Jurnal Puslitbang tekMira (Teknologi Mineral dan Batubara)
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THE INFLUENCE OF ACTIVATED ZEOLITE ON THE DECREASING OF NH3 CONCENTRATION IN FISH POND WATER
No full textA research on the utilization of zeolite from Tadisi Village, Sumarorang, Polmas, West Sulawesi had been carried out. The objective of this research is to identify the influence of activated zeolite both physically and chemically on the decreasing of NH3 concentration in fish pond water. The physical activation in this research was done by heating of zeolite samples at the temperature of 100, 200 and 300°C , while the chemical activation was carried out by using reagent of NaOH with the concentration of 2 N. The particle size of the zeolite used in this research was – 4 + 10 mesh and the weight of activated zeolite samples put into the fish pond water samples were 1; 5; and 10 grams with contact time of 0, 1, and 5 days, respectively. The optimal result of this research indicated that by the addition of 5 grams of the activated zeolite (which had been activated at the temperature of 300°C with contact time for one day), the NH3 concen- tration of fish pond water samples decreased as much as 54.97 %. The addition 10 grams of the activated zeolite (which had been activated by NaOH with concentration of 2 N with contact time for five days showed the optimum result by decreasing of the NH3 concentration in fish pond water samples as much as 45.01 %
NUMERICAL MODELLING AND SLOPE STABILITY ANALYSIS FOR OPTIMIZING OPEN PIT COAL MINE AT BINUANG SOUTH KALIMANTAN
No full textThe objective of the numerical modelling study and slope stability analysis using the finite element method (FEM) is to determine the optimum pit slope design. Many simulations were carried out by varying the overall pit slopes and the depth of the open pit coal mines. The pit slope with a safe condition in stability and a reasonable waste-coal ratio was chosen as the optimum pit slope design. According to the result of this study, some revisions on the existing pit slope design are needed. It is also recommended to develop a monitoring system, especially for instability monitoring and groundwa- ter level fluctuations behind the slope surfaces that could threaten the slope stability
ANALYSIS OF BLAST VIBRATION IMPACT AT PARAMBAHAN COAL MINE, WEST SUMATERA USING SQUARE ROOT SCALED DISTANCE METHOD
No full textBlasting which was conducted at Parambahan produced a series of blast vibrations that might be harmful to human safety and surroundings. Therefore, the vibrations need to be evaluated whether it was over permitted the threshold for human safety or not. One of analysis methods for this purpose is square root scaled distance. The principle of the proposed method is to assess blast vibration impact on the environment for the cases when the blasting for opening mine had been performed previously. Analysis results shows that blast vibrations at Parambahan is below the allowed threshold of blast vibration for environment. Using measurement distance from blast source of 20 to 2,000 m, the lowest measured vibration is 0.18 mm/s and the highest one is 21.0 mm/s. Those mean that blast-generated vibrations at Parambahan are still safe for human and surrounding environment
INDOOR AIR POLLUTION FROM BRIQUETTE-BURNING STOVES
No full textRecently, the use of coal briquette has already been socialized to substitute the role of oil and firewood in the household and small industries. In general the use of coal briquette burning stoves for household and small industries purposes is often conducted indoors, with inadequate ventilation. Yet knowledge of emissions from coal briquette burning stoves and how to evaluate emission and expo- sure levels are very limited and need to be developed. Study of indoor air pollution was undertaken to evaluate SO2, CO and NOx concentrations and its exposure potentials coming from the utilization of coal briquette for household and small industries purposes. Its results were compared to the charcoal burning process. To estimate the indoor concentration and exposure potential, the single-compart- ment mass balance model was used. Results show that the total amounts of hourly emitted SO2, CO and NOx for 1 kg coal briquette burning vary from 5.32-14.71 mg kg-1; 2.76-12.54 mg kg-1 and 112- 288 mg kg-1, respectively. While those emitted from charcoal burning are 0 mg kg-1, 6.79 mg kg-1 and 201 mg kg-1. The air exchange rate gives an effect to concentration level, peak indoor concentration and duration after the burning process. The hourly average concentrations of SO2, CO and NOx in the unventilated room are 22, 42 and 10 times, respectively higher than the used standards. While for charcoal burning, those were 0, 17 and 6 times, respectively