Bioaugmentation with isolated strains for the removal of toxic and refractory organics from coking wastewater in a membrane bioreactor

2015 ◽  
Vol 26 (6) ◽  
pp. 465-474 ◽  
Author(s):  
Xiaobiao Zhu ◽  
Rui Liu ◽  
Cong Liu ◽  
Lujun Chen
Keyword(s):  
Membrane Bioreactor ◽  
Coking Wastewater ◽  
Refractory Organics

scholarly journals Electrochemical Oxidation Using BDD Anodes Combined with Biological Aerated Filter for Biotreated Coking Wastewater Treatment

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
C. R. Wang ◽  
Z. F. Hou ◽  
M. R. Zhang ◽  
J. Qi ◽  
J. Wang
Keyword(s):  
Wastewater Treatment ◽  
Electrochemical Oxidation ◽  
Average Energy ◽  
Coking Wastewater ◽  
Biological Aerated Filter ◽  
Treatment Technology ◽  
N Removal ◽  
Aerated Filter ◽  
Refractory Organics ◽  
Bdd Anodes

Coking wastewater is characterized by poor biodegradability and high microorganism toxicity. Thus, it is difficult to meet Grade I of Integrated Wastewater Discharge Standard of China by biological treatment technology; specifically, COD cannot meet above standard due to containing refractory organics. A novel coupling reactor, electrochemical oxidation using BDD anodes and biological aerated filter (BAF), has been developed for carbon and nitrogen removal from biotreated coking wastewater, focusing on COD, BOD5,NH4+-N, andNO3--N removal on operation over 90 days with average effluent value of 91.3, 9.73, 0.62, and 13.34 mgL−1, respectively. Average value of BOD5/COD and BOD5/NO3--N was enhanced from 0.05 to 0.27 and from 0.45 to 1.21 by electrochemical oxidation, respectively, with average energy consumption of 67.9 kWh kg−1COD. In addition, the refractory organics also were evidently mineralized in the unit based on the data of the three-dimensional fluorescence spectra. Meanwhile, its effluent provided excellent substrate for biological denitrification in BAF. At hydraulic retention time (HRT) of 13.08 h, about 12 mgL−1  NO3--N was depleted through denitrification, and it mainly occurred at top of 0.25 m height of BAF. Therefore, it is feasible to apply the coupling reactor for biotreated coking wastewater treatment and achieve desirable effluent quality.

Research on Oxidation Methods for Coking Wastewater Treatment

2014 ◽  
Vol 926-930 ◽  
pp. 4320-4323
Author(s):  
Kun Huang ◽  
Bing Xin Du ◽  
Jia Yu Zhang
Keyword(s):  
Wastewater Treatment ◽  
Electrochemical Oxidation ◽  
Chemical Oxidation ◽  
Development Prospect ◽  
Coking Wastewater ◽  
Air Oxidation ◽  
Wet Air Oxidation ◽  
Complex Composition ◽  
Refractory Organics

Coking wastewater treatment has a complex composition and the properties of high content of refractory organics and poor biodegradability. Coking wastewater treatment based on oxidation technique has drawn a lot of attention because of its advantages. Various common oxidation methods are reviewed in this research, such as wet air oxidation, chemical oxidation, ozonation and electrochemical oxidation. The development prospect of coking wastewater treatment based on oxidation methods is analyzed.

Treatment of Coking Wastewater by a Submerged Membrane Bioreactor with Suspended Carriers

2014 ◽  
Vol 1065-1069 ◽  
pp. 3235-3238
Author(s):  
Qi Yuan Gu ◽  
Ming Yue Li
Keyword(s):  
Removal Efficiency ◽  
Membrane Fouling ◽  
Membrane Filtration ◽  
Membrane Bioreactor ◽  
Operation Time ◽  
Phenol Removal ◽  
Coking Wastewater ◽  
Submerged Membrane Bioreactor ◽  
Biofilm Process ◽  
Suspended Carrier

A renovated hybrid membrane bioreactor (HMBR) was investigated for its capability of coking wastewater treatment. The HMBR combined biofilm process and membrane filtration process. The system was efficient in degrading COD and phenol in coking wastewater and controlling membrane. It was found that the coking wastewater could be effectively treated with 88.6% of COD removal efficiency and 98.3% of phenol removal efficiency at hydraulic retention time (HRT) of 16 h. The removal efficiency of COD and phenol decreased gradually down to 83.2% and 97.7% when HRT decreased to 8 h. The long term experiments indicated that the degree of membrane fouling for HMBR was far lower than that for MBR. The scrubbing effect of suspended carrier in HMBR was observed to be capable of reducing the cake fouling of membrane. The operation time of HMBR was 8.4-fold longer than that with MBR.

Preparation of a PASi-P(AM-ADB) hybrid flocculant and efficiently removal bio-refractory organics from coking wastewater

2018 ◽  
Vol 17 (1) ◽  
pp. 509-514 ◽  
Author(s):  
Shujun Wang ◽  
Enze Li ◽  
Zhiping Du ◽  
Jianfeng Li ◽  
Fangqin Cheng
Keyword(s):  
Coking Wastewater ◽  
Refractory Organics
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