Abstract
The combustion process of organic waste has several drawback which produce flue gases containing pollutants SO2, HCl, tar and heavy metals (Cu, Hg, Fe, Zn, Pb, and Cr). The pollutants can be removed from the flue gas using a water scrubber. The process of absorption using the water scrubber can cause a rise in pressure in the combustion chamber.This research aims to study the effect of combustion process pressure of organic waste on the combustion rate. The research was conducted by burning waste in the reactor at various flow rate of combustion air. The exhaust gases of combustion then flowed into ihe water scrubber that the height varied. The change in pressure and combustion rate of each variation of the air flow rate and the height of the water scrubber was measured. According to the results, it was obtained the correlation of combustion pressure to the combustion rate was y = 0,844e-0,2X, where y = the combustion rate (kg/min) and x = combustion pressure (gauge, mm H2O). In addition, the increase in combustion pressure up to 21 mm of water, caused a reduction in combustion temperatures up to 50 ° C, while the combustion rate decreased to one-tenth from atmospheric combustion.
Highlights
In Malang city, organic waste is the biggest component of city waste which is equal to 68% (BPS, Malang city, 2013)
This study aims to obtain a specific correlation between changes in pressure caused by the absorbent water level used in the scrubber process against the organic waste combustion rate
In this research we have studied the characteristic of combustion velocity at higher pressure than 1 atmosphere caused by inhibition of flue gas flow in bubble type scrubber
Summary
In Malang city, organic waste is the biggest component of city waste which is equal to 68% (BPS, Malang city, 2013). The utilization of organic waste is as compost and most of it is still disposed of in landfills (TPA) that can produce methane gas for fuel. This process takes a long time (McDougall et al, 2001). Burning organic waste produces pollutants in the combustion exhaust gases that must be removed before being discharged into the outside air. One of the effective methods for removing exhaust gases is by absorption using a bubble scrubber (Phuphuakrat et al, 2011) This scrubber system can reduce the rate of combustion, because the flue gas flow is inhibited by the hydrostatic pressure of the absorbent fluid in the scrubbing tank
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