Oxygen-limited aeration for relieving the impact of phenolic compounds in anaerobic treatment of coal gasification wastewater

2014 ◽  
Vol 95 ◽  
pp. 110-116 ◽  
Author(s):  
Wei Wang ◽  
Jing Zhang ◽  
Shun Wang ◽  
Jun Shen ◽  
Shang-Lei Pan
Keyword(s):  
Phenolic Compounds ◽  
Coal Gasification ◽  
Anaerobic Treatment ◽  
Coal Gasification Wastewater ◽  
The Impact

An advanced anaerobic expanded granular sludge bed (AnaEG) for the treatment of coal gasification wastewater

RSC Advances ◽  
2014 ◽  
Vol 4 (101) ◽  
pp. 57580-57586 ◽  
Author(s):  
Chunjie Li ◽  
Salma Tabassum ◽  
Zhenjia Zhang
Keyword(s):  
Industrial Wastewater ◽  
Coal Gasification ◽  
State Of The Art ◽  
Granular Sludge ◽  
Anaerobic Treatment ◽  
High Toxicity ◽  
Coal Gasification Wastewater

A state-of-the-art advanced anaerobic expanded granular sludge bed (AnaEG) was developed for the anaerobic treatment of coal gasification wastewater (typical industrial wastewater with poor biodegradability and high toxicity).

Treatment Phenolic Compounds in Coal Gasification Wastewater by Hydrolytic Acidification-AO Process

2013 ◽  
Vol 807-809 ◽  
pp. 1083-1086 ◽  
Author(s):  
Peng Xu ◽  
Hong Jun Han ◽  
Sheng Yong Jia ◽  
Bao Lin Hou ◽  
Qian Zhao
Keyword(s):  
Phenolic Compounds ◽  
Coal Gasification ◽  
Total Phenols ◽  
Start Up ◽  
Coal Gasification Wastewater ◽  
Removal Efficiencies ◽  
Two Stages ◽  
Hydrolytic Acidification

Using hydrolytic acidification-AO process treating coal gasification wastewater, the COD, total phenols in the effluent and the removal efficiencies were studied. The start-up period was separated to two stages with influent COD concentration of 1500 and 2500mg/L. After 59 days operation, the COD and total phenols removal efficiencies were 80.3% and 72.9%, respectively. The COD and total phenols increased to 925.4 and 238.7mg/L when the HRT was reduced to 6h with the corresponding concentrations of influent were 2512.9 and 493.4mg/L. When the HRT in hydrolytic acidification was reduced to 100%, the removal of total phenols dropped from 75.4% to 57.6%. The bigger circle ratio of 500% didn't have obviously effect on total phenols removal of the process.

Anaerobic Treatment of Coal Gasification Wastewater

1987 ◽  
Vol 19 (1-2) ◽  
pp. 229-236 ◽  
Author(s):  
Makram T. Suidan ◽  
Peter Fox ◽  
John T. Pfeffer
Keyword(s):  
Activated Carbon ◽  
Coal Gasification ◽  
Physical Adsorption ◽  
Oxygen Demand ◽  
Granular Activated Carbon ◽  
Anaerobic Treatment ◽  
Partial Replacement ◽  
Anaerobic Culture ◽  
Second Stage ◽  
Coal Gasification Wastewater

A sequence of unit processes consisting of a berl-saddle-packed anaerobic filter, an expanded-bed, granular activated carbon anaerobic reactor and an activated sludge nitrification system was employed for the treatment of synthetically prepared coal gasification wastewater. After acclimation, the coal gasification wastewater was fed to the treatment process train at three different chemical oxygen demand levels; these were 1,513. 3,027, and 7,567 mg/ℓ, respectively. No biological activity was observed in the first-stage filter, while excellent removal of organic matter was achieved in the second and third stages of the treatment systems. However, toxicity to the anaerobic culture in the second-stage reactor was observed during the second and third loading levels. This toxicity was overcome by employing a partial replacement schedule of the granular activated carbon medium in the reactor. This study represents an example of how biodegradation and physical adsorption may be successfully combined during the treatment of wastewaters containing toxic or inhibitory substances.

scholarly journals Strategies for recovering inhibition caused by phenolic compounds in a short-cut nitrogen removal reactor treating coal gasification wastewater

2015 ◽  
Vol 5 (4) ◽  
pp. 569-578 ◽  
Author(s):  
Qian Zhao ◽  
Hongjun Han ◽  
Fang Fang ◽  
Haifeng Zhuang ◽  
Dexin Wang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Phenolic Compounds ◽  
Nitrogen Removal ◽  
Coal Gasification ◽  
Activated Carbons ◽  
Powdered Activated Carbon ◽  
Nitrifying Bacteria ◽  
Quick Recovery ◽  
Coal Gasification Wastewater ◽  
Biological Nitrogen

Different strategies, including extension of hydraulic retention time (HRT), dilution, and addition of powdered activated carbon (PAC) and super-powdered activated carbon (S-PAC), were investigated for the quick recovery of nitrifying bacteria activity from the inhibition of coal gasification wastewater (CGW). A laboratory-scale short-cut biological nitrogen removal (SBNR) reactor treating CGW, achieving high levels (90%) of nitrogen removal, was used. After a shock of phenolic compounds (around 250 mg/L) and a failed performance, the results of the batch recovery tests indicated that the PAC and S-PAC addition were the best recovery strategies. In the SBNR reactor, the addition of 1 g/L PAC and S-PAC shortened the recovery time from the natural recovery of 32 days to 13 days and 10 days, respectively. Fluorescence in situ hybridization (FISH) assay and the adsorption isotherms revealed that activated carbons absorbed phenolic compounds, reducing the toxicity and allowing for the quick recovery of SBNRs treating CGW. S-PAC showed greater adsorption capacity for phenol than PAC.

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