Effects of copper on biological treatment of NMF- and MDG-containing wastewater from TFT-LCD industry
| Autor: | Hai Hsuan Cheng, I-Chun Lu, Tzung-Tsin Pien, Ya-Ching Lee, Liang Ming Whang |
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| Rok vydání: | 2020 |
| Předmět: |
Environmental Engineering
Nitrogen Health Toxicology and Mutagenesis 0208 environmental biotechnology Kinetics chemistry.chemical_element Industrial Waste Sequencing batch reactor 02 engineering and technology 010501 environmental sciences Wastewater 01 natural sciences Waste Disposal Fluid Bioreactors Manufacturing Industry Environmental Chemistry Biomass 0105 earth and related environmental sciences Formamides Sewage Chemistry Public Health Environmental and Occupational Health General Medicine General Chemistry Pollution Copper Anoxic waters Nitrification 020801 environmental engineering Biodegradation Environmental Degradation (geology) Sewage treatment Water Pollutants Chemical Nuclear chemistry |
| Zdroj: | Chemosphere. 258 |
| ISSN: | 1879-1298 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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