Katalitikus oxidatív szűrőanyag – mangán, vas, ammónia szűrésére – Adatlap
Origin of the raw material:
rhyolite tuff : BBC type
mining area Rátka-VII
1. (K+,Na+, Mn++++)-Clinoptilolite = (K,Na,Mn)6+[(AlO2)6(SiO2)30] . 24 H2O
2. active volcanic glass: [SiO2]x,
3. disperse manganese-dioxide: MnO2
For filtration of drinking water. For elimination of iron, manganese, arsenic, ammonia, heavy metals and some other contaminants.
|Lookout:||dark-brown mineral grains of 1-2 mm of grain-size|
|Ion-exchange capacity for ammonium:||500-1000 mg/kg|
|Mn(II) elimination capacity||12000 mg/kg|
|Iron(II) elimination capacity||30000 mg/kg|
|Other elements, can be absorbed||As|
|Max.filtration speed||30 M/h|
|Density of grains, in water||1,2 g/cm3|
|Bound water in grains||31,2 v.%|
|Free, moving water between grains||29,2 v.%|
|Total water absorbed in 1 Lit. of absorbent||60,4 v.%|
|absorption of water-vapor||7.5 m. %|
|Internal surface||100-120 m2/g|
|Intragranular porosity||16 v.% ( 0.19 cm3/g )|
|Enthalpy change by rehydratation||52 J/g|
|Heat resistance||700 K|
|Izzítási veszteség||7,11 %|
Content of manganese-dioxide in dry weight of KLINOMANGAN: 9 %
|Clinoptilolite||min.40 % (average: 55 %)|
|Feldspars||max. 10 %|
|Christobalite||max. 15 %|
|Montmorillonite||max. 10 %|
|Surface-active volcanic glass||max. 40 %|
|Inert volcanic glass||max. 15 %|
|Oxides of iron and manganese||max. 3 %|
KLINOMANGAN is a natural mineral filtering media with high content of manganese-dioxide. The MnO2 is very disperse. A special technique is applied for binding of manganese dioxide on the surface and micro-pores of the zeolite. There is only a very low concentration of colloidal particles getting away from the media in the water, using this novel technique.
Manganese is present in the KLINOMANGAN in two forms: in form of manganese dioxide and in ionic form in the crystalline structure of zeolite. Both of forms are able to participate in red-ox reactions.
The manganese ions bound in the zeolite are removable, those can be replaced by alkali cations and can occur in the filtered water if the salt-concentration of filtered water is very high. The media can’t be regenerated with caustic liquids.
KLINOMANGAN oxidizes bivalent iron and manganese of raw water, fine precipitation of iron- and manganese oxides- hydroxides will formed after this process. These colloids will be filtered out with this same KLINOMANGAN media which can be washed back as general. In the same time with oxidization, the tetravalent manganese in KLINOMANGAN will be reduced to bi- and trivalent form.
When all manganese with higher charge are reduced, the media is exhausted. The regeneration can be proceeded by 4 % solution of potassium-permanganate or sodium-permanganate which re-oxidizes the manganese of KLINOMANGAN and refreshes the active surface. The backwash can last longer as in general, after this process.
The KLINOMANGAN media absorbs arsenic as well after former oxidation. Oxidation with ozone is advantageous to accelerate the oxidation of manganese and arsenic. The red-ox reaction of arsenic acid is : H3AsO4 + 2H+ + 2e- —> H3AsO3 + H2O Eo = + 0.56V . at pH 7 . When the arsenite-arsenate ratio is 50-50%, this value is +0,14 V and at 99% of arsenate ratio it is +0,206 V. The speed of conversion in this reaction is only 25-30 % in 24 hours. The oxidizing process of arsenite to arsenate: 3H3AsO3 + O3 a 3 H3AsO4. H3AsO4 + Fe(III)-Zeolite a Fe(III)AsO4 + H-Zeolite.
The KLINOMANGAN containing iron binds the arsenate (solubility of FeAsO4 is 4.0 ×10-36, manganese-arsenate: (Mn3(AsO4)2 : 1,9 ×10-11).
The KLINOMANGAN can’t be overloaded with precipitates of iron and manganese, because the arsenic absorption capacity will decrease than. If there is too high iron content of the raw water (5 ppm or more), sand pre-filter can to be used before KLINOMANGAN media to avoid the unpleasant clogging.
KLINOMANGAN can filter only water without solved gaseous content. An adequate gas elimination technique has to be used before KINOMANGAN media filter.
In original packing KLINOMANGAN is sterile. It is burned. It contains disperse silver-oxide fixed in the structure of zeolite, though it has bactericide and fungicide effect. Nevertheless, time-by-time it can be sterilized with potassium-permanganate solution or by washing back with water, containing dissolved ozone. The treatment with ozone can’t last long time. Application of solution containing combination of silver-salt – hydrogen-peroxide for regeneration is not allowed, the fine manganese-oxide dispersion can be damaged and the media will dissolve manganese ions in to the filtered water.
The KLINOMANGAN is excellent absorber of ammonium. Elimination of ammonium, iron and manganese can be achieved at once, in one technological step. The ammonium level of concentration can decrease under 0,1 mg/Lit. and the iron and manganese conc. will as low as 0,01 mg/Lit. The capacity of absorption for ammonium – until keeping low outlet-concentration – is between 500 and 1000 mg ammonium/kg of KLINOMANGAN. The total capacity is much higher, but the outlet ammonium concentration will increase later.
The regenerating solution has to be 5 % solution of NaCl. The regeneration with salt solution regenerates only the absorption capacity of ammonium ions. Regeneration with permanganate has to follow the regeneration with salt, to restore the oxidizing capacity of KLINOMANGAN.
Effect for ambiance:
The KLINOMANGÁN is harmless for human health. It doesn’t contain toxic or organic materials.
It doesn’t dissolve in water. Partly it dissolves in strong acidic or alkaline solutions. It is not flammable.
The used filter media can contain toxic heavy metals absorbed in the crystalline structure. It is not allowed to dispose as general, it has to be treated as hazardous waste.
The sludge coming from the KLINOMANGAN media by regenerating or backwash can be toxic, if arsenic or other heavy metals are released. It has to be treated as hazardous waste.