Nutrient Recovery From Cow Urine Using Slanted Soil System With Brick and Diatom Media

ABSTRACT Cow urine contains valuable nutrients that can be recovered for reuse in agriculture. This study aimed to evaluate the application of the slanted soil system (SSS) for treating cow urine with a mixed filtration media and further application of the used media as slow‐release fertilizer. Treatment of cow urine was performed in an SSS containing a combination of diatoms and bricks as filtration media. Afterwards, diatoms were used for mustard planting with five media combinations. The results showed that SSS could remove COD at 77.1 ± 2.3% efficiency on Day 1 and 70.8 ± 2.1% on Day 2. COD removal mostly occurred in the container with bricks as filtration media, while the nutrients were mostly recovered in diatoms. A combination of 75% soil and 25% diatoms produced mustard plants with the best results. This shows that the diatoms that have been drained by cow urine can be used as a slow‐release fertilizer.