General process scheme of an odour control system
Consisting of an Aerox®-Injector plus an Aerox® Polishing Sieve.
Remarks:
- First remove dust (if required)
- Reduce odour (Aerox-Injector)
- Polishing-Sieve to achieve low emission (optional)
The polishing Sieve can also be installed after the fan.
Testresults:
Petfood : 98% odour reduction
Rapeseed processing: 93,6% odour reduction
Poultry feed: 98,5 % odour reduction
Cacao beans extraction: 97 % odour reduction
Rubber tyre prod. (mixing): 94 % odour reduction
The Aerox Polishing Sieve principle:
the Aerox-Injector is continuously breaking down organic components until they can pass the sieve:
- No negative impact of different process air temperatures: the applied synthetic Zeolites can withstand higher temperatures and humidities up to 95%.
- Longer lifetime: the Aerox-Injector reactive oxygen is continuously oxidizing the organic components that are left behind in the Polishing Sieve.
General introduction Zeolites (molecular sieves)
What are Molecular Sieves?
A Swedish Mineralogist discovered zeolites in 1756. Zeolites are natural minerals that are mined in many parts of the world; most Zeolites used commercially are produced synthetically. The Zeolitic channels (or pores) are microscopically small, and have molecular size dimensions such that they are often termed "molecular sieves".
Zeolites are a group of hydrated aluminosilicates of the alkali or alkaline earth metals (principally sodium, potassium, magnesium and calcium). They have three-dimensional crystalline structures containing (-Si-O-Al-). The silicon and aluminium atoms are tetrahedrally co-ordinated with each other through shared oxygen atoms.
These (-Si-O-Al-) linkages form surface pores of uniform diameter and enclose regular internal cavities and channels of discrete sizes and shapes, depending on the chemical composition and the crystal structure of the specific Zeolite involved. These cavities can host cations, water or other molecules. Because of their regular and reproducible structure, they behave in a predictable fashion.
How were Zeolites formed?
Zeolites are natural volcanic minerals with a number of unique characteristics. Zeolites were formed when volcanic ash was deposited in ancient alkaline lakes. The interaction of the volcanic ash with the salts in the lake water altered the ash into various Zeolite materials.
Properties
The size and shape of the channels have extraordinary effects on the properties of these materials for adsorption processes, and this property leads to their use in separation processes.
Molecules can be separated via shape and size effects related to their possible orientation in the pore, or by differences in strength of adsorption.
By modifying the zeolites the properties of the raw materials can be optimized in order to even improve the working of the material.
For industrial odour control modified and synthetic zeolites are used.
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