Discharge Plasma for the Treatment of Industrial Wastewater

2011 ◽  
Vol 71-78 ◽  
pp. 3075-3078
Author(s):  
Ai Hua Gao ◽  
Shui Jiao Yang ◽  
Shang Bin Hu ◽  
Xiao Qing He ◽  
Zhi Guo Lu
Keyword(s):  
Organic Contaminants ◽  
Atmospheric Pressure ◽  
Industrial Wastewater ◽  
Discharge Plasma ◽  
Oxygen Demand ◽  
Dyeing Wastewater ◽  
Printing And Dyeing Wastewater ◽  
Industrial Wastewaters ◽  
Very High ◽  
Air Discharge

The treatment of industrial wastewaters collected from petrochemical works, gypsum plant, and printing and dyeing mill, was investigated at atmospheric pressure in air discharge plasma. The degradation effects of organic contaminants in water were compared for the printing and dyeing wastewater under different discharging conditions and for the wastewater from the other two plants under the same discharging conditions. The influences of several factors on chemical oxygen demand (COD) remove rate were studied experimentally. The results showed that the treatment effects for the same industrial wastewater differed significant under different discharge conditions. There may be a suitable discharge plasma treatment to specific industrial wastewater. Due to the removal rates of COD of industrial wastewaters with discharge plasma isn’t very high, therefore the discharge plasma water treating needs to combine conventional water treating methods or addition other catalyst to effectively remove organic pollutants in wastewater and obtain the expected treatment effect.

Performance and fouling characterization of a five-bore hollow fiber membrane in a membrane bioreactor for the treatment of printing and dyeing wastewater

2016 ◽  
Vol 87 (1) ◽  
pp. 102-109 ◽  
Author(s):  
Chunyan Ma ◽  
Xiaoqian Wu ◽  
Zhenhong Liu
Keyword(s):  
Hollow Fiber ◽  
Membrane Bioreactor ◽  
Hollow Fiber Membrane ◽  
Oxygen Demand ◽  
Dyeing Wastewater ◽  
Fiber Membrane ◽  
Step Method ◽  
Critical Flux ◽  
Printing And Dyeing Wastewater ◽  
Cake Layer

Filtration performance and fouling behavior of a five-bore hollow fiber membrane was investigated in a membrane bioreactor (MBR) treating printing and dyeing wastewater. A normal single-bore hollow fiber membrane module was used in the same bioreactor for comparison. During an operation over 30 days, the results of chemical oxygen demand (COD) and color removals demonstrated that the five-bore membrane was favorable for this wastewater treatment. The critical flux ( Jc) of the five-bore membrane and the single-bore membrane was determined at 21 and 15 L/(m2·h), respectively, using a flux-step method. During a steady running at sub-critical flux of 10 L/(m2·h) without cleaning for 50 days, the average increasing rates of trans-membrane pressure (TMP) for five-bore and single-bore membranes were 0.356 kPa/d and 0.444 kPa/d, respectively, indicating that the five-bore membrane had better fouling resistance. The total resistance values of five-bore membrane and single-bore membrane were 8.68 and 14.1 m−1, respectively. Scanning electron microscope (SEM) and atomic force microscope (AFM) results confirmed the cake layer resistance for five-bore membrane was much lower than single-bore membrane. It was expected that the membrane structure, especially the membrane diameter, influenced the anti-fouling property of five-bore membrane.

scholarly journals Preparation of Mn/Mg/Ce Ternary Ozone Catalyst and Its Mechanism for the Degradation of Printing and Dyeing Wastewater

2022 ◽  
Vol 9 ◽  
Author(s):  
Shuai Zhang ◽  
Huixue Ren ◽  
Kaifang Fu ◽  
Wenqing Cheng ◽  
Daoji Wu ◽  
...  
Keyword(s):  
Methyl Orange ◽  
Catalytic Oxidation ◽  
Removal Rate ◽  
Dynamic Test ◽  
Oxygen Demand ◽  
Dyeing Wastewater ◽  
Printing And Dyeing Wastewater ◽  
Treatment Conditions ◽  
Nano Alumina ◽  
Catalyst Dosage

