Biodegradation of Tannic Acid, Chromium and Cadmium Present in Leather Industrial Effluents Using Microorganisms Isolated from Leather Industrial Sludge

The present work was aimed to isolate indigenous predominant adapted Bacterial strains from tannery waste which possess the ability to detoxify and degrade Tannic acid, Chromium and Cadmium from tannery effluent. Fifteen bacterial strains were isolated from tannery sludge samples out of which Paracoccus pantotrophus (Tannery Waste 15) and Bacillus velezensis (Tannery Waste 17) were found to be the most efficient isolates. Degradation of Tannic acid, Cadmium and Chromium were evaluated for the two selected isolates. Better degradation of heavy metals was recorded in co-cultured media on day 7. From the study, it is evident that both P. pantotrophus and B. velezensis have has the ability to degrade tannic acid with maximum degradation on day 7 and absorbance was found to be 0.915 and 0.383 respectively. The strain P. pantotrophus showed better tannic acid degradation than B. velezensis. Better degradation was observed with co-culturing of both the strains with absorbance of 0.274. Optimal cadmium degradation was observed on day 7 with OD 2.013 and 1.709 for B. velezensis and P. pantotrophus respectively. P. pantotrophus showed better cadmium degradation when compared to B. velezensis. Chromium degradation was maximum on day 7 and absorbance was 2.096 for P. pantotrophus and 0.560 for B. velezensis. The isolates recorded an acceptable reduction in the concentration of Tannin, Chromium and Cadmium in tannery effluent. The results of this showed that the isolates reduced the concentration of Tannin, Chromium and Cadmium present in the raw tannery effluent and suggest that the organisms can be used as a possible treatment of tannery effluents. Keywords: Bio-degradation, Bacillus velezensis, Paracoccuspantotrophus, Chromium, Cadmium, Tannic acid, Tannery effluent.

Perception of Local People Towards Tannery Industrial Waste: A Cross-Sectional Study on Hazaribagh Areas of Dhaka City

Though tannery industries such as RMG and pharmaceuticals have played a significant part in the country's economic sectors, they have had a serious detrimental impact on tannery workers and the Dhaka metropolitan environment. The major objective of the study was to measure the association between socio-demographic factors and perceptions of local people towards tannery industrial wastes. Following a simple random sampling technique, this study chose 384 respondents from the study area. The findings of the study reveal that a whopping 95% of respondents reported that tannery industrial wastes have serious effects on the environment in the study area. Again, the bivariate result of the study indicates that male, married respondents, educated respondents, and respondents with higher income are more likely to say that tannery waste is harmful to local people while male & age of the respondents, marital status, Muslim religion, and higher-income group socio-demographic variables are significantly associated with tannery industrial waste handling is highly risky. Moreover, sex, marital status, religion, and higher-income group are also found as significant indicators for creating disease by tannery industrial waste as well as sex, age and income have been found as the predictor for Tannery industrial waste segregation are essential.In conclusion, this study mainly emphasizes tannery industrial waste on the workers' health problems and lifestyles, furthermore, the findings also showed the environmental awareness & perceptions of local people caused by the hazardous tannery waste.

Strong Interaction Between Thiol and Silver Modified Silica Nanoparticles in the SERS Sensing of Municipal Solid Waste and Tannery Waste Leachate From Groundwater

A novel surface enhanced Raman spectroscopy (SERS) based polyvinylthiol (PVASH) and silver modified silica nanoparticles (PSA NPs) was prepared to actively concentrate different types of landfill leachate in water. PSA NPs were characterized with UV-visible spectroscopy, XRD, TEM and EDX. SERS sensitivity of the PSA NPs was proved with environmentally ignored leachate from municipal solid waste (MSW) landfill. The result shows that, SERS sensing of PSA NPs were improved with the presence of thiol group. Further, PSA NPs exhibited similar vibrational bands of MSW and tannery waste (TW) landfill leachate in their nearest homeland aquifers. Hence, this study provides a novel SERS sensor of PSA NPs in the tile to detect and analyze the environmentally ignored organic and inorganic compounds.

Continuous photocatalytic setup assisted with nano TiO2 plate for tannery waste water treatment

Novel photocatalytic continuous system for treatment of the tannery waste water has been proposed regarding to the concerns about their high environmental problems. The purification process was performed by passing wastewater on the TiO2-coated surface that continuously activated by irradiation of the UV-light. Moreover, in order to improve the yield of the process, FeCl3 was used as coagulation agent. The organic and inorganic compounds, as well as the microorganisms in the tannery waste water media have been degraded through photocatalytic process. The results revealed that total dissolved solids and total suspended solids contents were significantly decreased from 8,450 and 8,990 mg·L−1 to 4,032 and 4,127 mg·L−1, respectively. Furthermore, the chemical oxygen demand content of the sample was reduced from 370 to 50 mg·L−1 after addition of 100 mL FeCl3 and 4 h of treatment. The same results were observed for elimination of the sulfate and chromium ions that led to decline of the sample electrical conductivity. As a consequence, introducing 100 ml of FeCl3 as coagulation agent and continuous treatment with photocatalityc set-up could be remarked as an effective method for purification of the tannery wastewaters.