Sreedhar Reddy Sajjala | University of Nizwa (original) (raw)
Papers by Sreedhar Reddy Sajjala
DOAJ (DOAJ: Directory of Open Access Journals), Apr 1, 2019
In this study the quality of Omani and United Arab Emirates bottled water brands which are sold i... more In this study the quality of Omani and United Arab Emirates bottled water brands which are sold in Oman were assessed by comparing the chemical composition indicated on manufacturer’s label with local and international bottled water standards. Results indicated that all the bottled water brands are complying with local and international standards. According to piper diagram, the most dominant water type among Omani brands is mixed Ca2+-Mg2+-Cl- and among United Arab Emirate brands is calcium chloride. Hierarchical cluster analysis divided Omani and United Arab Emirate brands in to four groups based on similarity in chemical composition. Some of the Omani and United Arab Emirate brands have same chemical composition, but marketed under different names. Calcium concentration in Omani and United Arab Emirate brands is low compared to imported mineral water brands, and their contribution towards recommended dietary allowances of calcium for adults is only 3%. Both Omani and United Arab Emirate brands used in this study are meeting United States Food and Drug Administration’s very low sodium category requirements and are suitable for individuals on severely restricted sodium diet.
Social Science Research Network, 2020
In this study an attempt has been made to disinfect total coliform bacteria present in Falaj wate... more In this study an attempt has been made to disinfect total coliform bacteria present in Falaj water using solar water disinfection (SODIS) technology. SODIS experiments were conducted in winter (February 2018) and summer (May 2018) using polyethylene terephthalate (PET) bottles (less, thin and thick plastic PETs) and the glass ones of different capacities (0.5, 1 and 1.5 L). The results showed that total coliform disinfection rate in May was two folds greater than that in February. Water depth or volume of sample in the bottle had significant effect on the efficiency of SODIS. Highest disinfection rate was found on the samples collected from water depth of 6 cm (0.5 L), while the lowest was observed on samples of 8 cm in depth (1.5 L). No significant difference was observed in disinfecting total coliform between glass and less plastic PET bottle for shorter exposure periods (1 h). Results of this research have proved SODIS as anappropriate household water treatment and safe storage ...
In this study quality of locally produced bottled water brands in Oman assessed by comparing the ... more In this study quality of locally produced bottled water brands in Oman assessed by comparing the chemical composition indicated on manufacturer’s label with local and international bottled water standards. Results indicated that all the bottled water brands are complying with Omani standards, GSO and IBWA standards. Based on ionic constituents, using piper diagram 20 different water types were identified, in which the most frequently observed type was Mg-Cl. It is found that imported mineral water brands had high levels of calcium compared to locally produced brands. It was observed that local brands contributing only 3.3% of Dietary reference intake ( DRI) of calcium for adults. Based on dietary sodium contribution, Omani bottled water brands are well within FDA's very low sodium category and suitable for individuals on severely restricted Na diet.
Activated carbon (AC) is frequently used for purification due to its ability to remove pollutants... more Activated carbon (AC) is frequently used for purification due to its ability to remove pollutants either from air or water. Its porous structure allowed it to capture the pollutants and is widely recommended for numerous applications in water and wastewater treatment. However, AC application fields are restricted due to high cost. In this project, AC prepared from locally available date seeds is used for the removal of Methylene blue (MB) from Textile Water, in order to find alternative to commercial activated carbon (CAC). Physical properties of date seeds activated carbon (DSAC) and CAC were compared and batch adsorption processes were obtained to find the best condition for using DSAC in the removal of MBA. The experimental outcomes found that DSAC got high percentage removal and it has a good potential for economic removal of MB.
Bulletin of the Chemical Society of Ethiopia
Effective treatment of dyestuff containing textile dyeing industry effluents require advanced tre... more Effective treatment of dyestuff containing textile dyeing industry effluents require advanced treatment technologies such as adsorption for the removal of dyestuffs. Powdered commercial coal based activated carbon has been the most widely used adsorbent for the removal of dyestuffs from dyeing industry effluents. As an alternative to commercial coal based activated carbon, activated carbon prepared from dried tannery sludge was used as an adsorbent for dyestuff removal from simulated textile dying industry effluent in this study. The color removal performance of tannery sludge derived activated carbon and commercial coal based activated carbon has been investigated using parameters such as adsorbent dosage, initial dye concentration, pH and temperature. It was found that tannery sludge derived activated carbon exhibits dye removal efficiency that is about 80-90 % of that observed with commercial coal based activated carbon. The amount of dye adsorbed on to tannery sludge derived activated carbon is lower compared with commercial activated carbon at equilibrium and dye adsorption capacity increased with increase of initial dye concentration and temperature, and deceasing pH. It was found that the Langmuir isotherm appears to fit the isotherm data better than the Freundlich isotherm. The leachate of heavy metals from tannery sludge derived activated carbon to the environment is very low, which are within the standard limit of industrial effluent and leachable substances.
