Study of Bio-Chemical Effluent Treatment Plant (ETP) in Ananta Denim Technology Ltd.

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 While working for this project we’ve found how much water is withdrawn every day, how much is used and how much is discharged.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.