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Lime applications for

Environment

Soluzioni

Lime for ecology,
always a friend of the environment!

Attention to the environment and its preservation are the challenge of the present and the future. Lime, a natural chemical product developed in perfect harmony with the environment, has been historically used in ecology to address and solve environmental problems.
Water Treatment
Flue Gas Treatment
Waste Treatment
Sludge Treatment
Dredgings

Water Treatment

Lime is used in the treatment of all types of water, both drinking water and wastewater, civil and industrial, to improve the chemical characteristics and to remove specific pollutants before it is transferred to a purification plant or surface water body.
  • Softening
    hard water, that is water rich in dissolved bicarbonates, is softened by using lime which gives rise to insoluble carbonates that can be removed easily
  • pH correction
    lime is a basifying reagent commonly used to raise the pH level of drinking water and wastewater
  • Neutralisation
    lime is a strong base and has a high neutralising capacity for any acids contained in water (sulphuric, hydrochloric, hydrofluoric, nitric, etc.) with a very low specific consumption
  • Metal removal
    lime eliminates the metals contained in wastewater by making them precipitate in the form of insoluble hydroxides, as a function of the pH value
  • Removing sulphur, phosphorus, fluorine
    lime removes the sulphates, phosphates and fluorides present in water by precipitating them in the form of insoluble salts
  • Civilian wastewater
    lime performs multiple tasks: it sanitises grilling residues, reduces BOD and COD in primary sedimentation, mitigates bulking phenomena, flocculates the organic substance precipitating in the form of mud, and precipitates any heavy metals

Flue Gas Treatment

Lime is the most used reagent in the world for treating combustion gases from waste and biomass incinerators, from many industrial plants and from thermal power plants. Its flexibility is also evident in the fact that it can be used, in dry, semi-dry and wet processes.
  • Desulphurisation
    Is the treatment to remove SOx from combustion gas (predominantly from coal-fired power plants), which is realised mainly with wet systems containing lime or calcium carbonate. Hydrated calcium sulphate is obtained as a residue, that is, common gypsum which is used in the construction industry
  • Waste-to-energy plants
    Thermal destruction of waste generates both gases rich in polluting acids, such as HCl, SOx and HF, and organic gases such as dioxins. Lime is the most versatile and easy to use reagent for neutralising acids in full respect of the increasingly restrictive legal limitations
  • Glass and ceramic industries
    Plants with gases mainly characterised by SOx and HF, acid pollutants that can be removed easily with lime with high efficiency and low consumption
  • Cement plants
    High concentrations of SOx that characterise gases from cement plants can be successfully reduced by using lime, both in traditional gas flues and in the furnace
  • Steel mills and foundries
    Melting scrap metal often leads to the formation of acid pollutants and organic micropollutants in flue gas that can be abated using lime and active carbon

Waste Treatment

In waste treatment, lime is a fundamental reagent in the inerting processes of a wide range of waste materials. It can be used successfully in reclamation work, both on site and off site, on different matrices and with different pollutants.
  • Inerting
    Lime, together with other binders, is a fundamental reagent in solidification and stabilisation processes, commonly called inerting, for trapping pollutants in the waste matrix and transforming them into non-hazardous chemical forms
  • Reclamation
    Lime is an economical and easy to manage reagent for land reclamation interventions based on validated methods that guarantee excellent pollutant entrapment and transformation results

Sludge Treatment

Biological sludge constitutes an extremely useful material that can be used in agriculture, but for this purpose it must be chemically and biologically stabilised. Lime makes one of the most effective chemical stabilisations, also recognised at the level of European legislation.
  • Conditioning
    Thanks to its coagulant and flocculant properties, lime is an important reagent in the sludge conditioning process prior to mechanical dehydration
  • Sanitation
    The addition of lime to dehydrated sludge ensures a high degree of biological disinfection: the increase of pH and temperature of the sludge lead to the elimination of any pathogenic load (viruses, bacteria, etc.)
  • Production of defecation chalks
    Current legislation provides for the possibility to transform biological sludge in defecation chalks by adding lime and other reagents. Lime adds the calcium element up to the concentrations required by law are reached

Dredgings

Dredgings are increasingly seen as a resource to be reused, but their management entails problems related to the geotechnical characteristics and/or the presence of organic and inorganic pollutants that can be treated with lime in order to have suitable material for recovery.
  • Mass stabilisation
    Lime, together with other binders, is used for the mass stabilisation technique which aims to making dredging sediments reusable. Lime improves the geotechnical characteristics of these materials and effectively solves the problems related to the presence of specific pollutants
Contact us
WOULD YOU LIKE MORE INFORMATION?
An expert in lime-based product applications in your specific industry can provide you all the information you need.
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