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.
For full article - jubaer.ahmed@eqmscl.com
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