Effect of Adding Rare Earths into Iron-Carbon Micro Electrolysis Process on Degradation of Dyeing Wastewater

2014 ◽  
Vol 1021 ◽  
pp. 25-28 ◽  
Author(s):  
Ju Chi Kuang
Keyword(s):  
Iron Powder ◽  
Rare Earths ◽  
Removal Rate ◽  
Waste Water Treatment ◽  
Great Influence ◽  
Powder Particle Size ◽  
Powder Size ◽  
Dyeing Wastewater ◽  
Related Factors ◽  
Electrolysis Process

Nowadays the traditional dyeing wastewater treatments based on flocculation-biochemical technology become more difficult than before. The study in this paper aim was it to probe how adding rare earths (REs) into iron-carbon micro-electrolysis process to advance dyeing wastewater degradation. Firstly, the principle was discussed. Then the experimental methods were stated and it followed by exploring effect of iron powder size on the dye decolorization rate. Next were design of the micro electrolysis orthogonal experiments and discussion of influences of related factors on waste water treatment. The experimental results show that besides common iron powder particle size and the processing time, the factors that have great influence on dyeing wastewater treatment are Ce4+, pH, La3+ and iron/carbon ratio. The sequence of factors influence on wastewater micro-electrolysis treatment is Ce4+ > pH > La3+ > iron/carbon ratio. When pH is 6, COD removal rate arrives at maximum 89%, however when the pH is in the case of too high or too low, the effect of sewage degradation is not good.

Effect of Rare Earths on Iron-Carbon Micro Electrolysis in Dyeing Wastewater Treatment

2014 ◽  
Vol 1010-1012 ◽  
pp. 190-194
Author(s):  
Xiao Gang Chen ◽  
Ju Chi Kuang ◽  
Min Hua Chen
Keyword(s):  
Wastewater Treatment ◽  
Removal Rate ◽  
Waste Water Treatment ◽  
Sewage Treatment ◽  
Main Role ◽  
Dyeing Wastewater ◽  
Related Factors ◽  
Orthogonal Experiments ◽  
Cerium Ion ◽  
Cod Removal Rate

In the paper we first discussed the principle of wastewater treatment by iron-carbon micro electrolysis. And the experimental methods were stated clear soon afterwards. Then we designed the micro electrolysis orthogonal experiments. Discussion of influences of related factors on waste water treatment followed. The main factors are cerium ion additive quantity, ratio of La3+/Ce4+ and pH in wastewater. The experimental results show that 1) The sequence of factors influence on wastewater micro-electrolysis treatment is Ce4+ > pH > La3+ > iron/carbon ratio; 2) The lanthanum and cerium ions have a synergistic effect in the wastewater treatment, and cerium ion plays a main role; 3) When pH is 6, COD removal rate arrives at maximum 89%, however when the pH is in the case of too high or too low, the effect of sewage treatment is not good.

Treatment of Actual Dyeing Wastewater by Continuous Iron-Carbon Micro-Electrolysis Process

2013 ◽  
Vol 838-841 ◽  
pp. 2395-2399 ◽  
Author(s):  
Yi Bo Wang ◽  
Yong Hong Liu ◽  
Wei Fu ◽  
Li Cheng Chen ◽  
Yao Zhong Li ◽  
...  
Keyword(s):  
Raw Materials ◽  
Removal Rate ◽  
Continuous Operation ◽  
Reflux Ratio ◽  
Dyeing Wastewater ◽  
Electrolysis Process ◽  
Eds Analysis ◽  
Operation Test ◽  
Cod Removal Rate ◽  
Stable Stage

Continuous treating process by iron-carbon micro-electrolytic technology treating actual dyeing wastewater was studied, performance of the micro-electrolysis reactor (MER) assembled homemade iron-carbon micro-electrolysis materials (MEM) and the process of alkaline addition, the properties of iron mud (flocculation precipitation produced from alkaline addition) were also investigated. The results shows that:(1) COD removal rate of MER was stable at around 60%, and the chroma could reached less than 40 times at stable stage of 60 days operation; (2) According to 30 days of continuous operation test, 7.6 kg of iron mud was produced when one ton wastewater was treated in this system; it was also found that iron mud can be recycled as raw materials for the synthesis of MEM by EDS analysis; (3)Effluent reflux (reflux ratio 1~1.5) could effectively reduce the dosage of alkali in practical process.

