Mixture composition and coal size effect on coal water mixture quality

2024-03-30T04:46:36+00:00

Coal usage as a primary energy source is targeted to continue to increase and replace petroleum as the main energy source. Further processing is required to achieve the standard fuel characteristics, one of which is through a process called Coal Water Mixture (CWM) by adding water and additives to coal to produce fuel with characteristics like heavy oil. This research was conducted to analyze the best composition and size of the coal for CWM processing using variations in coal composition (20 %; 30 %; 40 %; 50 %; and 60 %) and coal particle size (40, 80, and 120 mesh). The parameters studied for each CWM product are product quantity, inherent moisture, density, pH, and calorific value. The results of the initial analysis show that the CWM product with a coal composition of 50 % has characteristics that most closely resemble Heavy Fuel Oil (HFO). CWM product with a coal composition of 50 % with all three variations of coal size was then tested for its calorific value and the respective values were 3476.3153 cal/g; 4025.5551 cal/g; and 4488.4248 cal/g. The resulting product meets the physical characteristics qualifications, but to substitute HFO as fuel, it is necessary to use high quality coal, namely anthracite with a higher calorific value or upgrade the coal raw materials that will be used for the CWM processing.

Production of ceramic membranes made from porang (Amorphophallus muelleri B.) and zeolite and its utilization on jumputan wastewater treatment

2024-04-24T14:21:28+00:00

Palembang has a rich art of weaving jumputan cloth. Jumputan fabric uses naphthol as a dye which if discharged into the river will affect the water. Porang (Amorphophallus muelleri B.) and zeolite have potential as absorbents in absorbing impurities in liquid waste from jumputan cloth through its modification into membranes. The purpose of this study was to determine the formulation and effectiveness of ceramic membranes from porang tubers and zeolites in treating jumputan cloth wastewater, and to characterize the permeate results from the membrane. This research uses ceramic membrane filtration method combined with coagulation using Poly Aluminum Chloride (PAC) and quicklime. Coagulation uses two stirring methods, namely fast and slow stirring. Filtration was carried out for 125 minutes and every 25 minutes the filtrate was sampled. After the filtration process, several parameters were analyzed, namely turbidity, color, TSS, and pH. The best turbidity value reduction was shown in membrane variation 2 at 50 minutes with a decrease of 68.71 %, a decrease in color concentration was shown in membrane variation 2 at 75 minutes operating time with a decrease of 69.19%, the decrease in TSS value is shown in membrane 2 at an operating time of 125 minutes with a decrease of 81.03 %. The highest pH increase was found in membrane variation 1 at an operating time of 125 minutes with an increase of 42.67 %. The filtration process with ceramic membranes is effective in reducing turbidity, color concentration, TSS, and increasing the pH of the waste.

Jurnal Teknik Kimia

Mixture composition and coal size effect on coal water mixture quality

Production of ceramic membranes made from porang (Amorphophallus muelleri B.) and zeolite and its utilization on jumputan wastewater treatment