This work deals with the recovery of liquid effluent by thermal evaporation. The effluent is a digestate of pig manure which is subjected to anaerobic digestion and phase separation by centrifugation. Its dry matter is about 2.3%. The goal is to minimize its water content and to use it as a fertilizer on agricultural soils. The evaporator consists on a stainless steel plate inclined by 30°. The plate is exposed to solar simulator radiations which heat flux is about 452W/m² in average. Once plate temperature is stabilized, the liquid is injected from the top of the plate. The cartography of the plate temperature is obtained by two methods; the first is measured and the second is made by calculating from thermal balances. Evaporation tests were performed. The device is, on one hand, covered with a glass, and removed, on the other hand. A comparison between measured evaporated mass flow and calculated from mass balances is determined in laminar regime. It depends on many parameters, especially on heat flux, air, plate and liquid temperature.

Full text: IJEIR_2318_FINAL.pdf