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Universal Wastewater Treatment Systems
Each stage in the AECO2
system is independent and can be configured in a matter of minutes to
process any wastewater stream to meet or exceed requirements to Recycle or Reuse
the water within the process from which it was generated
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Stage 1 Electrochemical Coagulation System
Electrochemical Coagulation (EC)
technology offers an alternative to the use of metal salts or polymers and
poly-electrolyte addition for breaking stable emulsions and suspensions. The
technology removes metals, colloidal solids and particles, and soluble
inorganic pollutants from aqueous media by introducing highly charged
polymeric metal hydroxide species. These species neutralize the
electrostatic charges on suspended solids and oil droplets to facilitate
agglomeration or coagulation and resultant separation from the aqueous
phase. The treatment prompts the precipitation of certain metals and salts.
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Stage 2 Ceramic Filter System
- AECOS
ceramic filters remove particles from the water but leaves oxygen and
mineral contents unchanged, which gives water it's spring-like freshness and
taste (not "pure" but wholesome). Pathogens of the most varied diseases
which are reliably filtered from the water include; cholera, typhus,
cryptosporidium, amoebic dysentery, ecoli, colibacillose or bilharzia,
anthrax spores among others. Ceramic filtration technology is often
called "dead-end filtration” and "depth filtration". There are several
mechanisms by which the ceramic element filters out particles as a dead-end
filtration.
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Stage 3 Zeolite or Organo Clay
Adsorption System
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Organophilic clay can
function is as a prepolisher to activated carbon, ion exchange resins, and
membranes (to prevent fouling), and as a post polisher to oil/water
separators, dissolved air flotation (DAF) units, evaporators, membranes, and
skimmers. Organophilic clay powder can be a component or the main staple of
a
flocculent
clay powder. They are excellent adsorbers for the removal of oil,
surfactants, and solvents, including methyl ethyl ketone, t-butyl alcohol (TBA),
and others.
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Stage 4 Activated Carbon Systems
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Activated carbon, also
called activated charcoal or activated coal,
is a form of
carbon that has been processed to make it extremely
porous and thus to have a very large
surface area available for
adsorption or
chemical reactions.
[1] The word
activated in the name is sometimes substituted by
active. Due to its high degree of microporosity, just
one
gram of activated carbon has a surface area of
approximately 500 m˛ (or about 2.17 tennis courts), as
determined typically by
nitrogen gas adsorption. Sufficient activation for
useful applications may come solely from the high surface
area, though further chemical treatment often enhances the
adsorbing properties of the material.
Activated carbon can be used as a substrate for the
application of various chemicals to improve the adsorptive
capacity for some inorganic (and problematic organic)
compounds such as hydrogen sulfide (H2S), ammonia
(NH3), formaldehyde (HCOH), radioisotopes
iodine-131 (131I) and
mercury (Hg). This
property is known as
chemisorption.
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Stage 5 ElectroDialysis System
- Electrodialysis (ED)
is
a membrane process, during which ions are transported through semi permeable
membrane, under the influence of an electric potential.
The membranes are cation- or anion-selective, which basically means that
either positive ions or negative ions will flow through. Cation-selective
membranes are polyelectrolytes with negatively charged matter, which rejects
negatively charged ions and allows positively charged ions to flow through.
By placing multiple membranes in a row, which alternately allow positively
or negatively charged ions to flow through, the ions can be removed from
wastewater.
In some columns concentration of ions will take place and in other columns
ions will be removed. The concentrated saltwater flow is circulated until it
has reached a value that enables precipitation. At this point the flow is
discharged.
This technique can be applied to remove ions from water. Particles that do
not carry an electrical charge are not removed.
Cation-selective membranes consist of sulphonated polystyrene, while
anion-selective membranes consist of polystyrene with quaternary ammonia.
Sometimes pre-treatment is necessary before the electro dialysis can take
place. Suspended solids with a diameter that exceeds 10 µm need to be
removed, or else they will plug the membrane pores. There are also
substances that are able to neutralize a membrane, such as large organic
anions, colloids, iron oxides and manganese oxide. These disturb the
selective effect of the membrane.
Pre-treatment methods, which aid the prevention of these effects are active
carbon filtration (for organic matter), flocculation (for colloids) and
filtration techniques.
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Stage 6 Rotary Drum Vacuum Filters
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Dry Sludge Discharge Filter
– The Rotary Drum Vacuum Filter discharges a Dry Cake (60%) consisting of
the solids mixed with a small portion of the filter media. The filter media
used is a powder form of Perlite.
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Drum |
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Valve |
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Piping |
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Drive |
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Scraper |
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Agitator |
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Tank |
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Cake Formation Zone |
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Cake Predrying Zone |
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Cake Washing Zone |
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Cake Final Drying Zone |
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Cake Discharge Zone |
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Dead Zone |
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All Zones |
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Stage 7 Ultra Filtration
Ultra filtration includes: Hollow Fiber (HF),
Reverse Osmoses (RO) and other technologies designed to remove sub micron
particles from the waste stream.
Stage 8 Sludge
Handling
Light Weight Aggregate Production
All of the solids removed from the waste stream are captured and
removed on the Filter mechanism. The sludge along with the filter media is
mixed with a catalytic binder and extruded to form pellets or aggregate in
kiln to form a light weight aggregate used in the concrete industry.
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