Treated wastewater assessment of textile dyeing industries in Gazipur, Bangladesh

Abstract

Over the last several decades, the textile industry has grown to constitute a significant element of Bangladesh's economy. Many of the textile or garment industries are situated in Gazipur and many of them are dyeing industries.That is why Gazipur was picked as the location for this research. However, the garment industry is associated with a number of environmental issues, the majority of which are caused by wastewater created by the textile industry, which is linked to pollution and climate change. However, research has revealed that the turag river in Gazipur is in danger, and that harmful elements have been discovered in the soil and food. In Gazipur, BOD, pH, and electrical conductivity were also found to be out of control. As a result, this study was carried out to ascertain the current state of treated wastewater quality, examine the role of government in wastewater quality management, and determine how water quality is related to human and environmental health. Six samples were taken from six different locations within the Gazipur district. Samples 1, 2, 4, 5, and 6 were principally gathered. The data for samples 3 was gathered using their most recent test results. Despite my inability to gain access to the industry, I took sample 6 from outdoors as they were dumping not properly treated wastewater from an external pipe. External and internal labs were used to test DO (dissolved oxygen), TSS (Total Suspended Solids), TDS (Total Dissolved Solids), pH, Temperature, BOD (Biochemical Oxygen Demand), and COD (Chemical Oxygen Demand). The interview was performed in person with each industry's management and employees, and some local people. To gain an accurate estimate of industrial wastewater in the dyeing industry, several research articles and peer-reviewed publications were reviewed on various trustworthy sources published between 1997 and 2022. The result of water quality analysis of sample six exhibits excessive amounts of BOD, DO, COD, and TSS, which violates government rules and contributes to a dangerous

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environment, according to the water quality results. Although sample 1, 2, 3, 4, and 5 were confident in the quality of their treated water during the interview, the test results reveal that not all of their metrics were appropriate. The BOD and TDS, for example, are greater in sample 4. COD levels in Sample 1 were likewise found to be in the non-acceptable range of 205 mg/L, whereas they should be equal to or less than 200 mg/L according to government guidance. However, wastewater reuse is strongly recommended as so much water is lost in this business every day. Indeed, the government needs to be more stringent.