MH  - Bacteria/genetics
MH  - Bioreactors
MH  - Methane
MH  - *Nanotubes, Carbon
MH  - Polyethylene
MH  - *Sewage/microbiology
OTO - NOTNLM
OT  - Anaerobic digestion
OT  - Conductive carrier
OT  - Direct interspecies electron transfer (DIET)
OT  - Integrated floating-film activated sludge (IFFAS)
OT  - Methane production
EDAT- 2022/04/06 06:00
MHDA- 2022/05/25 06:00
CRDT- 2022/04/05 20:09
PHST- 2022/01/18 00:00 [received]
PHST- 2022/03/23 00:00 [revised]
PHST- 2022/03/29 00:00 [accepted]
PHST- 2022/04/06 06:00 [pubmed]
PHST- 2022/05/25 06:00 [medline]
PHST- 2022/04/05 20:09 [entrez]
AID - S0045-6535(22)00976-6 [pii]
AID - 10.1016/j.chemosphere.2022.134483 [doi]
PST - ppublish
SO  - Chemosphere. 2022 Jul;299:134483. doi: 10.1016/j.chemosphere.2022.134483. Epub 
      2022 Apr 2.