Printing Wastewater Research Articles

Insight into simultaneous urea hydrolysis and total nitrogen removal in textile printing wastewater: Focus on the impact of sodium sulfate salinity

The textile printing industry discharges large volumes of effluent containing high concentrations of urea and nitrogenous compounds. Anoxic-oxic (AO) treatment is a promising method for treating printing wastewater. However, the effect of sodium sulfate (Na2SO4) salinity on the urea hydrolysis and nitrogen removal simultaneously in the AO process has received little attention. In this study, five batch reactors were used to treat synthetic printing wastewater with high urea and nitrogen concentrations. A strategy was applied to increase the Na2SO4 concentration from 0 to 19 g/L in the anoxic stage of each reactor. The effect of Na2SO4 on urea hydrolysis, total nitrogen removal and COD removal, sludge characteristics, and bacterial community structure were investigated. The findings showed that urea hydrolysis increased with increasing Na2SO4 concentration. The main mechanism of urea removal was intracellular hydrolysis, with a urea removal efficiency (URE%) of approximately 98% in all batch reactors. In addition, under the stress of Na2SO4, the total nitrogen and COD removal performances were partially inhibited. The most significant removal performances after AO treatment were observed at 0 g/L Na2SO4, with nitrogen and COD removal efficiencies of 88% and 95%, respectively. When Na2SO4 concentration reached 19 g/L, the sludge settling performance and compactness were enhanced. The extracellular polymeric substance (EPS) components in the sludge were dependent on their ability of removing organics. Bacterial community diversity analysis revealed that the enrichment of the Proteobacteria, Firmicutes, and Gemmatimonadota phyla in the anoxic stages of batch reactors was related to intracellular urea hydrolysis. Bacteriodota and Chloroflexi were responsible for total nitrogen removal in all anoxic and oxic stages. This research will develop the understanding of Na2SO4 salinity impact on simultaneous urea hydrolysis and nitrogen removal during AO treatment process.

Continuous flow combined with in situ self-assembly fabrication of high permselective ZIF-8@GO composite membrane in ceramic tube for organic dye nanofiltration

Nanofiltration holds promise for treating dyeing and printing wastewater on account of its key merits: low consumption, easy manipulation, and absence of secondary contamination. In this study, the fabrication of a uniform permselective ZIF-8@GO composite membrane in the alumina ceramic tube by the continuous flow combined with in situ self-assembly way was investigated. Subsequently, the properties of ZIF-8@GO membrane were examined in relation to reaction time, reaction temperature, flow rate, and GO concentration. Furthermore, the durability of the membrane was tested. It was observed that under optimal conditions, the rejection rate and permeation flux of methyl blue solutions remained essentially constant during 24 hours of continuous operation, with values of 98.39% and 38.27 L/(m2·h·bar), respectively. This work aims to simplify and smoothly implement the industrialized production of MOF-based composite membranes and offers a potential solution for the low-cost and efficient treatment of organic dye wastewater in the printing and dyeing industry.

Advanced Approaches in Dyeing and Printing Wastewater Treatment: A Comparative Study of Physical and Chemical Methods

This thesis presents a comprehensive analysis of various physical and chemical methodologies for treating dyeing and printing wastewater, which is a significant environmental concern in the textile industry. It delves into physical techniques like ultrafiltration, nanofiltration, reverse osmosis, and magnetic separation, evaluating their efficiency in removing contaminants and the challenges faced, such as membrane fouling and the requirement for high-quality magnetic seeds. The study also explores chemical methods like electrochemical oxidation and photocatalytic oxidation, highlighting the advancements in electrode materials and the use of TiO2 catalysts in degrading pollutants. A comparison is made between the effectiveness, operational constraints, and economic viability of these methods, emphasizing the need for optimizing existing technologies and developing hybrid systems that integrate the strengths of individual techniques. This research aims to contribute to the ongoing efforts on enhancing wastewater treatment efficiency, reducing environmental impact, and promoting sustainable practices in the textile industry. This work serves as a reference for future research on wastewater treatment, offering insights into developing more effective, cost-efficient, and eco-friendly solutions.

