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ES System Process

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Detailed System Process

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Detailed ES System Process

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Wastewater 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 test.)

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 wastewater.

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 a local audible of visual alarm for detecting high water level and air compressor malfunction. It is also offered with an optional custom computer control and telemetry system. The computer is capable of detecting failures of electrical and mechanical components critical to the treatment processes and delivering signals remotely via a modem connection.
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