Solid wastes generated during the tanning process are an unavoidable byproduct that is typically ... more Solid wastes generated during the tanning process are an unavoidable byproduct that is typically disposed of through dumping or incineration. These processes pose serious environmental threats. Among various tannery solid wastes, leather shaving dust contributes a large portion. Its reuse is a burning issue for sustainable tannery solid waste management. There are several possible ways to reuse this waste product. For example, leather shaving dust can be converted into useful products such as leather boards, biofuel, and compost. In this research, various composite boards were made using leather shaving dust in combination with other industrial wastes, including cotton and jute waste from the garment and jute sectors. The highest 8.90 MPa tensile strength was obtained for the leather dust-cotton-jute board compared to 7.89 MPa for the control leather dust board. The addition of cotton and jute materials lowered the hardness. The highest 81.2 hardness was found for the leather dust-c...
Leather tanning industry, considered one of the polluting industries, poses various environmental... more Leather tanning industry, considered one of the polluting industries, poses various environmental threats to its every sphere. It produces various types of solid wastes as well as liquid wastes. Among the solid wastes, untanned raw trimmings contribute for about 5-7% of the total quantity of raw materials processed. If suitably utilized, these by-products of tanning industry could be a useful resource for various applications. This research work deals with utilization of raw trimmings of tannery solid waste to protein hydrolysate by acetic acid with varying acid concentration, acid solution, temperature and time. The maximum about 76% protein hydrolysate was obtained at 1.5M acid concentration and 80ºC.
Journal of Fundamentals of Renewable Energy and Applications, 2018
In this study, we describe the design, construction and the performance of an eco-friendly non-el... more In this study, we describe the design, construction and the performance of an eco-friendly non-electric refrigerator. The refrigerator is made up of stainless steel (SS) chambers, drawers, four different types of insulation materials, refrigerant materials, gaskets, screws, sensors etc. The refrigerant material used herein was the mixture of table salt and ice with an optimum ratio of 1:2. The refrigerant materials were preserved in a stainless steel (SS) chamber of optimal dimension covered by four successive layers of insulation materials. A refrigeration time of about fifty three hours of the preliminary designed refrigerator was attained. The microbiological effects of freezing mixture on foods and food stuffs preserved into the refrigerator have also been studied. The performance of the preliminary setup is found to be promising for developing non-electric low cost refrigerator considering the raw materials used, easy fabrication procedure, temperature control mechanism and health issues. However, further studies are needed for realization of an environmental friendly novel green refrigerator powered by chemical energy from very low cost freezing mixture.
Keratin is a highly specialized fibrous protein, which is found in feathers, hair, wool and nails... more Keratin is a highly specialized fibrous protein, which is found in feathers, hair, wool and nails. Bioremediation of these waste materials is an issue requiring serious attention regarding environmental concern. In the present research work keratin protein is extracted from poultry chicken feather which is now treated as valueless product of poultry processing plants. Although it contains high keratin protein content, this byproduct is dumped continuously into the environment without further treatment. Millions of tons of chicken feathers are produced every year from poultry industry of Bangladesh which disposed off into environment without any industrial treatment. This protein rich valuable byproduct can be recycled and utilized effectively which has great economic and ecological importance. In this study, alkali-enzymatic hydrolysis was done for the extraction of keratin protein from feather. Desired result was found in reflux condensation system which yielded 76.2% protein hydrolysate compared to conventional hot plate hydrolysis which was yielded 52.63%. Detection and concentration of protein were determined by Biuret and Kjeldahl methods respectively.
Keratin is a highly specialized fibrous protein, which is found in feathers, hair, wool and nails... more Keratin is a highly specialized fibrous protein, which is found in feathers, hair, wool and nails. Bioremediation of these waste materials is an issue requiring serious attention regarding environmental concern. In the present research work keratin protein is extracted from poultry chicken feather which is now treated as valueless product of poultry processing plants. Although it contains high keratin protein content, this byproduct is dumped continuously into the environment without further treatment. Millions of tons of chicken feathers are produced every year from poultry industry of Bangladesh which disposed off into environment without any industrial treatment. This protein rich valuable byproduct can be recycled and utilized effectively which has great economic and ecological importance. In this study, alkali-enzymatic hydrolysis was done for the extraction of keratin protein from feather. Desired result was found in reflux condensation system which yielded 76.2% protein hydrolysate compared to conventional hot plate hydrolysis which was yielded 52.63%. Detection and concentration of protein were determined by Biuret and Kjeldahl methods respectively.
Traditionally, tanning industry has been producing considerable amounts of solid wastes, which ra... more Traditionally, tanning industry has been producing considerable amounts of solid wastes, which raises serious concerns on account of their environmental impact. Out of these, untanned raw trimmings account for about 5-7% of the total quantity of raw materials processed. This waste could be a value-added cheap source of collagen, which has numerous industrial applications if properly and scientifically utilized. This research work deals with the utilization of raw trimmings of solid waste from tanneries in the process of enzymatic hydrolysis, performed by using acetic acid and protease, in order to obtain protein hydrolysate. The hydrolysis was carried out with varying acid concentrations, acid solutions, temperatures and times. The maximum obtained protein hydrolysate was about 88% at 1.5 M acid concentration, 4% enzyme ratio, and 60 °C.
