Abstract
Purpose of this study was to determine the treatability of 2, 4-dichlorophenol (2, 4-DCP) by anaerobic granular sludge which was acclimated by mixed mono-chlorphenols (2-CP, 4-MCP). The characteristic of degradation of 2, 4-DCP by anaerobic sludge acclimated by mixed mono-chlorphenols was investigated through shake flask study and performance of continuous flow anaerobic bioreactors. The difference of degradation of 2, 4-DCP by acclimated and unacclimated sludge was also compared. 2, 4-DCP was degraded at 50 h and 180 h respectively for acclimated and unacclimated sludge, which testified that acclimated sludge could more effectively degrade 2, 4-DCP. Although the intermediate product 4-MCP was present in both reaction system, 4-MCP could be degraded completely after 400 h in the acclimated sludge but accumulated in the unacclimated sludge. Therefore, acclimation by the mixed mono-chlorphenols (2-CP, 4-MCP) could enhance the ability of para-and meta-dechlorination for anaerobic sludge and increase the treatability of 2, 4-DCP. The results of continuous anaerobic sludge-suspended carrier bioreactor (ASSCB) indicate that inoculation of the acclimated sludge by mixed mono-chlorphenols can degrade two mono-chlorphenols simultaneously, shorten the setup period, and increase the efficiency of degrading 2, 4-DCP. 2-CP was easily degraded with removal rate of over 80%. While the removal rate of 4-MCP was fluctuating within 30%-80% with changes of its influent concentration.
Original language | English (US) |
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Pages (from-to) | 1252-1257 |
Number of pages | 6 |
Journal | Huanjing Kexue/Environmental Science |
Volume | 28 |
Issue number | 6 |
State | Published - Jun 2007 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- General Environmental Science
Keywords
- 2, 4-DCP
- Anaerobic degradation
- Chlorphenol
- Dechlorination