EFFECT OF WASTE ACTIVATED SLUDGE AND PALM FIBER RATIO ON QUALITY OF COMPOST
DOI:
https://doi.org/10.14456/lsej.2024.8Keywords:
compost, waste activated sludge, palm fiberAbstract
Waste activated sludge (WAS) and palm fibers are classified as industrial waste with a high amount of nutrients and organic matter. This research is investigated the effect of 6 ratios of WAS to palm fiber at 100:0, 90:10, 80:20, 70:30, 60:40 and 50:50 by weight for 60 days. The results showed that all ratios of compost had physical properties in accordance with the standard for organic fertilizer of the Department of Agriculture. While the chemical properties, the cadmium content was found to be in the range of 4.6 to 8.3 mg/kg, which exceeds the standards and tends to increase as the proportion of WAS increases. The 70:30 ratio achieved the highest germination index (83.10%), which differed significantly from the other ratios. In conclusion, a compost ratio 70:30 is deemed most suitable for producing compost from WAS and palm fiber, meeting germination index standards. However, the slightly elevated cadmium content indicates the need for improved fermentation methods, possibly by using the proportion of WAS less than 50 %, sludge pretreatment to reduce cadmium before fermentation is a consideration and it is recommended to increase the type of materials used in co-fermentation. In addition, the long-term use of this compost on plants should be studied regarding its effects on the food chain and the environment.
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