Assessment of The Bioremediation Potential of Selected Bacterial Species Isolated from the Textile Printing Wastewater Inoculated with Cow Dung

This study was conducted to isolate and identify bacteria from the wastewater of the textile printing industry inoculated with a mixture of cow dung, jaggery, and urea to assess the bioremediation potential of isolated bacterial species for reducing color and other polluting parameters of the wastewater. Based on colony characteristics, we were able to isolate nine types of bacteria (Pri 1 to 9), capable of thriving in textile printing wastewater. Out of the nine isolates examined, four (Pri 3, Pri 4, Pri 8, and Pri 9) significantly reduced the color and values of other physicochemical parameters of the wastewater. Isolated bacterial cultures were identified using various biochemical tests, antibiotic sensitivity tests, and rRNA sequence analysis. At the end of a 24-h incubation period at room temperature under shaking conditions at 100 rpm on an orbital shaker, isolate Pri 3 was identified as Alcaligenes aquatilis LMG 22996 (T), capable of reducing color by 86.13%, biological oxygen demand (BOD) by 70.44%, chemical oxygen demand (COD) by 80.65%, total dissolved solids (TDS) by 47.31%, total suspended solids (TSS) by 56.56%, and ammoniacal nitrogen by 75.95%; isolate Pri 4 as Priestia aryabhattai B8W22(T), capable of reducing color by 78.35%, BOD by 66.35%, COD by 74.92%, TDS by 34.94%, TSS by 31.66%, and ammoniacal nitrogen by 71.14%; isolate Pri 8 as Citrobacter werkmanii NBRC 105721(T), capable of reducing color by 90.37%, BOD by 82.13%, COD by 85.06%, TDS by 54.83%, TSS by 61.97%, and ammoniacal nitrogen by 80.76%; and isolate Pri 9 as Shewanella chilikensis JC5(T), capable of reducing color by 90.17%, BOD by 84.68%, COD by 83.46%, TDS by 59.13%, TSS by 62.45%, and ammoniacal nitrogen by 90.37%.

Eminent destruction of organics and pathogens concomitant with power generation in a visible light-responsive photocatalytic fuel cell with NiFe2O4/ZnO pine tree-like photoanode and CuO/Cu2O nanorod cathode

Environmental conservation and energy scarcity have become two core challenges with the ever-increasing advancement of industry, particularly chemical energy rich wastewater comprising refractory organics and pathogenic microbes. Here, a multifunctional photocatalytic fuel cell (PFC) was devised using NiFe2O4 nanoparticle-loaded on pine tree-like ZnO/Zn (NiFe2O4/ZnO/Zn) photoanode and CuO/Cu2O nanorods-loaded on Cu (CuO/Cu2O/Cu) cathode for extracting electricity upon wastewater treatment. When fed with Rhodamine B (RhB) dyestuff, the NiFe2O4/ZnO/Zn-PFC provided the maximum power density (Pmax) of 0.539 mW cm−2 upon visible light irradiation with an average RhB degradation of 85.2%, which were 2.8 and 2.7 times higher than ZnO/Zn, respectively. The remarkable enhanced NiFe2O4/ZnO/Zn-PFC performance was owing to the synergistic effect of pine tree-like structure and Z-scheme heterostructure. The pine tree-like with high surface area was not only for effective harnessing photon energies but also provided more directional routes for rapid segregation and transport of carriers and higher interface contacting areas with electrolyte. Through a series of systematic characterizations, the Z-scheme heterostructure mechanism of the system and organics degradation pathway were also speculated. Additionally, the performance of the NiFe2O4/ZnO/Zn-PFC in industry printing wastewater showed Pmax of 0.600 mW cm−2, which was considerably impressive as real wastewater was challenging to accomplish. The phytotoxicity outcome also manifested that the comprehensive toxicity of RhB was eradicated after PFC treatment. Lastly, the excellent recyclability and the pronounced bactericidal effect towards Escherichia coli and Staphylococcus aureus were other attributions which enabled the NiFe2O4/ZnO/Zn-PFC for possible practical application.

Novel cetyltrimethylammonium bromide modified mixed adsorbent for efficient treatment of dyeing and printing wastewater

The treatment of dyeing and printing wastewater is a formidable challenge due to its high chemical oxygen demand (COD) and chromaticity, which pose severe threats to both the environment and human health. In this study, a composite modified adsorption material was prepared based on the applicability and feasibility in practical engineering applications. A novel mixed modified adsorbent was developed by incorporating activated carbon and activated clay as the foundation materials, followed by the addition of cetyltrimethylammonium bromide (CTAB) for modification. The performance of the composite adsorbent was evaluated via adsorption experiments of bromophenol blue (BPB) solution and dyeing and printing wastewater. The results demonstrated that the mixed modified adsorbent achieved a remarkable removal rate of 99% for BPB and 99.3% for chromaticity, under the optimal adsorption conditions. Furthermore, the regeneration performance of the mixed modified adsorbent was found to be exceptional. The adsorption process of BPB by the composite adsorbent was governed by the quasi-second-order kinetic model and Freundlich isotherm model, as evidenced by adsorption kinetics and isotherm analyses. The straightforward preparation method, coupled with the superior adsorption performance, underlines the promising potential of the proposed composite adsorbent for practical applications.

