Can alum be used as an alternative coagulant at mjwtw?

This study investigated the use of an alternative coagulant to the traditional use of alum at MJWTW. The effectiveness of five coagulants, namely Anhydrous Poly Aluminium Chloride (APAC), Poly Aluminium Chloride (PAC), Primco 100, Zetafloc 4030 and alum (control) was investigated by flocculation tests in a laboratory using Lake Chivero water.

Does aluminium sulphate increase EC in treated water?

Residual aluminium in treated water could explain the increase in EC for aluminium sulphate. This finding concurs with the findings by Srinivasan et al. (1999) and Gebbie (2006) who reported that the use of aluminium sulphate as a coagulant often produces higher aluminium concentrations in the treated water than in raw water.

Does alum reduce turbidity?

The use of alum as a coagulant reduced the turbidity by 53% which was relatively lower than that (72%) of Primco 100. Primco 100 achieved the standard turbidity value of 1 NTU suggested by WHO (2006) for conventional water treatment, whereas alum did not.

How is potable water treated at mjwtw?

Potable water treatment at MJWTW involves a combination of conventional treatment processes: aeration, coagulation, flocculation, sedimentation, filtration, stabilisation (through lime addition) and disinfection ( Hoko & Makado 2011 ). A water treatement flow scheme adapted from Hoko & Makado (2011) is shown in Figure 2.

Which chemicals are effective in treating heavily polluted water?

Some of the chemicals that have been reported to be effective in treating heavily polluted water are Poly-Aluminium Chlorides (PACs), Primco and Zetafloc ( Gebbie 2006 ).

Does alum affect the taste of water compared to polymeric coagulants?

It can therefore be concluded that the use of alum results in increased EC and aluminium content in the treated water compared to APAC, PAC Primco 100 and Zetafloc 4030. Thus, alum has potential to have an effect on the taste of water compared to polymeric coagulants.