Study on the Flocculation Treatment of Simulative Dyeing Wastewater by the Dicyandiamide Formaldehyde Polymer

2014 ◽  
Vol 522-524 ◽  
pp. 192-195 ◽  
Author(s):  
Shan Hong Lan ◽  
Ping Ma ◽  
Hui Xia Lan ◽  
Heng Zhang ◽  
Xiu Wen Wu ◽  
...  
Keyword(s):  
Influencing Factors ◽  
Treatment Effect ◽  
Room Temperature ◽  
Removal Rate ◽  
Color Removal ◽  
Experimental Results ◽  
Dyeing Wastewater ◽  
Simulated Wastewater

The laboratory-made dicyandiamide formaldehyde polymer is used to study the effect of the flocculation treatment of simulated wastewater of You Li Su-hong EB. And the influencing factors mainly include flocculant dosage, pH and temperature. The experimental results show that when the dicyandiamide formaldehyde flocculant dosage is 8mL / L and pH is acidic or neutral, COD and color removal rate are the highest that have reached more than 70%. Besides, temperature has little effect on the flocculation treatment, and room temperature is enough to make the treatment effect good. Finally compared with the commonly used flocculant PAC, dicyandiamide formaldehyde polymer treatment effect is better with less addition.

The Experimental Study of Rural Domestic Sewage Treated with the Mixture of Diatomite and Coagulant

2011 ◽  
Vol 356-360 ◽  
pp. 2153-2157
Author(s):  
Chao Li ◽  
Xiao Yan Zhang ◽  
Jun Liang Liu ◽  
Ding Ding
Keyword(s):  
Experimental Study ◽  
Influencing Factors ◽  
Treatment Effect ◽  
Removal Rate ◽  
Orthogonal Experiment ◽  
Ammonia Nitrogen ◽  
Domestic Sewage ◽  
Stirring Time

In this study, we treat rural domestic sewage with the mixture of diatomite and three kinds of coagulant. The result shows that with three mixtures, CODcr removal rate can be above 40%, and above 35% that of ammonia nitrogen. Compared with diatomite alone, the treatment effect has been significantly improved. We can come to a conclusion by the orthogonal experiment that the influencing factors on the effect of coagulant have following order: pH> dosage >stirring time, which means Ph plays an important role on the effect of coagulant.

Electrochemical Degradation of Methylene Blue Aqueous Solution on Electrospinning Nanofibers (ESF) Electrodes

2013 ◽  
Vol 807-809 ◽  
pp. 1362-1367
Author(s):  
Li Li ◽  
Ying Liu ◽  
Yi Fan Li
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Specific Surface ◽  
Treatment Effect ◽  
Removal Rate ◽  
Supporting Electrolyte ◽  
Color Removal ◽  
The Other ◽  
Electrochemical Degradation ◽  
Initial Ph

This study mostly investigated the influences of electrolytic conditions and the structure of electrospinning nanofibers electrodes on the degradation of methylene blue in details. For PAN and Fe/PAN electrodes, was prepared by electrospinning.It was found that the ESF electrodes with higher specific surface area, and higher mesopore percentage could be push the electrochemical degradation. As the same time, adjusted the initial pH, increased the current, and added to electrolyte also could improve the treatment effect of electrochemical degradation. After 90min of electrolysis, the color removal efficiency of methylene blue reached 97.6% at current with 100mA, supporting electrolyte of NaCl with 0.1mol/L and initial pH with 3~5. Under the same current conditions with the Pt-Fe/PAN anodes the color removal rate of degradation were higher efficiency than the other two anodes.

scholarly journals Synthesis of a Decolourising Agent and its Application

2020 ◽  
Vol 28 (1(139)) ◽  
pp. 100-105
Author(s):  
Yuanjun Liu ◽  
Yongtao Yu ◽  
Huanfu Du ◽  
Jiarong Niu ◽  
Xiaoming Zhao
Keyword(s):  
Room Temperature ◽  
Ph Value ◽  
Strong Acid ◽  
Reactive Dye ◽  
Weak Acid ◽  
Acid Dye ◽  
Dyeing Wastewater ◽  
Printing And Dyeing Wastewater ◽  
Simulated Wastewater ◽  
Direct Dye

A type of cationic decolourising agent was prepared and applied to printing and dyeing wastewater treatment. The effects of the concentration of the decolourising agent, the pH value and stirring speed on decolourisation efficiency were studied. The results show that the optimum decolourisation process of the decolourising agent is determined as follows: at room temperature, a dosage of the decolourising agent of 7 mg/l, pH =7.0, and a stirring speed of 150 rpm. The decolourising agent applied to decolourise a direct dye, strong acid dye, weak acid dye and reactive dye in simulated wastewater showed high decolourisation efficiency in all cases. The range of decolourisation efficiency from the highest to lowest is as follows: direct dye, weak acid dye, strong acid dye, and reactive dye.

