Removal of COD and TOC from domestic wastewater by using alum and peels of sunflowers seeds as natural coagulant

Abstract

In this paper, the processes of coagulation and flocculation were employed for removing of organic matters expressed as total organic compounds (TOC) and chemical oxygen demand (COD) from domestic wastewater. Two types of coagulants were used alum (Aluminum sulfate (Al2 (SO4)3.18H2O)) and peels of sunflowers seeds which is used as natural coagulant. Jar test experiment was used in this study. The doses of coagulants (alum and peels of Sunflowers seeds) were 1, 2, 3, 4, 5 and 6 g/l, which added to the beakers for each coagulant. The experiments were conducted in two stages at the same operation conditions, the first stage was done using alum and the second stage was conducted using Peels of Sunflowers seeds. The results pointed that the maximum removal efficiency of COD using alum was 84.412 with dose of 6 g/l, while for natural coagulant (peels of sunflower seeds) was 54.436 at the same dose. The maximum removal efficiency of TOC using alum and peels of sunflower seeds were 64.336 and 36.302, respectively at the same dose 6 g/l. The results revealed that the removal efficiency of both COD and TOC affected by doses of coagulant so that the removal efficiency of COD and TOT increase as doses of coagulant increase. The removal efficiency of COD and TOC is higher for alum than peels of Sunflowers seeds.

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