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http://dx.doi.org/10.17137/korrae.2017.25.4.31

Nutrient Composition and Heavy Metal Contents of Matured Livestock Liquid Fertilizer in Korea  

Kang, Tak-Won (Dept. of Environmental Engineering, Sangji University)
Halder, Joshua Nizel (Dept. of Environmental Engineering, Sangji University)
Kim, Soo-Ryang (Industry-Academic Cooperation Foundation, Sangji University)
Yoon, Young-Man (Biogas Research Center, Hankyong National University)
Lee, Myung-Gyu (Dept. of Environmental Engineering, Sangji University)
Publication Information
Journal of the Korea Organic Resources Recycling Association / v.25, no.4, 2017 , pp. 31-39 More about this Journal
Abstract
From July to August 2013, liquid fertilizers produced at 180 liquid manure public resource centers and liquid fertilizer distribution centers were collected. The maturity of liquid fertilizers was measured using the mechanical maturity measurement device. The nutrient contents (nitrogen, phosphorus, and potassium), physicochemical properties, and heavy metal content of 46 liquid fertilizers were investigated in this study. We used a matured liquid fertilizer with a total number of 46, with number of 7 for Gyeonggi-do, 3 for Chungcheongbuk-do, 2 for Chungcheongnam-do, 13 for Jeollabuk-do, 5 for Jeollanam-do, 3 for Gyeongsangbuk-do, 11 for Gyeongsangnam-do, 1 for Daejeon, and 1 for Jeju-do. The physicochemical properties were as follows: pH 8.0, EC 11.6 mS/cm, SS 5,188 mg/L, TKN 847mg/L, ${{NH_4}^+}-N$ 317 mg/L, ${{NO_3}^-}-N$ 170 mg/L, Org-N 360 mg/L, TP 193 mg/L, and TK 2,557 mg/L. The total amount of NPK was 3,596 mg/L. The total amount of N-P-K was as follows: a number of 2 at 1,000-2,000 mg/L (4%), a number of 17 at 2,000-3,000mg/L (37%), a number of 11 at 3,000-4,000mg/L (24%), and a number of 16 at 4,000mg/L or more (35%). Thus, 41% of the mature liquid fertilizers were below the official standard of commercial fertilizer (livestock manure liquid fertilizer) (0.3% of the total amount of N-P-K). Most of the N-P-K total amount showed non-uniform characteristics of low nitrogen and low phosphoric acid due to the potassium concentration. The average heavy metal content in the matured liquid fertilizer was as follows: As, not detected; Cd, 0.01 mg/kg; Hg, not detected; Pb, 0.02 mg/kg; Cr, 0.14 mg/kg; Cu, 6.89 mg/kg; Ni, 0.44 mg/kg; and Zn, 20.70 mg/kg. Thus, the official standard of commercial fertilizer was satisfied in all categories, indicating a safe level.
Keywords
Livestock manure; Liquid fertilizer; Maturity degree; Nutrient contents; Heavy Metal;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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