PERFORMANCE OF BUBBLE COLUMN BIOREACTOR TO PRODUCE LIQUID ORGANIC FERTILIZER (LOF) FROM COW URINE AND SLURRY ORGANIC WASTE

This research aimed to evaluate the effectiveness of various diffusers in a bioreactor for producing liquid organic fertilizer (LOF) using cow urine and slurry waste as materials. LOF was produced by treating with Urine-Single Orifice Diffuser (USOD), Urine-Coarse Bubble (UCBD), Urine-Fine (UFBD), Slurry-Single (SSOD), Slurry-Coarse (SCBD), Slurry-Fine (SFBD) equipped water pump an external aerator unit. The circulated agitated biomass at discharge 10 L/min. Meanwhile, unit pumped air into bioreactor, which absorbed 45 also caused agitation fermented biomass. Several variables were observed during fermentation process, including temperature, acidity (pH), total dissolved solids (TDS), C/N ratio, electrical conductivity (EC), biological oxygen demand (BOD), microbial population, cation exchange capacity (CEC), other chemical properties. had pH, matter content, EC, TDS, BOD, CEC values 6.3–6.8, 28.0–37.0°C, 20.77–22.46%, 54630–62369.24 µmS, 7543–11700 ppm, 1.2–2.6 mg/L, 3.2–7.5 log CFU, 12.3–14.1, 29.98 me/100 g, respectively. macro micro nutrient contents bio-urine 12.72–12.96%, 3.09–3.25%. those bio-slurry 12.35–12.99% 2.39–2.72%. These characteristics accordance Indonesian National Standard (SNI).