Kinetic Analysis for COD Removal in Actual Coking Wastewater through an Micro-Aerobic EGSB Reactor

2014 ◽  
Vol 700 ◽  
pp. 455-459 ◽  
Author(s):  
Chun Juan Dong ◽  
Qing Ye Pan
Keyword(s):  
Kinetic Analysis ◽  
Removal Rate ◽  
Pollutant Removal ◽  
Cod Removal ◽  
Utilization Rate ◽  
Coking Wastewater ◽  
Performance Effect ◽  
Dense Granules ◽  
Half Saturation Constant ◽  
Pollutant Removal Rate

Treatment of actual coking wastewater considered to be difficult by traditional systems. The present study is related to treatment of actual coking wastewater through microaerobic EGSB reactor. The study showed the EGSB reactor could attain about 75% high COD removal. IncreasingVupcould strength COD removal. Moreover, high sludge concentration and profound communal synergism existing within the dense granules were very important. As a result of the kinetic analysis of the EGSB reactor treating actual coking wastewater for COD removal using a modified Stover–Kincannon model, the maximum substrate utilization rate,vmax, half saturation constant,KS, inhibitor constant, KI, actual pollutant removal rate, , and the actual inhibition degree,KS/KIwere determined as 2.65×10-3h-1, 39.57mg.L-1, 415.82mg.L-1, 6.7×10-5h-1.mg-1.L and 0.1(before increasingVup), 7.34×10-3h-1, 19.53mg.L-1, 197.76mg.L-1, 3.7×10-4h-1.mg-1.L and 0.1(after increasingVup), and 9.35×10-3h-1, 6.38mg.L-1, 162.81mg.L-1, 1.47×10-3h-1.mg-1.L and 0.04 (after increasingVupand X), respectively. The inhibition of toxic contaminants in the actual coking wastewater would cause the decreasing of pollutant removal rate, however, enhancing and X (simultaneously optimizing sludge aggregate structure) could strengthen the performance effect.

Kinetic Analysis of COD Removal from Actual Domestic Wastewater in an Expanded Granular Sludge Bed (EGSB) Reactor

2012 ◽  
Vol 610-613 ◽  
pp. 1691-1695
Author(s):  
Chun Juan Dong ◽  
Qing Ye Pan
Keyword(s):  
Low Temperature ◽  
Removal Efficiency ◽  
Removal Rate ◽  
Experimental Studies ◽  
Domestic Wastewater ◽  
Pollutant Removal ◽  
Cod Removal ◽  
Utilization Rate ◽  
Cod Removal Efficiency ◽  
Pollutant Removal Rate

Treatment of actual domestic wastewater at ambient temperature, even low temperature is considered to be difficult by traditional systems. The present study is related to treatment of actual domestic wastewater in an EGSB reactor. The study showed the effectiveness of biological treatment of actual domestic wastewater involving appropriate microorganism and granules in an EGSB reactor. At 26°C, the reactor was operated at 18.7kg COD.m−3.d−1 of average organic loading and 83% high COD removal efficiency, and even at the highest loading rate of 57.12kgCOD.m−3.d−1, the COD removal efficiency still could attain to 68%. Varied influent flow need to supply varied optimal and thus to ensure the optimal removal effect. Low temperature would cause pollutant removal rate decrease. However, enhancing could optimize the contact of sludge and wastewater and thus strengthen the performance effect. Modified Stover–Kincannon model was applied to data obtained from experimental studies in EGSB reactor. Treatment efficiencies of the reactor were investigated at different hydraulic retention times (0.5-1.3h) and different operation temperature (15°C, 26°C). The modified Stover–Kincannon model was best fitted to the EGSB reactor, and the substrate utilization rate( ), saturation constant value( ), and actual pollutant removal rate( ) were found to be , , and for 26°C, , , and for 15°C( before increasing ), and , , and for 15°C(after increasing ). Low temperature could cause decrease and thus cause distinct decreasing of COD removal efficiency. However, increasing could increase and accordingly increase COD removal efficiency.

Experimental Advancements of Wastewater Disposal in Coal Chemical Industry by Yeasts

2014 ◽  
Vol 1073-1076 ◽  
pp. 941-948
Author(s):  
Li Li Wang ◽  
Qian Yang
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Chemical Industry ◽  
Ph Value ◽  
Removal Rate ◽  
Cod Removal ◽  
Good Effect ◽  
Coking Wastewater ◽  
Torula Yeast ◽  
N Removal ◽  
Cod Removal Rate