Influence Factors of Cu-Fe-La/FSC Catalyst Applications in CWAO Technology

2013 ◽  
Vol 467 ◽  
pp. 133-137
Author(s):  
Yong Li Zhang ◽  
Yan Ling Shun
Keyword(s):  
Reaction Temperature ◽  
Treatment Effect ◽  
Removal Rate ◽  
Influence Factors ◽  
Catalytic Wet Air Oxidation ◽  
Dyeing Wastewater ◽  
Air Oxidation ◽  
Wet Air Oxidation ◽  
Reaction Pressure ◽  
Printing And Dyeing Wastewater

Catalytic Wet Air Oxidation (CWAO) is one of advanced oxidation methods about organic wastewater treatment, and the treatment effect of high concentration organic wastewater is remarkable with this method. In this study, the influence factors of the reaction temperature, the reaction pressure and the influent pH were researched on the treatment of the printing and dyeing wastewater with Cu-Fe-La/FSC catalyst, by the single factor experiments and Catalytic Wet Air Oxidation (CWAO) method. Then the catalysts were evaluated by two aspects of the activity and stability. The results show that: with the increase of the reaction temperatures and the reaction pressures, and with the decrease of the influent pH, the CODCrremoval rate improved and the effluent pH reduced. However, the amount of dissolution catalyst components increased with the improvement of treatment effect and the extension of reaction time. By weighing the activity and stability of the catalysts, the optimized reaction temperature, the reaction pressure and the influent pH are 180 °C, 2.5 MPa and 7.25, respectively. Under the optimized operating conditions, the printing and dyeing wastewater with CODCrof 2000 mg/L reaches the CODCrremoval rate of 78.2%, and the dissolvedC[Cu] andC[Fe] of the catalysts are 12.2 and 10.9 mg/L, respectively. Therefore, the catalyst Cu-Fe-La/FSC presents the high activity and stability.

A Combined Electrocoagulation-Electrooxidation Treatment on CTMP Wastewater

2011 ◽  
Vol 233-235 ◽  
pp. 619-622 ◽  
Author(s):  
Zhi Jun Hu ◽  
You Ming Li
Keyword(s):  
Reaction Time ◽  
Sodium Chloride ◽  
Influencing Factors ◽  
Removal Rate ◽  
Color Removal ◽  
Current Intensity ◽  
Optimum Conditions ◽  
Charged Species ◽  
Synergistic Combination

A synergistic combination of electrocoagulation and electrooxidation was introduced for the treatment of CTMP wastewater in which most of the colloids and charged species had been removed by electrocoagulatio, then small organics could be mineralized by electrooxidation effectively.The mainly influencing factors for electrocoagulation such as electrolyte, sodium chloride dosage, voltage intensity, current intensity and reaction time were assessed. The optimum conditions were obtained, and the results showed that sodium chloride dosage of 1g/L, voltage intensity of 7.5V, current intensity of 0.6A, 60 min reaction time, its color removal rate was above 90% and CODCr removal rate was about 40%. After electrocoagulation the electrooxidation could further reduce CODCr above 80%.

Experimental Research on the Treatment of Printing and Dyeing Wastewater Using Ultrasound Combined with Fenton Reagent

2015 ◽  
Vol 713-715 ◽  
pp. 2703-2705
Author(s):  
Ying Gang Wang ◽  
Lin Lin ◽  
Teng Fei Liu ◽  
Jin Meng Zhang
Keyword(s):  
Hydrogen Peroxide ◽  
Experimental Research ◽  
Removal Rate ◽  
Orthogonal Test ◽  
Experimental Results ◽  
Ultrasonic Power ◽  
Dyeing Wastewater ◽  
Fenton Reagent ◽  
Reaction Conditions ◽  
Printing And Dyeing Wastewater

Experimental research on the treatment of printing and dyeing wastewater has been carried out. The method of ultrasonic combined Fenton has been used.Separately by using ultrasonic and Fenton oxidation method to treat printing and dyeing wastewater, the hydrogen peroxide dosage, FeSO4•7H2O dosage, shaking time, pH value, ultrasonic time, ultrasonic power and other factors are investigated.The COD and chromaticity removal effect of printing and dyeing wastewater are calculated. The experimental results show that the above factors have a certain impact on the treatment effect. Based on these results, the orthogonal test method is used in this experiment, the optimal conditions of ultrasound combined with Fenton reagent for dealing printing and dyeing wastewater has been determined.The orthogonal experimental results show that the optimal reaction conditions of orthogonal test are below:pH value is 3, the best time for the experiment is 1.5h, hydrogen peroxide dosage is 5mL, seven water ferrous sulfate dosage is 0.7grams, ultrasonic power is 142.5W. Experiments are conducted in accordance with the best reaction conditions. On the optimal process conditions, the removal rate of COD reaches 94.6% and the chroma removal rate reaches 87.5%. The effect of using ultrasonic combined with Fenton reagent to treat printing and dyeing wastewater is better than the use of single method.

