Abstract
Concerning the fluidity of disposer drainage in the plumbing, the Japanese approved system is not equal as the already popularized system in USA. For the Japanese system, drainage in the plumbing is only for disposer and kitchen drainage and disposer operation is batch garbage feed. On the other hand for USA, the all-household drainage is fluidized in the plumbing and disposer operation is continuous garbage feed. Then, the effect of disposer operation mode, water feed condition and disposer type on the fluidity of the disposer drainage was investigated to clarify the influence of the Japanese disposer installed condition on the plumbing. The fluid velocity was not affected by the crashed particle diameter, which was varied by the disposer type, but strongly affected by the solid concentration in the drainage, which was determined by the disposer operation and water feed concentration. The batch feed operation was found to increase the solid concentration several times higher than the continuous, and reduce the fluidity. The programmable water feed for the disposer to reduce the solid concentration, attained the fluid velocity as equal as the continuous operation.