Preparation of lotus-leaf-like carbon cathode for the electro-Fenton oxidation process: Hydrogen peroxide production, various organics degradation and printing wastewater treatment

To develop an electro-Fenton (EF) oxidation process for highly efficient organics degradation, a carbon cathode with lotus-leaf-like super-hydrophobic surface was prepared using ordinary graphite powder as an electro-catalyst material, polytetrafluoroethylene (PTFE) as an adhesive agent, boric acid (H3BO3) as a pore-forming agent, and using copper wire meshes to shape the surface morphology. The obtained results show that the carbon cathode with a lotus-leaf-like morphology led to an evident increase in hydrophobicity, which greatly enhanced hydrogen peroxide (H2O2) production performance. In the air-aerated Na2SO4 solution (pH = 2.8), the cathode prepared under optimized conditions yielded 527.5 mg L−1 H2O2 within 60 min with an observed current efficiency (CE) of 35.1 %. The developed EF oxidation process exhibited the strong oxidation ability for the degradation of several organics including rhodamine B (RhB), methylene blue trihydrate (MBT), p-nitrophenol (p-NP) and tetracycline (TC). What's more, the treatment of one real printing wastewater by this EF system presented the chemical oxygen demand (COD) removal of 76.8 % and the total organic carbon (TOC) removal of 73.5 %, and concurrently enhanced the biodegradability evidently. In addition, it was found that chloride ion (Cl−) might have an adverse effect on organics degradation due to the meaningless H2O2 consumption caused by HClO and ClO−. The results of this study indicate that the developed EF process can be used not only for the efficient removal of organic pollutants, but also as a pre-treatment before biological treatment for the enhancement of biodegradability.

Synergistic effect of Fenton oxidation and adsorption process in treatment of azo printing dye: DSD optimization and reaction mechanism interpretation

ABSTRACT The main challenges to overcome within the Fenton process are the acidic pH as an optimal reaction condition, sludge formation in neutral pH medium and high toxicity of treated printing wastewater due to the generation of contaminating by-products. This research discusses the catalytic activity of homogeneous (FeSO4/H2O2) and heterogeneous (Fe2(MoO4)3/H2O2) Fenton processes in treatment of Yellow azo printing dye in synthetic aqueous solution and real printing effluent, with an integration of adsorption on functionalized biochar synthesized from wild plum kernels. The definitive screening design (DSD), was used to design the experiment. Independent variables were initial dye concentration (20–180 mg L−1), iron concentration (0.75–60 mg L−1), pH (2–10) and hydrogen peroxide concentration (1–11 mM). Higher decolourization efficiency of 79% was obtained within homogeneous Fenton treatment of printing wastewater, in comparison to heterogeneous Fenton treatment (54%), after a reaction time of 60 min. Same trend of mineralization degree was established: COD removal was 59% and 33% for homogeneous and heterogeneous Fenton process, respectively. The application of adsorption treatment has achieved significant advantages in terms of toxicity reduction (95%) and decolourization efficiency (90% of TOC removal and 22% of dye removal) of treated samples, even at neutral pH medium. Degradation mechanisms within Fenton and adsorption processes were proposed based on the qualitative gas chromatography/mass spectrometry analysis, physico-chemical properties of dye degradation products and functionalized biochar. Overall, the homogeneous Fenton/adsorption combined process can be potentially used as a treatment to remove azo dyes from contaminated water.

Printing performances of a new nitrogen-free urea substitute in silk printing of reactive dyes

A new printing additive, GBPA, which is composed of glycerol and 1,4-butanediol, was used in silk printing with reactive dyes. The printing performance of GBPA in the reactive printing of silk fabrics was studied and compared with those of urea. The results showed that in deep printing of Reactive Turquoise K-GL on silk satin, GBPA obtained as stable a color performance as urea at dosages ranging from 8 wt% to 10 wt% in the printing paste. Using a range of thickeners, GBPA exhibited the same color level as urea when using sodium alginate as thickener. Using reactive blue dyes of various structures and reactive dyes of different colors, the color performance of GBPA was close or even superior to that of urea. Furthermore, GBPA achieved good printing performances on different silk fabrics. By using GBPA in reactive printing, the nitrogen content in the printing wastewater greatly reduced. GBPA has great application potential as an alternative to urea in silk printing with reactive dyes.

