Case Studies: Large Scale and Commercial Treatment Systems

Case Studies: Large Scale and Commercial Treatment Systems

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ATU solves challenges for small southern town

Problem / Septic systems in Section, Alabama, did not meet current requirements. The town needed a wastewater treatment system to process the domestic waste produced by 700 residents and its commercial entities. 

Solution / System designers recommended a 30,000 gpd ECOPOD system from Delta Treatment Systems that treats domestic waste at a strength of 300 mg/L for both BOD and TSS. The system disposes of wastewater quietly, efficiently, with no odor, and has no inner tank filters, screens or diffusers to service. The sectioned system design handles an average daily flow fluctuation of 50 to 100%. The units were completed and shipped directly to the site ready for installation, including all required component equipment. A 14,200-gallon flow equalization tank was installed prior to the treatment reactor tanks to store the wastewater and evenly dose it to the treatment system throughout a 24-hour period. The flow equalization tank includes duplex pumps to ensure flow surges don’t reduce the efficiency of the treatment system. A 19,190-gallon primary tank is before the flow equalization tank. The effluent also passes through a UV system for disinfection of fecal coliform to concentrations below permit levels. A drip disposal system includes an effluent pump chamber, headworks, tubing, controls, and all necessary valves and fittings. A concrete building houses electrical controls and equipment.  

Result / The system is operating as designed and requires minimal operation and periodic professional maintenance. 800-219-9183;

Treatment units help historic lodge meet nitrogen limits

Problem / The iconic Surf Lodge, located at the easternmost tip of Long Island in the heart of Montauk, New York, needed a new onsite wastewater system. Situated directly on Fort Pond, the town and the county had enough of the antiquated system leaking sewage directly into the waterway. Not only did the sanitary system need to be upgraded, it needed to meet Suffolk County program requirements of 19 mg/L of TN for the wastewater effluent. 

Solution / Advanced Wastewater Solutions Long Island supplied the split system utilizing Fuji Clean USA CEN21 treatment units, designed to satisfy the TN reduction program. The first system consists of three CEN21 units being fed by a new precast distribution manhole concentrating solely on the hotel side of the property and its residential waste stream. The second system consists of four CEN21 units preceded by a new grease interceptor and primary treatment tanks, to treat the higher strength flows discharged from the restaurant, bar and outdoor venue.

Result / The units are producing results consistently within the county’s program limits of 19 mg/L of TN. With more consistent flows and loading last summer, results have been steadily closer to 10 mg/L of TN and are holding there. 207-406-2927;

Disinfection needs solved at oceanfront restaurant

Problem / The Duke’s Malibu restaurant is located on the oceanfront in Malibu, California. Wastewater from the restaurant averages 6,000 gpd and must be treated on site and directly discharged to the sensitive, sandy beach environment. An existing system was outdated and caused numerous water-quality and discharge violations. 

Solution / Carlile Macy was selected to provide an upgraded treatment system in 2011. It chose an upflow sludge blanket filtration system, or USBF, and SALCOR UV disinfection, consisting of four 3G units in two parallel tracks. The design was approved by the California Regional Water Quality Control Board and city of Malibu, and construction of the new plant was completed in April 2012. 

Result / The system immediately produced high-quality effluent, which met the stringent disinfection requirement of California Title 22. Results have been consistent since operation began. Effluent total coliform count has been nondetectable, and the dissolved oxygen concentration has averaged 6 mg/L. The discharge has reduced coliform levels in the groundwater lens under the site and adjacent beach from more than 1,600 MPN to less than 2 MPN. The UV units were initially inspected weekly for possible fouling of the Teflon barrier. Since no fouling has occurred, the inspections have been eliminated. 760-731-0745; 


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