Aerobic Wastewater Treatment Overview

Highly effective and able to generate very high-quality effluents, aerobic biological wastewater treatment processes were once the solution applied to treat most types of industrial wastewater. Nowadays, with far greater emphasis on energy-efficiency and the minimization of residuals (i.e. waste sludge), they are mostly limited to diluted industrial wastewaters and municipal applications, and as a polishing step after anaerobic treatment.

Del Monte WWTP

However, when strict discharge requirements are present, it is still impossible to design a full biological treatment for any type of wastewater without applying at least one aerobic step. Therefore, our portfolio of technologies also includes a variety of different aerobic treatment systems. This way we are able to offer you a complete range of wastewater treatment solutions able to meet any discharge requirements.

In aerobic biological treatment processes, organic pollution is converted to carbon dioxide and water. The process requires active aerobic biomass and supplying a significant amount of oxygen to the reactor in order for the treatment to take place. The drawback is that supply of the oxygen needed, is often very energy-intensive, especially when dealing with concentrated industrial wastewaters. Another disadvantage is substantial excess sludge production that must be managed and ultimately disposed of.


ACTIVOX™ Conventional Activated Sludge System

ACTIVOX activated sludge

GWE's ACTIVOX™ conventional activated sludge system is applicable to most standard aerobic treatment scenarios. The basic package consists of an activated sludge step with final clarification and sludge recirculation line. The system is simple, robust, and reliable in operation.

Technology: secondary treatment, anaerobic effluent polishing.

FLOTOX™ Aerobic treatment with enhanced clarification step

FLOTOX aerobic treatment DAF

The FLOTOX™ system consists of an aeration basin and GWE’s SUPERFLOT™ - AIR dissolved air flotation unit for sludge separation. Organic pollutants (COD, BOD) and ammonia are removed in the aerobic treatment. Depending on the application, the aerobic chamber can be standard activated sludge or other technology, such as Moving Bed Bio Reactor.

In SUPERFLOT™ - AIR the wastewater/sludge is introduced, together with recycled clean effluent in which air is dissolved under high pressure. Floating sludge is removed by a surface scraper.

Technology: secondary treatment, anaerobic effluent polishing, ehnaced solids clarification.

ASTEROX™ Advanced Multi-Stage Activated Sludge System With Nitrogen & Phosphorous Removal


ASTEROX™ is a tailor-made and state-of-the-art activated sludge treatment process. Through the use of selectors (bulking sludge control) and a plug-flow design with denitrification options, the process is ideal for the treatment of relatively complicated wastewaters requiring some level of nitrogen and phosphorus removal to meet discharge limits.

Technology: secondary treatment, anaerobic effluent polishing, nitrification/denitrification, nutrient removal.

SEQUOX™ Conventional Sequential Batch Reactor (SBR)


SEQUOX™ is a flexible form of treatment technology ideal for small projects with variable wastewater composition and applications with irregular or seasonal wastewater production. Available as a single tank or multiple reactors, the operation of a sequential batch reactor allows for full treatment in one tank. It is operated in a repetitive sequence of filling, aerating, settling and draining. The SEQUOX™ - 2 system employs two tanks to allow for a continuous wastewater intake, to minimize or eliminate equalization requirements.

Technology: secondary treatment, nitrification/denitrification, flexible flow treatment.

CYCLOX™ Continuous Aerobic SBR


CYCLOX™ continuous batch reactor process treats wastewater in three or more activated sludge basins, of which one serves as a settling tank during a few hours of operation, thus eliminating the need for additional clarifiers. Every few hours another basin serves as the settling tank, and the flow directions between the basins are changed. It is an ideal solution for larger flow applications with variable wastewater composition or seasonal production.

Technology: secondary treatment, nitrification/denitrification, nutrient removal, highly flexible loads and flows.

MEMBROX™ Membrane Bioreactor (MBR) System


For the highest treatment efficiency with the possibility of wastewater recycling and reuse, GWE recommends MEMBROX™ technology. It is a compact, concentrated form of activated sludge treatment system that utilizes a membrane filtration stage in place of conventional gravity-separation clarification. Applicable to nearly all applications, including biological nutrient removal, our conservative approach to design allows for reliable performance and low operational costs.

Technology: secondary treatment, membrane bioreactor, MBR, tertiary treatment, recycling, nitrification/denitrification, nutrient removal, high-tech.

Let us design you a turnkey solution tailored to your business’s needs. Contact GWE today to know more about our wastewater treatment solutions!

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