Microbial community and performance of a partial nitritation/anammox sequencing batch reactor treating textile wastewater

Implementation of onsite bioremediation technologies is essential for textile industries due to rising concerns in terms of water resources and quality. Partial nitritation-anaerobic ammonium oxidation (PN/A) processes emerged as a valid, but unexplored, solution. In this study, the performance of a PN/A pilot-scale (9 m3) sequencing batch reactor treating digital textile printing wastewater (10–40 m3 d−1) was monitored by computing nitrogen (N) removal rate and efficiencies. Moreover, the structure of the bacterial community was assessed by next generation sequencing and quantitative polymerase chain reaction (qPCR) analyses of several genes, which are involved in the N cycle. Although anaerobic ammonium oxidation activity was inhibited and denitrification occurred, N removal rate increased from 16 to 61 mg N g VSS−1 d−1 reaching satisfactory removal efficiency (up to 70%). Ammonium (18–70 mg L−1) and nitrite (16–82 mg L−1) were detected in the effluent demonstrating an unbalance between the aerobic and anaerobic ammonia oxidation activity, while constant organic N was attributed to recalcitrant azo dyes. Ratio between nitrification and anammox genes remained stable reflecting a constant ammonia oxidation activity. A prevalence of ammonium oxidizing bacteria and denitrifiers suggested the presence of alternative pathways. PN/A resulted a promising cost-effective alternative for textile wastewater N treatment as shown by the technical-economic assessment. However, operational conditions and design need further tailoring to promote the activity of the anammox bacteria.

Properties of a new nitrogen‐free additive as an alternative to urea and its application in reactive printing

AbstractThe development of a urea substitute with little nitrogen has become a hot research topic for cleaner production in reactive printing. In the current study, a mixture made from glycerol and 1,4‐butanediol (1:1, w/w), namely, urea substitute glycerol butanediol (USGB), was used instead of urea in the printing paste formulation. USGB’s abilities of moisture adsorption, swelling fibres and solubilisation to reactive dyes were compared with those of urea. The printing properties of USGB on different fabrics with reactive dyes were intensively investigated in comparison with urea and commercial 391‐H. The results showed that USGB’s ability to swell viscose fibres was superior to that of urea. When the dosage of USGB was within 8‐10 wt% in the printing paste, the colour yield of USGB on viscose fabrics drew near to that of urea and was higher than that of 391‐H. During viscose printing of reactive blue dyes with different shades and structures, the colour performance of USGB was close to that of urea and higher than that of 391‐H. Furthermore, USGB could obtain good printing effects in deep printing with Reactive Turquoise K‐GL on different fabrics. Compared with urea, the content of ammonia‐nitrogen and total nitrogen in the printing wastewater using USGB were greatly reduced, which is of huge significance for lowering ammonia‐nitrogen emissions in the printing industry.

Efficient removal of ammoniacal nitrogen from textile printing wastewater by electro-oxidation considering the effects of NaCl and NaOCl addition.

In this study, an electro-oxidation (EO) process using graphite electrodes as electrode pairs was used for the removal of chemical oxygen demand (COD), ammoniacal nitrogen (NH4+-N), and color from real textile printing wastewater. The effects of solution pH, sodium chloride (NaCl) dosage, sodium hypochlorite (NaOCl), which is the oldest and still most important chlorine-based bleach, dosage, and oxidation time were investigated on the removal efficiencies. Operating conditions for the EO reactor were applied to current density 1 mA/cm2, distance between the electrodes: 2 cm, 150 min operation time, and stirring speed of 500 rpm. At optimum conditions: pH 9.5, applied current density 1 mA/cm2, NaCl dosage of 8 g/L, NaOCl dosage of 44.4 mg/L and 150 min electro-oxidation time, the obtained removal efficiencies were 86.5% and 91.1% for chemical oxygen demand (COD) and ammoniacal nitrogen, respectively. Efficiency was increased to 91.1% for ammoniacal nitrogen from 21.7% after applying EO combined with NaOCl addition compared to individual NaOCl addition.

