Long-term underground arsenic removal - SAR using FERMANOX®

#Arsenic #groundwater #wells #iron #oxygen
FERMANOX® pilot plant in the Mekong Delta, Vietnam incl. feed pump and pressure vessel (red), SAR tank (black) with control unit and granulate filter (blue) for pre-removal of manganese.
FERMANOX® pilot plant in the Mekong Delta, Vietnam. Copyright: Tan Vu Luong (2019).

Long-term and robust treatment system for treating reduced groundwater containing iron and arsenic by adding atmospheric oxygen: The easy-to-use FERMANOX® UEE/SAR removes arsenic from groundwater without generating toxic waste or waste products.

The FERMANOX® UEE/SAR for subsurface de-arsenization was successfully tested in the Mekong Delta as part of the WaKap joint project (www.wakap.de). 
The treatment of arsenic-containing groundwater is carried out as an oxidative in-situ treatment by regular infiltration of oxygen-enriched water into the aquifer. The oxygen is simply taken from the ambient air, and only electrical power is required as an operating medium.
After the first pilot phase in Vietnam, an arsenic elimination of > 97 % (from 80 µg/l to < WHO drinking water limit of 10 µg/l) could be achieved - besides an almost complete iron removal. 
After about 2.5 years of operation under real conditions, the permanent arsenic removal could be confirmed by SAR to concentrations in the drinking water range.

The FERMANOX® prototype UEE/SAR is designed for easy use and suitable for export. On site, any tank can be connected and the feed pump (supplied or on site) can be docked. The design is for alternate operation with 2 delivery wells. The infiltration ratio (infiltration to extraction volume) is determined individually for each application from the raw water quality at the site. Therefore, depending on the raw water quality, the prototype has a treatment capacity of approx. 40 to 400 m³/day.

Water resource: Groundwater
Type of product:
  • Technologies & processes
TRL: 7
    TRL (Technology Readiness Level)
  • TRL 1 - Basic principles observed
  • TRL 2 - Technology concept formulated
  • TRL 3 - Experimental proof of concept
  • TRL 4 - Technology validated in lab
  • TRL 5 - Technology validated in relevant environment (industrially relevant environment in the case of key enabling technologies)
  • TRL 6 - Technology demonstrated in relevant environment (industrially relevant environment in the case of key enabling technologies)
  • TRL 7 - System prototype demonstration in operational environment
  • TRL 8 - System complete and qualified
  • TRL 9 - Actual system proven in operational environment (competitive manufacturing in the case of key enabling technologies; or in space)
Application sector: Agriculture, Cities and municipalities, Industry, Water resource management
Funding measure: WavE
Project: WaKap

Contact and partners

Logo FERMANOX® Wasseraufbereitung Fa. Winkelnkemper GmbH
  • FERMANOX® Wasseraufbereitung Fa. Winkelnkemper GmbH,
  • Krummer Weg 3,
  • 59329 Wadersloh
Dr. Ing. Torsten Winkelnkemper

FERMANOX® Wasseraufbereitung Fa. Winkelnkemper GmbH,
Hochschule Karlsruhe – Technik und Wirtschaft, Center of Applied Research (CAR)
Fraunhofer ISI – Institut für System- und Innovationsforschung
Karl Spiegl GmbH & Co KG
Vietnamese-German University (VGU)

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