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WATER REUSE IN A WET PROCESS HARDBOARD MANUFACTURING PLANT
Citation:
Coda, R. WATER REUSE IN A WET PROCESS HARDBOARD MANUFACTURING PLANT. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/2-78/150.
Description:
Superior Fiber Products, Inc., a manufacturer of smooth on one side wet process hardboard, undertook a project to eliminate any discharge of process water through a program of increasing process water reuse. All but wash up water and some pump seal leak water discharges were eliminated. White water total solids concentration went from 1% to about 7%. Physical properties of the hardboard were watched closely during the close up process. Water absorption and linear expansion of the board increased after close up. Close up of the process reduced chemical usage. Board strength problems were eliminated through control of the white water temperature. Slower drainage of the stock was countered by formation line alterations. Some remaining draw backs to the system are a darker board color and overall reduced cleanliness of the mill.