Revista Bionatura
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Study pathological changes to evaluate efficient treatment of industrial dyes in wastewater

     Sarab Ridha Mustafa*1, Hadeer A.A.2, Vian  Ali3, Suha Abdul Hakeem Ali4
1  Ministry of Science and Technology;[email protected]. Irak
2 Al-Isra'a University College. Irak
3 Ministry of Agriculture. Irak
4 Ministry of Science and Technology, Irak
* Correspondence: [email protected]
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There is an increase in concern about the effects of environmental dangers on health related to toxic pollutants resulting from industrial activities, which are released into the aqueous environments in the whole world. Industrial dyes represent one of the major groups of toxic compounds used in different industries, including textile and leather. Releasing dyes into the water could cause vicious effects on the aqueous environment. This experiment aims to evaluate the efficiency of chemical treatment by Nano zero-valent iron (NZVI) of textile dye to investigate the histopathological effects in the liver, kidneys, and intestines of albino mice using histopathological diagnosis.
Three groups of mice were exposed. The control group was given tap water, the second group was assigned untreated textile dye solution (acid red 315) at a concentration of (100)ppm, and the third group was given treated textile dye solution. Histopathological alterations were evaluated after 2 months from exposure. The results from treated dyes showed no histopathological changes. In contrast, untreated stains showed histopathological changes in all organs, represented by dilation of sinusoids and congestion of blood vessels and hydropic degeneration, necrosis and aggregation of inflammatory cells in the liver. In contrast, in the intestine, there is edema between mucosa and submucosa, degeneration and necrosis in the intestinal mucosa, atrophy in the muscular layer, and inflammatory cell aggregation in the submucosa and mucosa of the intestine. We conclude that the treatment of textile dye is sufficient and decreases its effect.   
Keywords: Histopathological alteration, Efficient evaluation, Textile dye acid red 315

The textile industry is reported to be a vital, joint and essential industry sector in the world and plays a distinguished role in the nation's economy 1 and is considered a source that emerged in the 18th century as a mass production and became an important industry. The dye industry has been considered an essential source of water pollution because dyes are highly colored and resist degeneration. Workers in the textile industry are exposed to many different types of toxic dyes, bleaching agents, acids, alkaline and heavy metals like cadmium, chromium and iron, and also possibly exposed to carcinogenic compounds such as solvents and fixatives during the printing process of dyes on textile2. Most of the time, water from the textile dye industry, which is less than 10%, is treated, and the remainder is released into the drains and shallow pools untreated, causing a severe pollution problem 3. The final disposal of the treated dyes remains a challenge, and the ecto-taxological evaluation is essential to minimize environmental pollution; 10-15 % of the stains are released into the environment throughout the dying process and are considered carcinogenic and mutagenic 4. Large numbers of animals, including cattle, drink contaminated water because of the lack of access to safe water, and accidental pool drinking results in calf mortality 5. The toxicity of Azo dyes based on benzidine and congeners can cause bladder cancer in humans. Toxic effects were reported in several exposed species, including humans6, monkeys, rodents and dogs7. The study aimed to evaluate the efficient treatment of industrial dyes in wastewater.


consist of ten mice (five female and five male). The experiment persisted for two months. Mature Swiss albino mice (age 50-55 days), weighting 25-30 g, were housed in plastic cages of (60*10*10) cm3 dimension, well ventilated, temperature 25± 3 C°, 12h light-dark cycle and feed slandered rodent diet provided by the department of pharmaceutical control/ branch of experimental animals and drinking water were given. Animals were divided into three groups, including the control group, the untreated dye solution group and the treated dye solution group. Each group

Preparation of stock solution and exposure details
Azo dye acid red 315 (Figure. 1) used in this study was obtained commercially from the local source and directly used for experimental purposes. We prepared a 100 ppm concentration of azo dye and then treated it with zero iron in the chemical laboratory of the environmental and water directorate/Ministry of Science and Technology.

