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Advanced
Biological Waste Water
Treatment and Sewage |
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Leading
the way to the future, today!
We manage four basic Programs or Divisions:
Click on any link to learn more.
1.
Advanced Biological Wastewater Treatment and Sewage
2.
High Purity Distilled Water, Water Recovery and Treatments
3.
Alternative Energies, Solar, Propane and Electric Energy Generation
4.
Custom Designed Traditional to Modern Pacific Islander Buildings |
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Advanced Waste Water
Treatment
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A brief discussion
of the different types of waste treatment to help you narrow your
choices.
Package Plants and Batch Reactors for communities.
In order to use
less space, treat difficult waste, deal with intermittent flow or
achieve higher environmental standards, a number of designs of hybrid
treatment plants have been produced. Such plants often combine all or at
least two stages of the three main treatment stages into one combined
stage. In the UK, where a large number of sewage treatment plants serve
small populations, package plants are a viable alternative to building
discrete structures for each process stage.
The most
advanced packaged treatment plant according to a study done by the
University of California at Davis for the California State Water
Resources Control Board for treating waste and nutrients (phosphorus and
nitrogen) in one step economically is the USBF (Upflow Sludge Blanket
Filter). The USBF process is a modification of the conventional
activated sludge process that incorporates an anoxic selector zone and
an upflow sludge blanket filtration clarifier all in one integrated
bioreactor vessel. The treatment includes efficient reduction of BOD5
and TSS but also biological nutrient removal (BNR) by the processes of
denitrification and "biological luxury uptake". The ensuing
compact, modular system takes up less space and contains very few moving
parts. The result is an efficient, highly affordable wastewater
treatment plant with low maintenance and operating costs.
USBF technology
has no inherent capacity limits and is used in a wide range of
applications from subdivisions, resorts and municipalities, to
agricultural and industrial sites. Plants can be retrofitted and
expanded from existing sites reducing capital costs. Since there are no
mechanical parts and no chemicals needed, operations cost are much less
than sequencing batch reactor and membrane bio reactor systems.
Another type
of process which combines secondary treatment and settlement is the Sequencing
Batch Reactor (SBR). Typically, activated sludge is mixed with raw
incoming sewage and mixed and aerated. The resultant mixture is then
allowed to settle producing a high quality effluent. The settled sludge
is run off and re-aerated before a proportion is returned to the head of
the works. SBR plants are now being deployed in many parts of the world.
The
disadvantage of such processes is that precise control of timing, mixing
and aeration is required. This precision is usually achieved by computer
controls linked to many sensors in the plant. Such a complex, fragile
system is unsuited to places where such controls may be unreliable, or
poorly maintained, or where the power supply may be intermittent.
Package plants
may be referred to as high charged or low charged. This refers to the
way the biological load is processed. In high charged systems, the
biological stage is presented with a high organic load and the combined
floc and organic material is then oxygenated for a few hours before
being charged again with a new load. In the low charged system the
biological stage contains a low organic load and is combined with
floculate for a relatively long time. |
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Membrane Biological
Reactors
Membrane Biological
Reactors (MBR) combines activated sludge treatment with a membrane
liquid-solid separation process. The membrane component utilizes low
pressure microfiltration or ultra filtration membranes and eliminates
the need for clarifaction and tertiary filtration. The membranes are
typically immersed in the aeration tank (however, some applications
utilize a separate membrane tank). One of the key benefits of a membrane
bioreactor system is that it effectively overcomes the limitations
associated with poor settling of sludge in conventional activated sludge
(CAS) processes. The technology permits bioreactor operation with
considerably higher mixed liquor suspended solids (MLSS) concentration
than CAS systems, which are limited by sludge settling. The process is
typically operated at MLSS in the range of 8,000–12,000 mg/L, while
CAS are operated in the range of 2,000–3,000 mg/L. The elevated
biomass concentration in the membrane bioreactor process allows for very
effective removal of both soluble and particulate biodegradable
materials at higher loading rates. Thus increased Sludge Retention Times
(SRTs)—usually exceeding 15 days—ensure complete nitrification even
under extreme cold weather operating conditions. The cost of building
and operating a MBR is usually higher than conventional wastewater
treatment, however, as the technology has become increasingly popular
and has gained wider acceptance throughout the industry, the life-cycle
costs have been steadily decreasing. As well, in developed urban areas
where the footprint of the treatment plant is considered a limiting
factor MBR facilities can be considered a desirable option. |
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Waste Removal
Wastewater may
contain high levels of the nutrients nitrogen and phosphorus. Excessive
release to the environment can lead to a build up of nutrients, called
eutrophication, which can in turn encourage the overgrowth of weeds,
algae, and cyanobacteria (blue-green algae). This may cause an algal
bloom, a rapid growth in the population of algae. The algae numbers are
unsustainable and eventually most of them die. The decomposition of the
algae by bacteria uses up so much of oxygen in the water that most or
all of the animals die, which creates more organic matter for the
bacteria to decompose. In addition to causing deoxygenation, some algal
species produce toxins that contaminate drinking water supplies.
