Development of disposal method of sweet potato shochu distilled slops by water jet process

The protocol of London in l993 put shochu distillers under an obligation to quit ocean dumping ofdistilled slops by 2000. However这是非常不同的，因为在土地上的垃圾treatment because distilled slops of sweet potatoshochu has around 50,000 of BOD. Potato cells that one of the main solid portion in slops float influid just like balloon with much amount of water. Thereforethe obtained solid fraction after liquid-solid分离treatmentcentrifugal decantation，contains 90% of water. This fact indicates that the separated solid waste is perishable and isdifficult consecutive utilization until new disposal method development. This study focused on the改善liquid-solid separation efficiency by crushing the cells floating in waste fluidusing the newly developed water jet crusher Pumped out slops fluid is led to collide by frontalclash at 250 - 1000kgf /cm - D12 - D1. As a result of the observation with microscope，the number of crashed cells increased with increasing extruding pressure and almost of allcells were crashed at l000 kgf/cm - D12 - D1. Water jet treated slops fluid showed more than two timeshigher dehydration speed at filter press test. Obtained dehydrated cake只有45% of water.Flocculation and centrifugal separation While there有时在水喷射treated slops. While therelittle difference with intact fluid on solid-liquid separation efficiencyan important findings the chitosan flocculant effectively coagulates at one tenth concentrationpoly-aluminum chloride （PAC）。

The protocol of London in l993 put shochu distillers under an obligation to quit ocean dumping of distilled slops by 2000. However, it is very difficult to cry out the waste treatment on land because distilled slops of sweet potato shochu has around 50,000 of BOD. Potato cells that one of the main solid portion in slops float in fluid just like balloon with much amount of water. Therefore, the obtained solid fraction after liquid-solid separating treatment, represented by centrifugal decantation, contains 90% of water. This fact indicates that the separated solid waste is perishable and is difficult consecutive utilization until new disposal method development. This study focused on the improvement of liquid-solid separation efficiency by crushing the cells floating in waste fluid using the newly developed water jet crusher. Pumped out slops fluid is led to collide by frontal clash at 250 - 1000 kgf/cmィイD12ィエD1. As a result of the observation with microscope, the number of crashed cells were increased with increasing extruding pressure and almost of all cells were crashed at l000 kgf/cmィイD12ィエD1. Water jet treated slops fluid showed more than two times higher dehydration speed at filter press test. Obtained dehydrated cake has only 45% of water. Flocculation and centrifugal separation were also performed on water jet treated slops. While there was little difference with intact fluid on solid-liquid separation efficiency, an important findings that the chitosan flocculant effectively coagulates at one tenth concentration of poly-aluminum chloride (PAC).