Sequential biological treatment including ozonation for persistent organic compounds = 오존처리와 연속 생물학적공정을 병행한 난분해성 유기화합물의 분해

Cited 0 time in webofscience Cited 0 time in scopus
  • Hit : 384
  • Download : 0
2,4,6-trichlorophenol is widely used as insecticides, herbicides and fungicides as well as preservatives for wood, glue, paint, vegetable fibers and leather. It is included in the effluent from pulp mills and contaminate soils around wood-preserving industries and groundwater environment due to surface runoff or direct industrial waste discharges. PVA (polyvinyl alcohol) and HEC (hydroxyethyl cellulose) have been used in the chemical industry, especially in the expandable polystyrene manufacturing process. They remained in the environment for a longtime and could not be effectively destroyed by conventional wastewater treatment processes. Molecular weights of PVA and HEC are more than 25,000 amu. The objectives of this research are as followed. First, it is to determine the parameters and performance of anoxic-oxic process used for complete degradation of persistent organic compounds, esp. PAV and HEC in petrochemical wastewater and 2,4,6-TCP. Second one is to suggest the method for determining biodegradability. The third is to evaluate the effects of ozonation on biodegradability. Last one is to define the toxic effect of 2,4,6-TCP under anoxic condition and find out the parameters of inhibition model. In the study of biodegradation using anoxic-oxic process, 2,4,6-TCP was completely removed at recycle rate of 1.5Q and HRT of 18 hours. However, the removal efficiency of 2,4,6-TCP decreased as recycle rates increased. The wastewater from expandable polystyrene (EPS) process was treated using anoxic-oxic process. PVA was completely removed and the removal efficiency of COD and HEC reached to 83% and 89.4% at recycle rate of 2.5Q, HRT of 30 hours and organic loading rate of 0.9 g COD/L·day. When ozonation was applied to petrochemical wastewater, post-ozonation was more effective than pre-ozonation. The removal efficiencies of COD and HEC increased to 92% and 93% at ozone feed rate of 0.18 mmole/min. Biodegradability was estimated using methane potential,...
Advisors
Shin, Hang-Sikresearcher신항식researcher
Description
한국과학기술원 : 토목공학과,
Publisher
한국과학기술원
Issue Date
1999
Identifier
155990/325007 / 000955233
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 토목공학과, 1999.8, [ viii, 108 p. ]

Keywords

Sequential biological treatment; Persistent organics; Ozonation; Biodegradability; 생분해도; 연속생물학적공정; 난분해성 유기물질; 오존

URI
http://hdl.handle.net/10203/30512
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=155990&flag=dissertation
Appears in Collection
CE-Theses_Ph.D.(박사논문)
Files in This Item
There are no files associated with this item.

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0