Nutritive Quality of the Crude Organic Fertilizer Produced with Coastal Aquaculture-Ground Bottom Sediments, Organic Wastes and Alkaline Stabilizers

유기성 폐기물과 알칼리 안정화제가 첨가된 연안 양식장 퇴적물 조비료의 영양성분 조성

  • 김정배 (국립수산과학원 환경관리과) ;
  • 강창근 (국립수산과학원 환경관리과) ;
  • 이근섭 (부산대학교 생물학과) ;
  • 박정임 (부산대학교 생물학과) ;
  • 이필용 (국립수산과학원 환경관리과)
  • Published : 2002.12.01


To utilize coastal aquaculture ground bottom sediment in which concentrations of harmful pollutants are low and organic content is high as an organic fertilizer alkaline stabilizers such as CaO, Oyster shell, Mg(OH)$_2$ were added to the bottom sediment organic additives of livestock or food wastes. Nutritive qualities of crude fertilizers were measured to examine effects of alkaline stabilizers and organic waste additions. The Mg(OH)$_2$-added crude fertilizer had significantly lower total carbon(T-C) and nitrogen(T-N) content, reflecting the dilution effect due to great amount of Mg(OH)$_2$ addition. However, the addition of oyster shell had no significant effect on the T-C and T-N content of the fertilizer. $P_2O_5$ and $K_2$O content was considerably higher in the mixed sample of aquaculture ground bottom sediments and livestock wastes than in the mixture of the sediments and food wastes, resulting from higher $P_2O_5$ and $K_2$O content in livestock wastes. Addition of Mg(OH)$_2$ increased the content of MgO In the crude fertilizer but significantly reduced the content of other nutritive elements such as $P_2O_5$, $K_2$O and CaO. Addition of oyster shell as an alkaline stabilizer seemed to have the advantage of saving time and expenses far dryness due to its role as a modulator of water content. Moreover, additions of effect Mg(OH)$_2$ decreased the concentrations of heavy metals in the fertilizer by the dilution while additions of oyster shell had no influence on heavy metal concentrations in the fertilizer.


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