Advanced Treatment of Biochemical Treated Coking Wastewater by Ozonation Process

2013 ◽  
Vol 726-731 ◽  
pp. 2515-2520 ◽  
Author(s):  
De Min Yang ◽  
Jian Mei Yuan
Keyword(s):  
Reaction Time ◽  
Reaction Temperature ◽  
Ozone Concentration ◽  
Ph Value ◽  
Removal Rate ◽  
Color Removal ◽  
Advanced Treatment ◽  
Coking Wastewater ◽  
Initial Ph ◽  
Ozonation Process

Advanced treatment of biochemical treated coking wastewater was studied experimentally with ozonation process. The effects of initial pH value, ozone concentration, reaction temperature, and reaction time on the COD and color removal rate were investigated. The results showed that ozonation was an effective method for advanced treatment of biochemical treated coking wastewater. The increasing of initial pH value, ozone concentration, reaction temperature, and reaction time has enhanced the removal rate of COD and color. Meanwhile, the results also revealed that the maximal COD and color removal rate of 69.65% and 92.27% could be reached under the optimal conditions of the initial pH value is 10.5, ozone concentration is 150 mg/L, reaction temperature is 298 K, and reaction time is 30 min.

Advanced Treatment of Coking Wastewater by Electro-Coagulation

2014 ◽  
Vol 700 ◽  
pp. 426-430 ◽  
Author(s):  
Hai Tang ◽  
Jun Peng Sha ◽  
Yang Long Ou ◽  
Xiang Zhao
Keyword(s):  
Reaction Time ◽  
Current Density ◽  
Color Removal ◽  
Advanced Treatment ◽  
Coking Wastewater ◽  
Degradation Behavior ◽  
Optimal Conditions ◽  
Initial Ph ◽  
Electro Coagulation

The degradation behavior and mechanism of biologically pretreated coking wastewater (BPCW) were investigated by means of a lab-scale electro-coagulation (EC) in static methods. The results showed that the percent COD and color removal can reach 80.5 % and 95.4 % respectively under the optimal conditions (initial pH of 8.0; reaction time of 30 min; current density of 14.0 mA/cm2 and NaCl dosage 1.6 g/L).

The pretreatment of acrylonitrile and styrene with the ozonation process

1997 ◽  
Vol 36 (2-3) ◽  
pp. 263-270 ◽  
Author(s):  
Cheng-Nan Chang ◽  
Jih-Gaw Lin ◽  
Allen C. Chao ◽  
Bo-Chuan Cho ◽  
Ruey-Fang Yu
Keyword(s):  
Organic Nitrogen ◽  
Ph Value ◽  
Raw Materials ◽  
Removal Rate ◽  
Acrylonitrile Butadiene Styrene ◽  
Ozone Treatment ◽  
Oxidation Reduction ◽  
Initial Ph ◽  
Cod Removal Rate ◽  
Ozonation Process

Acrylonitrile and styrene are used as the raw materials for manufacturing acrylic fiber, thus they are often found as pollutants in the petrochemical wastewater. This study utilizes ozone to decompose the organic nitrogen contained in acrylonitrile and styrene, and the oxidation process was monitored using on-line measurements of oxidation-reduction potential (ORP) and pH. The efficiency of organic nitrogen decomposition was also estimated based on the COD, organic nitrogen, TOC, ammonia-N, nitrite, and nitrate measurements. Both the initial pH and alkalinity are observed to affect the degradation rate of organic nitrogen. The acrylonitrile sample with the lowest initial pH value (i.e., 4.0) has a shorter t1/2 of 18.9 min and that for samples of the highest initial pH (i.e., 11) was 34 min. The alkalinity of one acrylonitrile sample was boosted by adding 500 mg/l CaCO3, to simulate the field ABS (Acrylonitrile-Butadiene-Styrene) wastewater effluent. It was observed that within a short ozone contact time, the acrylonitrile sample spiked with 500 mg/l CaCO3 had the highest COD decomposition rate of 0.411 min−1, or 1.3 times more than that for samples without addition of CaCO3. Results of the ozonation process can be fitted with a modified Nernst equation for the various pH conditions. Additionally, the ozone treated synthetic ABS sample shows a faster COD removal rate in the subsequent biological process than those samples without ozone treatment.

scholarly journals Taguchi Optimization of Catalytic Ozonation Process Using Modified Bone Char Ash for Removal of Methylene Blue from Aqueous Solution

