Urea granulation process with scrubbing system including several waste streams for removal of dust and ammonia from the off-gas of a urea granulation unit comprising • a urea granulator 1, • granulator scrubber dust stage 2, • granulator scrubber acid stage 3, • product coolers 5, • a product cooler scrubber dust stage 4, and • an evaporation unit 6, • a condenser unit 7 whereby • a first stream of fresh air 8, running through a first sequence of process steps, being send into the urea granulator 1, whereby • dust- and ammonia-laden air 9 being drawn off from the granulator 1 and conveyed into a granulator scrubber dust stage 2, followed by a granulator scrubber acid stage 3, in which stage the ammonia-laden air 12 being contacted with an acid in liquid 22 phase and ammonia being scrubbed from that air by the generation of an ammonium salt, • a second stream of fresh air 15, running through a second sequence of process steps, being used for cooling the product drawn off from the urea granulator 1, whereby • said cooling being performed in product coolers 5, • thereby said air being heated up, and afterwards being conveyed to a product cooler scrubber dust stage 4, • the clean off-gas 13 drawn off from the granulator scrubber acid stage 3, and the clean off-gas 18 drawn off from the product cooler scrubber dust stage 4, being released into the atmosphere 19, characterized in that the scrubbing system being passed, which in itself being a complete closed system, whereby • the ammonium salt solution stream 23 from the granulator scrubber acid stage 3, being fed into said product cooler scrubber dust stage 4, whereby the ammonia of the dust-laden air stream 17 exiting the product coolers 5 being removed, and • the released liquor 24 from the product cooler scrubber dust stage 4 and the released liquor 11 from the granulator scrubber dust stage 2 being send to the evaporation unit 6, • the vapour stream 29 from the evaporation unit 6, which contains ammonia being given into the condenser unit 7, which releases a liquid process condensate 30, and said liquid process condensate 30 being given into the granulator scrubber acid stage 3, and • the concentrated liquor stream 28 from the evaporation unit 6, containing urea and ammonium salt, and a urea melt 26 from a synthesis unit 27 being conveyed into the urea granulator 1, separately. • a urea granulator 1, • granulator scrubber dust stage 2, • granulator scrubber acid stage 3, • product coolers 5, • a product cooler scrubber dust stage 4, and • an evaporation unit 6, • a condenser unit 7 • a first stream of fresh air 8, running through a first sequence of process steps, being send into the urea granulator 1, whereby • dust- and ammonia-laden air 9 being drawn off from the granulator 1 and conveyed into a granulator scrubber dust stage 2, followed by a granulator scrubber acid stage 3, in which stage the ammonia-laden air 12 being contacted with an acid in liquid 22 phase and ammonia being scrubbed from that air by the generation of an ammonium salt, • dust- and ammonia-laden air 9 being drawn off from the granulator 1 and conveyed into a granulator scrubber dust stage 2, followed by a granulator scrubber acid stage 3, in which stage the ammonia-laden air 12 being contacted with an acid in liquid 22 phase and ammonia being scrubbed from that air by the generation of an ammonium salt, • a second stream of fresh air 15, running through a second sequence of process steps, being used for cooling the product drawn off from the urea granulator 1, whereby • said cooling being performed in product coolers 5, • thereby said air being heated up, and afterwards being conveyed to a product cooler scrubber dust stage 4, • said cooling being performed in product coolers 5, • thereby said air being heated up, and afterwards being conveyed to a product cooler scrubber dust stage 4, • the clean off-gas 13 drawn off from the granulator scrubber acid stage 3, and the clean off-gas 18 drawn off from the product cooler scrubber dust stage 4, being released into the atmosphere 19, • the ammonium salt solution stream 23 from the granulator scrubber acid stage 3, being fed into said product cooler scrubber dust stage 4, whereby the ammonia of the dust-laden air stream 17 exiting the product coolers 5 being removed, and • the released liquor 24 from the product cooler scrubber dust stage 4 and the released liquor 11 from the granulator scrubber dust stage 2 being send to the evaporation unit 6, • the vapour stream 29 from the evaporation unit 6, which contains ammonia being given into the condenser unit 7, which releases a liquid process condensate 30, and said liquid process condensate 30 being given into the granulator scrubber acid stage 3, and • the concentrated liquor stream 28 from the evaporation unit 6, containing urea and ammonium salt, and a urea melt 26 from a synthesis unit 27 being conveyed into the urea granulator 1, separately.