Case Study: Herreruela & Carcaboso – Cáceres

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

Project ID:

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.

Herreruela Parameter Existing Values Required Value
Turbidity (NTU) 5 < 1
Arsenic (ug/l) 45 < 50
Iron (mg/l) 4.48 < 0.2
Carcaboso Parameter Existing Values Required Value
Turbidity (NTU) 5 < 1
Arsenic (ug/l) 11 < 10
Iron (mg/l) 2.3 < 0.2

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.

Before Treatment: Iron = 4484 ug/l

After Treatment: Iron = 139 ug/l

Before Treatment: Arsenic = 11.0 ug/l

After Treatment: Arsenic = <3 ug/l


Results:

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

Results:

Herreruela 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

Dryden Aqua’s Deliverables: