Comparative Study Between Biochemical and Chemical Etps

Abstract

The Effluent Treatment Plant is one of the most important parts in the textile industry, mostly necessary for the dyeing, printing and washing section. We faced lack of water due to global warming. For this reason ETP is a major part of every factory. Here we choose two factories, one factory can be used chemical ETP and another factory can be used biochemical ETP. We are working to learn about biochemical treatment plants and chemical treatment plants, which types of procedures are used and what tests are done before releasing water. We deeply studied about this and learned about the standard procedure. Doing this project we noticed how much water withdrawn each day and how much water released each day. We learned about the chemical utilization and cost. Biochemical ETP labs are more developed but chemical labs are poor, but try to collect the test results. We try to compare with lab data and the government standard data. In biochemical ETP plant maximum test is done but in chemical ETP plant only three tests are done. Then we try to compare with government standard data. Both industries try to properly utilize chemicals. PAC is used in large quantities in both ETP plants. One month's data is taken. Biochemical ETP processed 7200m3 waste water per day and the chemical ETP processed 90 m3 per day. In biochemical ETP , pH is 7.44, BOD is 18, COD 143, TSS 28.27 and TDS is found 798.In chemical ETP , pH is found 7.45,TDS data is found 797. Every month an audit is held by the ITS. They mainly check the procedure and condition of discharge water and every process is done by the standard measurement or not. Chemical cost for biochemical ETP is 1726337 BDT, and chemical cost of chemical ETP is 855490 per month .From this project we learned about which types of process sequence is done and which process is done before discharging water. We compared two types of ETP .From this comparison we think that biochemical ETP is costly but the discharging water is eco-friendly for the environment.