Environmental Assessment of Industrial Wastewater in Chittagong City-Bangladesh

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Author(s) Md. Khorshed Ali | Atik Sarraz | Preetom Kishore Roy | Ayesha Meherun Nahar | Ahmed Jubaer | Sagar Das | Roky Mallick
Pages 733-741
Volume 6
Issue 3
Date March, 2017
Keywords Chittagong City, Wastewater, Pollution, Analytical Methods, Target Parameter

The paper presents the quality of the wastewater of different industrial discharges in Chittagong City by finding out the values of various target parameters through analytical methods, i.e., pH, temperature, electrical conductivity (EC), percent sodium chloride (% NaCl), total hardness, alkalinity, total dissolved solids (TDS), total suspended solids (TSS), chloride, sulphate, phosphate, nitrite, nitrate, BOD, COD, and dissolved oxygen. The assessment revealed that the wastewater sample from Heliads Fashion Ltd. (S8) reported to be most polluted comparing all other samples. This industry is located in Basic Industrial area of the Baizid Industrial Zone. The study found the highest values of 10 major parameters i.e., temperature (ºC), pH, electrical conductivity (EC), total dissolved solids (TDS), total suspended solids (TSS), percent sodium chloride (%NaCl), dissolved oxygen (DO), alkalinity, chloride ions (Cl-), and nitrate ion (NO3-) from the samples of this industry. The average value of pH found from wastewater samples was above 7, which was alkaline in nature. KDS Accessories Ltd. (S4) sample wastewater of Nasirabad Industrial area reported lowest values of temperature, total suspended solids, and nitrite ions. On the other hand, highest values of total hardness and sulphate ions were found in this industrial effluent. Finally, highest BOD and COD values were reported in the samples of Quality Garments Ltd. (S9) at the Basic Industrial area. In summary, high volumes of different parameters were found in the industrial wastewater samples of Basic Industrial area as compared to Nasirabad area. Therefore, the assessment study found that the effluent of the industries of Basic Industrial area was more polluted than those of Nasirabad Industrial Area.

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