The wastewater from production and filling of mineral waters and soft drinks is pre-treated mechanically by a screen and buffered in an aerated mixing and balancing reactor.
After equalization of flow and load the wastewater is given to the biological reactors where organic substances as sugar and other organic compounds are decreased by biological activity of microorganisms.
The separation of activated sludge takes place inside a funnel-shaped clarification and the sedimented sludge is given back to the biological system by wear-less, high economic air-lift pumps.
The integrated Process essentially contributes the aerobically digestion of sludge and assures a high safety and stabilization in process operation.
Characteristics of Soft Drink Waste Waters:
The wastewater is a heterogeneous mixture of chemicals including sucrose, maltose, lactose, levulose, glucose, fructose etc., artificial sweetener, fruit juice concentrates, flavoring agents (fruit cells, kola bean extract, vanilla, tonka, oil of sassafras), carbon dioxide, bicarbonates, coloring agents (caramel, synthetic dye-stuff), ethylenediaminetetraacetic acid (EDTA), 1,2-propanediol, gum arabic, preservatives (phosphoric acid, tartaric acid, sodium benzoate, citric acid,) and mineral salts used in manufacturing operations (Ghosh and Henry, 1981)
The average Specific Pollution Load (SPL) was found to be 4 kg COD /m3 of soft drink waste waters.
The target for TDS should be set at 5 kg TDS/m3 soft drink for plants with bottle-washers and 1.5 kg TDS/m3 soft drink for plants without bottle-washers.
Prior to balancing or discharge, soft drink effluent should undergo solids removal to prevent labels, can, bottle lids and other solids from entering the effluent stream.
This can be done by using the simple manually cleaned screens or the more sophisticated rotary, vibrating or static wedge wire types.