A similar trend was observed for TDS reduction at different
stages of the treatment process. According to Fig. 6,
it can be seen that adding the coagulants sharply decreased
the TDS of the effluent. For PACl and FeCl3, the TDS
removal efficiency was 68 and 50 %, respectively. The
greater value of TDS in the case of using FeCl3 (900 mg/
lit) was related to the higher release of Cl- ion by this
coagulant, which in overall increased the TDS of the
treated water (Gebbie 2001).