Abstract
Using electrocoagulation (EC) as a new method to treat boron containing effluent/wastes has been studied. With combined mechanisms of adsorption and precipitation, the EC is very effective to remove boron; 82% of boron from model waters ([B]0 = 250–500 mgL!1) can be removed at a current density of 62.1 Am!2 (equivalent to 3.3 as molar ratio of Al:B). In the treatment of industrial effluents, the EC can effectively remove boron and arsenic simultaneously, the [As] was reduced from 15 to 99.9%, i.e., after the fifth stage EC treatment, boron concentration can be decreased from 500 mgL!1 to less than 0.5 mgL!1. Chemical adsorption with freshly formed Al(OH)3 flocs played a dominant role in the removal of boron from the wastes. Pre-pH adjustment was not necessary with the EC in the treating of low pH wastes, whilst all other technologies need to raise the solution pH to neutral status.
Original language | English |
---|---|
Pages (from-to) | 131-138 |
Number of pages | 8 |
Journal | Desalination and Water Treatment |
Volume | 2 |
Issue number | 1-3 |
Publication status | Published - 1 Jan 2009 |
Keywords
- wastewater
- adsorption
- electrocoagulation
- boron removal