ES System Process
Technical System Overview
Detailed System Process
Effluent Comparison Report
or on the image, to view ES System process demonstration.
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Influent from the house is gravity fed into the first compartment (Primary
Clarifier). In the first chamber, settling of the sludge and solids occurs. The
primary clarified wastewater overflows into the second compartment (First
Aeration Compartment). In the second compartment the wastewater is aerated using
a high-efficiency low-pressure air compressor and a membrane air diffuser
assembly. The diffuser assembly is custom designed to ensure maximum oxygen
transfer and optimum mixing of dissolved substrates and oxygen. Furthermore, the
mixing ensures that the solids remain suspended within the reactor and that the
biomedia does not clog. The aeration promotes growth of aerobic microorganisms,
which convert and remove biodegradable organic matter. (The organics removed by
the aerobic process are the constituents that are measured in the CBOD5
The treated wastewater, which is now low in carbon but high in ammonia,
overflows into the third compartment (Second Aeration Compartment). This chamber
is aerated in the same way as the First Aerated Compartment. The oxygen rich
atmosphere in this chamber promotes the growth of nitrifying microorganisms (Nitrosomonas
and Nitrobacter), since it is low in carbon and high in ammonia. The nitrifying
microorganisms convert ammonia to nitrates utilizing the oxygen in the
To optimize the contact time and the mean cell residence time, the EnviroServer
utilizes a biomedia in the aerated sections. This plastic media is used to
supply a support structure for the establishment of a resident biofilm and is
specifically developed for optimized biological growth without clogging. The
main advantage is that the biomass is attached to the biomedia and will not get
flushed out at high input flow rates. This will favor the nitrification process,
which is significantly slower than the organic removal. The biomedia also work
as an agitator, which together with the air flow creates optimum mixing of
bacteria and wastewater.
The two-stage aerobically treated wastewater, which is now high in nitrates but
low in carbon (low in CBOD5) underflows into the fourth compartment
(Secondary Clarifier), where final clarification and settling of the suspended
solids take place.
To promote denitrification, and to remove the accumulated biomass, the
wastewater is recirculated by a reirculation pump from the fourth compartment
back to the first anaerobic compartment (Primary Clarifier). The recirculation
pump is operated by an air-lift action, and does not have any moving parts. A
volume equal to eight percent of the systems rated capacity is recirculated each
hour. Denitrification is facilitated by this recirculation because the bacteria
in the first anaerobic compartment use the oxygen from the nitrate molecule in
their metabolic process, with nitrogen being released as gas in the reaction.
Without recirculation, the small amount of carbon available in the fourth
compartment would limit the denitrification. The EnviroServer ES Model provides
increased residence time in the Primary Clarifier for improved denitrification,
which may be important in colder climates.
Furthermore, the recirculation of the biomass prevents accumulation of the
biomass in the final Clarifier, eliminating the need for periodic removal.
Removing the accumulated biomass also helps to ensure optimum clarifier
performance resulting in an effluent with low suspended solids. The transfer of
the biomass to the first compartment ensures a large vital population of
microorganisms for the organic and nitrogen removal processes.
The recirculation process also benefits the system in times of low loading such
as vacation periods. When the water is recirculated, it carries nutrients from
the first compartment into the second compartment. Thus the available nutrients
are utilized to sustain the population as long as possible. In normal operation
this keeps sludge build up to a minimum by helping to break up and dissolve the
solids, making the nutrients available for the microorganisms.
The clarified water leaves the treatment system through an effluent filter into
the final Effluent Storage compartment. The effluent filter protects the
effluent storage and finally the dispersal field from solids carry-over during
upset conditions. It is designed to remove all particles larger than 1/16�. The
effluent is now ready for surface or sub-surface discharge.
The Primary Clarifier is sized to hold sludge for one to three years depending
on the usage of the system, i.e. needs to be pumped every one to three years.
The first baffle is enforced to be able to withstand the hydraulic pressure of
the first compartment being empty and the second full.
The EnviroServer System is equipped with an alarm & control panel. The panel has
local audible and visual alarms for detecting high water level, air compressor
malfunction, and other failures of electrical and mechanical components critical
to the treatment processes. In addition, it can control the effluent pump and
one set of solenoid valves for an automatic back-flush system, if applicable.
The panel is offered with an optional custom telemetry board. The telemetry is
capable of delivering alarm signals remotely via a phone connection to the
MicroSepTec Monitoring Center. The Monitoring Center will automatically notify
the assigned Service Technician about the malfunction.