The biofilm filter sequencing batch reactor (BFSBR)

1999 ◽  
Vol 39 (8) ◽  
pp. 77-83 ◽  
Author(s):  
S. Brinke-Seiferth ◽  
J. Behrendt ◽  
I. Sekoulov
Keyword(s):  
Waste Water ◽  
Reaction Rate ◽  
Removal Rate ◽  
Batch Reactor ◽  
Waste Water Treatment ◽  
Fixed Bed ◽  
Great Influence ◽  
Water Velocity ◽  
Nitrification Rate ◽  
Order Kinetic

A new concept for waste water treatment based on biofilm technology is developed. Industrial waste water can be treated flexibly in a single reactor in which multiple processes can be carried out. The low cost of investment allows a cost-saving advanced treatment for the pollutants from small and medium sized factories as well as for separate streams of process waste water. The submerged reactor filled with packed material works in intermittent mode. After filling the reactor with waste water, the water is recirculated. During the recirculation phase the biofilm carriers will be fluidized to minimize the boundary layer and to maximize the reaction rate. During the last biofilm filtration phase the water will be discharged through the bed material. Suspended solids and dissolved residual pollutants are further reduced. The retention time in the reactor can be chosen depending on the effluent requirements. Results from fixed bed pilot scale experiments show that, depending on superficial water velocity, a part of the volume is not flowing through convectively. This stagnant volume has a great influence on the reaction rate and can be reduced by increasing superficial water velocity. The nitrification rate of a fixed bed depends on oxygen transfer. Increasing the superficial air velocity from 5 m/h to 15 m/h will increase the reaction rate by about 50%. The reaction in the fixed bed can be described as half order kinetic. Removal rate constants of k1/2A=0.86 (vair= 10 m/h) and 1.13 g NH4-N0.5m−0.5·d−1 (vair=15 m/h) could be achieved.

scholarly journals Degradation of Bisphenol a Using Horseradish Peroxidase Immobilized on Fe-based MOFs

2021 ◽  
Author(s):  
Wenting Cai ◽  
Jiaxin Xu ◽  
Jianhua Cheng ◽  
Kesi Du ◽  
Yuancai Chen
Keyword(s):  
Horseradish Peroxidase ◽  
Bisphenol A ◽  
Removal Rate ◽  
Metal Organic Framework ◽  
Waste Water Treatment ◽  
Great Influence ◽  
Immobilized Enzymes ◽  
Fixation Method ◽  
Metal Organic ◽  
First Time

Abstract In this study, we synthesized a water-stable Fe-based metal-organic framework, MIL-88B (Fe) by a solvothermal method, and for the first time, MIL-88B (Fe)/HRP composite was prepared for the degradation of bisphenol A (BPA) by immobilizing horseradish peroxidase on MIL-88B (Fe) using covalent fixation method. The material was characterized via XRD, FTIR, TG, and SEM methods. The results showed that the composite could remove bisphenol A quickly and efficiently by adding the hydrophilic agent polyethylene glycol, with the removal rate of BPA up to 99.2% within 1 hour. In addition, the initial concentration of bisphenol A, the dosage of the immobilized enzyme and the amount of H2O2 added had a great influence on the degradation efficiency. It was found that immobilized HRP could be reused, and its storage stability and thermal stability were better than free HRP. These show that immobilized enzymes have a broad application prospect in waste-water treatment.

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.

Effects of Transition Metals and Rare Earths on Iron-Carbon Micro Electrolysis Degrading Dyeing Effluent

2014 ◽  
Vol 1010-1012 ◽  
pp. 928-933
Author(s):  
Ju Chi Kuang ◽  
Xiao Gang Chen ◽  
Min Hua Chen
Keyword(s):  
Rare Earth ◽  
Rare Earths ◽  
Valence Electron ◽  
Zero Valent Iron ◽  
Effluent Treatment ◽  
Related Factors ◽  
Valence Electron Structure ◽  
Iron Catalysis ◽  
Orthogonal Experiments ◽  
Dyeing Effluent

The principle and methodology of effluent treatment by iron-carbon micro electrolysis were introduced in the paper. Then design of the orthogonal experiments for dyeing effluent treatment was formulated. Discussion of influences of related factors on effluent treatment followed. Results were got after the detailed analysis. Therefore, we deduced the mechanism that the cations of Transition Metal (TM) and rare earth (RE) assist of zero-valent irons catalyzing degradation of dyeing effluent. The mechanism is formed based on the following explanation. Cations of manganese and cobalt easily penetrate Fe0lattices, while Ce4+cations do it difficultly because of their larger radius. Thus Ce4+is weaker than both of Mn2+and Co2+for helping zero-valent irons to improve their activity. Furthermore, because the valence electron structure of Mn2+is more stable than that of Co2+, Mn2+is better for assisting zero-valent iron catalysis of degradation of dyeing effluent than Co2+. Therefore, ranking of influence for zero-valent iron catalysis activity from greatest to smallest is Mn2+, Co2+and Ce4+.

Effect of Flow Pattern on Energy Consumption and Properties of Copper Powder in the Electrolytic Process

2018 ◽  
Vol 279 ◽  
pp. 77-84 ◽  
Author(s):  
Wen Tang Xia ◽  
Xiao Yan Xiang ◽  
Wen Qiang Yang ◽  
Jian Guo Yin
Keyword(s):  
Energy Consumption ◽  
Current Efficiency ◽  
Flow Pattern ◽  
Copper Powder ◽  
Dendritic Structure ◽  
Electrolysis Cell ◽  
Powder Size ◽  
Low Oxygen ◽  
Electrolysis Process ◽  
Electrolytic Process

