Leachate Wastewater From Municipal Solid Waste Landfills Treatment With Application of the GACS Method of Zeologic S.A.


General Information
Leachate generated from municipal solid waste (MSW) landfills, consists a major international environmental issue and a significant pollutant source, which occurs as a natural result of their disposal means at landfills. Leachate wastewater shows high pollutant concentrations, since at them ends up the entire pollutant load which can escape in liquid form, through a landfill.
This particularity, makes them a major pollutant source and for that reason they have to be cast upon a specialized treatment prior of their disposal in the environment.
Pollutants appearing in leachate are heavy metals, hydrocarbons of all kinds, aromatic compounds, phenols, etc. Compounds in general which are highly challenging in managing them, with a high accompanying cost until today.
The GACS Solution (Geochemical Active Clay Sediment)
The Geochemical Method GACS consists an innovative solution on an international level on the subject of treatment and disposal of wastewater produced from landfill leachate among others. The key characteristic of the Geochemical Method GACS is the usage of geopolymer materials, which have the ability to adapt on the characteristics and particularity of any type of waste, thus ensuring a successful treatment with warranty of optimal performance.
Benefits of the GACS Method, on treatment of landfill leachate wastewater against the conventional existing methods can be summarized in the following:
Financial Benefits:
  • Competitive investment cost
  • Significant reduced operational cost
  • Reduced maintenance cost
  • Reduced sludge production
  • Reduced operational time

Environmental Benefits:
  • Heavy metals removal even on high concentrations
  • Effluent complying with legislation
  • Production of inert sludge
  • Use of natural materials
  • Odor removal

Table 1: Chemical analysis of leachate wastewater, conducted prior to and after treatment with the GACS Geochemical Method
Paremeter Measurement Unit Initial Measurement Final Measurement
COD mg/L 24.730 111
BOD mg/L 5.735 20
Total Solids (103ΟC) mg/L 31.224 107,90
Suspended Solids mg/L 519 0,27
Total dissolved solids mg/L 30.335 104,80
Total Nitrogen mg/L 1.430 6,58
Organic Nitrogen mg/L 646 0,69
Ammoniacal Nitrogen mg/L 784 6,57
TOC mg/L 9.879 0,04
Total Phosphorus mg/L 62.25 0,04
Surfactants mg/L 4,22 0,00
pH - 9,70 8,00
Conductivity μS/cm 36.925 1.124
Temperature 0C 25,10 25,10
Smell TON 198 4,00
Turbidity NTU 621 24,00
Chlorides mg/L 5.393 540
Sulphates mg/L 245 1,40
Phenols mg/L 82,30 0,46
Chromium mg/L 1,14 0,01
Magnesium mg/L 6,30 0,061
Manganese mg/L 1,20 0,01
Lead mg/L 2,21 0,02
Cobalt mg/L 5,30 0,05
Iron mg/L 735 5,88
Arsenic μg/L 340 2,72
Cadmium μg/L 2,11 0,00
Cuprum μg/L 477 4,30
Nickel μg/L 1.913 23,90
Zincum μg/L 1006 9,05
Sodium μg/L 1.600 119,70
Potassium μg/L 800 66,50