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Low Cost Sanitary Napkin Disposal Machine
Project Description :

The technology which i have invented is the disposal of sanitary napkins using cheap chemicals namely copper hydroxide commonly known as kocide and ammonium hydroxide (ammonia solution). the napkin dissolved solution collects in the septic tank, and thereby doesnot pave way to pollution of any sort. the problems related to conventional methods of flushing and burying such as pipe line blockages are also overcome in this new technology. this technology of disposal of sanitary napkins using cheap chemicals namely copper hydroxide [cu(oh)2] commonly known as kocide and ammonium hydroxide (ammonia solution-nh4oh). the napkin dissolved chemical solution collects in the septic tank, and thereby does not pave way to pollution of any sort. the problems related to conventional methods of flushing and burying such as pipe line blockages are also overcome in this new technology. the main two parts in the structure of a sanitary napkin are cotton and non-woven. the device works under the principle that the cotton gets dissolved in a chemical named ‘cuprammonium hydroxide’[cu(nh3)4(oh)2] and non-woven part can be recycled and used for making bags and covers. the cotton dissolved chemical solution is passed to the septic tank. the undissolved non-woven is collected in a waste tray. cuprammonium hydroxide is formed by mixing ‘copper hydroxide’ and ‘ammonium hydroxide’.the machine mainly consists of a alternating current(ac) single phase induction motor with sharp blades fitted at the end of the motor, for shredding the napkin into pieces, two plasma coated containers, one to hold cu(oh)2 and the other to hold nh4oh and a plasma coated reaction chamber for the reaction between the napkin and the chemical to take place, a waste tray to collect the undissolved napkin pieces and controlling unit consisting of a solenoid valve, microcontroller(atmega16) and a timer circuit to control the overall functioning of the machine.first when the used napkin is put through the inlet of the machine, it is shred into pieces by the ac single phase induction motor. the chemicals ammonium hydroxide(nh4oh) and copper hydroxide[cu(oh)2] are stored inside the plasma coated containers. the chemical bucket of cu(oh)2 is rotated from underneath by a direct current(dc) motor periodically(30 seconds time gap) controlled by a timer circuit to avoid sedimentation of the chemical. the shred napkin pieces go to the reaction chamber, in which the reaction between the napkin and the chemical (cu(nh3)4(oh)2) is to take place. the required amount of both chemicals needed for destroying one napkin is delivered into the reaction chamber through tube controlled by a solenoid valve. the opening and closing of the valve for a particular time is controlled by a programmed microcontroller (atmega16).the cotton gets dissolved in the chemical but non-woven does not. the destruction of the cotton part takes place in about 2-3 minutes. after this, the non-woven part is moved into a waste tray inside the machine itself and cotton dissolved solution goes into the septic tank. the reaction chamber is rotated from underneath by a direct current(dc) motor periodically(30 seconds time gap) controlled by a timer circuit so as to prevent chemical sedimentation and speed up cotton destruction.the approximate amount of final chemical (cu(nh3)4(oh)2) required to destroy one napkin is about 150ml. the chemicals should be mixed in the ratio nh4oh:cu(oh)2= 7:5, which means for making 150ml of the chemical solution the amount of nh4oh and cu(oh)2 required are respectively 87ml and 8gm.

 
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Project Details :
  • Date : Apr 02,2015
  • Innovator : Aiswarya Paramadathil
  • College : Adi Shankara Institute Of Engineering And Technology
  • Submission Year : 2016
  • Category : Environmental Engineering
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