The printing and dyeing wastewater produced by different dyes, as well as different printing and dyeing processes, have different components. These wastewater have high toxicity, high organic concentration, and deep chromaticity. Ozone catalytic oxidation is a very promising technical method for wastewater treatment. In this paper, Mn/Mg/Ce ternary catalyst was prepared, and the ozone catalytic oxidation treatment of actual and simulated printing and dyeing wastewater was performed to study the performance of four different carrier catalysts, namely, molecular sieve (MS), silica gel (SG), attapulgite (ATP), and nano alumina (Al2O3), by simulated dynamic test. The effects of reaction time, pH, and catalyst dosage on methyl orange degradation were studied. The results showed that under the optimum treatment conditions (120 min, pH 11, and 12.5 g/L catalyst dosage), the degradation rate of methyl orange reached 96% and the removal rate of the chemical oxygen demand of printing and dyeing wastewater reached 48.7%. This study shows that the treatment effect of ozone catalytic oxidation on printing and dyeing wastewater is remarkably improved after catalyst addition. This study provides a new choice of ozone catalyst for the degradation of printing and dyeing wastewaters in the future.

scholarly journals Application of polymeric ferric sulfate combined with cross-frequency magnetic field in the printing and dyeing wastewater treatment

2019 ◽  
Vol 80 (8) ◽  
pp. 1562-1570
Author(s):  
Shiguo Gu ◽  
Fei Lian ◽  
Kejun Yan ◽  
Wei Zhang
Keyword(s):  
Magnetic Field ◽  
Wastewater Treatment ◽  
Removal Rate ◽  
Oxygen Demand ◽  
Ferric Sulfate ◽  
Dyeing Wastewater ◽  
Printing And Dyeing Wastewater ◽  
Magnetization Intensity ◽  
Frequency Magnetic Field

Abstract Polymeric ferric sulfate (PFS) was pretreated with a self-made alternating frequency magnetic field for coagulation printing and dyeing (PD) wastewater treatment. The effects of PFS dosage, magnetization intensity, frequency, and time on the removal of chemical oxygen demand (COD), color and turbidity of PD wastewater were investigated. The results indicated that the magnetized PFS significantly improved the removal efficiency in wastewater treatment. When the initial COD, color and turbidity of printing and dyeing wastewater was 464 mg/L, 180 degrees, and 54.8 NTU respectively, the maximum removal rate of COD, color and turbidity was 87.9%, 80.1%, and 95.2% respectively, under the condition of cross frequency magnetic field magnetization PFS. Moreover, the PFS treatment combined with cross-frequency magnetic field could greatly reduce the pollution of iron ions released from iron-based coagulant during wastewater treatment. Characterization of magnetized PFS flocculant by fourier transform infrared spectroscopy, ultraviolet and visible spectrophotometry, and scanning electron microscopy suggested that magnetic crystal with larger size can be formed on the surface of PFS particles.

Investigation of Fuchsine Solution Degradation by DC Atmospheric Pressure Air Discharge Plasma

2011 ◽  
Vol 71-78 ◽  
pp. 2856-2859
Author(s):  
Shui Jiao Yang ◽  
Ai Hua Gao ◽  
Feng Qiu Wang
Keyword(s):  
Atmospheric Pressure ◽  
Discharge Plasma ◽  
Treatment Time ◽  
Solution Concentration ◽  
Degradation Efficiency ◽  
Efficient Technology ◽  
Solution Ph ◽  
Inorganic Species ◽  
Study Results ◽  
Air Discharge

In this study, results of degradation of fuchsine solution are presented by using direct current (DC) atmospheric pressure air discharge plasma. The maximum absorption at 542 nm was reduced from 10.376 to 0.062 after 15 minutes plasma treatment, corresponding to the reduction of fuchsine solution concentration from 100 mg/L down to 1.419 mg/L, which indicated that the degradation efficiency is as high as 98.51%. A notable decreasing of degradation efficiency caused from the adding of sodium carbonate suggests that free radical species is a main factor accounting for the fuchsine solution degradation. The experimental results also reveal that the solution conductivity was increased with treatment time, while the solution PH was decreased, which may show that large amount of inorganic species, such as NO3- and H+, were produced. Within the current paper, it can be concluded that the DC atmospheric pressure air discharge plasma is capable of an efficient technology for the degradation of dye wastewater.

