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Applications of Microcontrollers
Published in T. Kishore Kumar, Ravi Kumar Jatoth, V. V. Mani, Electronics and Communications Engineering, 2019
Nihar Ranjan Panda, P. N. S. Sailaja, Rupali Satapathy
An oxygen concentrator produces a supply of air with increased oxygen content. It can be used to replace liquid oxygen or pressurized oxygen tanks for people who require oxygen-enriched air. Oxygen concentrators work by removing the nitrogen which normally accounts for approximately 78% of the volume of ambient air. The compressor that moves air into the oxygen concentrator and generates the pressure in the sieve beds is driven by an electric motor, making efficient motor control an important part of oxygen concentrator design. Microchip’s high performance 16-bit dsPIC30F family of digital signal controllers offers powerful dedicated peripherals to simplify control various types of motors.
Removal of dimethyl phthalate from water by ozone microbubbles
Published in Environmental Technology, 2017
The experiments were carried out in a pilot plant, which is shown in Figure 1 [30]. The setup comprised an oxygen concentrator, an ozone generator, and a microbubble generator. The pressurized-dissolution/decompression type of microbubble generator (Riverforest Corp. USA, model: AS MK-III) was used to generate the microbubbles. Tap water was filtered to remove the iron present in it. This filtered water was used to prepare the aqueous solutions of DMP. The oxygen concentrator (Oz-Air, India, model: HG 03), which works by the pressure swing adsorption technique, was used to separate oxygen from air. It generated high-purity oxygen from air (>98% by volume). Its oxygen output capacity was 0‒83 cm3 s‒1. This oxygen was fed to the ozone generator (Oz-Air, India, model: ISM 10 Oxy EC), which converted oxygen to ozone by the corona-discharge method. The ozone generation rates were varied in the range of 0.5–3 mg s‒1, as per the recommendation of the manufacturer. A rotameter was used to measure the flow rate of the gas mixture (i.e. oxygen and ozone) coming out of the ozone generator. The gas mixture from the ozone generator was passed into the microbubble generator, which was connected to a polycarbonate reactor of 20 dm3 capacity in a recirculation mode. It had a gas intake capacity of 1.7 cm3 s‒1. In the microbubble generator, the dissolution of gas in water was achieved by applying a high pressure and the microbubbles with a mean diameter of ∼30 µm were continuously generated by the release of pressure. An ozone destructor (Oz-Air, India, model: Dest-50) was used to catalytically convert the excess ozone coming out of the reactor (and the microbubble generator) to oxygen. The temperature of the aqueous phase within the reactor was controlled at 298 K by an external circulator water bath (Jeio Tech, Korea, model: RW-2025G).