Recycling in the concrete industry
Nowadays concrete companies are required to install a closed-loop water system. Consequently, many companies invest in systems to thoroughly purify wastewater generated through the washing of products such as pavers or tiles. The resulting integration of water treatment systems into the production process facilitates extensive recycling. Eco-Vision has already completed several such projects, combining flocculation with sedimentation, among other techniques.
Selective sedimentation can help separate the fraction of fine particles from a suspension. This leads to the creation of small flocs, which only grow through gentle agitation. To promote this process, we add a flocculating agent. These high molecular weight substances (polymers) attract smaller flocs, resulting in larger flocs. In the next step of the process, the purified water is “softened” or demineralised, removing calcium and allowing the water to be reused for washing. The water and residue are thus contained in a closed-loop water system. The recovered sludge has a consistent structure. As it is easily mixed into the sand and cement, it can be reused in the production of new concrete. The company is left with nothing to discharge.”