nfcl, mangalore dap/npk plant feasibility study - Environmental ...

2ANNEXURE-VIIIwhereas the other 55-65 % is sent by the above mentioned Cooler & DedustingScrubber to be jointly washed with the gases coming from Dedusting Cyclones.ScrubbingA powerful scrubbing system has been designed not only to remove effluents from gasstreams, but also to recover the nutrients, thus increasing plant efficiency.The scrubbing system for this plant consists of three washing steps:1st step: Granulator Pre-Scrubber, a low pressure venturi with cyclonic tower scrubberthat includes also a Duct Scrubber.2nd step: Granulator Scrubber, Dryer Scrubber and Cooler & Dedusting Scrubber, allof them Venturi Scrubber with Cyclonic separator tower.3rd step: Tail Gas Scrubber — two step scrubber with a Duct washing Scrubber and aPacked Tower Scrubber.EXPECTED EMMISSIONSGaseous EmissionsThe following maximum limits shall be used as a basis for ambient air qualitystandards, measured at measuring points on stack. Following limits are stringentwith respect to CPCB norms.NPK / DAPStack air outlet : 430000 m3/hr (expected) from each unit of two plantsParticulates : ≤ 75 mg/Nm 3Fluorine : ≤ 15 mg/Am³Ammonia : ≤ 75 mg/Nm 3Fugitive Air EmissionFugitive emission is expected from the various sources of the Plant. e.g,