Efficiency of chlorine based ...

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Efficiency of chlorine based disinfection against E. Colli is limited. Especially if biofilm protected forms exist. As TSS is relatively low I would go with UV treatment as the last phase of treatment after biology and final settling (sludge removal). Pls check dissolved Fe in water. If you use Fe-salts to enhence coagulations to obtain good settling sludge you may need more UV dose to combat E. Colli.

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