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  • Users: aahmed
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  1. aahmed

    High COD in treated effluent

    Thnaks Bimr We normally used to operate MLSS ~6000 ppm. Design data is ~5600 ppmNormally our DO remains 2-3 ppm when effluent COD is normal. With this increase in effluent COD,DO level is increasaed to 6+ ppm although aeration rate is as such fixed-no change.Pl tell activated sludge process is...
  2. aahmed

    High COD in treated effluent

    Thanks Watthour At the moment we have no facility and experience to judge microbiology of organisms, however we are trying to get it checked by some expert. In this regard, pl give your opinion We have extended air system which goes directly into bioreactor from a compressor. What is "DAF" ?am...
  3. aahmed

    High COD in treated effluent

    Hi All For last 15 days we are facing high COD of our treated effluent and we have have aatken all known actions but its not restoring. Urgently need advice. Below are details: We are operating an activated sludge waste water treatment plant. This an aerobic system involving deepshaft...
  4. aahmed

    Silica Slippage in Demin Water

    Thanks Bimir for your reply Check the age of resin. If the anion is older than 7 years, think about replacement.( we replensih 33% resin each year) 2. Check the season. Silica concentration may change seasonally.( yes silica is changing from 5 to max 8.7 ppm. But pl note that at 7 ppm,tranis...
  5. aahmed

    Silica Slippage in Demin Water

    Hi everybody we have two sets of SAC and SBA anion resins.We are using Rohm and Hass Resins.Total silica in our feed water varies ( open surface water) between 5-8 ppm.Now we are facing problem of silica slippage from anions at same throughputs where we used to see normal results.our limit is...
  6. aahmed

    Suggest some technical Books

    Thank you all We are a petrochemical plant. We already have perry' chrmical engineers gand book. I want to add some process engineering/ chemical engineering related books Thanks Best Regards aahmed
  7. aahmed

    Suggest some technical Books

    Dear Forum Members I am achemical engineer working in a manufaturing plant. We are going to establish a technicalbook bank at our plant. Kindly suggest me some useful and good books which you recommend for chemical / process engineers which we should bought. Thanks Best Regards aahmed
  8. aahmed

    Acid tank level indication

    HI all I suggest ultrasonic level transmitter is off course a good option. However, we have experienced that some times, this sensor malfuntions if there are extensive fumes generation and hence condensation on sensor. Similarly, in case your tank pressurizes,then it may again malfunction...
  9. aahmed

    Thermal shocks in vertical falling thin film evaporators

    Thanks SREisme Units of measurement is 4 tonnes/ hr ( equal to 4000 kg/h ).. I understand what you said.Unfortunately,here we don't have facility of internal inspection of crack mechanism. Say we start operating evaporator on continuous basis ( process wise,we don't have ant problem with...
  10. aahmed

    Thermal shocks in vertical falling thin film evaporators

    Hi am a chemical engineer and new to this forum.Below is my problem statement: We have a vertical thin film evaporator used to remove solvent from a slurry ( containing 10 - 12 % solids ).HP steam ( 100 barg ) is let down through a PCV upto 50barg ( obviously a SH steam) and goes to four...

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