The effect of mixing speed and contact time on the process of dye adsorption using corncobs adsorbent

The home screen printing industry generally discharges wastewater directly into drainage without being processed first. By utilizing corncobs waste will reduce the amount of waste in the environment. The purpose of this study is to find out the optimum removal efficiency using corncobs in the removal of dyes. The manufacture of adsorbents using corncobs was dried and carbonized using a kiln to become charcoal powder. After the carbonization process, activated it using H2SO4. The dye adsorption process was carried out with variations in speed of 50, 75, 100, 125, and 150 rpm, variations in contact time of 0, 30, 45, 60, 90, and 120 minutes. From the results of this study it was found that the optimum conditions with a dye removal efficiency of 99.98% were obtained when the mixing speed was 100 rpm, contact time was 60 minutes, and the adsorbent dose was 10 g / L. From these results it can be said that the corncobs adsorbent is effective in removing the screen printing wastewater dye.

Study on printing wastewater treatment by decomposition reaction H<sub>2</sub>O<sub>2</sub> catalyzed of complex between ion Ni<sup>2+</sup> and citric acid

In this article, the results of the research on organic pollutant treatment in the wastewater of printing processes on fabric by H2O2 under the catalytic role of the complex between ion Ni2+ and Citric acid (H4L) were presented. The condition of pH, H4L/Ni2+, H2O2, Ni2+ concentration has been explored to get the optimal conditions for improving COD efficient treatment. The results provide the solutions of the homogeneous complex catalysts in the industrial wastewater treatment at room temperature and atmosphere.

Rejection of antimony in dyeing and printing wastewater by forward osmosis

Wastewater containing heavy metal antimony (Sb) from textile and printing industry has high potential toxicity to environment and human health. In this study, forward osmosis (FO) technology was firstly used to remove Sb from both model Sb wastewater and real dyeing and printing wastewater. The evaluation of FO performance with different feed solution pH and NaCl concentration indicated that the water flux and reverse salt flux were proportional to both the feed solution pH and NaCl concentration. The rejection of Sb decreased with NaCl concentration while increased with feed solution pH. The addition of Cr (VI) as co-existing ions in the feed further increased Sb removal for a range of feed solution pH and NaCl concentration. FO process exhibited high removal efficiency for Sb (>99.7%) and other water quality parameters (TN, TP, NH3-N, SS, COD and TOC) when it was applied for the treatment of real dyeing and printing wastewater. The mass balance of Sb in FO process was also analyzed to investigate the membrane fouling and rejection mechanism.

Microfiber from textile dyeing and printing wastewater of a typical industrial park in China: Occurrence, removal and release

Microfibers (MFs) are fibrous micro particles of longitude <5 mm, including natural fibers and fibrous microplastics. Microplastic pollution has become a world issue. As the major section of fiber production and processing, textile industry is an important potential source of microfibers, while receiving limited attention. To better understand the source and fate of textile microfibers, in this study, a typical textile industrial park in China is selected as the studying site. Microfibers in textile wastewater from typical textile mills and centralized wastewater treatments plants (WWTPs) of the park, and microfibers in nearby surface water were identified and characterized. The main results showed that the microfiber concentration in textile printing and dyeing wastewater could reach as high as 54,100 MFs/L. Although the removal efficiencies of microfibers by existing wastewater treatment processes can be over 85%, the average microfiber concentration in the effluents from the centralized WWTPs of the industrial park still reached 537.5 MFs/L, releasing 430 billion microfiber items per day. Microfiber release from textile wastewater is considerably higher than that from municipal sewage treatment plants, making it a significant contributor to microfibers in natural water bodies. Small-sized and colored microfibers increased in proportion in the treated effluents. Given the complex textile wastewater constituents, the potential negative environmental impacts of textile microfibers may be intensified by the enhanced adsorption and transfer of textile pollutants through these microfibers.

Effect of Calcination Temperature on the Performance of Pd-Based Catalysts

It is difficult to biodegrade organic waste-water, which is treated by catalytic wet oxidation method. The catalyst Pd-Fe-Co-Ce/FSC (ratio 1:1:1:3), and the calcination time was 3 h, and the calcination temperatures were set to 400, 550, 700, and 850 °C, respectively. When the calcination temperature was 550 °C, the experimental results show that: when Pd-Fe-Co-Ce/FSC (ratio 1:1:1:3) is added with, the pH of wastewater is reduced, and then the pH will rise again; the Pd-Fe-Co-Ce/FSC (ratio 1:1:1:3) catalyst has good decolorization effect at 4 calcining temperatures, which can reach 92.7% - 97.9%, and 36.6% - 41.8% higher than the blank without catalyst; the best treatment effect is when the calcination time is 3 h and the calcination temperature is 550 °C. The addition of Pd-Fe-Co-Ce/FSC (ratio 1:1:1:3) after treatment of printing waste-water, its COD removal rate increased significantly, and the final effluent percentage reached 71.7% - 88.8%.

