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Objective: To determine the effects of textile dyeing industrial wastewater on the hematological parameters and reproductive health including histoarchitecture of male gonad (testes) of mice. Methods: Twenty-four Swiss albino mice at 4-weeks old were divided into four groups (n=6 per group). Mice of group 1 supplied with normal drinking water were served as the control group. Mice of group 2, 3 and 4 were supplied normal drinking water mixed with textile dyeing wastewater at 5%, 10% and 20% concentration, respectively. After completing 24 weeks of treatment, different hematological profile, weight of testes, gonadosomatic index (GSI), sperm concentration and morphology were measured. Moreover, histopathological changes in testes were examined. Results: Hematocrit value and hemoglobin concentrations were decreased in all groups of wastewater-treated mice compared to the control group. Likewise, weight of testes, GSI and sperm concentration were decreased significantly in wastewater-treated mice in comparison to the control group. The percentage of morphologically healthy epididymal sperm was significantly reduced in wastewater-treated mice. Histopathological examination revealed degenerative changes in seminiferous tubules, a smaller number of spermatogenic cells, elongation of seminiferous tubules and degenerative changes of seminiferous tubules in wastewater- treated mice. Conclusions: Textile dyeing wastewater has harmful effects on hematological profile and reproductive health of male mice.

Textile printing and dyeing industry is one of the industrial industries with the largest discharge of wastewater and pollutants. It is also featured by energy-intensive and high-carbon emission characteristics. Low-carbon wastewater treatment has become an important path for sustainable development. Based on the analysis of the greenhouse gas emission characteristics of printing and dyeing wastewater treatment process, the concept of carbon emission potential in terms of used dyes was proposed. To address the complexity and variability of wastewater treatment process and wastewater quality, an accurate estimation method of carbon emission in wastewater treatment process was established according to carbon and nitrogen mass balance. The progress and development direction of low-carbon treatment technology for textile printing and dyeing wastewater were summarized in this paper.

Dyeing wastewater has the problems of complex composition, deep color and difficulty in degradation, which seriously threaten the ecological environment. This study investigated the Ni2+/peroxymonosulfate (PMS)/MXene system for efficient degradation of the dyeing wastewater with lower metal consumption. The reactive red 24 (RR24) simulated dyeing wastewater was used as the research object. The influences of mass concentrations of PMS, Ni2+, MXene and RR24, and initial pH values on RR24 degradation were explored. The contribution of free radicals in the degradation of dyes was investigated by free radical quench experiments. The results showed that the degradation percentage of RR24 was as high as 96. 62% using a mixture of 7. 5 g/L PMS, 100 mg/L Ni2+ and 210 mg/L MXene at 25°C for 60 min. Under neutral conditions, compared with the system without Ti3C2 MXene, the degradation percentage of RR24 increased by 2. 04 times. In this system, the · OH radical played a dominant role. When the dyeing wastewater was treated by using the Ni2+/PMS/MXene system, the inorganic salts significantly altered the degradation rate of the dyeing wastewater, but only slightly affected the final degradation percentage. [ABSTRACT FROM AUTHOR]

Metal organic frameworks(MOFs),as non-homogeneous Fenton oxidation catalysts,are difficult to be utilized multiple times and prone to secondary pollution in the treatment of printing and dyeing wastewater. To solve this problem, metal organic framework polypropylene melt blown composites (TA-APTES@MOF@PP) were prepared by modifying the surface of polypropylene melt blown nonwoven (PP) with polyphenol heterogeneous network coating, which resulted in excellent adhesion and secondary reactivity,and by in situ growth of MIL-88B (Fe) crystals on its surface. The catalytic degradation effect and recycling performance of the composites were tested with methylene blue dye (MB) as the target pollutant,and the catalyst delivery ratio and optimal reaction conditions were determined by single-factor optimization. The results showed that the degradation of MB by TA-APTES@MOF@PP (MOF 20 mg) under dark conditions was optimal at 3 h with a degradation rate of 95.3% when the pH of dye solution was 3 and the H2O2 concentration was 50 mmol/L. The composite material has no secondary pollution,easy to recycle, good stability, acid and alkali resistance, catalytic effect in the pH range of 2-11 of dying solution, and the 3 h degradation rate was still above 73.4% after 5 cycles. The composite material had a broad application prospect in printing and dyeing wastewater treatment and water environment management.

Objectives Since 2016, TOC (Total Organic Carbon) has replaced COD (Chemical Oxygen Demand) as an organic indicator for effluent wastewater quality standards. However, the distribution of organic substances by process in wastewater treatment facilities is not properly identified, making it difficult to secure stable treated wastewater quality. Therefore, in this study, we identified the correlation between TOC and existing organic matter indicators in raw wastewater, primary treated, secondary treated, and effluent wastewater for dyeing wastewater. Methods Samples for each process were collected twice a week, a total of 24 times, from a dyeing wastewater treatment plant located in Y-city, Gyeonggi-do, and organic pollutant indicators (TOC, CODCr, CODMn, BOD5) were analyzed. TOC was analyzed by the NPOC (non-purgeable organic carbon) method using TOC-VCHP (Shimadzu, Japan). Using the analysis results, the characteristics of organic pollutants in dyeing wastewater were analyzed. In addition, multivariate statistical analysis was performed using SPSS to analyze correlations between organic pollutant indicators and principal component analysis. Results and Discussion As a result of multivariate statistical analysis, TOC was inflowed at an average of 574.9 mg/L and treated at 58.2mg/L. In the case of CODCr, CODMn, and BOD5, the inflow was 1,644, 448.9, and 440.7 mg/L and was treated at 98.2, 39.7, and 10.8mg/L. When evaluated based on effluent water quality standards, all of them satisfied the Region III standards, but were discharged at a relatively high level compared to the TOC concentration of sewage treatment plants effluent. As a result of comparing correlations between organic matter indicators through Pearson correlation analysis, the inflow raw water shows a high positive correlation with TOC:TCODCr (r=0.720), TOC:TCODMn (r=0.636), and TOC:TBOD5 (r=0.302) showed low correlation. This is reason to be due to the fact that most organic substances in dyeing wastewater are non-degradable substances and have low biodegradability. As a result of principal component analysis of influent, primary treated, and final treated, three main components each (two for final treated) were extracted, with cumulative contribution rates of 80.1%, 83.2%, and 95.6%. Conclusion Because the properties of wastewater differ greatly depending on the type of leather and chemicals handled at the dyeing factory, the correlation between influent water was low, but the correlation between treated water and treated water was relatively high. The correlation between processes in wastewater treatment facilities also tended to increase toward later processes. It is believed that the above statistical analysis can be used as basic data for effective organic matter management.

The treatment or resource utilization of high-salinity wastewater from printing and dyeing has received great attention in recent decades due to their negative impacts on the surrounding environment. To improve the direction of research, we analyzed the published papers in the online version of the Science Citation Index Expanded database for 1991–2022—a total of 1090 articles or reviews—using VOSviewer, Python, origin 2023, and the statistical software R. The results showed that the published papers in this field have increased exponentially in the past 17 years. The Journal of Membrane Science, Desalination, the Chemical Engineering Journal, and the Journal of Hazardous Materials are the most important for publishing relevant research. Van Der Bruggen B was the most productive author. Katholieke University Leuven and Donghua University were the main research institutions. There were additional needs to enhance collaboration relationships between different authors, institutions, and countries. At present, research focused on methods that are closer to “real” field or ground conditions, “photocatalysis,” “loose nanofiltration membranes”, and “dye/salt separation” are the research frontier. The present study determines the trends of this field of research by visualizing the current landscape to facilitate future collaborative research.