Sewage Handling & Pressure Filtration Equipment (02) 8705 0205

 

Calcite

Introduction

Introduction

Calcite is a crushed and screened white marble media which is an inexpensive solution to effectively neutralise acidic or low pH waters to a neutral, less corrosive effluent.  Calcite is a naturally occuring carbonate media.  Its main advantage is in its self- limiting property.  That is, when properly applied, it is able to correct pH just enough to reach a non- corrosive equilibrium.  Under normal conditions, it will not overcorrect.  When acidic waters come into contact with Calcite, the calcium carbonate is slowly dissolved to raise the pH which reduces the potential leaching of lead, copper and other metals that are typically found in plumbing systems.  Periodic backwashing will prevent packing; will reclassify the bed and maintain high service rates.  Depending on pH, service flow and water chemistry, the Calcite bed will need to be replenished periodically as the Calcite becomes depleted.  

As the Calcite's calcium carbonate neutralises the water, it will increase hardness- meaning that a softener may be necessary after the neutralising filter.

Calcite can be effectively combined with Magnesium Oxide.  This results in an increased ability to correct low pH.

  

 
 

                           

Specifications

Specifications

 Specifications

 

 Colour

Near White 

 Bulk Density

90lb/cu.  

 Mesh Size

16 x 40 

 Specific Gravity

2.7 

 Effective Size

0.4mm 

 Uniformity Coefficient

1.5 

 Hardness

3.0 (Mohs scale) 

 Composition

CaCo3, 95% min.  MgCO3, 3.0% max.

 

Advantages

Advantages

  • Naturally occurring material
  • Low uniformity coefficient for maximum contact for controlled pH correction
  • Slower reacting for controlled pH correction
  • Inexpensive

Conditions for Operation

Conditions for Operation

  • A gravel support bed is recommended
  • Water pH range: 5.0-7.0
  • Freeboard: 50% of bed depth (min.)
  • Backwash rate: 300-500Lpm/m2.
  • Backwash Bed Expansion: 35% of bed depth
  • Service flow rate: 120-250Lpm/m2, but may be modified to adapt to conditions

 Chemical Properties

 Typical Values

 Calcium Carbonate CaCO3

95.00% 

 Magnesium Carbonate MgCO3

3.50%  

 Quartz SiO2

1.20% 

 Aluminium Oxide Al 2O3

0.10% 

 Iron Oxide Fe 2O3

0.10% 

 Potassium as K2O

<10 ppm 

 Sodium as Na2O

0.02% 

 Sulphur as SO3

<10 ppm

 Copper Cu

<1 ppm

 Manganese as MnO

550 ppm

 Phosphorous as P2O5

0.02%

 Nickel Ni

<1 ppm

 Chromium Cr

<2 ppm

 Cobalt Co

<1 ppm