Env Exp Biol (2012) 10: 9–13

Utilization of waste from a milk cake factory to produce liquid organic fertilizer for plants

Abstract

The aim of this study was to assess the suitability of utilizing waste from a milk cake factory to produce liquid organic fertilizer with high organic matter and nutrient content. The raw materials for liquid organic fertilizer production were waste water, sewage sludge, molasses and microorganisms. The liquid organic fertilizer fermentation process was completed in 12 weeks. The suitable concentration of liquid organic fertilizer was determined in trials with chinese kale (Brassica alboglabra L.H. Bailey) and marigold (Tagetes erecta L.). A fertilizer produced at a ratio of 10 : 2 : 1 : 30 [wastewater (L) : sewage sludge (kg) : molasses (kg) : effective microorganisms (mL)] sprayed every other day at concentration of 0.002% (v/v) to foliage of chinese kale, and at a ratio of 20 : 2 : 1 : 30 applied at 0.003% concentration to roots of marigold showed the best growth response.