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Electroflotation in wastewater treatment
Electroflotation unit is the equipment for industrial wastewater treatment from heavy metals, oil, surfactants and suspended solids.
Electroflotation is a process of floating of pollutants to water surface by tiny bubbles of hydrogen and oxygen gases generated from water electrolysis. Therefore, the electrochemical reactions at the cathode and anode are hydrogen evolution and oxygen evolution reactions, respectively.
Electroflotation module consists of electroflotator with insoluble electrodes, tanks for alkali and flocculant solutions, pumps, rectifier of 100-150 A with voltage of 24 V, sludge collecting system (Skimmer). The module ensures water treatment after pH-correction and flocculation at the initial metal concentration in the waste waters of 10-100 mg/l and suspended solids concentration up to 300 mg/l.
Figure 1. Electroflotation unit with capacity 10 м3/h, Russia, Moscow, Plating plant WWTP
The unit ensures removal of Cu2+, Ni2+, Zn2+, Cd2+, Cr3+, Fe2+, Fe3+, Al3+ ions etc. from wastewater of plating and printed circuit board production at any ratio of components in the presence of different anions.
Electroflotation unit made of polypropylene, high-reliability equipment. Capacity for one module is from 1 to 50 m3/h.
Table.1. Electroflotation system capability
Comparative assessment electroflotation equiipment with existing analogs:
Figure 2. Wastewater treatment process using electroflotation
It is recommended to use electroflotation module as a main equipment for industrial WWTP (waste water treatment plants) specially for electroplating industry (metal finishing industry) and circuit board production.
Video 1. Electroflotation unit with capacity 5 m3/h work as the main equipment on the wastewater treatment plant
Technology and equipment were successfully implemented and tested in Russian Federation for more than 60 industrial enterprises. The delivery of pilot equipment to USA, Canada and Italy was realized.