Softening. Design of 4 th. Mega location Oasen. CT 5520 Drinkingwater Treatment 2. Floor van den Berg Udo Ouwerkerk. June 1, 2007

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Hector Carter
5 years ago
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1 Softening Design of 4 th Mega location Oasen CT 5520 Drinkingwater Treatment 2 June 1, 2007 Floor van den Berg Udo Ouwerkerk 1 Vermelding onderdeel organisatie

2 Contents 2 nd Phase, Softening: PID Process flow diagram Hydraulic line 3 th Phase, Scaling up: PID Process flow diagram Hydraulic line Pellet reactor: Storage / lay out Chemicals Dimensions Construction June 1,

3 2 nd Phase, softening Riverbank groundwater 3 M m³/year Dry Filtration Dry filtration 1 M m³/year Riverbank groundwater 3 M m³/year Aerobe Softening 4 M m³/year Dry filtration Wet filtration 2 M m³/year Wet filtration AC Filtration 6 M m³/year AC Filtration UV Disinfection UV-disinfection CW Reservoir CW Reservoir June 1,

4 PID, 2 nd Phase June 1,

5 Process scheme 2 nd Phase June 1,

6 Hydraulic line, 2 nd Phase June 1,

7 3 th Phase, Scaling up Riverbank groundwater Dry filtration Softening (5.7 M m 3 /yr) Wet filtration AC Filtration UV Disinfection CW Reservoir 4 M m³/year 8.5 M m³/year 2.8 M m³/year Riverbank groundwater Dry filtration Wet filtration AC Filtration UV-disinfection CW Reservoir 4.5 M m³/year June 1,

8 PID, 3 th Phase June 1,

9 Process scheme, 3 th Phase June 1,

10 Hydraulic line, 3 th phase June 1,

11 New building Softening reactors Carry over filtration Seeding sand storage Pellet storage Seeding sand washer Disinfection storage Chemical storage June 1,

Storage Seeding sand washer small particles are washed out caustic soda is added for disinfection Disinfection storage no bacteriological contamination Chemical storage NaOH is diluted to a

12 Storage Seeding sand washer small particles are washed out caustic soda is added for disinfection Disinfection storage no bacteriological contamination Chemical storage NaOH is diluted to a 25% solution Seeding sand storage 2 tanks of 3m 3 would be sufficient for 8 months in the 2nd fase and for 5.5 months Pellet storage: 2nd phase: 102,63 kg/h 3th phase: 145,47 kg/h June 1,

13 Pellet Reactor Chemicals Amount of Chemicals 2 nd Phase Amount of chemicals 3 th Phase Dimensions Dimensions 2 nd Phase Dimensions 3 th Phase Construction June 1,

14 Chemicals, 2 nd / 3 th Phase Ca 2+ = 2.05 mmol/l, raw water Mg 2+ = 0.45 mmol/l, raw water 1.55 mmol/l Ca 2+ needs to be removed Na(OH) + CO 2 HCO 3- + Na + Na(OH) + Ca 2+ + HCO 3- CaCO3 (s) + Na + + H 2 O 1.55 mmol/l caustic soda is needed 2 nd Phase max kg/h NaOH Na(OH), gives a fine water quality Easy to dose 3 th Phase max 58,19 kg/h NaOH June 1,

15 Dimension Softening, 2 nd Phase Min flow-max flow : 60 m/h m/h Enough capacity needed when one reactor breaks down Partial flow for softening at Lekkerkerk: 4.0 M m³/year m 3 /h Min: 0.85 * m3/h = m 3 /h Max: 1.45 * m3/h = m 3 /h A total =(662.1 m 3 /h) / (70 m/h) = 9.46 m 2 3 reactors, A reactor =3.15 m 2 When Q min = m 3 /h 2 reactors with a velocity: 61.5 m/h When Q gem = m 3 /h 2 reactors with a velocity: 72.3 m/h When 1 reactor breaks down 2 reactors with a velocity: 105 m/h L e = 7.26 m June 1,

16 Dimension Softening, 3 th Phase Min flow-max flow : 60 m/h m/h Enough capacity needed when one reactor breaks down Partial flow for softening at Lekkerkerk: 5.7 M m³/year m3/h Min: 0.85 * m3/h = m3/h Max: 1.45 * m3/h = m3/h 1 extra pellet reactor of equal dimensions A total =(938.8 m 3 /h) / (75 m/h) = m 2 4 reactors, A reactor =3.15 m 2 When Q min = m 3 /h 2 reactors with a velocity: 87.3 m/h When Q gem = m 3 /h 3 reactors with a velocity: 68.5 m/h When 1 reactor breaks down 2 reactors with a velocity: 99.3 m/h L e = 6.86 m June 1,

17 Construction, 2 nd Phase E total =1/3*E /3*E 0.3 E 1.0 =1.0 E E 0.3 =3.3 total =2.53 L total =L in + L e + L uit L e = L 0 * E total L e =(2 m)*2.53= 5.06 m L in =1.5 m L uit =2.60 m L total =9.16 m E 0.3 d uit d uit = 2.65 m d cil = 2.00 m L uit E 1.0 L e d cil June 1,

18 Construction, 3 th Phase E total =1/3*E /3*E 0.3 E 1.0 =1.1 E E 0.3 =3.5 total =2.7 L total =L in + L e + L uit L e = L 0 * E total L e =(2 m)*2.7= 5.40 m L in =1.5 m L uit =2.92 m L total =9.82 m E 0.3 d uit d uit = 2.73 m d cil = 2.00 m L uit E 1.0 L e d cil June 1,

19 Questions? June 1,

DRINKING WATER - LAB EXPERIMENTS LAB EXPERIMENTS. Softening

DRINKING WATER - LAB EXPERIMENTS LAB EXPERIMENTS Softening softening lab experiments Framework This module explains the lab experiment on softening. Contents This module has the following contents: 1.