Enhanced COD Removal Efficiency by Using an Electro-Shocking Biofilm

2014 ◽  
Vol 1073-1076 ◽  
pp. 693-695
Author(s):  
Zhen Wei Ni ◽  
Yin Mei Wang ◽  
Wen Ping Cao
Keyword(s):  
Removal Efficiency ◽  
Direct Current ◽  
Removal Rate ◽  
Cod Removal ◽  
Experimental Results ◽  
Biofilm Reactors ◽  
Cod Removal Efficiency ◽  
Simulated Wastewater

Two parallel biofilm reactors were developed and applied for treating the simulated wastewater. The experimental results showed that compared with a without electric-shocking biofilm, and a mean removal rate of COD increased by 18.82% by shocking of direct current. Which suggested that the electro-shocking can significantly increase the removal rate of COD.

Study on Demulsification-Fenton to Deal with High Concentrations of Waster Emulsion

2013 ◽  
Vol 726-731 ◽  
pp. 2300-2304
Author(s):  
Hai Shan Dong ◽  
Jing Jing Liu ◽  
Peng Yan ◽  
Rong Yang
Keyword(s):  
Hydrogen Peroxide ◽  
Influencing Factors ◽  
Removal Efficiency ◽  
Removal Rate ◽  
Cod Removal ◽  
Fenton Oxidation ◽  
Experimental Results ◽  
Fenton Reagent ◽  
Cod Removal Rate ◽  
High Concentrations

This topic used the method of demulsification-Fenton oxidation to deal with the waste emulsion, and analyzed the influencing factors of COD removal efficiency . Experimental results show that when the dosage of demulsifier is 10g/L ,optimum aeration for 1h , dosage of Fe2+ is 500mg/L, the dosage of hydrogen peroxide is 50ml/L, After Fenton reagent has oxided for 1.5 h, the COD removal rate can up to 93.4%.

scholarly journals Analysis of the Influencing Factors of FDM-Supported Positions for the Compressive Strength of Printing Components

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4008
Author(s):  
Zhengkai Feng ◽  
Heng Wang ◽  
Chuanjiang Wang ◽  
Xiujuan Sun ◽  
Shuai Zhang
Keyword(s):  
Compressive Strength ◽  
Stress Intensity ◽  
Influencing Factors ◽  
Fused Deposition Modeling ◽  
Experimental Results ◽  
Compression Tests ◽  
Suspended State ◽  
Fused Deposition ◽  
Deposition Modeling ◽  
Reference Experiment

Fused deposition modeling (FDM) has the advantage of being able to process complex workpieces with relatively simple operations. However, when processing complex components in a suspended state, it is necessary to add support parts to be processed and formed, which indicates an excessive dependence on support. The stress intensity of the supported positions of the printing components can be modified by changing the supporting model of the parts, their density, and their distance in relation to the Z direction in the FDM printing settings. The focus of the present work was to study the influences of these three modified factors on the stress intensity of the supporting position of the printing components. In this study, 99 sets of compression tests were carried out using a position of an FDM-supported part, and the experimental results were observed and analyzed with a 3D topographic imager. A reference experiment on the anti-pressure abilities of the printing components without support was also conducted. The experimental results clarify how the above factors can affect the anti-pressure abilities of the supporting positions of the printing components. According to the results, when the supporting density is 30% and the supporting distance in the Z direction is Z = 0.14, the compressive strength of the printing component is lowest. When the supporting density of the printing component is ≤30% and the supporting distance in the Z direction is Z ≥ 0.10, the compressive strength of printing without support is greater than that of the linear support model. Under the same conditions, the grid-support method offers the highest compressive strength.

Study on Pretreatment of Dye Wastewater by Fenton Oxidation Process

2012 ◽  
Vol 627 ◽  
pp. 378-381
Author(s):  
Bi Rong Wang
Keyword(s):  
Reaction Time ◽  
Oxidation Process ◽  
Removal Rate ◽  
Fenton Oxidation ◽  
Dye Wastewater ◽  
Dyeing Wastewater ◽  
Reaction Conditions ◽  
Fenton Oxidation Process

Fenton pretreatment has been used for treating dye wastewater. The effects of the dos of H2O2 and FeSO4, reaction time and pH on the removal COD were investigated. It was found that, when the reaction conditions are as follows: COD 2850 mg/L dyeing wastewater, the dosage of H2O2 is 140mmol/L, FeSO4 17.02 mmol/L, pH 7.6, and reaction time 1.0 h, the CODcr of dye wastewater removal rate of up to 70%. Fenton pretreatment process of dye wastewater has a broad prospect.

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