Common Effluent Treatment Plant Design Process

Introduction :

Effluent treatment plants need land for construction, capital cost, power and specialized manpower for their operation and maintenance. Because of these constraints, small-scale tanneries can not afford to have their own effluent treatment facilities and therefore, combined effluent from all tanneries are to be brought to a centralized place for treatment. This facility is called a Common Effluent Treatment Plant (CETP). For operation and maintenance of CETP, small-scale tanners formed a co-operative society. The expenses for operation and maintenance of CETP are being shared by participating tanneries. Wastewater management for the cluster of small-scale tanneries was studied in details and various measures were incorporated to improve the performance of the CETP and also to improve treated effluent quality to confirm standard prescribed by regulatory agencies. Performance of existing CETP was evaluated. Based on the results, bench scale laboratory treatability studies were conducted for improvement in treated effluent quality and also to suggest appropriate modifications to the CETP. These studies are detailed in this paper. This is about Common Effluent Treatment Plant Design Process

There are a lot of questions that come up when you start to look at everything that goes on with your business. The fact of the matter is, there are a lot of our businesses that end up using a lot of water as part of what you’re doing. And because of that, you need to make sure that there is a way for you to get rid of any of the water that may not be good or that may not work too well, either.

When you start to look at industrial wastewater treatment, you will find that it’s likely much easier than you realized it would be to figure it out and see what works best for your investment. The fact of the matter is, there are a lot of problems that may come along in the meantime and you want to make sure that what you’re doing is actually going to make some sense for you and how you want to be able to get from point A to point B with everything that is going on with it. You want to get it cleared out without too much trouble. This is about Common Effluent Treatment Plant Design Process

Take some time to explore your options and to talk to people in your area about how they get rid of wastewater and other such things. Many times, you can learn a lot about what you want to do next and you can be certain that you’ve got pretty much anything and everything that you could want to stay ahead of the curve. Check out just how you’re going to get it done and find solutions that actually allow you to see the best out of what you’re going to do and how you want to make it all work at the same time.


The MBBR system consists of an aeration tank (similar to an activated sludge tank) with special plastic carriers that provide a surface where a biofilm can grow. The carriers are made of a material with a density close to the density of water (1 g/cm3). An example is a high-density polyethene (HDPE) which has a density close to 0.95 g/cm3. The carriers will be mixed in the tank by the aeration system and thus will have good contact between the substrate in the influent wastewater and the biomass on the carriers.[2]

To prevent the plastic carriers from escaping the aeration it is necessary to have a sieve on the outlet of the tank.


The MBBR system is considered a biofilm process. Other conventional biofilm processes for wastewater treatment are called trickling filterrotating biological contactor (RBC) and biological aerated filter (BAF). Biofilm processes, in general, require less space than activated sludge systems because the biomass is more concentrated, and the efficiency of the system is less dependent on the final sludge separation. A disadvantage with other biofilm processes is that they experience clogging and build-up of headloss. [1]

MBBR systems don’t need a recycling of the sludge, which is the case with activated sludge systems.

The MBBR system is often installed as a retrofit of existing activated sludge tanks to increase the capacity of the existing system. The degree of filling of carriers can be adapted to the specific situation and the desired capacity. Thus an existing treatment plant can increase its capacity without increasing the footprint by constructing new tanks.

When constructing the filling degree can be set to, for example, 40% in the beginning, and later be increased to 70% by filling more carriers. Examples of situations can be population increase in a city for a municipal wastewater treatment plant or increased wastewater production from an industrial factory. This is about Common Effluent Treatment Plant Design Process

Some other advantages compared to activated sludge systems are:[4]

  • Higher effective sludge retention time (SRT) which is favourable for nitrification
  • Responds to load fluctuations without operator intervention
  • Lower sludge production
  • Less area required
  • Resilient to toxic shock
  • Process performance independent of the secondary clarifier (due to the fact that there is no sludge return line)



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