TY - JOUR
T1 - Effects of copper on biological treatment of NMF- and MDG-containing wastewater from TFT-LCD industry
AU - Cheng, Hai Hsuan
AU - Pien, Tzung Tsin
AU - Lee, Ya Ching
AU - Lu, I. Chun
AU - Whang, Liang Ming
N1 - Funding Information:
The authors would like to acknowledge the financial support from the Ministry of Science and Technology of Taiwan [ MOST 105-2221-E-006 -009 -MY3 , 106-2621-M-006-009-MY3 , 108-2622-E-006 -025 -CC2 , MOST 108-2811-E-006 -532 ], the Innolux Corporation, and partially financial support from the Ministry of Education of Taiwan under grant ( D105-33B04 ) for the Top University Project to the National Cheng Kung University (NCKU), Taiwan .
Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2020/11
Y1 - 2020/11
N2 - This study aimed to evaluate the effects of copper on N-methylformamide (NMF)- and methyl diglycol (MDG)-containing wastewater treatment using batch experiments and a lab-scale anoxic–oxic (A/O) sequencing batch reactor (SBR). Batch experimental results indicated that aerobic degradation of NMF followed Monod-type kinetics. Copper inhibition on nitrification also followed Monod-type inhibition kinetics with copper-to-biomass ratio instead of copper concentration. Specific degradation rates of NMF and MDG under both aerobic and anoxic conditions decreased in the matrix of full-scale wastewater, and high copper dosage would further reduce the degradation rates. In the long-term presence of 0.5 mg/L copper, the A/O SBR could maintain stable and complete degradations of NMF and MDG, 95% of COD removal, and more than 50% of total nitrogen (TN) removal. High concentrations of copper spikes, including 40 mg/L and 110 mg/L, slowed down degradation rates for both NMF and MDG, but did not affect COD and TN removal efficiencies in the full 24 h-cycle operation. The long-term A/O SBR operation revealed that daily dosage of 0.5 mg/L copper was not detrimental to NMF/MDG degradations due to regularly wasting sludge, but 110 mg/L of copper spike obviously reduced NMF/MDG degradation rate although it could be recovered later by regularly wasting sludge and maintaining SRT at 20 days.
AB - This study aimed to evaluate the effects of copper on N-methylformamide (NMF)- and methyl diglycol (MDG)-containing wastewater treatment using batch experiments and a lab-scale anoxic–oxic (A/O) sequencing batch reactor (SBR). Batch experimental results indicated that aerobic degradation of NMF followed Monod-type kinetics. Copper inhibition on nitrification also followed Monod-type inhibition kinetics with copper-to-biomass ratio instead of copper concentration. Specific degradation rates of NMF and MDG under both aerobic and anoxic conditions decreased in the matrix of full-scale wastewater, and high copper dosage would further reduce the degradation rates. In the long-term presence of 0.5 mg/L copper, the A/O SBR could maintain stable and complete degradations of NMF and MDG, 95% of COD removal, and more than 50% of total nitrogen (TN) removal. High concentrations of copper spikes, including 40 mg/L and 110 mg/L, slowed down degradation rates for both NMF and MDG, but did not affect COD and TN removal efficiencies in the full 24 h-cycle operation. The long-term A/O SBR operation revealed that daily dosage of 0.5 mg/L copper was not detrimental to NMF/MDG degradations due to regularly wasting sludge, but 110 mg/L of copper spike obviously reduced NMF/MDG degradation rate although it could be recovered later by regularly wasting sludge and maintaining SRT at 20 days.
UR - http://www.scopus.com/inward/record.url?scp=85086365620&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85086365620&partnerID=8YFLogxK
U2 - 10.1016/j.chemosphere.2020.127125
DO - 10.1016/j.chemosphere.2020.127125
M3 - Article
C2 - 32540540
AN - SCOPUS:85086365620
SN - 0045-6535
VL - 258
JO - Chemosphere
JF - Chemosphere
M1 - 127125
ER -