Waste Water Purifying at the Laundry by Means of Active Carbon

Abstract

The protection of surface and underground water, and communal infrastructure is closely connected with the “Decree of mass and heat emission at the removal of waste water from the pollution source and discharge into Surface Water and into the Sewage system”. In this research, the waste water from two laundries was analysed which can be differentiated by the origins of the washed clothes and waste water flow. By using chemical analyses it was found out that some parameters values are exceeded in regard to the Decree of mass and heat emission at removal of waste water from pollution source (UL RS št.35/ 96). An attempt was made to find a technological procedure for waste water treatment which will meet the statutory regulations. It was decided to treat the waste water with adsorption on powder-activated carbon (PAC) and granular-activated carbon (GAC). It was found that adsorption on PAC with preliminary flocculation using aluminium sulphate was sufficient to attain good quality waste water which can be released directly from the laundry using low water flow into the river. The same technological treatment is unsuitable in a laundry with high flow due to the high expenses. In this case adsorption on GAC was shown to be very successful.