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Сollection System of SW

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Door to door collection system of SW has great influence on proper SWM at KUET campus which includes neat and clean, odor nuisance free and aesthetically beautiful and environmentally friendly campus. High density polythene, steel, glass, paper has been separated daily and sold into the market for the purposes of recycling. Recycling is mainly important for reducing the energy consumption, creating employment, making earning source and prolonging the life of landfill.

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From the SW composition, about 50 to 60% of SW is the food and vegetable waste which is compostable. By composting process, huge amount of SW can be minimized and converted into soil conditioner and also helpful for making earning source and saves the landfill spaces. Transportation of SW into SWMP through rickshaw van results the campus more aesthetically beautiful and eco-friendly. KUET authority has own rickshaw van, SWMP, waste collector and supervisor, green watch man and waste separator. They are responsible for collecting waste from the point of waste generation and transport them into SWMP.

Sorting of SW enhances the composting and recycling system as well as saves the more landfill spaces. Partial sorting has been done at the source of waste generation. The waste mainly sorted into degradable and non-degradable at the source of waste generation. Sorting is mainly important for waste reusing, recycling and composting. Throwing of waste from windows of residential and academic buildings and waste littering in KUET campus is strictly discouraged by the KUET authority. Awareness among staff, students and visitors imparts the effective SWM at this campus. Every year a waste management initiatives program is held to make awareness among students during orientation program for new coming students.

Financial support for constructing rickshaw van, dustbin including concrete supporting stand, buying mask, gumboot, gloves, apron and for disposal of SW to ultimate disposal site helps the sustainable SWM. KUET has made a burning unit integrated with SWMP for burning of sanitary waste. A little amount of sanitary waste has been generated including gauge, bandage, napkin etc. especially from medical center and female dormitory. These wastes have been burnt into this burning unit. If authority can’t find any option for recycling of paper and low density plastic (polythene) then it is responsible for creating environmental problem and need more landfill space for their disposal, need more money for their carriage to the ultimate disposal site and also authority deprived from earning money from these wastes.

The burning unit’s temperature has been observed as 563°C and 561°C for sample 1 and sample 2, respectively calculated through infrared gauge (Sutradhar et al. 2017). The temperature produced is a function of the heating value of the waste and additional energy, incinerator or burn unit design, and air supply and combustion control. Entire burning needs high temperatures. Normally, temperatures that exceed 650°C with a period of 1 to 2 seconds will cause total combustion of most food and other household waste. Segregation of waste is essential when using methods that do not regularly gain these temperatures. Dual chamber incinerators, which are designed to burn complex mixtures of waste, harmful waste and biomedical waste, must provide a temperature higher than 1000°C and a period of at least one second to assure complete burning and reduce dioxin and furan pollutants. When these high temperatures and periods are obtained, waste will be completely burnt off and ash, smoke and pollutant quantities will be reduced (Nunavut Department of Environment, 2012).

Without appropriate training, the staff cannot handle, collect, transport and separate wastes properly. To make them efficient staff for SWM, it is very important to arrange training program on WM by authority at a certain interval. Roadside construction waste deposition hampers the aesthetical view of this campus and also creates dust problems. Without best route selection, collection and transportation of SW will be laborious and time costly. From the study it has been observed that the time needed for decomposition of compostable waste is about three months and creates the space limitation into SWMP.

Lots of recyclable SW has been generated at this campus including plastic, polythene, iron, glass, paper etc. and most of them has been sold into the local market which is the source of earning money and saves the landfill spaces. The amount of recyclable material can be increased by proper sorting of SW at SWMP and by source separation of SW. More recyclable material provides sustainable SWM and makes earning source for SWM. From the laboratory analyses, lemon peel comprises lots of aromatic and anti-insecticidal, anti-bacterial and anti-fungicidal compounds and can be used as an effective air freshener, floor and tiles cleaner and as an insect repellent.

From some measured representative characteristics, it can be seen that the calcium content of eggshells is very high as 31.50%, while carbon, nitrogen, C/N ratio and pH has been observed as 13.23%, 0.84%, 15.75, and 7.6 respectively (Sarder et al. 2016). As a highly calcium content material, the eggshells is very helpful to provide necessary calcium to the plants if it mixed with soil. Soil can easily absorbed calcium from eggshell powder and helpful for prevention of BER disease and enriched pH of acidic soil and may be used as calcium supplement for human. Proper route selection helps to saves the time for collecting and transporting SW.

Damages of rickshaw-van hamper the collection and transportation of SW and affect the whole SWM at this campus with respect to social, aesthetical, economic and environmental point of view. Roadside dustbin helps to storage of SW which enhances the aesthetics of this campus. Damages of these bins hamper the aesthetical and environmental conditions around the surroundings. Sometimes SW generation has been observed as high specially in rainy season and during national and international seminar held in this campus and complexities arises to disposed them into ultimate disposal site because the authority needs to depend on the vehicles from other organization and private sector. Damages of WMP through fire causes or storm will create very much dangerous effects on SWM, but the chances are very less. Accidents among staff in Collecting, Transporting and Sorting of SW also hamper the SWM of KUET campus.

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