Study on treatment of biological waste sludge from the wastewater treatment system of cattle slamming facility into earthworm culture biomass (perionyx excavatus)
Abstract
Sludge from wastewater treatment systems from livestock activities is always a problem that needs to be addressed to achieve a green, sustainable economy. This study conducts biological sludge treatment from the wastewater treatment system of cattle slaughterhouses into earthworm farming biomass. The biomass formed from mixing sewage sludge and water in different ratios is evaluated for nutritional content and then used to grow worms. Earthworms were evaluated for their growth rate, development, and biomass after a period of culture. As a result, after 14 weeks of culture, earthworms reproduce and grow fastest at the mixing ratio of 60 % sewage sludge and 40 % water. Evaluation of the composition of earthworm manure shows that earthworm manure has high nutritional content, suitable for use as an organic fertilizer product with fluctuating pH, organic matter content, total N, total P, and total K in the corresponding range of 6.5 ÷ 7.4; 5.72 ÷ 6.76 %; 0.228 ÷ 0.262 %; 0.052 ÷ 0.066 % P2O5; 0.023 ÷ 0.036 % K2O.
