2.2 Analytical methods
The organic strength of the wastewater was determined by
TOC analyzer (TOC LCPN, Shimadzu) meanwhile the clarity
of the wastewater was determined by portable turbidimeter
(2100Q, Hach). The ionic conductivity and TDS of the sample
solutions were determined using a benchtop conductivity
meter (4520, Jenway). Colour and sulphate concentration of
the sample solutions was detected by a UV-vis
spectrophotometer (DR5000, Hach).