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One Tank, Five Chambers, Total Treatment

The EnviroServer® ES is a pre-engineered system that can best be described as a hybrid fixed film-suspended growth extended aeration wastewater treatment system with an adjustable two-stage biological process to optimize denitrification. A single five-compartment fiberglass tank incorporates a primary settling/septic chamber, two aerobic chambers, a final settling chamber and an effluent chamber to house optional disinfection units and/or effluent pumps.

The single-tank design means one excavation so it can be installed in small or sloped lots. While heavy duty, the tank is light enough to be transported and easily maneuvered with typical installation equipment. The system is based on simple “plug and play” concepts with few moving parts, allowing quick installation and maintenance and enhancing profitability. For ease of maintenance, components are accessible at grade. The tank leaves a very small footprint, which can be easily concealed, and highly efficient fine air membrane diffusers allow the system to use very quiet, low-flow compressors. MicroSepTec offers three residential sizes: ES6 (600 gpd), ES12 (1,200 gpd) and ES25 (2,500 gpd).


Why the EnviroServer?

One Tank, Five Compartments, Total Treatment:  No other system can accomplish primary and secondary treatment, denitrification, UV disinfection and pressurized effluent dispersal in a single tank

Environmentally friendly:  The three 24" round riser lids can easily be hidden in the landscape, with the compressor and controller mounted remotely.  The low-flow compressor is very quiet and a healthy system emits no noticeable odor.

Simple to design: The pre-engineered system comes in three sizes: 600, 1,200 or 2,500 GPD and attains the highest treatment levels.  The designer simply selects the size and options (effluent pump, disinfection, telemetry) needed for the project.

Easy to install:  The EnviroServer ES is self-contained in one fiberglass tank, requiring a single excavation.  Using plug-n-play concepts, the connections and internal component assembly can be completed in a couple of hours.

Minimal maintenance:  Because there is no filter media, small orifices or submersed pumps to maintain, periodic maintenance can be completed very quickly.  The compressor (one or two) is the only moving part and all components are easily accessible at grade.


Process Animation


Process Description

Stage 1 – Primary Clarification

The figure above shows a process flow diagram of the EnviroServer ES Model.  Wastewater influent from the house is gravity fed into the first compartment  (Primary Clarifier) of the system.  In the first compartment, settling of the sludge and solids occurs.  The primary clarified wastewater overflows into the second compartment of the system (First Aeration Chamber) through sanitary tees. 

Stage 2 – Biological Organic Removal

In the second compartment, the wastewater is aerated using a high-efficiency low-pressure air compressor and a fine-bubble 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 the solids remain suspended within the reactor and that the biomedia does not clog.  The aeration promotes the 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 test.)  

To optimize the contact time and the mean cell residence time, the EnviroServer utilizes a biomedia in the aerobic 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 design allows the biomass to attach to the biomedia and not flush out during high flow rates.  The biomedia also enhances the nitrification process, which requires a larger population of organisms due to the lower metabolic rate of the nitrifying bacteria.

Stage 3 – Biological Ammonia Conversion (Nitrification)

The partially treated wastewater, now low in carbon but high in ammonia, flows into the third compartment (Second Aeration Chamber) of the system and is aerated in the same manner as the second compartment.  The combination of low carbon content, high ammonia, and high oxygen levels in this chamber promotes the growth of nitrifying microorganisms (Nitrosomonas and Nitrobacter).  The nitrifying microorganisms convert ammonia to nitrates utilizing the oxygen in the wastewater.

Stage 4 – Clarification

The two-stage aerobically treated wastewater, which is now high in nitrates but low in carbon (BOD), flows into the fourth compartment (Final Clarifier) of the system where clarification and settling of suspended solids occurs.

Stage 5 – Nitrate Removal

To promote denitrification, the wastewater is recirculated from the final clarifier back to the primary clarifier, which contains sufficient carbon to promote denitrification.  Denitrification occurs because the bacteria in the primary (anoxic) clarifier use the oxygen from the nitrate molecules in their metabolic process; the nitrogen left over from this reaction is then released as a gas. 

Stage 6 – Solids Removal

The recirculation also helps prevent accumulation of biomass in the final clarifier, decreasing the need for periodic removal.  Removing the accumulated biomass helps ensure optimum clarifier performance, resulting in an effluent with low suspended solids.  The transfer of the biomass to the primary clarifier ensures a large vital population of microorganisms for the organic and nitrogen removal processes in the aeration compartments.  When the water is recirculated, it carries nutrients from the primary clarifier into the aeration compartments.  Thus, the available nutrients are utilized to sustain the population as long as possible, particularly in times of low loading such as vacation periods.  In normal operation, this keeps sludge build-up to a minimum by helping break up and dissolve the solids, thereby making the nutrients available for the microorganisms.

Because of the recirculation, the sludge is accumulated and stored in the primary clarifier.  The primary clarifier is sized to hold sludge for one to three years, depending on the usage of the system, and will need to be pumped as needed.  The first baffle is reinforced to be able to withstand the hydraulic pressure of the first compartment being empty and the second full. 

Stage 7 - Effluent Filtration and Disinfection (optional)

The clarified water leaves the treatment compartments through an effluent filter into the final storage compartment (Effluent Chamber).  The effluent filter protects the effluent chamber and subsequent dispersal field from solids carry-over during upset conditions.  It is designed to remove all particles larger than 1/16”.

A UV-disinfection unit is offered as an option to eliminate remaining pathogens, including fecal coliform.  When selected, the clarified water passes through a disinfection unit after it leaves the effluent filter.  The effluent is now ready for subsurface discharge. 

Alarm and Control Panel

The EnviroServer ES System is equipped with a local audible and visual alarm for detecting high water level, air compressor failure, and optional UV disinfection failure. The panel is also capable of time dosing an effluent pump. 

Telemetry (optional)

The EnviroServer System is offered with an optional telemetry panel, which will send the alarms via a modem connection to the MicroSepTec eConnect Server.  The eConnect Server will automatically notify the assigned Service Provider about the malfunction.

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About Us

The company was formed in 2003 as an independent distributor of the MicroSepTec product line and other related products. Over the next 10 years, we grew with our specifiers, installers and service providers in California, Arizona and Nevada. Recognizing that we were only serving a portion of our customers’ needs, the company rebranded as GTS in 2013 and expanded to provide an even broader range of systems and components to the water treatment industry read more ...

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