Operation of Wastewater Treatment Works

Taxonomy

• Effluent
• Reclaimed Wastewater
• Sludge Separation
• Industrial Wastewater Treatment
• Sludge Treatment
• Sludge Management
• Wastewater Treatment
• Wastewater Collection
• Effluent Water
• Sludge Treatment & Management

7 Answers

1. It is practically not possible. In biological treatment Part of BOD removed is converted to biomass. The accumulated biomass is to be removed to keep the F/M ration in activated sludge process.

2. By Using ASP-Con - Activated Sludge Plant Controllers - Self-Cleaning/Self-Calibrating instruments measuring the key requirement the Biological Treatment Plants should be using to control their plant - OUR - Oxygen Uptake Rate of the load coming into a plant - the ability to communicate with the blowers, in turn having the ability of controlling the rate of aeration.  Using Feed-Forward/Feedback Control which reduces aeration by up to 50%, keeps the bacteria happy and optimally working, this also ensures 24/7 compliance along with the ability to control hydraulic throughput, in some instances increasing the plants HRT by 50%.  For more information please contact me and check out www.strathkelvin.com/asp-con.

3. I think by using Advance Oxidation Process (AOPs) we can treat the water without generation of sludge but the main drawback is it is a costly method. Research work is going on how to make it feasible and cheap so that we can use this Advance Oxidation Process. It is used in some countries 

4. I would agree that with any process you use you will need to get rid of excess solids. Even with endogenous respiration you will still have solids, if we didn't we would never need solids digestion or disposal. 

5. I must not be understanding the question either. The solids we're removing from the wastewater needs to be removed from the process or it will eventually accumulate and exit with the effluent.

   I agree with Ademar. Extended aeration and ditches also produce waste sludge (excess bugs) that need to be removed to maintain an acceptable MLSS and not overload the clarifiers. 

   Anaerobic treatment will reduce the amount of solids, but there will still be solids left to remove as well. 

   3 Comments

   1. Hello Phetla, thanks for clarifying. If you are just doing screen removal, no you won't have good effluent from wastewater. The screening will only remove some of the larger trash, and very little of the human waste, which contains the vast majority of the pathogens that cause illness. The next step after screening would be to separate what we call suspended solids, which will either settle or float (will need bottom and surface removal of sludge and scum from the water). That will be an improvement and requires a tank with large enough volume to slow down the incoming flow velocity. There are many ways of removing the floatables and settleables. Some have high cost and require less manpower, or you can have very simple and cheap solutions that require more ongoing manpower. This will improve your effluent quality significantly, but does not remove anything that is dissolved. So if you end sedimentation tanks and then downstream disinfection, you will vastly improve the effluent quality (compared to just screening). 

   2. No disludging, you must that into consideration, after screen removal water flow to the final effluent.

   3. Right Thomas. Both processes produce excess sludge.

      In my poor understanding of the very vague question 'no desludging' meant 'less/minimum desludging'.

      Otherwise You are absolutely right, there will always be sludge excess to dispose.

      Regards.

      Tiziano 

6. It is impossible im my opinion if I understand your question. You can have more or less excess sludge according to the process you use. Please formulate your question with more information.

   1 Comment

   1. Question is clear, can be possible to operate a treatment process without desludging? 

      1 Comment reply

      1. Dear Phetla, zero desludging is not recommended as deliberated operation procedure and, as told before by esteemed colleagues, You would always have some excess solid generation.
         BUT
         I'm back from BD  site now because Client had Dewatering line out of service for two years now (ETP for textile): not a good situation after all, but ETP was still meeting limits at discharge and MLSS were still under control, even prior of filterpress rerun.
          

7. Of course You can. Extended aeration and ditch are examples of aerobic biological plants conceived for that purpose.

   Also anaerobic treatment produce almost no sludge and well stable. Combination of two ( ana+aer) is probably what You are looking for.

   1 Comment

   1. Although you are not desludging, you can have good effluent?