The City of Durham, NC, completed a comprehensive wastewater master plan that evaluated different treatment techniques for meeting strict total nitrogen (TN) limits at the South Durham Water Reclamation Facility (SDWRF).
The AnoxKaldnes™ MBBR (Moving Bed Biofilm Reactor) process is a biological wastewater treatment process that utilizes specialized plastic carriers to create a surface on which a biofilm can attach.
When emergencies inevitably arise, municipal operators need to be prepared to respond immediately to restore services in order to provide safe, reliable water to their customers. Take for example the City of Cisco, Texas.
In 2002, Georgia’s City of Flowery Branch faced strict new requirements about discharging water back into nearby Lake Lanier, a community drinking water source, compelling the city to find an alternative wastewater system. After a thorough evaluation of various wastewater treatment solutions, Pall Corporation’s Aria FLEX membrane system was selected due to its critical ability to meet the phosphorus limits.
The City of Windsor in Ontario, Canada, owns and operates two wastewater treatment plants.
Petron Bataan Refinery wanted to expand production to process 180 thousand barrels of crude oil per day while changing its feedstock from Arab Light to less costly heavy and sour crudes.
Wastewater treatment facilities are subject to many different drivers for completing upgrades. Among the most prevalent drivers is a need to keep current with ever-changing, and increasingly stringent, environmental regulations. These regulations frequently require upgrading to tertiary treatment and the removal of BOD, TSS and Total Nitrogen.
A renowned pharmaceutical company in Pune, India, installed a water treatment system to recycle pharmaceutical process wastewater for reuse. Ultrafiltration was chosen as pretreatment to a reverse osmosis system, and the feed water was tertiary treated pharma effluent. Soon after operation began, the existing UF membranes were repeatedly choking, and QUA offered Q-SEP ultrafiltration modules to the customer to replace the existing UF membranes.
A natural gas-fired combined cycle power generation facility located in Idaho contacted QUA to find a solution to improve the performance of a water treatment system used to recycle the plant’s cooling tower blow down water.
The Gainesville Renewable Energy Center is a nominal 100 MW wood-fired biomass power generation facility located in Gainesville, FL. The plant provides about 30% of Gainesville Regional Utilities’ power, reducing the area’s dependence on energy from fossil fuels and greenhouse gas emissions. The client contacted QUA to install their Q-SEP® UF membranes as pretreatment for the plant’s water treatment system.
Sabine Pass, a large LNG refinery in the U.S., required a membrane desalination solution to cater to its extensive process water needs in order to produce a large amount of liquefied natural gas for export.
During operation, a remote mine site in Nevada experienced a pit flood as a direct result of groundwater recharge where approximately 40 million gallons of water flooded the open pit and brought mine operations to a halt.
Wastewater filtration is often part of the tertiary treatment process that involves the final removal of suspended particles from water that has passed through both the primary and secondary treatment phases and immediately precedes disinfection. As the water passes through the filter, residual suspended material and bacteria is trapped in the filter and are removed from the filtered water. Passage can be blocked by physical obstruction, biological action, adsorption, absorption or a combination of ways. Wastewater filtration is usually the final step in the solids removal process.
With regulations increasing around wastewater effluent, the use of ultrafiltration and microfiltration systems in further polishing effluent has grown. Sand or activated carbon filters can provide a media for bacterial decomposition of nutrients, converting nitrates into nitrogen gas. The rise of water reuse applications is also fueling the increasing use of filters during the final polishing stages of the wastewater treatment process.