Histopathological studies
Specimen of organs (liver, kidneys, lungs, brain, spleen and intestine) were collected from all animals after killing immediately and washed with normal saline and then fixed in 10% neutral buffered formalin for 48 hours at least for histopathological diagnosis

Figure 1. Chemical Structure of Acid Red 315 C20HI9N3Na2010S3,M.W 603.56 in the Study


The result of this study showed histopathological alteration, as in Table (1). Histopathological responses have commonly been used as effective biomarkers for evaluating the effects of pollutants on health.
Table 1.The results of histopathological alteration

Histopathology of liver
The liver is associated with the detoxification and biotransformation process, and due to its function, position and blood supply, it is also one of the organs most affected by contaminants in the water 8. Gil and Cemek 9 reported that azo dyes are metabolized by azo reductase in the liver 10. The liver has a vital detoxification role of endogenous waste products and externally derived toxic chemicals or heavy metals11. Dilation of sinusoids and congestion of blood vessels, necrosis and aggregation of inflammatory cells and pycnotic nuclei, and hydropic degeneration changes agreed with our result after 2 months of exposure (Figures 2 and 3).
Also, Atamanal et al.12 show similar changes in rainbow trout exposed to copper sulfate. Abdel Moneim et al.13 observed cloudy swelling and mass and infiltration of inflammatory cells in the liver. Also, Hinton et al. 14 suggest that Hepatic necrosis and inflammation indicate toxic injury. Koca et al. 15 reported several histopathological alterations, such as swollen and ruptured parenchymal cells, loss of cord structure, vacuoles filled with cellular debris, focal necrosis and a significant increase in Kupffer cells in the liver due to metal accumulation. Results of the treatment group show no histopathological changes as in Figure 4.

Figure 2. Showing congestion with periportal  cuffing (before treatment)  

Figure 3. Showing liver with hydropic degeneration (before treatment)

Figure 4. Showing normal liver tissue
Histopathology of kidney
The kidney showed coagulative necrosis  (Figure 5)  and hydropic degeneration in renal tubules, shrinkage of glomerular tuft (Figure 6) similar to 17, which showed some detrimental changes like atrophy of glomeruli, and degeneration of renal Tubules kidney. Other researchers mention that the histopathological changes in the kidney after exposure to different dye concentrations might indicate kidney dysfunction or failure 13. Whereas in the group of mice exposed to textile dye solution after treatment, no histopathological alteration was seen (Figure 7).
Figure 5. Showing necrosis in renal tubules and shrinkage of glomerular tuft (before treatment)

Figure 6. Showing coagulative necrosis and hydropic degeneration in the tubules of the kidney (before treatment)  

Figure 7. Normal kidney tissue
Histopathology of intestine
The intestine is involved in the uptake of pollutants from the surrounding medium. The histological change in the intestine for mice exposed to 100 textile dyes after two months is edema between mucosa and submucosa (Figure 8), which may be attributable to degradation products, including toxic metabolites characterized as aromatic amines 18.

Figure 8. Showing edema between mucosa and submucosa, degenerative and necrotic

Figure 9. Showing hyperplasia in the lymph follicles of sub mucosa (before treatment).

Figure10. Showing intestine with no histopathological changes (after treatment)

Figure 11. Showing normal intestine


The study concludes that the chemical treatment of textile dye with nano zero-valent iron (NZVI) effectively reduces its toxicity and histopathological effects in albino mice. The untreated dye caused a variety of histopathological changes in the liver, kidneys, and intestine, including dilation of sinusoids and congestion of blood vessels, hydropic degeneration, necrosis, aggregation of inflammatory cells, edema, degeneration and necrosis of the intestinal mucosa, atrophy of the muscularis layer, and inflammatory cells aggregation in the submucosa and mucosa of the intestine. However, the treated dye showed no histopathological changes in any organs.
These findings suggest that NZVI treatment could be a viable method for reducing the environmental and health risks associated with textile dye pollution. However, further research is needed to evaluate this treatment's long-term safety and efficacy.
In addition, the study highlights the importance of treating textile dye wastewater before it is released into the environment. Textile dye pollution is a global problem that can significantly impact aquatic ecosystems and human health. By treating textile dye wastewater, we can help to protect the environment and safeguard public health.

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Received: 25 June 2023/ Accepted: 26 August 2023 / Published:15 September 2023

Citation: Mustafa S R, Hadeer A.A., Ali V, Hakeem Ali S A.Study pathological changes to evaluate efficient treatment of industrial dyes in wastewater. Revis Bionatura 2023;8 (3) 97
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