scholarly journals Pretreatment of printing and dyeing wastewater by Fe/C micro-electrolysis combined with H2O2 process

2018 ◽  
Vol 2017 (3) ◽  
pp. 707-717 ◽  
Author(s):  
Yan Wang ◽  
Xianwei Wu ◽  
Ju Yi ◽  
Lijun Chen ◽  
Tianxiang Lan ◽  
...  
Keyword(s):  
Removal Rate ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Coefficient Of Determination ◽  
H2o2 Concentration ◽  
Dyeing Wastewater ◽  
Spectra Analysis ◽  
Printing And Dyeing Wastewater ◽  
Initial Ph ◽  
Cod Removal Rate

Abstract A novel iron-carbon (Fe/C) micro-electrolysis combined with H2O2 (ICMH) process was proposed to pretreat the printing and dyeing wastewater (PDW), using a micro-electrolysis filling. The effects of H2O2 concentration, reaction time, initial pH, and Fe/C dosage on chemical oxygen demand (COD) removal rate of PDW were optimized by response surface methodology (RSM). The maximum COD removal rate was approximately 77.65% after 186 min treatment, when the concentration of H2O2, initial pH and the dosage of Fe/C were 8.88 g/L, 1.5 and 837 g/L, respectively. Analysis of variance (ANOVA) showed a high coefficient of determination value (R2 = 0.9780). And H2O2 concentration and initial pH were the key factors to improve the treatment effect. UV-Vis spectra indicated that a significant blue shift at 220 nm, attributing that fused aromatic hydrocarbons were degraded effectively. 3D-EEM spectra analysis showed that the water samples of PDW mainly contained three kinds of organic matter: refractory fulvic acid, soluble microbial metabolites and aromatic proteins, and the degradation rate of these was 81.76%, 53.78% and 70.83%, respectively.

scholarly journals Algal-Bacterial Symbiosis System Treating High-Load Printing and Dyeing Wastewater in Continuous-Flow Reactors under Natural Light

Water ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 469 ◽  
Author(s):  
Chao Lin ◽  
Peng Cao ◽  
Xiaolin Xu ◽  
Bangce Ye
Keyword(s):  
Treatment Plant ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Aeration Rate ◽  
High Load ◽  
Natural Light ◽  
Dyeing Wastewater ◽  
Printing And Dyeing Wastewater ◽  
Bacterial Symbiosis ◽  
Continuous Flow Reactors

This study investigated the symbiotic structure relationship between mixed algae andactivated sludge while treating high-load printing and dyeing wastewater under natural light. Theeffects of hydraulic retention time (HRT) (12 h, 16 h and 20 h) and aeration rate (0.1–0.15, 0.4–0.5and 0.7–0.8 L/min) on algal–bacterial symbiosis (ABS) and conventional activated sludge (CAS)systems. Experimental results showed that the ABS system exhibited the best removal performancefor chemical oxygen demand (COD), ammonia nitrogen (NH4+-N) and total phosphorus (TP),which was increased by 12.5%, 23.1% and 10.5%, respectively, and reduced colour 80 timescompared with the printing and dyeing wastewater treatment plant. Algae growth could bepromoted under lower dissolved oxygen (DO), and the addition of algae could provide more DO tothe ABS system. The particle size distribution of sludge in the ABS system was stable, whichguaranteed a stable treatment effect. In addition, the COD and colour could be further degradedunder the conditions of no external carbon source and longer HRT. It is expected that the presentstudy will provide a foundation for the practical application of the ABS system, and new insightsfor the treatment of printing and dyeing wastewater.

REMOVAL OF DYE AND CHEMICAL OXYGEN DEMAND (COD) REDUCTION FROM TEXTILE INDUSTRIAL WASTEWATER USING HYBRID BIOREACTORS

2014 ◽  
Vol 13 (1) ◽  
pp. 43-50 ◽  
Author(s):  
Ghasem Najafpour Darzi ◽  
Reza Katal ◽  
Hossein Zare ◽  
Seyed Omid Rastegar ◽  
Poorya Mavaddat
Keyword(s):  
Chemical Oxygen Demand ◽  
Industrial Wastewater ◽  
Oxygen Demand ◽  
Cod Reduction
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