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OxyMem Blog

14-Jul-2017 15:02:17

Increase Treatment Capacity, Increase Revenue

The wastewater treatment facility is viewed only as the back end of industrial plants. To most, it holds no value.

If an investor was to assess an industrial business for its current and potential future worth, he or she would simply note the fact that an asset or structure exists on site for treating a process by-product (wastewater). Few spot the opportunity that exists in this underutilized asset.

 

22-Mar-2017 15:17:38

Biofilm...Beathe Deep with MABR

The Membrane Aerated Bioflm Reactor consists of two main components the membrane and the Biofilm.  The Biofilm which is a consortia of micro-organisims growing attached to each other and in most cases also to a surface, is what actually breaks down the pollutants in the wastewater. Biofilm or Fixed Film technologies have been around for over 100 years. With trickling filters one of the oldest wastewater treatment technologies in existence. Up until recently all biofilm systems whether submerged or non-submerged have been co-diffusional biofilms. This means that all the nutrients and oxygen diffuse into the biofilm together from the exposed surface. The material on which the biofilm is attached is inert and does nothing apart from provide the surface upon which the biofilm grows, which means there is no need for recovery of the biomass as its always in the reactor.  These co-diffusion biofilms have limited reaction rates due to diffusional limitation within the biofilm.

11-Jan-2017 18:24:09

Let's cut the crap - time to get serious about wastewater treatment

According to the fourth World Water Development Report, only 20% of global wastewater is treated (UNESCO, 2012). The vast majority of wastewater is discharged directly into the environment without any form of treatment.  Worldwide wastewater treatment is clearly inadequate and failing both society and the environment.

Urban populations are projected to nearly double in the next 40 years, from 3.4 billion to over 6 billion people - but already most cities fail to provide adequate wastewater management due to absent, inadequate or aging sewage infrastructure (World Water Council, 2012).

According to a recent UN-Water Analytical Brief, a paradigm shift is urgently required in water politics the world over to prevent further damage to sensitive ecosystems, and to the aquatic environment.

19-Dec-2016 10:40:54

Bubble-less MABR system can reduce energy costs for wastewater aeration

The secondary or biological stage of traditional activated sludge wastewater treatment plants is where most of the energy is consumed. It far outweighs the operational costs of pumps, mixers, chemical addition, lighting, heating, etc.

Oxygen needed by bacteria used in this stage is usually delivered in the form of atmospheric air, through mechanical equipment, and usually against a hydrostatic pressure created by four to six metres of water depth. Rotating blade mixers, jets and/or large blowers are needed to push air through this pressure (head), to ensure all bacteria receive sufficient oxygen.

08-Nov-2016 13:00:00

Design Your Own MABR

Have you always wanted an MABR for your Wastewater Treatment Plant but feel overwhelmed by where to start?

  • What do you need?
  • What will it look like?
  • How much membrane is required?
  • How much air is required?

Well let's start at the beginning, and like other aeration technologies the first thing that must be calculated is how much oxygen is required for the biological treatment process? Pollution in wastewater is either particulate (solids) or dissolved. While biological processes can treat both, for ease of calculation, and because biological processes take a lot longer to break down solid components than settling or filtration, we will only consider the dissolved components in this calculation.

Oxygen will be required for the breakdown of Carbon Oxygen Demand (COD)  and Ammonia:

  • 1kg of O2 for every kg of COD
  • 4.6kg of O2 for every kg of Ammonia as N (N-NH3)