Wastewater Treatment Using Lime and Sea Salt Brine PDF

Keywords

wastewater, sea salt brine, table salt production

Abstract

The wastewater treatment process described in this paper is based on utilising sea salt brine as a source of magnesium for coagulation. Sea salt brine, a by-product of table salt (NaCl) production from sea water, is a rich source of magnesium and is relatively free of sodium. Magnesium hydroxide is an effective coagulant in water and wastewater treatment. The precipitation of magnesium in conjunction with lime treatment significantly improves the performance and economics of lime use. The sea salt brine provides a cheep source of magnesium for enhancing lime performance in municipal and industrial wastewater treatment. The process was capable of achieving the following removal results: 76% B0D5,71% COD, > 99.9% Faecal Coliform, 90% turbidity, 96% total phosphorus, 98% soluble phosphorus, 96% TSS, 85% filtered colour and 43% TKN. This treatment is highly effective for removing phosphorus, turbidity, colour and pathogens. The treated effluent may be suitable for discharge and reuse for irrigation and industrial applications. The efficient removal of pathogens eliminates the need for effluent disinfection. The process results in a chemically stable and easy to dewater sludge suitable for land application.