Municipal Wastewater Treatment
Wastewater Treatment Facility
The City of Escalon
The City of Escalon CA was experiencing difficulty in maintaining dissolved oxygen levels in their industrial ponds.
During the processing season, they were receiving 3MGD of industrial wastewater from tomato and green pepper processors. During the previous season, they had been out of compliance on numerous occasions and received several complaints from the public concerning odor from the ponds.
IE proposed a system of mixing pure oxygen into their influent ponds at a depth of six feet. This would ensure sufficient DO levels were maintained and allow reducing the number of aerators in operation. With fewer aerators running odor problems and electric utility charges would be reduced.
The system consisted of a 13,000 Gal. Liquid Oxygen Tank and Vaporizer, four 15HP Maximum Oxygen Flow Outlets (MOFO), an Oxygen Control Module for each unit, and the necessary main control panel, concrete pads, piping and electrical.
Santa Fe WWTP, Tijuana, BC, Mexico
This municipal WWTP designed for a flow of 0.6 MGD was designed and built jointly by Integrated Engineers, Inc. and Laval Tijuana S.A. de C.V. and installed by Laval in the summer/fall of 2002 for $1.6M USD. The facility uses a prescreening process, grit removal, flow measurement, oxidation ditch with aspirating aerators, secondary clarifier, chlorine dioxide for disinfecting before final discharge. Solids are aerobically digested in the aerobic digester and then dewatered across the rotary screen. The source of the wastewater is from 1,000 houses located uphill from the facility.
The client, URBI, is a land developing company that builds houses in areas of North and Central America (22 houses/hour) and has taken a lead in environmental responsibility by utilizing newer technologies for treatment and water reuse. This facility will reuse its water for compaction of the soil during construction of Phase 2 as well as watering the green area and an elementary school.
The system was designed to meet a 15 ppm BOD/15 ppm TSS and be fully disinfected at the effluent, which far exceeds the local discharge requirements. The cost justification for the project was based on the fact that fresh water in Tijuana is $2.00 USD /cubic meter. With the help from Laval, they will now use the water from this facility for compaction and watering the green areas saving an estimated $2-3M over the next 3 years.
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