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Biodegradation and O3/UV Deep Treatment of Key Components in Coking Wastewater

Author: ZhaoGuoBao
Tutor: RenYuan
School: South China University of Technology
Course: Environmental Engineering
Keywords: coking wastewater biodegradation deep treatment O3/UV kinetics
CLC: X703
Type: Master's thesis
Year: 2013
Downloads: 69
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Abstract


The complicated components of coking wastewater have serious dangerous to humanand aquatic ecological system because of the biological toxicity and hard-biodegradablecharacteristic. The coexistence of various pollutants components is the main reason thehard-biodegradation of coking wastewater. At the same time, the composition and contents ofkey components in this kind of wastewater are unstable. Meanwhile, the differences ofmetabolic types and pathways related to different structure substance, restriced the practicalapplication of specific bacteria which are efficient when they are pure culturing. Therefore,the study of biodegradation characteristics and the interaction analysis of coexistence ofdifferent substance are necessary and they could provide therotical guidance for actualbiological treatment.Two different structure substances m-cresol and quinoline were selected as typicalpollutants in coking wastewater. They were degraded by Lysinibacillus cresolivorans andAchromobacter sp. DN-06, a m-cresol-degrading bacterium and a quinoline-degradingbacterium with different initial concentrations. The degradable ability is also evaluated incoexisting system. Results indicated that L. cresolivorans could completely degrade20.8～309.1mg·L-1m-cresol and Achromobacter sp. DN-06could degrade23.6～199.5mg·L-1quinoline, and both of subsrates removal rates followed a zero-order kinetics equations. Twobacteria cell growth kinetics were well described by the Haldane kinetic models. L.cresolivorans cannot remove quinoline and Achromobacter sp. DN-06cannot degradem-cresol which indicated that there was no interaction between these two bacteria. Thevelocity of m-cresol degradation fitted well to zero kinetic equation although the degradingability of L. cresolivorans was inhibited with the presence of0～100mg l-1quinoline, and theinhibitive effect was confirmed to be a noncompetitive pattern which could be interpreted byMichaelis-Menten kinetics equation with correspondingly parameters Vmax, Km, K1and K2were13.16mg l-1h-1,35.84mg l-1,200.0mg l-1and285.7mg l-1, respectively. Moreover, theaddition of m-cresol-degrading strain can accelerate the removal of quinoline because themetabolites of quinoline could be degraded which attributed to less the delay time during the quinoline removal process.The hydraulic retention time （HRT） and sludge retention time （SRT） in aerobicbiological reaction system decide the removal efficiency of key components. At the laterphase, the removal efficiency is extremely low due to the influence of biodegradation kineticsand substrates inhibition. The cost increases when the retention time prolongs continuely. Thechemical reaction efficiency is significantly higher than that of biological reaction. Therefore,considering the cost and efficiency during the wastewater treatment, O3/UV method wasselected to oxide phenols, quinoline, COD and other key components in tail wastewater. Theadvanced oxidation experiments explored the reaction conditions and analyzed the removalkinetics of key components. The results showed that various inorganic ions and organicpollutants were not degraded yet. The COD removal rates were higher in alkaline conditionthan in acidic condition and the optimal value was pH=9. The COD removal by O3/UV wassignificantly better than that of O3or UV separately and catalysts and flow rates affected theCOD removal. COD removal rate was consistent with a first-order kinetic model whencatalytic oxidized by O3, while NH4+-N removal rate is more suitable for the zero orderkinetics model. Because of the existence of nitrogen-containing substrates, such as SCN-andCN-, the NH4+-N concentration increaseed firstly and then decreased when they were oxidedby O3. The time when ammonia nitrogen concentration reached a maximum value waspositively related to the amount of nitrogen substances. The operation cost of this techniquewas about0.12RMB.m-3when the flow rate was4.m3.h-1. From the analysis of removal rateand cost we can conclude that O3/UV coupled with fluidized bed technique has greatapplication prospect for coking wastewater advanced treatment.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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