2020 ◽  
Vol 7 (2) ◽  
pp. 66-71
Author(s):  
Ghorban Asgari ◽  
Somaye Akbari
Keyword(s):  
Methylene Blue ◽  
Reaction Time ◽  
Textile Industry ◽  
Ph Value ◽  
Catalytic Ozonation ◽  
Bone Char ◽  
Operational Parameters ◽  
Taguchi Optimization ◽  
Initial Ph ◽  
Ozonation Process

Methylene blue (MB) dye is an environmental contaminant that has been mostly used in textile industry. Taguchi orthogonal array design was employed as an optimization method to reduce the number of experiments. In this research, bone char ash modified by MgO-Fe catalyst was applied for degradation of MB in catalytic ozonation process (COP) system and operational parameters including initial MB dosages, initial pH, catalyst dose, and contact time were optimized with Taguchi method. Accordingly, the best condition for the removal of MB obtained at initial MB concentration of 20 mg/L, reaction time of 15 minutes, initial pH value of 10, and catalyst concentration of 0.1 g/L. Additionally, optimization of experimental set-up showed that the MB concentration had a notable effect on MB degradation in COP process (55.6%), and reaction time had a negligible effect (1.98%). At this condition, total organic carbon (TOC) removal was determined to be 31% but in longer time, its removal increased to 65%.

Removal of Nonylphenol from Water by Ozone

2013 ◽  
Vol 859 ◽  
pp. 357-360 ◽  
Author(s):  
Xiao Dong Wang ◽  
Yang Lv ◽  
Meng Meng Li ◽  
Hong Ye Liu
Keyword(s):  
Reaction Time ◽  
Ozone Concentration ◽  
Degradation Rate ◽  
Ph Value ◽  
Removal Rate ◽  
Affecting Factors ◽  
Initial Concentration ◽  
Lower Temperature ◽  
Better Than

This study investigates the degradation of Nonylphenol. The degradation affecting factors including solution ozone dosage, initial concentration, pH, temperature and ultraviolet. The results indicated that when the ozone contents changes, the Nonylphenols degradation rate changes as well. The higher ozone concentration contribute to the faster degradation; With the increase of initial concentration of Nonylphenol, the removal rate of it decrease on the contrary, while with the initial concentration increases, the quality of unit ozone degradation of Nonylphenol is ascenting and then tend to a constant; The remove rate of Nonylphenol is improving when the pH value vary from 4.86~10.34. The effect of Nonylphenols ozonation in higher temperatures is better than it is in lower temperature; Ultraviolet radiation is also favorable for the removal of Nonylphenol as it can shorten the reaction time as well as reduce the amount of ozone.

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.

Study on Electrochemical Degradation of Acid Scarlet 3R

2011 ◽  
Vol 71-78 ◽  
pp. 3071-3074
Author(s):  
Jun Sheng Hu ◽  
Yue Li ◽  
Zhuo Wang
Keyword(s):  
Current Density ◽  
Electrolyte Concentration ◽  
Ph Value ◽  
Removal Rate ◽  
Supporting Electrolyte ◽  
Color Removal ◽  
Alkaline Condition ◽  
Dye Wastewater ◽  
Initial Concentration ◽  
Initial Ph

Based on a static experiment, this study researched the electrochemical oxidation process of simulated dye wastewater containing Acid Scarlet 3R in the two-dimensional electrolysing cell. This experiment investigated the effect of such various factors as current density, initial concentration, supporting electrolyte concentration, and the initial pH value on the color removal. The results of the experiment clearly indicated that the rate of color removal increased when the current density was increasing gradually; it decreased when the initial concentration was increasing; it originally increased and then decreased when concentration of electrolytes was increasing; alkaline condition was not conducive to the removal of color, and the effect of decolorization was better under an acid condition than under an alkaline condition. The optimum condition of disposing of dye wastewater is when the current density is 7Am/cm², electrolyte concentration is 0.04mol/L, pH=2.5, under the condition of which the color removal rate could be 96.06%.

