Comparative analysis of energy consumption and economy on the treatment of reverse osmosis concentrated water by solar vacuum membrane distillation and fertilizer draw forward osmosis
There are many experimental studies on the treatment of reverse osmosis(RO)concentrate by solar vacuum membrane distillation(SVMD)and fertilizer draw forward osmosis(FDFO)systems,but few on the energy consumption and economic analysis.Through the comparative analysis of the membrane flux,energy consumption and economic analysis of the two systems under the conditions of experimental scale and industrial scale,the results show that under the condition of experimental scale,the RO concentrated water is concentrated by 4 times,the membrane flux of the SVMD system without auxiliary heat source is 2.46 kg/(m2·h),the specific energy consumption is 110.6 kWh/m3,and the unit water production cost is 96.6 yuan/m3;the membrane flux of the SVMD system with auxiliary heat source is 3.75 kg/(m2·h),the specific energy consumption is 230.7 kWh/m3,and the unit water production cost is 13.4 yuan/m3;the membrane flux of the FDFO system is 3.62 kg/(m2·h),the specific energy consumption is 20.44 kWh/m3,and the unit water production cost is 26.8 yuan/m3.Under the condition of industrial scale,when the design water output is 240 m3/d,the specific energy consumption of the SVMD system is 12.8 kWh/m3,and the unit water production cost is 10.8 yuan/m3,and the specific energy consumption of the FDFO system is 12 kWh/m3,and the unit water production cost is 9.38 yuan/m3.It can be seen that the larger the production scale,the smaller the water production cost of different systems,and the smaller the difference.
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