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Water treatment

Figure 4.2. Layout of

Figure 4.2. Layout of Retiro MSF plant. UGFL 1, 2, and 3 plus SSF 1 and 2 made up the first phase (1987). DyGF stage and other treatment units were introduced later SSF UGFL SSF UGFL DyGF 1 DyGF 1 Raw Water Photo 4.7. Aerial view of Retiro MSF water treatment plant during 1990s. Cali, Colombia. 141

• Turbidity of raw water, settled water, effluents of UGFL units and effluents of SSF units were in the ranges 2.1 to 140, 1.6 to 65.8, 1.0 to 16, and 0.45 to 2.5 NTU respectively. • Mean faecal coliform levels in raw water, effluents of UGFL units, and effluents of SSF units (before terminal disinfection) were 15,978, 1,680, and 14 MPN/100 ml. • Colour levels in raw water, effluents of UGFL units, and effluents of SSF units (before terminal disinfection) were in the ranges 9 to 250, 2.5 to 70, and