Electroflotation unitElectroflotation unit for wastewater treatment consists of electroflotator with insoluble anodes, tanks for reagent, pumps, rectifier of 100-150 A with voltage of 15-20 V, sludge collecting system. The module ensures purification after reagent method, flocculation, electrolysis at the initial metal concentration in the waste waters of 20-100 mg/l. Electroflotator ensures removal of Cu2+, Ni2+, Zn2+, Cd2+, Cr3+, Fe2+, Fe3+, Al3+ ions etc. from wastewater of electroplating and printed circuit board production at any ratio of components in the presence of different anions. 
Table.1. Electroflotation system capability Electroflotation module dimension, mm: | | length | 2500 | | width | 1300 | | height | 1300 | Weight, kg | | 200 | Capacity, m3/h | up to | 10 | required pH for wastewater treatment: | | | | nickel | 9,5 - 10 | | copper and zinc | 9 - 9,5 | | aluminium | 6 -7 | | chrome (III) | 9,5 - 10 | | iron (III) | 6,5 -7,5 | | cadmium | 9,5 - 10 | heavy metal ions in blend | 9 - 10 | oils and greases | 6,5 - 8 | Initial concentration, mg/l | not more than | heavy metals | 10 | 100 | suspended solids | 30 | 300 | oils and greases | 50 | 1000 | residual concentration, mg/l | not more than | heavy metals | 0,1 | 1 | suspended solids | 0,3 | 2 | oils and greases | 0,5 | 50 | Power consumption, kW*h/m3 | not more than | 0,5 | Voltage, V | | 24 | DC Current, А | | 100-150 | Lifetime of the insoluble anodes, years | up to | 10 |
Comparative assessment electroflotation equiipment with existing analogs: High efficiency of removal of dispersed phase (as example: for mix of heavy metals hydroxides degree of removal is a=99,9%); High efficiency of removal of oil and emulsions (a>90%); High capacity of equipment (1m2 of equipment per 4m3/h of treated water); Versatility. High efficiency of removal of mixture (as example: heavy metals hydroxides + oil + calcium phosphate); Lack of secondary water pollution; Low power consumption (0,1-0.5 Kwatt-h/m3); Ease of operation activity and automatic mode of operation; Low sediment moisture (94-96%), which it is easier to dewater respectively.
Electroflotation process 
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