Proven Effluent Recycle Technology for Pharma Effluent…..


 

The silver bullet solution is

SBR+RO.   Sequential Batch Reactor  +  Reverse osmosis.

 
 

SBR  Technology is

  • the least Capital & Operating costs.

  • Very Flexible for varying input conditions.

  • COD reduction from  >10,000mg/lit to <300mg/lit

  • NH3  reduction from  >500mg/lit to  <50mg/lit     

     

 
       
 
 

SBR – Sequential Batch Reactor

 
       
     
  Reverse Osmosis  
                          

 
 
RO  for Least Capital & Operating costs
Effluent Recovery 70% recycled back to process.
 
       
     
   
 

The  synthetic pharmaceutical manufacturing plants  produce a number of finished products and intermediaries in batch processes in various combinations and production campaigns.  They also  use a  wide variety of  chemical processes  during the production  of  different  molecules , like sulphonation, friedel crafts reaction, nitrification, extraction, purification and packaging.  Because of the low yield in each step, the pharma effluents are known to contain high concentration of organic compounds (COD) and total solids,  and solvent.   Besides variety and high concentration, the effluent  are also  inconsistent,  and vary widely depending on the product manufactured, materials used  and the processing details .

For the reasons mentioned above, the  Pharmaceutical effluents are  very challenging to treat.  The conventional activated sludge is not sophisticated enough to treat such a widely varying concentration of  chemicals.  Of the several chemicals used  there  is eminent  possibility that some are strongly inhibiting also.  The presence of pharmaceutical compounds in surface waters is an emerging environmental issue.

Almost All the industries have  effluent treatment plants. All of them  have gone through several modifications  adding one or more equipments till there is no more to add… and yet the desired results  generally, have not  been achieved.     Industries  starts wondering   what is the path forward?

The silver bullet solution is SBR+RO.   Sequential Batch Reactor  +  Reverse osmosis.

This system is low in capital and operating cost.
The reliability of this system will far exceed that of conventional activated sludge and Disc membrane system

 
                                                       
    

Sequencing Batch Reactor

The sequencing batch reactor (SBR) is a fill-and-draw activated sludge system for wastewater treatment. In this system, wastewater is added to a single "batch" reactor, treated to remove undesirable components, and then discharged. Equalization, aeration, and clarification can all be achieved using a single batch reactor using a timed control sequence

The wastewater enters a partially filled reactor, containing biomass, which is acclimated to the wastewater constituents during preceding cycles. Once the reactor is full, it behaves like a conventional activated sludge system, but without a continuous influent or effluent flow. The aeration and mixing is discontinued after the biological reactions are complete, the biomass settles, and the treated supernatant is removed.

Advantages

  SBRs extremely flexible operation to adapt to different effluent characteristics.
  SBR is cheaper compared to conventional Activated sludge as secondary clarifiers and other equipments are eliminated.


Process Sequence of SBR System




Fill :
The fill process typically allows the liquid level in the reactor to rise from 25 percent of capacity (at the end of idle) to 100 percent.The fill process normally lasts approximately 25 percent of the full cycle time.

React :
To complete the reactions that were initiated during fill.typically,
reaction takes up 35 percent of the total cycle time.

Settle :
To allow solids separation to occur, providing a clarified supernatant to be discharged as effluent.

Draw :
The purpose of draw is to remove clarified treated water from the reactor. The time dedicated to draw can range from 5 to 30 percent of the total cycle time .

Idle :
The purpose of idle in a multi tank system is to provide time for one reactor to complete its fill cycle before switching to another unit.

  
 
 
 
 
 

RO membranes for recycle of treated effluent.

RO membranes are designed to handle only raw water. Hence to get the maximum performance from the RO membranes , the effluent must be treated to the best possible as close to the raw water quality as possible. Hence the performance of ETP plays a very important role in reducing the fouling of membranes.

As shown above the proper design of SBR will give the best treatment to the effluent and hence Feed to RO.

 
 
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