Abstract:
ETP or Effluent Treatment Plant is one of the most crucial parts of wet process. As
Global warming is increasing at an alarming rate and we may lack water to use or consume, ETP is a must for every factory with dyeing/printing/washing department.
For this project we studied on biochemical treatment plant. We are working to know
more about biochemical treatment plant, what procedures are used in this plant and
what tests are done before discharging water. While working for this project we’ve
found how much water is withdrawn every day, how much is used and how much is
discharged. We took different tests of the discharged water to see is that was ready for
discharge or not. We also studied the chemical consumption and cost. And we studied
if the results met the government approved limit or not. The lab was rich with enough
instruments and manpower to have an estimated result. All of the tests were done
almost every day, only two of them were taken once a week. All the results are
documented daily to overview at the end of the month. They had every day and
months entry on their doc-book. We took 15 days of data, daily chemical
consumption, water consumption for the processes and discharged water. Not all of
the tests were taken daily, some of them such as BOD and COD tests were done only
once a week. Then the results were compared to the government standard. The results
were never out coming as fail, because the industry uses the chemicals in a limit and
never let the chemicals exceed their limit. Once in every month audit on behalf of ITS
comes to see the condition of discharged water as well as if the full process were
being done according to proper measurement or not. We found the most used
chemicals are PAC and PAM. And on average more than 2500m3 waste water is
processed biochemically. And every day on average temperature is found near 290
c, pH is found 7.44, BOD is found 18, COD 143, TSS 28.27 and TDS 798. These are
average amount that are found on discharged water after treatment. To run the
biochemical ETP, the industry spends taka 189,000 for electricity, taka 1164971for
chemical and for maintenance 120,000After working on this project we’ve learned
what procedures should be followed and what criteria should be used before
discharging waste water.
