Nghiên cứu sử dụng bùn thải công nghiệp phối trộn với phân bò làm thức ăn nuôi trùn quế (Perionyx excavatus)

Abstract

This study aimed to evaluate the effectiveness of using industrial sludge mixed with cow manure as feed for rearing earthworms (Perionyx excavatus). The experiment was designed as a completely randomized block with one factor - mixing ratios of sludge to cow manure - comprising five treatments (ranging from 0.25:1 to 1.25:1) and three replications, conducted over 30 days/time and to continue three times. The observed parameters included earthworm biomass, environmental conditions (pH, temperature, moisture, and EC), and the quality of vermicompost (levels of N, P, K, organic carbon, and heavy metals such as As, Pb, Cd, Hg). Data were analyzed using Analysis of Variance (ANOVA) and Duncan's test (p<0.05) for a single factorial randomized complete block design, 3 replicates. Results indicated that treatment NT1 (3.0 kg sludge + 12 kg cow manure) produced the highest earthworm biomass (3.7 times increase compared to the initial mass) and significantly improved nutrient contents (N, P, K, EC), while heavy metal concentrations remained within the permissible limits set by Vietnamese standards. The findings demonstrated that treated industrial sludge mixed with cow manure can be an effective and environmentally friendly feed source for earthworm farming, simultaneously addressing waste management and organic fertilizer production. It is recommended to apply treatment NT1 in practical-scale sludge treatment and vermicomposting systems.