Supply of drinking watertreatment system to the cities of Herreruela and Carcaboso in Spain

Company : Herreruela & Carcaboso
Location : Spain
Year : 2011-2012
Description : Supply of drinking water treatment system to the cities of Herreruela and Carcaboso in the province of Caceres, Spain
Goal : Reduce arsenic and iron levels
Capacity : Herreruela: 200 m3/day
Carcaboso : 400 m3/day
Water Source : Tube wells

The Problems :

  • The drinking water contained high levels of Arsenic and Iron above drinking water limits standards.

Technical Solution :

The following processes were carried out:

  • Aeration and Oxidation (detention time of 30-60 minutes) using air diffusers in order to blow off VOC’s and raise the redox potential to >100 mv.
  • MagpHlow dozing into the aeration tank in order to raise pH levels to 8.0-8.3.
  • Coagulant dozing of APF® into the aeration tank.
  • AFM® filtration.
  • Chlorine dozing.

Results : Herreruela

Herreruela Parameter

Required Value

Before treatment

After treatment

Turbidity (NTU)

< 1

5

< 0.5

Arsenic (ug/l)

< 10

45

< 10

Iron (mg/l)

< 0.2

4.48

0.14

Before Treatment: Iron = 4484 ug/l

After Treatment: Iron = 139 ug/l

Results : Carcaboso

Carcaboso Parameter

Required Value

Before treatment

After treatment

Turbidity (NTU)

< 1

5

< 0.3

Arsenic (ug/l)

< 10

11

< 3

Iron (mg/l)

< 0.2

2.3

< 0.12

Before Treatment: Arsenic = 11.0 ug/l

After Treatment: Arsenic = <3 ug/l


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