Ceramics-Silikáty 37, (2) 100 - 104 (1993)

The acid waste water, containing for the most part sulphuric, hydrofluoric and hexafluorosilicic acids, is neutralized with an aqueous supension of technical-grade calcium hydroxide (milk of lime). The balance model allows the capacity of interoperation tanks and that of the neutralization reactors to be calculated. The waste water is produced by rinsing chemically polished glass ware with water. The effect of the number of interoperation rinses on the production of acid waste water and on the capacity of interoperation tanks is demonstrated. The model is suitable for small waste water neutralizing stations whose design in this country has till recently been a purely empirical matter. Correct operation of such plants is an indispensable prerequisite for environmental protection of the neighbourhood of glass polishing shops where acid waste water is produced.