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Change of Characteristics during Organic Liquid Fertilizer Processing using Ascidian Tunic

우렁쉥이 껍질을 이용한 유기 액비 제조시 발효액의 특성 변화

  • Received : 2014.08.13
  • Accepted : 2014.09.24
  • Published : 2014.12.31

Abstract

This study was carried out to investigate the characteristics of the organic liquid fertilizer and find out optimum fermentation conditions of Effective Microorganisms (EM) including ascidian tunic. During the EM fermentation by adding ascidian tunic, electrical conductivity (EC) was increased, contrast to decrease the pH value, on related to the initial dosage molasses rate. Additionally, the total nitrogen quantity was shown to be increased on EM fermentation and the most effective increasing was recorded up to 220% on more than 15% molasses dosage condition. The phosphorus quantity was to be maximum rate on 21th of EM fermentation, and other contents, such to potassium, calcium, magnesium, sodium, had be shown an increasing patten during the fermentation period. After the EM fermentation, the concentration of hazardous material (Zn, As, Cd, Cu, Cr, Hg, Ni, pb) was measured below than the official criteria for commercial fertilizer. As a effective material in fermentated fertilizer, the 29 kinds free amino acids were detected and their total concentration was measured to 7080.94 mg/L.

폐자원인 우렁쉥이 껍질을 이용한 환경친화형 유기농 액비의 개발을 위하여 유용미생물(EM)을 이용한 우렁쉥이 껍질의 최적 발효조건과 액비의 특성을 조사한 결과 다음과 같다. EM발효 우렁쉥이 껍질 액비 제조 시 당밀의 투입량이 증가할수록 pH는 낮아지며, EC는 높아지는 것으로 나타났으며, pH는 당밀이 10% 이상 투입된 시험구에서 일정하게 유지되었다. EM발효 우렁쉥이 액비의 총 질소 함량은 발효가 경과할수록 현저히 증가하였으며, 특히 당밀이 15% 이상 투입된 시험구에서 약 220% 증가율을 나타내었다. 인의 함량은 발효 21일차에서 최고치를 나타내었으며, 칼륨의 함량은 발효가 경과할수록 증가하였다. 칼슘, 마그네슘, 나트륨의 함량 역시 발효가 경과할수록 증가하였고 당밀이 15% 이상 투입된 시험구에서 증가율이 우수한 것으로 나타났으며, 칼슘의 함량이 상대적으로 높은 것으로 나타났다. 유해성분(As, Cd, Cu, Cr, Hg, Ni, pb 및 Zn)의 함량은 시험구 모두에서 비료공정규격 기준치에 적합하였다. 우렁쉥이 껍질 액비의 유리아미노산은 총 29종이 검출되었으며 총량은 7,080.94 mg/L를 나타내었고 알라닌이 656.32 mg/L로 가장 높은 함량을 나타내었다. 이상의 결과를 미루어 볼 때 우렁쉥이 껍질을 이용한 액비화에는 당밀이 15% 이상 투입된 조건이 최적인 것으로 판단된다.

Keywords

References

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