Pilot-scale catalytic ozonation pretreatment for improving the biodegradability of fixed-bed coal gasification wastewater

2021 ◽  
Vol 148 ◽  
pp. 13-19
Author(s):  
Xiaoya Chen ◽  
Chunrong Wang ◽  
Longxin Jiang ◽  
Haiyan Li ◽  
Jianbing Wang ◽  
...  
Keyword(s):  
Coal Gasification ◽  
Fixed Bed ◽  
Pilot Scale ◽  
Catalytic Ozonation ◽  
Coal Gasification Wastewater

Heterogeneous Catalytic Ozonation of COD and Quinoline from Coal Gasification Wastewater Secondary Effluent with Carbon Supported Copper Oxides as Catalyst

2013 ◽  
Vol 316-317 ◽  
pp. 379-382 ◽  
Author(s):  
Hong Jun Han ◽  
Hai Feng Zhuang
Keyword(s):  
Coal Gasification ◽  
Catalytic Performance ◽  
Catalytic Ozonation ◽  
Radical Scavenger ◽  
Secondary Effluent ◽  
Heterogeneous Catalytic ◽  
Treatment Processes ◽  
Radical Removal ◽  
Coal Gasification Wastewater ◽  
The Stability

Coal gasification wastewater (CGW) is a refractory and toxic wastewater. The secondary effluent quality usually cannot meet the discharge standards after conventional biological treatment processes. Heterogeneous catalytic ozonation is a promising technology for solving this problem. Two carbon materials were investigated as ozonation catalysts for the removal of the quinoline and COD in a real CGW secondary effluent. Results were indicated that CuOx /GAC presented a higher catalytic performance than granular activated carbon and single ozone, efficiency of removal of quinoline and COD were 69%, 92% respectively. Higher pH had positive effect on the degradation of quinoline due to the formation of hydroxyl radical (removal of quinoline rapidly reached above 90% in pH=10). The presence of the radical scavenger tert-butanol (TBA) evidenced the participation of hydroxyl radicals (•OH) in the oxidation mechanisms of quinoline. The stability of the catalysts was demonstrated by carrying repetitive experiments reusing catalysts sample.

Effect of Diatomite Additive on Biomass Respiratory Activity in Activated Sludge

2011 ◽  
Vol 347-353 ◽  
pp. 264-268
Author(s):  
Wen Qi Zhang ◽  
Pin Hua Rao
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Coal Gasification ◽  
Respiratory Activity ◽  
Pilot Scale ◽  
Activated Sludge Process ◽  
Total Phenols ◽  
Biomass Activity ◽  
Coal Gasification Wastewater ◽  
The Stability

Laboratory and pilot scale experiments indicated that the diatomite additive could improve the stability of activated sludge process and the efficiency of COD removal for coal gasification wastewater treatment. In this paper, the effect of diatomite additive on biomass respiratory activity was studied to investigate the enhancing mechanism. Experimental results showed that diatomite additive could enhance biomass activity obviously when the biomass activity was inhibited by the wastewater with total phenols concentration of 188.9 mg/L -501.2 mg/L. It could be concluded that the mechanism of diatomite enhancing biomass activity were its adsorption of phenols and concentration of DO.

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