Wednesday, 5 October 2016

DM WATER COST ESTIMATION


                          DM WATER COST ESTIMATION





Based on the January -2001 data:











A. FILTER WATER COST ESTIMATION




Total Water processed = 581975 m3 / month

I. Chemicals consumption in PTP





Name of the Chemical quantity Kg for the month cost of the chemicals spent in Rs



Alum 31700 117783.7



Chlorine 3600 25000.3



Polyelectrolyte 12 2227.7










Total Chemical cost per m3 of water = 0.2492 Rs / m3

II.Power consumption in PTP












Service   Power consumption in KWhr



Clarifloculator 1.5 kw*3*24*31 3348



Alum Dosing pump 1.56*24*31 1160.64



Alum Dosing stirrer 2.24*24*31 1666.56



Stilling chamber 3.5*24*31 2604



Air Blower in Sand filter 18*0.25*32 144



Raw water Pump 45*24*31 33480









Total power consumption per m3 of water = 0.073 kwhr / m3

Taking the cost of the power as 1Rs/Kwhr




Total Power cost per m3 of water = 0.073 Rs / m3








III.Water used in Backwashing in PTP



For one regeneration 400 m3 of water is used & there were


 32 regenerations during the month of January



Hence water lost per m3 of filter water  = 0.022 m3 / m3 of

Cost of Raw water = 1 Rs/ m3

filter water

Therefore


.









COST OF 1 m3 OF FILTER WATER = (1+ 0.2492+0.073)/(1-0.022)


                    = 1.352 Rs / m3

















             
DM WATER COST ESTIMATION    
   
Based on the January-2001 data:    
             
  Total Water processed = 109514 m3 / month    
FAC      
Power consumption of Filter water pump =     49104 kwhr / month    
Hence            
Cost of water at FAC I/L = 1.80 Rs / m3      
For one Backwashing 30 m3 of water is used & there were            
 10 regenerations during the month of January            
Hence Filter water lost per m3 of DM water = 0.003 m3 / m3 of DM    
        water    
Therefore            
Cost of water at FAC O/L = 1.805 Rs / m3      
             
             
             
Power consumption in Degasser            
             
  Service   Power consumption in KWhr      
  Blower 3 kw*2*24*31 4464      
  Pump 30kw*3*24*31 66960      
             
Total power consumption per m3 of water = 0.652 Kwhr / m3    
Taking the cost of the power as 1Rs/Kwhr            
Total Power cost per m3 of water = 0.652 Rs / m3    
             
             
             
Chemicals required in DM chain based on ionic load:      
Total cation load            
             
  Ca   +    Mg                 =  98 ppm as CaCO3      
  Na                              = 50 ppm as CaCO3      
  K                                =   4 ppm as CaCO3      
             
  Total cation load       =          152 ppm as CaCO3      
                                    = 152/50 milliequivalents of CaCO3/Litre      
       1 milliequivalent of CaCO3 will react with 1 milliequivalent of 100%HCL          
             
             
   No of milliequivalents of 100%HCL required  =      152/50   meq of HCL /Ltr    
                 = 3.04*36.5*0.001 Kg of HCL/m3    
             = 0.11096 Kg of HCL/m3    
                        100%HCL density   =   850 Kg/m3    
                        30%HCL  density    =    955 Kg/m3    
             
    Kg of  30%HCL required/m3 of water      =      0.11096/0.3      
                 = 0.3699      
             
             
             
             
  Total Anion load :          
  Chloride                      =  32.4 ppm as CaCO3      
  Sulfate                        =  27.1 ppm as CaCO3      
  Bicarbonate                 =  90 ppm as CaCO3      
  SiO2                           =  10 ppm as CaCO3      
             
  Total Anion load        =  159.5 ppm as CaCO3      
         
     100%NaOH density   = 2041.67 Kg/m3      
      48%NaOH density    =  1500 Kg/m3      
             
  Kg of 100%NaOH required/m3     =      159.5*40*.001/50        
                    of water          
                                    = 0.1276        
  Kg of 48% NaOH required/m3   =   0.1276/0.48        
                    of water          
                                     =     0.2658        
             
  Total chemical cost    =  2.83 Rs /m3      
             
  Taking 10% water as backwash and rinse water          
  Cost of backwash and rinse water =    0.1805 Rs / m3    
             
  Resin Depreciation cost =  0.35 Rs /m3      
             
  Total DM water cost =                5.8  Rs /m3 of DM water      
             
             
             
DM water cost based on actual chemical consumption :    
             
  30% HCL Consumption =  77.72 MT /Month      
             
  48%NaOH consumption= 35.2 MT /Month      
             
  Actual chemical cost    =  4.205 Rs / m3      
             
  Total DM water cost   = 7.2 Rs / m3 of DM water      
             
             
             
If ionic load increases by  4 times      
             
             
  Chemical consumption in PTP =   0.997 Rs /m3    
             
  Filter water cost  =  2.116 Rs / m3      
             
  Cost of water at FAC O/L 2.571 Rs / m3      
             
  Total chemical cost = 11.31 Rs / m3      
             
             
  Total DM water cost   = 16.3 Rs / m3      
             
             
             
Process Condensate Treatment Cost            
             
Based on March month data            
             
Total water processed in March     =             109921 m3/month      
             
  30% HCL Consumption =  26.595 MT /Month      
             
  48%NaOH consumption= 18.39 MT /Month      
             
Total Chemical cost/m3 of PC water   1.81 Rs / m3 of PC water      
             
             
             
             


























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