Elementary Principles 230 - 6.83 (cont'd) b. Acid is...

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6- 64 6.83 (cont’d) b. Acid is corrosive to pipes and other equipment in waste water treatment plant. c. Acid feed : 1000 kg H SO / h (2000 ) kg / h 0.10 8000 kg H O / h 24 w w2 + =⇒ = ± ± m m Overall S balance : 1000 kg H SO 32 kg S h9 8 k g H S O (kg / h) (0.96 0.04 ) (kg CaSO ) 32 kg S kg 136 kg CaSO (kg / h) (kg CaSO ) 32 kg S 5a 4 4 8a 4 4 = + + ⇒= + + ± ± .. ± (. . ) . ± () mX m X aa 3265 02353 096 004 02353 1 58 Overall N balance : 1000 kg HNO 14 kg N h6 3 k g H N O 0.04 (kg / h) (1 501 ) (kg Ca(NO ) ) 28 kg N 164 kg Ca(NO ) (kg / h) (1 501 ) (kg Ca(NO ) ) 28 kg N 164 kg Ca(NO ) 3 3 3 2 32 3 2 = + + ± ± ± . ± ( ) 222 2 000683 1 501 0171 1 501 2 Overall Ca balance : ±± ± ± ± . ± . ± . ) . ± . ± . ± m (kg/h) 40kgCa 100kgCaCO m (kg / h) (0.96 0.04X ) (kg CaSO ) 40 kg Ca kg 136 kg CaSO
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