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Optimization of the precursor removal of dichloroacetonitrile (DCAN), an emerging nitrogenous disinfection by-product, in an up-flow BAC filter
- Source :
- Chemosphere. 189:309-318
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- The process parameters of the up-flow biological activated carbon filter (UBACF) were optimized in a pilot-scale trial for controlling the precursor of dichloroacetonitrile (DCAN), an emerging nitrogenous disinfection by-product. The experiments were performed using a central composite design (CCD) with the response surface methodology (RSM). The results showed that the removal efficiencies of formation potentials (FP) of DCAN increased from 28.9% to 64.4% with the optimized ozone dose, expansion rate of BAC and backwashing cycle, being scheduled to 1.52 mg/L, 27% and 9.5 d, respectively. Excitation and emission matrix (EEM) spectra indicated that the fluorescence peaks of aromatic protein (AP) and soluble microbial products-like (SMPs)-like region were weakened significantly in the effluent of improved process (IP) with optimization, which were main precursors of DCAN. The bacterial community before and after the optimization of UBACF was determined using the high-throughput sequencing technology. The class and genus of microorganism demonstrated that the IP had a more diverse microbial community and more even distribution of species in BAC filter. It was favor of the growth of Alphaproteobacteria, Bacilli and Betaproteobacteria attached to the BAC particles, which could biodegrade effectively the precursors of DCAN.
- Subjects :
- Acetonitriles
Environmental Engineering
Central composite design
Nitrogen
Health, Toxicology and Mutagenesis
Microorganism
0208 environmental biotechnology
Analytical chemistry
Backwashing
02 engineering and technology
010501 environmental sciences
Biology
01 natural sciences
Water Purification
Matrix (chemical analysis)
Ozone
Environmental Chemistry
Response surface methodology
Effluent
0105 earth and related environmental sciences
Chromatography
Public Health, Environmental and Occupational Health
Betaproteobacteria
Disinfection by-product
General Medicine
General Chemistry
Biodegradation
Pollution
020801 environmental engineering
Disinfection
Biodegradation, Environmental
Charcoal
Filtration
Water Pollutants, Chemical
Disinfectants
Subjects
Details
- ISSN :
- 00456535
- Volume :
- 189
- Database :
- OpenAIRE
- Journal :
- Chemosphere
- Accession number :
- edsair.doi.dedup.....489066b7504bfb545903060480bb4438