Different treatment processes are required to remove nitrogen and
phosphorus.
Nitrogen
Removal
The removal of
nitrogen is effected through the biological oxidation of nitrogen from
ammonia (nitrification) to nitrate, followed by denitrification, the
reduction of nitrate to nitrogen gas. Nitrogen gas is released to the
atmosphere and thus removed from the water.
Nitrification
itself is a two-step aerobic process, each step facilitated by a
different type of bacteria. The oxidation of ammonia (NH3) to nitrite
(NO2−) is most often facilitated by Nitrosomonas spp. (nitroso=ammonium).
Nitrite oxidation to nitrate (NO3−), though traditionally believed
to be facilitated by Nitrobacter spp. (nitro=nitrite), is now known to
be facilitated in the environment almost exclusively by Nitrospira spp.
Denitrification
requires anoxic conditions to encourage the appropriate biological
communities to form. It is facilitated by a wide diversity of bacteria.
Sand filters, lagooning and reed beds can all be used to reduce
nitrogen, but the activated sludge process (if designed well) can do the
job the most easily. Since denitrification is the reduction of nitrate
to dinitrogen gas, an electron donor is needed. This can be, depending
on the wastewater, organic matter (from feces), sulfide, or an added
donor like methanol.
Sometimes the
conversion of toxic ammonia to nitrate alone is referred to as tertiary
treatment.
Phosphorus Removal
Phosphorus can
be removed biologically in a process called enhanced biological
phosphorus removal. In this process, specific bacteria, called
polyphosphate accumulating organisms, are selectively enriched and
accumulate large quantities of phosphorus within their cells (up to 20%
of their mass). When the biomass enriched in these bacteria is separated
from the treated water, these biosolids have a high fertilizer value.
Phosphorus
removal can also be achieved by chemical precipitation, usually with
salts of iron (e.g. ferric chloride) or aluminum (e.g. alum). The
resulting chemical sludge is difficult to handle and the added chemicals
can be expensive. Despite this, chemical phosphorus removal requires
significantly smaller equipment footprint than biological removal, is
easier to operate and can be more reliable in areas that have wastewater
compositions that make biological phosphorus removal difficult.
Disinfection
The purpose of
disinfection in the treatment of wastewater is to substantially reduce
the number of microorganisms in the water to be discharged back into the
environment. The effectiveness of disinfection depends on the quality of
the water being treated (e.g., cloudiness, pH, etc.), the type of
disinfection being used, the disinfectant dosage (concentration and
time), and other environmental variables. Cloudy water will be treated
less successfully since solid matter can shield organisms, especially
from ultraviolet light or if contact times are low. Generally, short
contact times, low doses and high flows all militate against effective
disinfection. Common methods of disinfection include ozone, chlorine, or
ultraviolet light. Chloramine, which is used for drinking water, is not
used in wastewater treatment because of its persistence.
Chlorination remains the most common form of wastewater
disinfection in North America due to its low cost and long-term history
of effectiveness. One disadvantage is that chlorination of residual
organic material can generate chlorinated-organic compounds that may be
carcinogenic or harmful to the environment. Residual chlorine or
chloramines may also be capable of chlorinating organic material in the
natural aquatic environment. Further, because residual chlorine is toxic
to aquatic species, the treated effluent must also be chemically
dechlorinated, adding to the complexity and cost of treatment.
Ultraviolet (UV) Light can be used instead of chlorine,
iodine, or other chemicals. Because no chemicals are used, the treated
water's taste is more natural and pure as compared to other methods. UV
radiation causes damage to the genetic structure of bacteria, viruses,
and other pathogens, making them incapable of reproduction. The key
disadvantages of UV disinfection are the need for frequent lamp
maintenance and replacement and the need for a highly treated effluent
to ensure that the target microorganisms are not shielded from the UV
radiation (i.e., any solids present in the treated effluent may protect
microorganisms from the UV light). In the United Kingdom, light is
becoming the most common means of disinfection because of the concerns
about the impacts of chlorine in chlorinating residual organics in the
wastewater and in chlorinating organics in the receiving water.
Edmonton, Alberta, Canada also uses UV light for its water treatment.
Ozone O3 is generated by passing oxygen O2 through a high
voltage potential resulting in a third oxygen atom becoming attached and
forming O3. Ozone is very unstable and reactive and oxidizes most
organic material it comes in contact with, thereby destroying many
pathogenic microorganisms. Ozone is considered to be safer than chlorine
because, unlike chlorine which has to be stored on site (highly
poisonous in the event of an accidental release), ozone is generated
onsite as needed. Ozonation also produces fewer disinfection by-products
than chlorination. A disadvantage of ozone disinfection is the high cost
of the ozone generation equipment and the requirements for highly
skilled operators.
