High performance biofilm process for treating wastewater discharged from coal refining plants containing nitrogen, cyanide and thiocyanate
SCIE
SCOPUS
- Title
- High performance biofilm process for treating wastewater discharged from coal refining plants containing nitrogen, cyanide and thiocyanate
- Authors
- Jeong, Y; Park, BG; Chung, JS
- Date Issued
- 2005-01
- Publisher
- I W A PUBLISHING
- Abstract
- Wastewater discharge from coal refining plants contains a number of biologically toxic compounds; 2000-2500 mg/l of COD of which 40% is composed of phenol, 100-400 mg/l of thiocyanate, 10-40 mg/l of cyanide, 100-250 mg/l of NH4+-N and 150-300 mg/l of total nitrogen. In order to treat this kind of high strength wastewater, we have developed a high performance biofilm process using fluidizing bio-carriers of the tube chip type. The fluidizing biofilm carriers are made of a composite of polyethylene and several inorganic materials, whose density is controlled at 0.97-0.98 g/ml. The fluidizing biofilm carriers show sound fluidization characteristics inside bioreactors. The wastewater is treated using three consecutive series reactors in oxic-anoxic-oxic arrangement. Each reactor is charged with the fluidizing biofilm carriers of 50 vol%. Furthermore, newly cultured active microorganisms for the thiocyanate biodegradation are added in the biofilm process. At total hydraulic retention time of 2.2 days, this process can achieve steady state removal efficiencies: COD, 99%; thiocyanate, 99%; NH4+-N, 99% and total nitrogen, 90%.
- Keywords
- biofilm process; coal wastewater; fluidized-bed; thiocyanate; nitrogen removal; BIOLOGICAL OXIDATION; WASTEWATERS; INHIBITION; REMOVAL; NITRIFICATION; GASIFICATION; DEGRADATION; AMMONIA; REACTOR; COKING
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/24238
- DOI
- 10.2166/wst.2005.0709
- ISSN
- 0273-1223
- Article Type
- Article
- Citation
- WATER SCIENCE AND TECHNOLOGY, vol. 52, no. 10-11, page. 325 - 334, 2005-01
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