Because of distinctive properties, such as dendritic structure, high green strength, and low oxygen content, electrolytic copper powder has been widely used in aviation, aerospace, national defense industry and other domains. But at present, energy consumption of the electrolysis process in copper powder production is high, and the current efficiency is only about 90%. Therefore,the decrease in energy consumption of the electrolysis process has become the major bottlenecks in the development of the enterprises. In this paper, a new electrolysis cell with different electrolyte inlet arranged on the cell was manufactured. Then, the effect of flow pattern of electrolyte on the current efficiency, energy consumption and properties of copper powder was investigated. The experimental results showed that the electrolytic process had the higher current efficiency, lower energy consumption and smaller copper powders when the flow rate is 0.5l/min in the paralleled inlet and 1.5 l/min in the traditional inlet. Under the optimal conditions, the current efficiency, energy consumption and copper powder size were 99.10%, 712.90kw∙h/t and 47.80um respectively. This means an obvious rise in current efficiency and decrease in energy consumption compared to traditional feeding method.

Electrochemical oxidative degradation of indigo wastewater based on chlorine-containing system

2020 ◽  
Vol 49 (1) ◽  
pp. 46-54 ◽  
Author(s):  
Wei Zhang ◽  
Weiwei Lv ◽  
Xiaoyan Li ◽  
Jiming Yao
Keyword(s):  
Chemical Oxygen Demand ◽  
Response Surface ◽  
Electrochemical Oxidation ◽  
Surface Analysis ◽  
Removal Rate ◽  
Oxidative Degradation ◽  
Oxygen Demand ◽  
Single Factor ◽  
Dyeing Wastewater ◽  
Content Type

Purpose In this study, the oxidative degradation performance of indigo wastewater based on electrochemical systems was explored. The decolourization degrees, removal rate of chemical oxygen demand and biochemical oxygen demand of the indigo wastewater after degradation were evaluated and optimized treatment conditions being obtained. Design/methodology/approach The single factor method was first used to select the electrolyte system and electrode materials. Then the response surface analysis based on Box–Behnken Design was chosen to determine the influence of four independent variables such as FeCl3 concentration, NaCl concentration, decolourization time and voltage on the degradation efficiency. Findings On the basis of single factor experiment, the electrode material of stainless steel was selected in the double cell, and the indigo wastewater was electrolyzed with FeCl3 and NaCl electrolytes. The process conditions of electrochemical degradation of indigo wastewater were optimized by response surface analysis: the concentration of FeCl3 and NaCl was of 16 and 9 g/L, respectively, with a decolourization time of 50 min, voltage of 10 V and decolourization percentage of 98.94. The maximum removal rate of chemical oxygen demand reached 75.46 per cent. The highest ratio of B/C was 3.77, which was considered to be more biodegradable. Research limitations/implications Dyeing wastewater is bringing out more and more pollution problems to the environment. However, there are some shortcomings in traditional technologies such as adsorption and filtration. As a kind of efficient and clean water treatment technology, electrochemical oxidation has been applied to the treatments of various types of wastewater. The decolourization and degradation of indigo wastewater is taken as an example to provide reference for the treatment of wastewater in actual plants. Practical implications The developed method provided a simple and practical solution for efficiently degrading indigo wastewater. Originality/value The method for the electrochemical oxidation technology was novel and could find numerous applications in the degradation of printing and dyeing wastewater.

scholarly journals Newly Designed Hydrolysis Acidification Flat-Sheet Ceramic Membrane Bioreactor for Treating High-Strength Dyeing Wastewater

2019 ◽  
Vol 16 (5) ◽  
pp. 777 ◽  
Author(s):  
Yue Jin ◽  
Dunqiu Wang ◽  
Wenjie Zhang
Keyword(s):  
Membrane Bioreactor ◽  
Ceramic Membrane ◽  
Removal Rate ◽  
High Strength ◽  
Organic Loading Rate ◽  
Pseudomonas Sp ◽  
Dyeing Wastewater ◽  
Flat Sheet ◽  
Cost Effective Treatment ◽  
Hydrolysis Acidification

Cost-effective treatment of dyeing wastewater remains a challenge. In this study, a newly designed hydrolysis acidification flat-sheet ceramic membrane bioreactor (HA-CMBR) was used in treating high-strength dyeing wastewater. The start-up phase of the HA-CMBR was accomplished in 29 days by using cultivated seed sludge. Chemical oxygen demand (COD) removal rate reached about 62% with influent COD of 7800 mg/L and an organic loading rate of 7.80 kg-COD/(m3·d). Chromaticity removal exceeded 99%. The results show that the HA-CMBR has good removal performance in treating dyeing wastewater. The HA-CMBR could run with low energy consumption at trans-membrane pressure (TMP) <10 kPa due to the good water permeability of the flat-sheet ceramic membrane. New strains with 92%–96% similarity to Alkalibaculum bacchi, Pseudomonas sp., Desulfovibrio sp., and Halothiobacillaceae were identified in the HA-CMBR. Microbial population analysis indicated that Desulfovibrio sp., Deltaproteobacteria, Halothiobacillaceae, Alkalibaculum sp., Pseudomonas sp., Desulfomicrobium sp., and Chlorobaculum sp. dominated in the HA-CMBR.

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