STABILIZATION OF BLUE MUSSEL (MYTILUS EDULIS L.) PROCESSING WASTE WITH Ca(OH)_2

摘要

Mussel processing waste (MPW) is often treated as landfill or casually applied to soil. Leachate and odour problems associated with even short-term storage make land application difficult. Work was initiated to examine MPW stabilization via addition of hydrated lime (Ca(OH)_2) with effectiveness rated through degree of liquefaction, change in pH, and CO_2 evolution. For assessment of liquefaction and pH, Ca(OH)_2 was combined with fresh MPW at 1%, 5% and 10% (w:w) with control of no lime. For assessment of CO_2 evolution, MPW with 2% Ca(OH)_2 (w:w) was compared to fresh MPW, liquid fraction of MPW, and liquid hog manure. Materials were contained in 20 L plastic containers with variables measured after seven days. Liquefaction (g produced/litre of waste) was 89, 45, 7.5, and 0, for control, 1%, 5%, and 10% treatments, respectively. The 5% and 10% treatments had significantly higher pH (～11 and ～12) compared to the 1% and control treatments (both ～6.0). The lime-treated MPW emitted less CO_2 (1.22 g L~(-1) d~(-1)) than the fresh (2.95) and liquid (5.02) MPW. A small amount of added Ca(OH)_2 can provide short-term stabilization of MPW and increase its usability for agriculture.