• Poipu Water Reclamation Facility

    Poipu Water Reclamation Facility
    The original wastewater facility was constructed in 1981 to serve the Poipu resort area and designed to handle 500,000 gallons of wastewater per day. The effluent is used to irrigate the Kiahuna Golf Course. In 2004, the treatment capacity was increased to 1.0 mgd to accommodate the increased development in the area. Aqua Engineers, Inc. replaced the conventional activated sludge process with the Kaldnes Moving Bed Bio-reactor (MBBR) fixed film process. Cloth disk filters and ultraviolet disinfection were installed to upgrade the process to produce R-1 effluent. Briant Construction, Inc. installed new welded stainless steel tanks and equipment for the MBBR process. The tanks were constructed using a new construction method from Italy to reduce costs by 30 percent. Aqua Engineers, Inc. continues to operate the facility, which has become more efficient as a result of the upgrade.
  • Schofield Barracks Wastewater Treatment Plant Digester Rehabilitation



    In 2011, Aqua Engineers was awarded this $3 million contract by the US Army Garrison Hawai‘i DPW.  The goal was to provide ongoing equipment repair and replacement at the Schofield Barracks Wastewater Treatment Plant Digester in order to increase its efficiency and minimize its environmental impact. 
    The project also includes researching potential additive alternative waste to energy projects. These alternative energy projects include cogeneration using Combined Heat and Power System technology and a F.O.G. (fats, oils, and grease) receiving station.  
    In addition to job creation, this project will result in alternative energy sources.  The cogeneration system uses waste gas to produce electricity, which will reduce emissions associated with fuel oil, and cut back on electrical consumption.
    The second alternative energy project—F.O.G.—will retain oils, greases, and fats from the digester and use them to create methane gas production that can be used to make additional electricity.  
  • Waimea Wasterwater Plant Expansion

    In November 2009, the County of Kaua‘i selected Aqua Engineers to upgrade and expand the County’s Waimea WWTP.  The upgraded Waimea Plant uses state of the art filtration systems and clean energy technology such as a photovoltaic system for optimal service and cost efficiencies.  The plant’s treatment capacity will more than double, to 700,000 gallons per day from 300,000 gallons per day.  
    The U.S. Environmental Protection Agency (EPA) recognized the Waimea Wastewater Treatment Plant (WWTP) expansion project with the 2010 PISCES award (Performance and Innovation in SRFs Creating Environmental Success).  The award recognizes successfully designed projects that further the goal of clean and safe water with exceptional planning, management, and financing. DOH officials noted that the Waimea project was exceptionally green, citing its water and energy efficiency and sustainability practices.
    The expanded and upgraded plant produces a high quality treated wastewater effluent (R-1), which will be a valuable resource for Kaua’i’s master planned and growing Westside community.  The water will be used for diversified agriculture, parks, school fields and a future golf course.  This benefit will reduce the county’s reliance on potable water sources for irrigation.  The project also has created jobs for local contractors, bringing significant long-term employment opportunities to Kaua‘i. 

  • Schofield Barracks Wastewater Treatment Plant Upgrade

    In 2006, Aqua purchased this plant and made it the largest, privately owned R-1 facility in Hawai‘i.   The wastewater treatment plant upgrade enabled the plant to provide premium recycled water—known as R-1 quality—to irrigate lawns, golf courses, parks and other sites on the base and nearby.
    The project positively affects the nearly 28,000 military personnel and their families and civilians who work on base and in the surrounding area.  To handle the project, Aqua Engineers created 16 new jobs for the local work force and hired subcontractors, and obtained financing from CoBank and Bank of Hawaii. 
    U.S. Army Garrison, Hawaii, has credited the upgrades for enabling the military to conserve water, decrease pollution, and contribute to sustainability goals.  Aqua Engineers recommended the new MBR (Membrane Biological Reactor) technology, which has reduced the plant’s output of nitrogen and phosphates, turning the former liability into an asset. This plant is a model in the islands and for the military. 
  • Schofield

    Aqua Engineers was awarded the Privatization of the Wastewater Treatment Plant and Distribution System at Schofield Barracks, on the island of Oahu, Hawaii. The contract involves operation and ownership of the Schofield Barracks WWTP, 17 WWPSs, approximately 70 miles of gravity sewers, and numerous grease traps and oil/water separators. The Schofield Barracks WWTP has a current design capacity of 4.2 mgd. The scope of work of our contract includes upgrading the existing secondary R-2 treatment plant to R-1 standards and installing a SCADA system within the first 2 years of the contract. Additional projects scheduled for the first 2 years include pump station upgrades, oil/water separator and grease trap upgrades, and development of a comprehensive collection system maintenance and repair/rehabilitation project prioritization program.
  • Grove Farm Surface Water Purification Facility

    Grove Farm Surface Water Treatment Plant
    Aqua Engineers was sub-contracted by Grove Farm Company to design, build, operate and maintain the first surface water treatment plant on Kauai. The facility utilizes the ultra-filtration membrane process. Raw water from the Kapaia Reservoir is treated by pulling it through the porous walls of the hollow fibers by a partial vacuum applied within the membrane. The initial rated capacity of the plant is based on a firm rate of 3.0 million gallons per day, and a maximum production rate of 4.0 mgd. The filtered surface water services the towns of Lihue, Puhi, and Hanamaulu.