DOAJ (DOAJ: Directory of Open Access Journals), Apr 1, 2019
In this study the quality of Omani and United Arab Emirates bottled water brands which are sold i... more In this study the quality of Omani and United Arab Emirates bottled water brands which are sold in Oman were assessed by comparing the chemical composition indicated on manufacturer’s label with local and international bottled water standards. Results indicated that all the bottled water brands are complying with local and international standards. According to piper diagram, the most dominant water type among Omani brands is mixed Ca2+-Mg2+-Cl- and among United Arab Emirate brands is calcium chloride. Hierarchical cluster analysis divided Omani and United Arab Emirate brands in to four groups based on similarity in chemical composition. Some of the Omani and United Arab Emirate brands have same chemical composition, but marketed under different names. Calcium concentration in Omani and United Arab Emirate brands is low compared to imported mineral water brands, and their contribution towards recommended dietary allowances of calcium for adults is only 3%. Both Omani and United Arab Emirate brands used in this study are meeting United States Food and Drug Administration’s very low sodium category requirements and are suitable for individuals on severely restricted sodium diet.
Social Science Research Network, 2020
In this study an attempt has been made to disinfect total coliform bacteria present in Falaj wate... more In this study an attempt has been made to disinfect total coliform bacteria present in Falaj water using solar water disinfection (SODIS) technology. SODIS experiments were conducted in winter (February 2018) and summer (May 2018) using polyethylene terephthalate (PET) bottles (less, thin and thick plastic PETs) and the glass ones of different capacities (0.5, 1 and 1.5 L). The results showed that total coliform disinfection rate in May was two folds greater than that in February. Water depth or volume of sample in the bottle had significant effect on the efficiency of SODIS. Highest disinfection rate was found on the samples collected from water depth of 6 cm (0.5 L), while the lowest was observed on samples of 8 cm in depth (1.5 L). No significant difference was observed in disinfecting total coliform between glass and less plastic PET bottle for shorter exposure periods (1 h). Results of this research have proved SODIS as anappropriate household water treatment and safe storage ...
In this study quality of locally produced bottled water brands in Oman assessed by comparing the ... more In this study quality of locally produced bottled water brands in Oman assessed by comparing the chemical composition indicated on manufacturer’s label with local and international bottled water standards. Results indicated that all the bottled water brands are complying with Omani standards, GSO and IBWA standards. Based on ionic constituents, using piper diagram 20 different water types were identified, in which the most frequently observed type was Mg-Cl. It is found that imported mineral water brands had high levels of calcium compared to locally produced brands. It was observed that local brands contributing only 3.3% of Dietary reference intake ( DRI) of calcium for adults. Based on dietary sodium contribution, Omani bottled water brands are well within FDA's very low sodium category and suitable for individuals on severely restricted Na diet.
Activated carbon (AC) is frequently used for purification due to its ability to remove pollutants... more Activated carbon (AC) is frequently used for purification due to its ability to remove pollutants either from air or water. Its porous structure allowed it to capture the pollutants and is widely recommended for numerous applications in water and wastewater treatment. However, AC application fields are restricted due to high cost. In this project, AC prepared from locally available date seeds is used for the removal of Methylene blue (MB) from Textile Water, in order to find alternative to commercial activated carbon (CAC). Physical properties of date seeds activated carbon (DSAC) and CAC were compared and batch adsorption processes were obtained to find the best condition for using DSAC in the removal of MBA. The experimental outcomes found that DSAC got high percentage removal and it has a good potential for economic removal of MB.
Bulletin of the Chemical Society of Ethiopia
Effective treatment of dyestuff containing textile dyeing industry effluents require advanced tre... more Effective treatment of dyestuff containing textile dyeing industry effluents require advanced treatment technologies such as adsorption for the removal of dyestuffs. Powdered commercial coal based activated carbon has been the most widely used adsorbent for the removal of dyestuffs from dyeing industry effluents. As an alternative to commercial coal based activated carbon, activated carbon prepared from dried tannery sludge was used as an adsorbent for dyestuff removal from simulated textile dying industry effluent in this study. The color removal performance of tannery sludge derived activated carbon and commercial coal based activated carbon has been investigated using parameters such as adsorbent dosage, initial dye concentration, pH and temperature. It was found that tannery sludge derived activated carbon exhibits dye removal efficiency that is about 80-90 % of that observed with commercial coal based activated carbon. The amount of dye adsorbed on to tannery sludge derived activated carbon is lower compared with commercial activated carbon at equilibrium and dye adsorption capacity increased with increase of initial dye concentration and temperature, and deceasing pH. It was found that the Langmuir isotherm appears to fit the isotherm data better than the Freundlich isotherm. The leachate of heavy metals from tannery sludge derived activated carbon to the environment is very low, which are within the standard limit of industrial effluent and leachable substances.