Dissolved oxygen (DO) is defined in biological treatment as the relative measure of oxygen dissolved in wastewater available to sustain life, including living bacteria. The concentration of dissolved oxygen (DO) in the aeration tank(s) of an activated sludge system is one of the most important process control parameters.


Indicators of low dissolved-oxygen conditions include:

  • substantial presence of low dissolved-oxygen filamentous bacteria in the activated sludge,
  • turbid effluent,
  • Dark gray or black-colored mixed liquor (often with a putrid odor).
Typical DO Level required at all water Tanks >2.0mg/L
Comfort DO level with minimal dead zones >=5.0mg/L




  1. Use of Chemical INPUTS

OXY-SUPER: Provides sufficient dissolved oxygen; Adjust the pH; Reduces the subaqueous content of ammonium and nitrogen; Eliminates carbon dioxide and sulfureted hydrogen; Prevent anaerobe from proliferation and killing nosogenetic bacteria , Typical Dose: 5 grams/ KL/ week

  1. Increasing blower efficiency
  • Dirty Air Filters :Replace or clean air filters
  • Check for Inlet Air Flow restrictions : Can be caused by a closed valve
  • Operate atleast 2 blowers on 24X 7 basis
  1. Diffuser Cleaning:Diffusers are subject to fouling and deterioration and need to be cleaned on a regular basis
  1. Aeration in grease traps : Aerating the grease trap creates a mini-waste water treatment plant environment. Aeration increases oxygen and ubiquitous aerobic bacterial populations, and softens and greatly reduces the grease cap, thus completely eliminating odor and clarifying the water. 
  1. AIRBLOWER INPUT BARSCREEN CHAMBER/ COLLECTION TANK: Aerating the bar screen chamber will start Oxygen diffusion from this tank and will help increase DO levels and control odors.
  1. INCREASING H.R.T. in AERATION TANK: At times when BOD Load is high increasing the Hydraulic retention time of wastewater in the FAB tank will increase DO Levels and Stop nitrification bubbles in the clarifier. 
  1. Visual Inspection of Aeration Tanks :Good airflow not only ensures good dissolved-oxygen concentration, but also good mixing. Reactors should be checked periodically to ensure that all portions of the reactor are being adequately mixed and that there are no dead spots that can produce anaerobic conditions. A procedure to do this is to take mixed-liquor grab samples at different locations and depths in the biological reactors and check for consistent suspended solids levels.

We hope you will find these steps useful and easy to incorporate in your plant, for any further details  or queries, we remain to serve you.

write to us at  for a speedy solution to your wastewater trouble.


Bio Cleaning of Drain Lines

No matter how careful and trained kitchen staff is , invariably a large portion of fats and oils find their way down the drain lines and grease traps.These fats and oils reduce the internal diameter of drain lines and cause blockages and odors, the grease also solidifies to cause grease trap overflows and blocked and polluted sewer systems.

Increased repair costs, seepage issues, pests and flies, bad community relations , foul odors the list only increases.


Detergents and Hot Water Don’t Work


Detergents displace Fats and oils a but don’t degrade them and hot water lifts the sticky fats further down the drain to make problems even worse.Bleaches, Caustic and acid are really harmful and cause irrepairable damage like corrosion to pipelines and upsetting the wastewater treatment systems.

Bio-Degradation Works!

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Bio treatment of food waste is done by dosing a blend of oil and fat eating microbes and fat digesting enzymes in drain-lines. These microbes digest the sticky oils and fats deposits in drain-lines and bring back the reduced diameter of clogged pipelines back to normal ,allowing waste to pass through. such a dosing is done at a time when the drain experiences least flow, so that microbes get sufficient time to degrade food organics and multiply.In a matter of few days the microbes remove tough sticky deposits , colonize the drain and form a bio-film, this bio-film maintains free flowing drains.

Similar benefits can be achieved in grease traps and (STPs) Sewage Treatment systems, These microbes can act on sugars starches, proteins etc.. .They are very safe to use and are non pathogenic strains , i.e cannot cause disease. The microbial dosing done on drains only benefits the native bacterial population present in STPs and enhances their efficiency.

This is the way of the Future!

Biotreatment of food waste dispels the darkness caused by primitive technologies like manual scavenging, rodding, pressure jetting and is the way of the future.

if you enjoyed reading this post , i’d be grateful, if you’d help spread the word by emailing or sharing this article.Best regards ..Sanjay Bahl…+91 9818588486 or director(at)

The author runs an organization to help industries manage their waste issues by using bio-remediation