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Inertization of liquid waste

Alcali activationGeopolymenrLiquid waste inertizationWastewater treatment

Introduction

The present process of inertization does not require any pretreatment of liquid waste and it consists of a cold mixing  of the liquid waste with an appropriate quantity of aluminosilicate powders (of natural origin or arising from industrial waste) and a strongly alkaline solution (also this coming From end-of-waste). Material consolidation takes place within a few hours at room temperature.

Technical features

The invention consists in the chemical formulation of a matrix capable of stabilizing and separating chromium, such as other heavy and non-heavy metals, from the solution. The new product is designed to stabilize liquid wastes, in particular wastes containing soluble chromium salts and some anions, such as chlorides, sulphates and oxalates. The final material appears as an inorganic solid with thermal, chemical and mechanical stability, comparable to that of a stone or ceramic. The chemical inertization process consists of a cold mixing  of the liquid waste with an appropriate quantity of aluminosilicate powders (of natural origin or arising from industrial waste) and a strongly alkaline solution (also this coming From end-of-waste). Material consolidation takes place within a few hours at room temperature.

Possible Applications

  • Cold inertization of liquids, sludge and partially liquid wastes containing dangerous metal cations in order to:
  • Downgrading the landfill for their final disposal;
  • Transformation into marketable artifacts such as self-locking, urban furniture, insulating panels.

Advantages

  • Low energy consumption;
  • Absence of waste pre-treatment such as drying;
  • Absence of pre-treatment of chromium reduction from state (VI) to state (III);
  • Absence of oxidative pre-treatment of organic substances;
  • Absence of gaseous emissions.