F. M. Mohamed¹ and M.H. Abdo²

¹Holding Company for water and waste water, Ministry of Housing

²National Institute of Oceanography and Fisheries, Ministry of Scientific Research.

Summary: The present study is a highlight to remove some dangerous pollutants such as arsenic, lead and fluoride in waste water. The treatment using novel poly inorganic coagulants. The eight novel poly inorganic  coagulants were prepared, and characterized namely, poly aluminum chloride (PACl), poly aluminum chloride silicate (PAClSi), poly aluminum hydroxysulphate (PAHS), poly aluminum hydroxy sulphatesilicate (PAHSSi), poly ferric chloride (PFeCl), poly ferric chloridesilicate (PFeClSi),  poly aluminum ferric chloride (PAlFeCl), and poly aluminum ferric chloride silicate (PAlFeClSi). It was found that; the maximum percentages removal of  F,  As and Pb ions from waste water  reached  99, 97 and 98%,  using PAlFeClSi, PAlFeClSi and PFeClSi, respectively. Therefore, poly inorganic coagulants impregnated with silica and considered as a good coagulant for waste water treatment due to the low cost and good efficiency in this application. Also, it will solve the problem of water shortage and to sustain non-conventional water resources.