Recovery strategies for tackling the impact of phenolic compounds in a UASB reactor treating coal gasification wastewater |
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| Authors: | Wang Wei Han Hongjun |
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| Affiliation: | a School of Civil Engineering, Hefei University of Technology, Hefei 230009, China
b State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), Harbin Institute of Technology, Harbin 150090, China |
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| Abstract: | The impact of phenolic compounds (around 3.2 g/L) resulted in a completely failed performance in a mesophilic UASB reactor treating coal gasification wastewater. The recovery strategies, including extension of HRT, dilution, oxygen-limited aeration, and addition of powdered activated carbon were evaluated in batch tests, in order to obtain the most appropriate way for the quick recovery of the failed reactor performance. Results indicated that addition of powdered activated carbon and oxygen-limited aeration were the best recovery strategies in the batch tests. In the UASB reactor, addition of powdered activated carbon of 1 g/L shortened the recovery time from 25 to 9 days and oxygen-limited aeration of 0-0.5 mgO2/L reduced the recovery time to 17 days. Reduction of bioavailable concentration of phenolic compounds and recovery of sludge activity were the decisive factors for the recovery strategies to tackle the impact of phenolic compounds in anaerobic treatment of coal gasification wastewater. |
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| Keywords: | BOD, biochemical oxygen demand CGWW, coal gasification wastewater COD, chemical oxygen demand DO, dissolved oxygen GAC, granular activated carbon HRT, hydraulic retention time MIBK, methyl isobutyl ketone OLR, organic loading rate PAC, powdered activated carbon SS, suspended solids SUR, sludge utilization rate UASB, upflow anaerobic sludge blanket VSS, volatile suspended solids |
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