Valorisation of wastewater from two-phase olive oil extraction in fired clay brick production.
Wastewater issued from oil-washing stage (OWW) in the two-phase olive oil extraction method was used to replace fresh water in clay brick manufacture. The extrusion trials were performed with one of the ceramic bodies currently being used in a local brick factory for red facing bricks (RB) production. Fresh water or OWW was added to a final consistency of 2.4 kg/cm(2), the same value as used at industrial scale for this kind of clay mixture. Comparative results of technological properties of facing bricks are presented. Results show that the products obtained with olive oil wastewater are comparable to traditional ones in terms of extrusion performance and technological properties of end products. Even dry-bending strength of the body formed by wastewater improves by 33% compared to fresh water body. In addition, heating requirements can be reduced in the range 2.4-7.3% depending on the final product. This application can alleviate environmental impacts from the olive oil extraction industry and, at the same time, result in economic savings for the brick manufacturing industry.
de la Casa
José A
JA
Cerámica Malpesa, SA Autovía A-4, 23710 Bailén, Jaén, Spain.
Lorite
Miguel
M
Jiménez
Juan
J
Castro
Eulogio
E
D000538:Aluminum Silicates; D000077215:Clay; D003252:Construction Materials; D007220:Industrial Waste / Q000517:prevention & control*; D000069463:Olive Oil; D010938:Plant Oils; D014865:Waste Disposal, Fluid / Q000379:methods*; D014873:Water Pollutants
D000538:Aluminum Silicates; D007220:Industrial Waste; D000069463:Olive Oil; D010938:Plant Oils; D014873:Water Pollutants; D000077215:Clay