Volcanic rock biological filtering materials
1. The volcanic rock biological filtering materials are used as the carriers of the biological aerated filter.
The volcanic rock biological filtering materials are used as the carriers of the biological aerated filters.
The volcanic rock biological filtering materials were first used in America. We once imported the materials
for the biological filtering technology, and the technicians developed the biological haydite technology instead
of former expensive technology, but not successfully. Now experts find the good mines of the volcanic rock
biological filtering materials. The materials are granular after choosing, smashing, screening and grinding,
which are made of silicon, aluminum, calcium, sodium, magnesium, titanium, manganese, iron, nickel, cobalt
and molybdenum, etc. The particles are dark red and brown, porous and lightweight, and the sizes of the
particles depend on the requests.
The filtering pools used volcanic rocks are used to process the water from lakes and rivers, wastewater in
municipalities, wastewater in industries, sanitary waste and low concentrated organic wastewater, oil filtering,
etc; the materials can be used as the filter media instead of activated carbon, arenaceous quartz and anthracite
coal, and the materials can be used to deeply process the tail water to reclaimed water standard after the
secondary system of the sewage treatmentplant. The volcanic rock filtering materials have been widely used
by its good filtering processing and cheap prices.
2. Physical microstructure
The physical microstructure of the volcanic rock biological filtering material is tough and porous, which is
suitable for the growth and reproduction of the tiny organisms to form biological membrane. The filtering
pool used volcanic rocks is used to process the water from lakes and rivers, wastewater in municipalities,
wastewater in industries, sanitary waste and low concentrated organic wastewater, oil filtering, etc; the materials
can be used as the filter media instead of activated carbon, arenaceous quartz and anthracite, and the
materials can be used to deeply process the tail water to reclaimed water standard after the secondary system
of the sewage treatmentplant.
3. Chemical microstructure
The Chemical microstructures of the volcanic rock biological filtering materials are as follow: 1) the chemic
al stability of the tiny organisms: the volcanic rock biological filtering materials with corrosion resistance
are too inert to react with the tiny organisms; 2) the surface electrical property and hydrophilicity: there are
ositive charges on the surfaces of the volcanic rock biological filtering materials,
which are suitable for the tiny organisms to fix; the attached tiny organisms grow fast, and the surfaces have
good hydrophilicity; 3) effects on the activity of the biological membrane: As the carriers of the biological
membrane, the volcanic rock biological filtering
materials are no harm and no inhibition to the activity of the tiny organisms fixing on them.
4. Hydraulics
Hydraulics
Hydraulics: 1) porosity: the average porosity of the inside and outside is about 40%, and the resistance to the
water is small; comparing to the same type filtering materials, the demands of the filtering material are lower for
the same purpose; 2) specific surface: large specific surfaces, porous microstructures and inert features are
suitable for the creation of the membranes, the growth of the tiny organisms,
retaining more tiny organisms and the exchanging procedure among the oxygen, the nutrients and the metabolic
waste of the tiny organisms; 3) structures of the materials and the flow pattern of the water: the structures of the
volcanic rock biological filtering materials are smooth granular, and the bubbles are bigger than the haydite, so
the resistance to flow is small, saving the energy.
5. The physical performance parameters of the volcanic rock biological filtering materials
|
Performance
|
Unit
|
Result
|
Performance
|
Unit
|
Result
|
|
Bulk density
|
Kg/m3
|
850
|
Specific surface area
|
M2/g
|
13.6-25.5
|
|
Specific gravity
|
|
1.40
|
Compressive Strength
|
Mpa
|
5.78
|
|
Moisture content
|
%
|
0.9-1.0
|
Shear strengths
|
Mpa
|
3.98
|
|
Porosity
|
%
|
73-82
|
Loss of friction
|
%
|
＜1
|
|
Removal of organic substance
|
%
|
80 Above
|
Membrane time
|
Hours
|
27
|
|
COD removal rate
|
%
|
85 Above
|
The Solubility of the
chlorhydric acid
|
％
|
＜1.0
|
|
BOD removal rate
|
%
|
75-93
|
Dissolved matter
|
a little helpful minerals
and microcomponents
|
|
|
Removal of ammonia and nitrogen
|
%
|
85 Above
|
Appearance
|
plump particles,
ball like
|
6. The chemical constituents of the volcanic rock biological filtering materials
|
Chemical constituents
|
SiO2
|
CaO
|
MgO
|
Fe2O3
|
Al2O3
|
|
Content％
|
43.27
|
9.86
|
1.49
|
11.86
|
14.71
|
7. Packaging: 60*1000mm woven sack, 50 kg