Study on Catalytic Wet Oxidation of H-Acid Containing Water over Fe/SiO2 Catalyst

2013 ◽  
Vol 641-642 ◽  
pp. 281-284
Author(s):  
Hong Ya Li ◽  
Bin Xia Zhao ◽  
Wei Li Bai ◽  
Xiao Li Zhang
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Temperature ◽  
Ph Value ◽  
Removal Rate ◽  
Disulfonic Acid ◽  
Peroxide Oxidation ◽  
Catalytic Wet Oxidation ◽  
Hydrogen Peroxide Oxidation ◽  
Initial Ph ◽  
Catalyst Dosage

This study has investigated the degradation of H-acid (1-amino-8-naphthol-3, 6-disulfonic acid) containing water by catalytic wet hydrogen peroxide oxidation method, in which the catalyst of Fe/SiO2 was prepared by impregnation technology. The effect of catalyst dosage, initial pH value, amount of hydrogen peroxide and reaction temperature on the degradation process have been discussed, and the results indicated that wet hydrogen peroxide oxidation is an effective method for treating the wastewater containing H-acid, under the conditions that: catalyst dosage was 2 g, initial pH value was 7, amount of hydrogen peroxide was 10 mL (0.83 time of theoretical required amount) and reaction temperature was 80 °C, the COD and color removal rate can reach 87.3% and 96.5%, respectively.

Study on the Degradation of Plasticizer Di (2-Ethylhexyl) Phthalate by Advanced Oxidation Process

2012 ◽  
Vol 529 ◽  
pp. 463-467
Author(s):  
Yang Yang ◽  
Zhi Wen Lin
Keyword(s):  
Ozone Concentration ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Ph Value ◽  
Removal Rate ◽  
Advanced Oxidation ◽  
Experimental Results ◽  
Initial Ph ◽  
Ethylhexyl Phthalate

Di-(2-ethylhexyl) phthalate (DEHP) is one of the most common plasticizers, it have a wide variety of industrial, agricultural and domestic applications. The degradation characteristics of DEHP in water by the advanced oxidation process O3, UV and UV/O3 were respectively studied. The effects of ozone concentration, DEHP concentration and pH on the removal rate of DEHP were investigated. The experimental results showed that UV was not able to remove DEHP significantly. However, O3 or the combination of O3 with UV could degrade DEHP effectively. Both the increase in the O3 concentration and the initial pH value of the system benefited the DEHP removal.

scholarly journals Using Fenton Oxidation Method to Advanced Treatment of Landfill Leachate

2015 ◽  
Vol 9 (1) ◽  
pp. 58-61 ◽  
Author(s):  
Gao Yanjiao ◽  
Huang Runzhu ◽  
Song Tiehong
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Time ◽  
Landfill Leachate ◽  
Ferrous Sulfate ◽  
Ph Value ◽  
Removal Rate ◽  
Advanced Treatment ◽  
Test Results ◽  
Optimal Conditions ◽  
Optimal Reaction

Hydrogen peroxide and ferrous sulfate were used to advanced treatment of landfill leachate effluent from biochemical tanks. Some influences on removing COD and chroma including the pH value of solution, the dosage of ferrous sulfate, the dosage of hydrogen peroxide and reaction time were investigated. The test results showed that for removal of COD and chroma the optimal pH was 3.0, the best ferrous sulfate and hydrogen peroxide dosage was 1500mg/L, 20mL/L respectively, and the optimal reaction time was 60min. Under optimal conditions, COD and chroma removal rate could reach 79.7% and 95.2% respectively.

Lab Scale Study on Synergistic Disinfection of WWTPS Secondary Effluent by Ultrasonic and Ozone

2012 ◽  
Vol 433-440 ◽  
pp. 4751-4756 ◽  
Author(s):  
Hao Wu ◽  
Zi Fu Li ◽  
Xin Jin ◽  
Xin Zhao ◽  
Fu Rong Deng
Keyword(s):  
Reaction Time ◽  
Removal Rate ◽  
Research Direction ◽  
Synergistic Action ◽  
Color Removal ◽  
Secondary Effluent ◽  
Disinfection Methods ◽  
Number Of Microorganisms ◽  
New Research ◽  
Ozone Disinfection

Secondary effluent from WWTPS still contains a large number of microorganisms, therefore, disinfection is essential. There are many disadvantages in using traditional disinfection methods, so the combination of disinfection techniques is a new research direction. Ozone combined with ultrasound is one of them. In this experiment, the inactivation of the total coli forms, color removal and UV254 removal of secondary effluent by a combination of ultrasonic (frequency20 kHz; power100W) and ozone disinfection was investigated. The results show that the effect of the synergistic action of 30s US and ozone disinfection is superior to the effect of individual ozone disinfection. After 15min synergistic disinfection, the total coli forms inactivation rate is up to 99.9%, simultaneously color removal rate to 80% and UV254 removal rate to 52%. Compared with individual ozone disinfection, reaction time was reduced by 5 min.

Sign in / Sign up

Export Citation Format

Share Document