1 1 1 Mechanism COAGULATION coagulation all the

처리기술 1)응집기술 1 -1)응집 Mechanism COAGULATION • 응집 (coagulation): all the reactions and mechanisms that result in particle aggregation in water • 플럭형성공정 (flocculation): aggregation of destabilized particles and the precipitation products (physical process of producing particle contacts). Coagulation steps Coagulant formation → Particle destabilization → Physical interparticle contacts

Destabilization Mechanism

Hydrolyzing Metal Salt Coagulants Alum coagulation diagram (Amirtharajah and Mills, 1982).

Polyelectrolyte Coagulants

1 -2)인제거 Mechanism Chemical Phosphorus Removal Ø Chemical precipitation for phosphorus removal 1) Precipitation with calcium 2+ + 2 Ca + 2 HCO 3 + 2 Na. OH → Ca. CO 3(S) + 2 Na + CO 3 + 2 H 2 O 2+ 310 Ca + 6 PO 4 → Ca 10(PO 4)6(OH)2 2) Precipitation with aluminum and iron 3+ 3 -n + • With aluminum : Al + Hn. PO 4 ⇔ Al. PO 4 + n. H 3+ 3 -n + • With iron : Fe + Hn. PO 4 ⇔ Fe. PO 4(s) + n. H

Chemical Phosphorus Removal

Chemical Phosphorus Removal Ø Strategies for phosphorus removal

2 -1)탈취 Mechanism Emissions from Stack Odour control -foundries Sampling Site Anotec Treatment Samples sent to Laboratories

Malodour is rendered nonvolatile and is significantly reduced / eliminated Odour control -foundries Anotec array comes into direct contact with malodour The Anotec formulation is applied via a nozzle Malodour enters the stack

Compounds (ppb) Stack - Anotec (Fans Off) Stack - Anotec (Fans On) 1, 829. 8 1204. 9 106. 2 94. 14 141. 4 51. 3 24. 4 82. 74 1. 4 0. 2 85. 71 butanol 184. 5 8. 4 2. 6 98. 59 acetone 1, 165. 2 84. 4 16. 9 98. 55 2 -butanone 6. 1 5. 1 0. 8 86. 89 3 -buten-2 -one 2. 6 3. 0 2. 1 19. 23 236. 5 27. 7 7. 8 96. 70 2, 598. 8 269. 4 75. 6 97. 10 159. 4 14. 0 3. 2 98. 00 33. 7 0. 3 99. 11 1, 553. 8 209. 6 31. 3 97. 99 149. 9 76. 3 17. 1 88. 59 2, 770. 8 295. 8 85. 3 96. 92 89. 9 13. 8 4. 1 95. 44 4. 0 3. 2 1. 9 53. 00 ethanol i-propanol Odour control -foundries Raw Odour (Cooling) Removal Efficiency % ethylacetate methylacetate benzene methylhexanes toluene ethylbenzene m, p-xylenes o-xylenes hexane