Flash dewatering for raw sewage effluents

Author(s): Hussein K. Abdel-Aal*; and T. Nejat Veziroglu

Abstract

Sewage effluents contain more than 90% water. Basically the dewatering process of sewage effluents is simply a kind of evaporation. Our proposed concept involves a two-phase process that uses what is named “Multi-Stage Flash Evaporation” (MSFE) in handling sewer sewage. The first phase is known as drying, followed by boiling the sludge in the second phase. This leads to the separation of the solids from the water. Dewatered sludge is directed to an incinerator, which produces high-pressure- steam (HPS) that fuels a generator, to produce electricity. The proposed scheme is described and a diagram is presented. Prior to this evaporation step, the water content of the sewage effluents could be reduced to the half by the primary treatment. Water collected at this stage could be utilized for irrigation purposes. The feed to the MSFE unit could be any kind of biomass from sewage sludge, animal byproducts, or agricultural byproducts. Following the study made by Janicki bioenergy using S 200 Omni Processor, it is anticipated to obtain the following results for our proposed scheme. For a daily input of 10 tons of dry feed, along with 70 tons of combined water, an output of 300 KW and 70,000 liters water may be obtained. Further treatment and ultra-refining steps are carried out for the produced water to make it suitable to drink.

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