The main goal of this research study was to establish the physicochemical characteristics of sewage sludge, and the nutrients needed to enhance the properties of soil with a view to exploiting were potential for agric...The main goal of this research study was to establish the physicochemical characteristics of sewage sludge, and the nutrients needed to enhance the properties of soil with a view to exploiting were potential for agriculture. The example used was the cultivation of radish (Raphanus sativus). The findings are intended as a contribution towards making agriculture sustainable. This study was carried out to assess the response of radish (Raphanus sativus L.) to doses of sewage sludge applied in medium texture soils, and the socioeconomic contributions that such cultivation of radish would make. Levels of 0.25 and 75 ton/ha of sewage sludge plus the equivalent dose of 25 ton/ha of sewage sludge vermin compost by California Red were used after making a randomized experimental design with three replicates. 30 days after sowing radish seeds, the following data were collected: the number of leaves per plant (NLP);plant height (PH in cm);root diameter (RD) and tubercle production (TP ton/ha). In addition, the pH, EC-electric conductivity (EC), and soil organic matter (SOM) were determined. Statistical analysis showed that 25 and 50 tons/ha gave the best results for the parameters assessed. The estimated increase in family mean income from selling radish crops fertilized with sewage sludge is around 17%.展开更多
The emission of fine particulates from the burning of coal can pose a number of problems for human health and the environment.The bag filter is an equipment capable of preventing these particles from reaching the atmo...The emission of fine particulates from the burning of coal can pose a number of problems for human health and the environment.The bag filter is an equipment capable of preventing these particles from reaching the atmosphere.The present work evaluated and proposed improvements based on information received from a process of a company producing vegetable bran and oils,which acts with high emission of particulates.The filter sleeves used were fiberglass fabric with expanded polytetrafluoroethylene membrane.Physical,mechanical and granulometric laboratory analyzes were performed,as well as scanning electron microscopy and dispersive energy spectroscopy for the characterization of the tissue and particulate matter.Based on the results,a new specification of stainless steel cage was proposed for the filter in order to improve the efficiency of retention,as well as to increase the useful life of the filter elements.展开更多
The manufacture of leather covers a wide productive chain and beyond contributes to the economic flow.The various stages of leather processing result in high volumes of solid waste.In Brazil,a daily generation of 375 ...The manufacture of leather covers a wide productive chain and beyond contributes to the economic flow.The various stages of leather processing result in high volumes of solid waste.In Brazil,a daily generation of 375 tons of solid waste is estimated,and landfills are still the most used route to its destination.In this review,emphasis will be given to researches that have sought alternatives for the use of solid waste from the tannery industry.Among the main applications of solid tannery wastes,the following stand out production of adsorbent materials,biodiesel,biogas,biopolymers,applications in agriculture and other applications involving extraction/recovery of compounds of industrial/commercial interest,isolation of microorganisms and production of enzymes and applications in the animal diet.In each alternative of waste application,the technologies used,the opportunities,and the challenges faced are mentioned.We hope that this review can provide valuable information to promote the broad understanding of the possibilities that tannery solid wastes has for the development of biodegradable and agricultural products,wastewater treatment,extraction of compounds of industrial and commercial interest,among others.展开更多
文摘The main goal of this research study was to establish the physicochemical characteristics of sewage sludge, and the nutrients needed to enhance the properties of soil with a view to exploiting were potential for agriculture. The example used was the cultivation of radish (Raphanus sativus). The findings are intended as a contribution towards making agriculture sustainable. This study was carried out to assess the response of radish (Raphanus sativus L.) to doses of sewage sludge applied in medium texture soils, and the socioeconomic contributions that such cultivation of radish would make. Levels of 0.25 and 75 ton/ha of sewage sludge plus the equivalent dose of 25 ton/ha of sewage sludge vermin compost by California Red were used after making a randomized experimental design with three replicates. 30 days after sowing radish seeds, the following data were collected: the number of leaves per plant (NLP);plant height (PH in cm);root diameter (RD) and tubercle production (TP ton/ha). In addition, the pH, EC-electric conductivity (EC), and soil organic matter (SOM) were determined. Statistical analysis showed that 25 and 50 tons/ha gave the best results for the parameters assessed. The estimated increase in family mean income from selling radish crops fertilized with sewage sludge is around 17%.
文摘The emission of fine particulates from the burning of coal can pose a number of problems for human health and the environment.The bag filter is an equipment capable of preventing these particles from reaching the atmosphere.The present work evaluated and proposed improvements based on information received from a process of a company producing vegetable bran and oils,which acts with high emission of particulates.The filter sleeves used were fiberglass fabric with expanded polytetrafluoroethylene membrane.Physical,mechanical and granulometric laboratory analyzes were performed,as well as scanning electron microscopy and dispersive energy spectroscopy for the characterization of the tissue and particulate matter.Based on the results,a new specification of stainless steel cage was proposed for the filter in order to improve the efficiency of retention,as well as to increase the useful life of the filter elements.
文摘The manufacture of leather covers a wide productive chain and beyond contributes to the economic flow.The various stages of leather processing result in high volumes of solid waste.In Brazil,a daily generation of 375 tons of solid waste is estimated,and landfills are still the most used route to its destination.In this review,emphasis will be given to researches that have sought alternatives for the use of solid waste from the tannery industry.Among the main applications of solid tannery wastes,the following stand out production of adsorbent materials,biodiesel,biogas,biopolymers,applications in agriculture and other applications involving extraction/recovery of compounds of industrial/commercial interest,isolation of microorganisms and production of enzymes and applications in the animal diet.In each alternative of waste application,the technologies used,the opportunities,and the challenges faced are mentioned.We hope that this review can provide valuable information to promote the broad understanding of the possibilities that tannery solid wastes has for the development of biodegradable and agricultural products,wastewater treatment,extraction of compounds of industrial and commercial interest,among others.
