Influence of Coagulation Treatment of Water on Equilibrium of Carbonic Acid Forms

Summary

Results of the determination of stability indexes (a saturation index, emission of carbon dioxide into the atmosphere) of the Don water using the results of complete chemical analyses of water made by laboratories at water supply stations are presented. On the example of the Rostov water supply system the advantage of the use of coagulants polyDADMAC both independently and together with aluminium polyoxichloride AQUA-AURAT™10 which don’t increase (comparing with traditional treatment with aluminum sulphate) the corrosive activity of treated water and don’t favour the emission of carbon dioxide into the atmosphere is shown.

Key words

potable water , coagulation , stability , carbon dioxide equilibrium , index of saturation , corrodibility , emission of carbon dioxide

A New Factor of Control of Facilities for Biological Removal of Phosphates from Wastewater

Summary

A new technological indicator making it possible to improve the efficiency and stability of phosphates removal at the facilities of biological treatment of wastewater for biogenic elements – the periodicity of change of phosphates concentration in the end of the anaerobic technological zone – is described. The use of this indicator reflecting the activity of phosphate accumulating bacteria has been assumed as a basis of a new algorithm of control of treatment facilities using the technology of biogenic elements removal and led to improvement of the efficiency of phosphates removal by 1,5–1,7 times.

Key words

biological treatment , aeration tank , efficiency , stability , concentration of phosphates , anaerobic zone , phosphate accumulating bacteria