The research in this paper focuses on improving the COD removal rate of the coking wastewater and the NH3-N removal rate and thus diversifying measures to dispose microbial floras in wastewater from the coal chemical industry. The means of adding nutrients, acid treatment and coagulation sedimentation react synergistically to dispose the organic contaminants in the coking wastewater. We attempted to combine Saccharomyces cerevisiae, Torula yeast, tropical Candida mycoderma, etc. to exploit the respective advantages to the full and improve the disposal effect. According to the COD sample (27000-30000) and NH3-N (2500-3000) offered by the client company, the COD removal rate ranged from 24.2% to 31.8% in the mixed experiment group of Saccharomyces cerevisiae and Torula yeast, with NH3-N removal rate from 63.5% to 69.6%. Obviously, the NH3-N removal rate produced good effect. Meanwhile, the COD removal rate ranged form 35.3% to 41.8% in the experiment group only adjusting PH value and the NH3-N removal rate ranged from 40.2% to 50.2%. It is obvious that NH3-N removal rate is influenced by the amount of bacterial strain.

Advanced Treatment of Secondary Sewage Effluent by Iron-Carbon Internal Electrolysis

2011 ◽  
Vol 183-185 ◽  
pp. 291-295
Author(s):  
Li Hua Cheng ◽  
Xue Jun Bi ◽  
Chang Qing Liu
Keyword(s):  
Reaction Time ◽  
Removal Rate ◽  
Pollutant Removal ◽  
Advanced Treatment ◽  
Tertiary Treatment ◽  
Dynamic Experiment ◽  
Internal Electrolysis ◽  
Initial Ph ◽  
Degradation Reaction ◽  
Pollutant Removal Rate

Due to increasing water scarcity, appropriate technologies were need for advanced treatment of wastewater to enable reuse. Effect of iron-carbon internal electrolysis in tertiary treatment of wastewater was investigated in this study. Static experiment was adopted to evaluate influence of Fe/C ratio, pH, reaction time and aeration on pollutant removal by iron-carbon internal electrolysis. Then dynamic experiment was conducted to determine removal rate of CODcr, TP, chroma and NO3--N. The results showed that internal electrolysis could remove CODcr, TP and chroma efficiently. The optimal ratio of Fe/C was 1:1. Initial pH could affect removal efficiency. In acid circumstance, the removal rate was higher. Degradation reaction by internal electrolysis was fast. when the reaction time was 10min, the removal rate could be ideal. In the process of internal electrolysis, aeration could increase pollutant removal rate. In aerated system, when the reaction time was only 15min, removal rate of CODcr, TP and chroma could reach 49.2%, 89% and 75%. But in non-aerated system, only when the reaction time was 100min could removal rate of these indexes reach 46.5%, 81% and 85.1%. In dynamic experiment, removal rate of CODcr, TP, chroma and NO3- could reach above 40%, 90%, 75% and 20%, respectively.

The coupling of hemin with persistent free radicals induces a nonradical mechanism for oxidation of pollutants

2016 ◽  
Vol 52 (61) ◽  
pp. 9566-9569 ◽  
Author(s):  
Bin Jiang ◽  
Dejun Dai ◽  
Yuyuan Yao ◽  
Tiefeng Xu ◽  
Renhong Li ◽  
...  
Keyword(s):  
Free Radicals ◽  
Removal Rate ◽  
Pollutant Removal ◽  
Pollutant Removal Rate

Herein, we report that persistent free radicals (PFRs) based on MWCNTs significantly accelerate the pollutant removal rate.

scholarly journals Effect of Different Influent Conditions on Biomass Production and Nutrient Removal by Aeration Microalgae Membrane Bioreactor (ICFB-MMBR) System for Mariculture Wastewater Treatment

Membranes ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 874
Author(s):  
Yi Ding ◽  
Shiyuan Wang ◽  
Hang Ma ◽  
Binyu Ma ◽  
Zhansheng Guo ◽  
...  
Keyword(s):  
Growth Rate ◽  
Wastewater Treatment ◽  
Removal Efficiency ◽  
Biomass Production ◽  
Nutrient Removal ◽  
Membrane Bioreactor ◽  
Removal Rate ◽  
Pollutant Removal ◽  
Average Growth ◽  
Pollutant Removal Rate

The nutrient removal and biomass production of the internal circulating fluidized bed microalgae membrane bioreactor (ICFB-MMBR) was studied under different cultivation modes, influent TOC, influent pH, and influent N/P. Platymonas helgolandica tsingtaoensis was used as the biological source. The growth of P. helgolandica tsingtaoensis and the removal efficiency of pollutants in the mixotrophy culture mode were improved compared with other culture modes. With the increased influent TOC, the average growth rate of P. helgolandica tsingtaoensis increased, and ammonia nitrogen and total phosphorus removal rate were improved. The P. helgolandica tsingtaoensis growth rate and nutrient removal efficiencies at the influent pH of 8 were the best among the different influent pH values. As the influent N/P ratio increased from 5 to 20, the P. helgolandica tsingtaoensis growth rate and pollutant removal rate increased gradually. When the influent N/P ratio was higher than 20, the P. helgolandica tsingtaoensis growth rate and pollutant removal rate tended to be stable and did not significantly change with the increase of influent N/P ratio. At the proper influent conditions, the high P. helgolandica tsingtaoensis biomass and nutrient removal efficiency could be obtained in the microalgae membrane bioreactor, which could provide a theoretical basis for the application of the system for wastewater treatment.