Screening of Homogeneous CWAO Catalysts for Treatment of Ceramic Printing Waste-Water

The ceramic printing and dyeing waste-water was treated by catalytic wet oxidation. The catalytic oxidation reaction was carried out under the conditions of 50 mg/L metal ion concentration, 180 °C of reaction temperature, 2.5 MPa of oxygen partial pressure and 500 rpm of stirring speed, and the time of catalytic oxidation was set at 90 min. Comparing the effect of structural auxiliaries and blank group on COD removal rate of effluent, the structural auxiliaries have no effect on effluent, that is, no catalytic effect; Comparing the blank group without adding catalyst, the copper nitrate has the highest cod removal rate of 72.5% for waste-water, so it can be used as the best homogeneous catalyst to treat waste-water. The order of catalytic effect from high to low is: Cu(NO3)2 > CuSO4 > Fe(NO3)3 > Fe2(SO4)3 > Co(NO3)2 > Cr(NO3)3 > Ni(NO3)2 > AgNO3 > Zr(NO3)4. Among the nine types of homogeneous catalysts, the most effective Cu(NO3)2•H2O catalyst treated the ceramic printing and dyeing waste-water, the COD decreased from 3775 mg/L to 1038 mg/L and the COD removal rate reached 72.5%, when the catalyst was not added under the same operating conditions. The COD removal rate of water samples was increased by 32.9%.

Research on the Stability of Catalysts Characterized by TG-DTA and ICP

The stability of the catalysts can be verified by the experimental characterization before and after using. In this study, the reusability of Ru and Pd catalysts were investigated in the CWAO process for the treatment of refractory ceramic printing wastewater. By comparing the TG-DTA curves of Ru catalysts after the first, second and third use, the TG curve showed that the mass of the catalyst changed with the temperature. The curve of DTA (Differential Thermal Analysis) showed no significant difference between the endothermic peak and exothermic peak. The DTG curve, combined with the TG curve, represents the endothermic/exothermic state at a certain temperature. Meanwhile, it can also explain the changes of the sample, such as dehydration, decomposition, oxidation, etc., and the curve changes are not obvious during three USES. This shows that the catalyst has good stability. ICP data, concentration difference of Fe, Co, Ce and Ru were 0.261,1.177, 0.614,0008 mg/L, respectively. ICP data, concentration difference of Fe, Co, Ce and Ru in three times of use of Pd catalyst were 0.547,0.067, 0.099 and 0.00008 mg/L, respectively. TG-DTA and ICP were used as the characterization methods, and the dissolution concentration of metal ions was used as the evaluation index of catalyst stability. The results show that the Ru-catalysts and Pd-catalysts have good catalytic stability.

Study on the Performance of Ru Catalyst Based on the Treatment of Refractory Biodegrading Organic Wastewater

Supported metal catalysts are widely used in the field of refractory biodegrading wastewater treatment because of their unique catalytic performance. The non-homogeneous CWAO process is used to treat the refractory biodegrading ceramic printing wastewater. The pH, decolorization rate and COD removal rate of water sample are used as the evaluation indexes of catalyst activity, and the metal dissolution concentration is used as the evaluation indexes of catalyst stability. Then the performance of the catalyst is evaluated comprehensively. As the reaction time goes on, decolorization rates of water samples with different groups of Ru catalyst increase. The decolorization rate of CWAO method for wastewater treatment reaches 80.4%, 78.3% and 76.7% respectively, indicating that the activity and stability of this catalyst are good. The overall trend of pH value of water sample from the first time, the second time and the third time is slightly higher, because generally printing and dyeing wastewater is alkaline, the higher the pH value of water sample indicates the lower the water sample treatment efficiency, that is, the catalyst catalytic efficiency has declined. From the first, second and third use sequence, the COD of water samples are all over 74.0%, and the COD removal rate is gradually reduced. The results show that the Ru-Fe-Co-Ce/FSC (ratio 2:0.5:0.5:3) catalyst has good catalytic activity and stability.