Extended Aeration (EA) Wastewater Treatment Plants
The Corix Water Systems' Extended Aeration (EA) wastewater treatment plants are based on time-proven, conservative process designs, carefully engineered to optimize their performance. EA wastewater treatment plants are one of the most basic sewage treatment technologies and probably one of the most versatile methods available. EA treatment plants are suitable for most wastewater and are economical to install and operate.
How EA wastewater treatment plants work
An EA plant consists of two major compartments, the main aeration chamber and a clarifier or settling tank. After initial screening, the wastewater enters the main aeration tank which has a retention time of approximately 24 hours. Here, natural bacteria feed on the organic fraction of the sewage and reduce BOD concentrations. The partially treated sewage then flows to the final settling tank for clarification, prior to discharge. The effluent could then be filtered and/or disinfected, depending on the requirements of the ultimate disposal.
Advantages and key features
- simple, low-cost design
- minimal sludge production, due to extended aeration times
- constructed in either marine grade aluminum or epoxy-coated steel for long corrosion-free service
- air operated pumps mean fewer electrical components
- flexible process that can treat a wide range of wastewaters
Sizing and selection information
All of our packaged wastewater treatment plants are custom designed to suit our customer's specific requirements. The important sizing criteria include:
- average daily flow
- strength of the incoming wastewater, (BOD5, TSS, ammonia and phosphorus)
- Source of the wastewater, ie., residential subdivision, campground or RV park, commercial development or industrial development
- flow variations during the day
- effluent quality required (BOD5 and TSS) as set by the local health department or environmental department
- requirement for disinfection and preferred technology (chlorination, UV or ozone)
- additional requirements would include items such as effluent pumps, flow meters, inlet bar screens or comminutors
