engleski

Effluent characteristics from newspaper chemical flotation deinking

In paper recycling industry flotation deinking is one of the most applied technique in which great amount of water and chemicals have been used. According to that, effluents from paper recycling industry can be huge environmental problem. It is of great importance to find a process that will give a good quality of recycled pulp but also effluents with minor inorganic and organic pollution. In this study effluent characteristics from deinking flotation of naturally aged daily newspaper were examined. The influence of chemicals used in three recycling process were compared. In the first recycling process defined deinking chemicals according to INGEDE Method 11 were used. In the second recycling process oleic acid as surfactant and naturally gained alkali, Eco-alkali, were used while the third one was done using the same chemicals as in the first process where sodium hydroxide was replaced with Eco-alkali. The effluents obtained after all chemical flotation deinking processes were analysed by standard analytical methods, in terms of the concentration of the sulphate and nitrate, total organic compound, chemical oxygen demand, pH and electrical conductivity. According to the results it could be conclude is it possible to discharged effluents into the environment without treatment or they need to be pre-treated before discharging into the environment.

effluent characteristics ; deinking chemicals ; deinking flotation ; newspaper

Ovaj rad je u sklopu SuZ financijske potpore istraživanju: “Slama pšenoraži kao izvor vlakanaca u proizvodnji novinskog papira” (voditeljica: izv. prof. dr. sc. Željka Barbarić-Mikočević).