Municipal Waste Water Trial

 

There are two WWS serving the City of Oberegon, Sonora, with a population of 500,000. These are designed with three lagoons…Aerobic-Facultative-Sedimentary System, and each plant has three identical trains. Operating for 12 years, they have been working within their guide-lines, and are well managed facilities with on-site laboratories.Recently the regulations for COD were lowered, and they are now being fined for non-compliance.  Each system dredges the excess sludge periodically, and has been story the residue on site.  It would be fine for top soil at this point,but the City has not utilized the resource, therefore it is becoming a storage problem.

The Plant Manager of Laqua, the firm under contract, is will to run a trial on one train in the Southern Plant.  We may select a recently dredged one, or one with sludge.  Considering the primary goal is to reduce the COD, it may be better to choose the recently dredged train, prove the efficacy, and then show the sludge benefit when we go into full treatment.  As such, the treatment  plan would be as follows:

 

Data                           Volume        Retention      First Week       2-3-4                After

Aerobic Lagoon       21,645 m3          1 Day         10/ daily        3 / daily          1 / 2 days

Facultative                 6,300 m3       0.3Day          4 / daily        1/ daily            1 / 2 days

Settling                    11,050 m3       0.5 Day          5 / daily        2/ daily            1 / 2 days

 

This would be 185 Gallons for the first month, and 9 Gallons per week thereafter. The goal will be to get the COD from the 230 to 250 range to below200…with a target of 150.  The sludge reduction benefits will be monitored as well. They are ready to proceed, once a confidentiality agreement is signed.  We will want the right to use the data in a general sense, but will protect their confident requests.