Dyes mostly used in the textile industry end up in their wastewater. The treatment of textile effluent has become necessary because of its associated environmental and health problems. In this study, five bacterial is...Dyes mostly used in the textile industry end up in their wastewater. The treatment of textile effluent has become necessary because of its associated environmental and health problems. In this study, five bacterial isolates were obtained from textile effluent. The isolated bacteria were used to decolourise effluent samples in a time-dependent manner and the change in colour was observed using an Ultraviolet-visible spectrophotometer. After 24 hours, decolourisation efficiencies of the five isolates were calculated and the highest decolourisation efficiency (78.5%) was observed with one of the isolates (E12). Isolate E23 recorded 64.7% followed by isolate E9 (62.0%) and E21 (53.7%). Isolate E19 had the lowest decolourisation efficiency (2.6%). The isolated bacteria were identified with E9 as <i>Aeromonas hydrophilia</i>, E12 as <i>Aeromonas hydrophilia</i>, E19 as <i>Pseudomonas aeruginosa</i>, E21 as <i>Aeromonas hydrophilia</i> and E23 as <i>Pseudomonas fluorescens</i>. To achieve a decolourisation efficiency of 78.5%, 25 ml of textile wastewater should be inoculated with 1 ml of the isolate (E12) culture. Thus, Isolate E12 (<i>Aeromonas hydrophilia</i>) is considered a promising candidate for biological textile wastewater treatment followed by isolate E23 (<i>Pseudomonas fluorescens</i>).展开更多
<p> <span><span style="font-family:"">This paper presents the plant design for fuel production from plastic waste. The types of plastics to be used for the fuel production include poly...<p> <span><span style="font-family:"">This paper presents the plant design for fuel production from plastic waste. The types of plastics to be used for the fuel production include polyethylene, polypropylene and polystyrene. All these materials are to be sourced from Kpone landfill site in Accra, Ghana, where the plant is to be situated. The major fuels produced are gasoline, diesel and kerosene with a plant capacity of approximately 1000 tons of plastic waste per day and its attainment is 95<span style="white-space:nowrap;">%</span>. The production process involves sorting the municipal solid waste to obtain suitable plastics. The plastics are extruded and cracked thermally in a Pyrolyzer and the gases from it are reformed over Zeolite-ZSM 5 as the catalyst in a reactor. Resulting vapours are fractionated in a column to obtain the various fuel components. The plant operates 24 hours/day and 347 days/year with <span>3 shifts per day of 8 hours per shift. Total capital required to build and</span> start up the plant amounts to approximately 17 Million US Dollars. The plant life is <span>25 years with an annual rate of return of 34<span style="white-space:nowrap;">%</span> and a payback period of 2.9</span> years for this project, after setting up. Annually, the plant would generate gross and net profits of approximately 9 Million US Dollars and 6.7 Million US Dollars respectively.</span></span><span></span> </p>展开更多
文摘Dyes mostly used in the textile industry end up in their wastewater. The treatment of textile effluent has become necessary because of its associated environmental and health problems. In this study, five bacterial isolates were obtained from textile effluent. The isolated bacteria were used to decolourise effluent samples in a time-dependent manner and the change in colour was observed using an Ultraviolet-visible spectrophotometer. After 24 hours, decolourisation efficiencies of the five isolates were calculated and the highest decolourisation efficiency (78.5%) was observed with one of the isolates (E12). Isolate E23 recorded 64.7% followed by isolate E9 (62.0%) and E21 (53.7%). Isolate E19 had the lowest decolourisation efficiency (2.6%). The isolated bacteria were identified with E9 as <i>Aeromonas hydrophilia</i>, E12 as <i>Aeromonas hydrophilia</i>, E19 as <i>Pseudomonas aeruginosa</i>, E21 as <i>Aeromonas hydrophilia</i> and E23 as <i>Pseudomonas fluorescens</i>. To achieve a decolourisation efficiency of 78.5%, 25 ml of textile wastewater should be inoculated with 1 ml of the isolate (E12) culture. Thus, Isolate E12 (<i>Aeromonas hydrophilia</i>) is considered a promising candidate for biological textile wastewater treatment followed by isolate E23 (<i>Pseudomonas fluorescens</i>).
文摘<p> <span><span style="font-family:"">This paper presents the plant design for fuel production from plastic waste. The types of plastics to be used for the fuel production include polyethylene, polypropylene and polystyrene. All these materials are to be sourced from Kpone landfill site in Accra, Ghana, where the plant is to be situated. The major fuels produced are gasoline, diesel and kerosene with a plant capacity of approximately 1000 tons of plastic waste per day and its attainment is 95<span style="white-space:nowrap;">%</span>. The production process involves sorting the municipal solid waste to obtain suitable plastics. The plastics are extruded and cracked thermally in a Pyrolyzer and the gases from it are reformed over Zeolite-ZSM 5 as the catalyst in a reactor. Resulting vapours are fractionated in a column to obtain the various fuel components. The plant operates 24 hours/day and 347 days/year with <span>3 shifts per day of 8 hours per shift. Total capital required to build and</span> start up the plant amounts to approximately 17 Million US Dollars. The plant life is <span>25 years with an annual rate of return of 34<span style="white-space:nowrap;">%</span> and a payback period of 2.9</span> years for this project, after setting up. Annually, the plant would generate gross and net profits of approximately 9 Million US Dollars and 6.7 Million US Dollars respectively.</span></span><span></span> </p>