Solid wastes generated during the tanning process are an unavoidable byproduct that is typically ... more Solid wastes generated during the tanning process are an unavoidable byproduct that is typically disposed of through dumping or incineration. These processes pose serious environmental threats. Among various tannery solid wastes, leather shaving dust contributes a large portion. Its reuse is a burning issue for sustainable tannery solid waste management. There are several possible ways to reuse this waste product. For example, leather shaving dust can be converted into useful products such as leather boards, biofuel, and compost. In this research, various composite boards were made using leather shaving dust in combination with other industrial wastes, including cotton and jute waste from the garment and jute sectors. The highest 8.90 MPa tensile strength was obtained for the leather dust-cotton-jute board compared to 7.89 MPa for the control leather dust board. The addition of cotton and jute materials lowered the hardness. The highest 81.2 hardness was found for the leather dust-c...
Leather tanning industry, considered one of the polluting industries, poses various environmental... more Leather tanning industry, considered one of the polluting industries, poses various environmental threats to its every sphere. It produces various types of solid wastes as well as liquid wastes. Among the solid wastes, untanned raw trimmings contribute for about 5-7% of the total quantity of raw materials processed. If suitably utilized, these by-products of tanning industry could be a useful resource for various applications. This research work deals with utilization of raw trimmings of tannery solid waste to protein hydrolysate by acetic acid with varying acid concentration, acid solution, temperature and time. The maximum about 76% protein hydrolysate was obtained at 1.5M acid concentration and 80ºC.
Journal of Fundamentals of Renewable Energy and Applications, 2018
In this study, we describe the design, construction and the performance of an eco-friendly non-el... more In this study, we describe the design, construction and the performance of an eco-friendly non-electric refrigerator. The refrigerator is made up of stainless steel (SS) chambers, drawers, four different types of insulation materials, refrigerant materials, gaskets, screws, sensors etc. The refrigerant material used herein was the mixture of table salt and ice with an optimum ratio of 1:2. The refrigerant materials were preserved in a stainless steel (SS) chamber of optimal dimension covered by four successive layers of insulation materials. A refrigeration time of about fifty three hours of the preliminary designed refrigerator was attained. The microbiological effects of freezing mixture on foods and food stuffs preserved into the refrigerator have also been studied. The performance of the preliminary setup is found to be promising for developing non-electric low cost refrigerator considering the raw materials used, easy fabrication procedure, temperature control mechanism and health issues. However, further studies are needed for realization of an environmental friendly novel green refrigerator powered by chemical energy from very low cost freezing mixture.
Keratin is a highly specialized fibrous protein, which is found in feathers, hair, wool and nails... more Keratin is a highly specialized fibrous protein, which is found in feathers, hair, wool and nails. Bioremediation of these waste materials is an issue requiring serious attention regarding environmental concern. In the present research work keratin protein is extracted from poultry chicken feather which is now treated as valueless product of poultry processing plants. Although it contains high keratin protein content, this byproduct is dumped continuously into the environment without further treatment. Millions of tons of chicken feathers are produced every year from poultry industry of Bangladesh which disposed off into environment without any industrial treatment. This protein rich valuable byproduct can be recycled and utilized effectively which has great economic and ecological importance. In this study, alkali-enzymatic hydrolysis was done for the extraction of keratin protein from feather. Desired result was found in reflux condensation system which yielded 76.2% protein hydrolysate compared to conventional hot plate hydrolysis which was yielded 52.63%. Detection and concentration of protein were determined by Biuret and Kjeldahl methods respectively.
Keratin is a highly specialized fibrous protein, which is found in feathers, hair, wool and nails... more Keratin is a highly specialized fibrous protein, which is found in feathers, hair, wool and nails. Bioremediation of these waste materials is an issue requiring serious attention regarding environmental concern. In the present research work keratin protein is extracted from poultry chicken feather which is now treated as valueless product of poultry processing plants. Although it contains high keratin protein content, this byproduct is dumped continuously into the environment without further treatment. Millions of tons of chicken feathers are produced every year from poultry industry of Bangladesh which disposed off into environment without any industrial treatment. This protein rich valuable byproduct can be recycled and utilized effectively which has great economic and ecological importance. In this study, alkali-enzymatic hydrolysis was done for the extraction of keratin protein from feather. Desired result was found in reflux condensation system which yielded 76.2% protein hydrolysate compared to conventional hot plate hydrolysis which was yielded 52.63%. Detection and concentration of protein were determined by Biuret and Kjeldahl methods respectively.
Traditionally, tanning industry has been producing considerable amounts of solid wastes, which ra... more Traditionally, tanning industry has been producing considerable amounts of solid wastes, which raises serious concerns on account of their environmental impact. Out of these, untanned raw trimmings account for about 5-7% of the total quantity of raw materials processed. This waste could be a value-added cheap source of collagen, which has numerous industrial applications if properly and scientifically utilized. This research work deals with the utilization of raw trimmings of solid waste from tanneries in the process of enzymatic hydrolysis, performed by using acetic acid and protease, in order to obtain protein hydrolysate. The hydrolysis was carried out with varying acid concentrations, acid solutions, temperatures and times. The maximum obtained protein hydrolysate was about 88% at 1.5 M acid concentration, 4% enzyme ratio, and 60 °C.
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