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How it works....
The Treatment Process
Influent Bar Screen Mechanism |
The wastewwater enters the Influent Pumping Station where it is first screened of rocks, wood, and other debris that enters the wastewater stream. The wastewater is then conveyed to the Primary Clarifiers via the Influent Pumps.
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Primary Clarifier |
The wastewater slowly flows through the Primary Sedimentation tanks where settling and skimming processes remove solids, grease and scum.
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The trickling filter dosing pumps convey primary effluent from the primary clarifiers to the Trickling Filters where it is distributed onto the filter media. The trickling filters provide biological treatment of primary effluent. |
Trickling filter |
Solids Contact Basin |
The trickling filter effluent flows into the Solids Contact and Areation System where blowers provide oxygen and mixing for the microorganisms. |
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The Secondary Clarifiers receive solids contact mixed liquor and are intended to separate the soilds, scum, and any remaining settlable or floatable solids from the treated wastewater to produce a clear effluent. |
Secondary clarifier |
Chlorine Contact Basins |
The secondary clarifier effluent then flows into the Chlorine Contact Basin where Sodium Hypochlorite solution (think of strong chlorine bleach) is applied to the treated effluent. The effluent travels through the chlorine contact tanks to effectively kill nearly all the remaining bacteria and other pathogens. |
The disinfected effluent is pumped to a series of Effluent Storage Ponds for storage. The pond effluent is then used for irrigation on the surrounding agricultural land, providing beneficial reuse of the effluent. |
Effluent Storage Ponds |
Digester Building |
Two Anaerobic Digesters, with a total capacity of 518,000 gallons, continously store and treat the sewage sludge. Methane gas is produced in the digesters and then recovered and used to fuel boilers, maintain optimum digester operating temperature and for cogeneration to heat the treatment plant facilities during the winter months, thus saving tremendous amounts of natural gas usage. The treated sludge is then drawn from the digesters daily and dried on a filter press producing 10 -12 cubic yards of bio-solids which in turn, is also used for beneficial reuse purposes. As the sludge volumes are expected to double in the coming years, a third anaerobic digester is being designed and scheduled for construction in 2008 to address the continual increase of sludge production as the community grows. |
MGSD utilizes a "state of the art" Odor Control System which effectively controls any odors which may be emitted from the plant facilities. |
Odor Control System |
