Freeze wastewater treatment is achieved by separating ice crystals formed in wastewater because ice crystals involve no solutes as well as no impurities of the wastewater (1-3). Freeze wastewater treatment involves some advantages: 1) Wastewater including toxic compounds which is difficult to be treated biologically can be treated, 2) Produced ice crystals can be used for a cold heat storage, and 3) A smaller facility is required than that for biological wastewater treatment Especially, using ice crystals from wastewater for a cold heat storage system is quite promising. However, it is currently less developed due to its high initial cost. Freeze wastewater treatment system enable both wastewater treatment and ice cold heat storage at the same time with one facility. In spite of several advantages of the freeze wastewater treatment, it has not yet well developed because of low quality of the ice crystals produced, resulting in insufficient wastewater treatment. In this paper conditions of producing a plate ice were investigated; namely effects of 1) seed ice, 2) flow rates of wastewater on a heat exchange plate, 3) coolant temperature, and 4) initial temperature of wastewater on the ice purity produced.
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