A Study on Advanced Treatment for Coking Wastewater with Biological Activated Carbon Based on Efficient Degrading Flora

2012 ◽  
Vol 581-582 ◽  
pp. 1129-1132 ◽  
Author(s):  
Guang Hua Wang ◽  
Xue Qin Liu ◽  
Wen Bing Li ◽  
Yun Zhou Lu ◽  
Ming Dong Sun
Keyword(s):  
Waste Water ◽  
Activated Carbon ◽  
Removal Efficiency ◽  
Removal Rate ◽  
Cod Removal ◽  
Advanced Treatment ◽  
Coking Wastewater ◽  
Biological Activated Carbon ◽  
Removal Ratio ◽  
Cod Removal Rate

The removal efficiency of degrading flora which has been constructed is investigated in biological carbon process through the variation of COD and chromaticity. The results show that the efficient degrading strains can reproduce on the activated carbon quickly；the biological activated carbon reactor，in which degrading flora to coking waste water are inoculated，is adopted to carry out the treatment of wastewater，in such a way the COD and chromaticity in outflow water can remain at a lower level (with COD about 50mg/L and chromaticity about 50 degree). The average COD removal rate is 71% and the chromaticity removal ratio is 95%.

Area-based speciation kinetic analysis of the multipollutant removal in Constructed Wetlands to enhance its treatment efficiency

2021 ◽  
Author(s):  
Manoj Kumar ◽  
Rajesh Singh
Keyword(s):  
Wastewater Treatment ◽  
Kinetic Analysis ◽  
Constructed Wetlands ◽  
Municipal Wastewater ◽  
Zero Order ◽  
Pollutant Removal ◽  
Municipal Wastewater Treatment ◽  
Treatment Efficiency ◽  
First Order ◽  
Present Study Area

In the present study area-based, pollutant removal kinetic analysis was considered using the Zero-order, first-order decay and efficiency loss (EL) models in the constructed wetlands (CWs) for municipal wastewater treatment....

Research of 6-Nitry Industrial Wastewater Treatment by Coagulation-Fenton Oxidation

2012 ◽  
Vol 518-523 ◽  
pp. 2745-2748
Author(s):  
Ling Yan Ren ◽  
Gang Xu
Keyword(s):  
Treatment Effect ◽  
Industrial Wastewater ◽  
Removal Rate ◽  
Sulfate Solution ◽  
Cod Removal ◽  
Fenton Oxidation ◽  
Fenton Reagent ◽  
Oxidation Treatment ◽  
Cod Removal Rate ◽  
Solution Acidity

The paper adopted Coagulation-Fenton Oxidation Method on treating the wastewater of 6-nitro-1,2 diazonium oxygroup naphthalene-4-sulfoacid production process (i.e. 6-nitry wastewater), introduced the treatment effect of the combined technology used on 6-nitry wastewater, and studied the factors influencing the treatment effect, to determine the reasonable parameters of the technology on treating 6-nitry wastewater. The results showed that Using polyaluminium chloride (mass fraction 2%) as flocculant for treating 6-nitry wastewater, the COD removal rate reached up to 48.7%; Making Fenton reagent oxidation treatment on coagulation yielding water, under the best conditions for solution acidity controlled at pH3 or so, in the 100 mL wastewater, 30% hydrogen peroxide was 5.0 mL, 0.5 mol/L ferrous sulfate solution was 4.0 mL, reaction time was 60 min, the COD removal rate could reach 98% or more.

Study on Spray on Degradation of TNT-RDX Explosives Wastewater by Synergetic Ozonation

2013 ◽  
Vol 726-731 ◽  
pp. 2316-2319
Author(s):  
Hai Xia Duan
Keyword(s):  
Gas Phase ◽  
Removal Rate ◽  
Droplet Diameter ◽  
Cod Removal ◽  
The Self ◽  
Cod Removal Rate

TNT-RDX wastewater is hard to biodegrade and highly toxic. The self-made reactor was used to degrade the wastewater, spray and the conditions of droplet diameter, number of nozzle, spray height were clearly observed. The results show that the average COD removal rate of TNT-RDX wastewater was 69.6%.The spray conditions can improve the dispersion of the wastewater and increase the use of the residual ozone in gas phase. Keywords: Spray; TNT-RDX wastewater; ozone; UV; GAC

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