| Title |
A Study on the Nutrient Composition and Heavy Metal Contents in Livestock Manure Compost·Liquefied Fertilizer |
| Authors |
안태웅 ( Ahn Taeung ) ; 김동민 ( Kim Dongmin ) ; 이흥수 ( Lee Heungsoo ) ; 신현상 ( Shin Hyunsang ) ; 정유진 ( Chung Eugene ) |
| DOI |
https://doi.org/10.15681/KSWE.2021.37.4.306 |
| Keywords |
Compost·liquefied fertilizer; Heavy metal; Livestock manure; Livestock manure management; Maturity degree |
| Abstract |
The application of organic fertilizer could be accompanied by potential hazards to soil and humans due to trace metals. Livestock manure compost·liquefied fertilizer is a well-established approach for the stabilization of nutrients and the reduction of pathogens and odors in manures, which can be evaluated as compost·liquefied. In this study, the livestock manure compost·liquefied fertilizers produced at 333 liquid manure public resource centers and liquid fertilizer distribution centers were collected from May to December 2019. The nutrient content (nitrogen, phosphorus, and potassium), physicochemical properties, and heavy metal content were investigated. The livestock manure compost·liquefied fertilizer was measured using a mechanical maturity measurement device. The organic matter, arsenic, cadmium, mercury, lead, chromium, copper, nickel, zinc, E. coli (O157:H7), Salmonella, etc. of the livestock manure compost·liquefied fertilizers were analyzed. The average heavy metal content in the livestock manure compost·liquefied fertilizer was as follows: Cr 2.9 mg/kg (0.2~8.7 mg/kg), Cu 20.4 mg/kg (1.6~74.1 mg/kg), Ni 1.3 mg/kg (0.4~4.2 mg/kg), and Zn 79.8 mg/kg (3.0~340.7 mg/kg). Although large-scale organic fertilizer plants and resources recycling centers produce good organic (liquid) fertilizers with proper components, it is necessary to standardize livestock manure compost·liquefied fertilizer in order to facilitate efforts to turn livestock manure into useful resources. |