Study and Performance Test of Biochemical ETP.

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 While working for this project we’ve found how much water is withdrawn every day, how much is used and how much is discharged. Different tests have been done to see the results of water ready to discharge or not, also studied the chemical consumption and cost also electricity cost. The results have been studied to comply with the government-approved limit or not. The lab was rich with enough instruments and manpower to have an estimated result. All 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. 7 days of data have been taken, 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. We found the most used chemicals are Sulfuric Acid, Ferrous Sulphate Heptahydrate, and Water Decoloring Agent (Bluwat.). And on average more than 4000m3 wastewater is processed biochemically. And every day on average temperature is found near 31°C, pH is found 7.7, BOD is found 15, COD 90.85, TSS 12.14 and TDS 2503. These are average amount that are found on discharged water after treatment. To run the biochemical ETP, the industry spends taka 20228 for electricity, 192593 takas for chemical per day, and for maintenance 1200000 takas. After working on this project, we’ve learned what procedures should be followed and what criteria should be used before discharging wastewater.