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The
Septic Tank.
A septic tank is a large, underground, watertight container, typically
about 9 feet long, 4-5 feet wide and 5 feet tall that is connected to
the home’s sewer line. While typically designed with a 1,000-gallon
liquid capacity, the size of the tank is legally determined by the
number of bedrooms in the home. Septic tanks may be rectangular or
cylindrical and may be made of concrete, fiberglass or polyethylene.
Raw
waste water from the bathroom, kitchen and laundry room flows into the
tank where the solids separate from the liquid. Light solids, such as
soap suds and fat, float to the top and form a scum layer. This layer
remains on top and gradually thickens until you have the tank cleaned.
The liquid waste goes into the drain field, while the heavier solids
settle to the bottom of the tank where they are gradually decomposed by
bacteria. But some non-decomposed solids remain, forming a sludge layer
that eventually must be pumped out.
Septic
tanks may have one or two compartments. Two-compartment tanks do a
better job of settling solids and are required in some areas for new
installations. Tees or baffles at the tank’s inlet pipe slow the
incoming wastes and reduce disturbance of the settled sludge. A tee or
baffle at the outlet keeps the solids or scum in the tank. All tanks
should have accessible covers for checking the condition of the baffles
and for pumping both compartments.
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NOT
YOUR GRANDMOTHER'S COMPOSTING TOILET |
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Waterless
Remote Composting Toilet Systems come with an attractive, low
profile bathroom toilet that is optionally available in a multitude of
beautiful colors, each with a solid oak seat, and comes standard in
white. This deluxe toilet is manufactured from durable, easy-to-clean,
high gloss HDPE plastic (high density polyethylene plastic) and will
provide many years of trouble-free service. Waterless toilets feature a
removable bowl for easy cleaning! Another benefit is the increased
capacity of the remote waste reduction system, rated for up to ten
persons per day (depending on power type) and additional guests from
time to time.
Features:
Reduces
and recycles waste into compost
Clean,
sanitary and odor-free
Dual
Fans
Unique
removable bowl design on Waterless Toilet for easy cleaning
Installs
quickly and easily
Lifetime
Warranty on body
5-Year
Warranty on all internal components
Waterless
Toilet available in many colors
Easy
to remove Works-in-a-Drawer Service Module |
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Features
two fans (others have only one) and an aeration basket. These dual
fans, operating in conjunction with natural microbe action, continuously
circulate a large volume of air at a high flow rate around a specially
shaped aeration basket. The aeration basket lines the inside of the
system and maximizes waste surface area for better efficiency. Our
breakthrough technology dramatically improves both waste reduction and
recycling by increasing aeration, evaporation and microbe activity. This
patented design allows for significant reduction of the system size,
while still maximizing system performance.
This
superior system makes operation both convenient and simple, and
eliminates the tiresome turning of waste required by some "manual
drum" toilets.
Clean,
Sanitary and Odor-Free!
There
are no bathroom odors. Our toilet systems feature an easy to clean,
sanitary bowl design and trap that easily opens and closes for use.
Waterless systems even have a removable bowl for easier cleaning.
Aeration
basket Operation is Easy
When
you install your Waterless system, you add aerobic microbes using the
included Premix Starter Kit and Compost Accelerator (microbes) and
periodically, a small amount of garden peat moss. Optionally, you may
add additional natural aerobic microbes to provide maximum performance.
Some composting toilets are basically hollow shells. These are truly
composting toilet systems.
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Cleaning
is minimal, and in fact, less than most flush toilets. Powered units
have a switch to control the fans and/or the heating system, and you can
introduce the organic products either through the Toilet or through the
service port on the Remote System. Standard
installation of the Remote treatment module requires a minimum clearance
of 33", from the ground to the bottom of the floor. A 30"
space is sufficient if the bathroom Toilet is slightly raised. The
Toilet can be installed on an upper floor some distance away from the
treatment center, using our included Flex Duct for both drain and vent. Available in choice of Non-Electric, 12VDC
Battery (Solar optional) and 120VAC Electric. |
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Size
All Remote Systems: 25" Width x 33" Length/Depth x
28.5" Height
Size
Waterless Toilet: 16.5" Width x 22.5" Length/Depth x
20.5" Height (Height to toilet seat 15")
Drains:
All Non-Electric and 12VDC Battery Systems are fitted with special
Filter Drain that must gravity feed to a proper drain site. A drain is a
recommended accessory for 120VAC models that will experience heavy use
or power outages.
Venting:
It is recommended to keep your vent completely vertical (i.e., straight
up).
Warranty:
Lifetime on the body and 5-Years on all internal components. |
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