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Chemical-physical process for the removal of boron from liquid matrices

Boron removalChemical-physical precipitationPrecipitazione chimico-fisicaRimozione BoroTrattamento acqueTrattamento refluiWastewater treatmentWater treatment

Introduction

A method for the removal of boron from liquid matrices (water or wastewater) by means of a chemical-physical precipitation process that uses low-cost reagents including a solid phase, with sludge characteristics, obtained from the liquid/solid separation phase carried out at the end of a treatment as described in the Italian patent no. 102017000088317.

Technical features

The process is based on immobilization and precipitation mechanisms for the removal of the contaminant from the liquid phase. The boron is stably fixed in an inert solid compound generated during the treatment which is then recovered by simple sedimentation and reused as a reactive in the same boron abatement process. The process can be applied in both batch and continuous conditions reaching boron removal efficiencies up to 70%. In batch applications, the sludge produced during a treatment cycle, after the separation from the liquid and the extraction of the aqueous phase from the system, is kept in the same reactor and used to treat new volumes of liquid. In the case of continuous processes, the sludge is separated into proper units and recirculated continuously within the reaction compartment. The process is under demonstration at an industrial scale (TRL6).

Possible Applications

Removal of boron from:

  • Wastewater from the paper and detergent industry;
  • Hydrocarbon extraction waters;
  • Civil and industrial wastewater;
  • Natural waters.

Advantages

  • Reuse of the mud produced during the treatment;
  • Use of low cost external reagents;
  • Low consumption of external reactants and energy;
  • Minimum quantities of sludge to be disposed of;
  • Limited costs, simplicity of management and environmental sustainability.