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Eco-India arsenic drinking water treatment

The treatment of tube-well water to remove arsenic, and the provision of clean drinking water from surface water.
by howard dryden on 24 January 2014

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Transcript of Eco-India arsenic drinking water treatment

Eco India Team
About the project
The village
Surface water
Consortium Mission Statement
The overall aim of ECO-India is to design and develop innovative cost-effective solutions for community- based water- and wastewater- treatment systems. These systems will be deployed at pilot sites in arsenic-affected water-stressed regions in India. The two consortia, Indian (DST) and European (FP7), will establish pilot schemes for:

• Catchment area and reservoir management
• Surface water supply schemes
• Arsenic removal (including monitoring using UFZ’s field-tested Arsolux arsenic sensor)
• Disinfection treatment for potable water based on Trustwater’s CE-certified mixed-oxidant generation systems.
• Online monitoring of water quality
• Water distribution network, together with online/offline water quality monitoring programmes
• Sewerage and wastewater treatment.
In addition, prototype energy-efficient modules for water deionisation and heavy metal removal will be developed.
A feasibility study will be performed to assess the potential for energy harvesting from sludge.
Pond construction
Dryden Aqua have developed sustainable water treatment system using AFM for;

Surface water treatment
safe sterile water from almost any source

remove more than 90% of arsenic, ferric and flouride
The project will compare roughing filters with slow bed sand filters against AFM for both surface water and tube-well water

50% of the water treatment will be by AFM integrated system, for both surface water and tube-well water supply

AFM will run on the same water supply and in parallel with the slow bed sand filters for both surface water and tube-well schemes.

Life Cycle cost of both systems to be determined

Arsenic sludge disposal routes to be established, possible route... make into clay bricks
The Dryden Aqua system is;

last for 20+ years
low running costs
simple to maintain
no chemicals ( except chlorine)
DST expert panel
Travel to the village
Thge village is surrounded by very fertile agricultural land
cow fuel on a stick
coolest guy in the village
Pond takes surface run-off,
volume 6700 m3
An algal bloom has developed,
the aeration system will provide bio-remediation
and improve water quality
One of the tubewell water supplies to the village, arsenic concentration over 200 ug/hr
Eco India Team and experts from DST
(department of Science and Technology of India)
AFM, Active Filter Media, replaces the sand in all sand filters, AFM can be
manufactured for specific applications, Arsenic control AFM has a higher catalytic capacity.
AFM production facility

30,000 tonnes per year capacity
Activated AFM for drinking water and specialist wastewater treatment
high surface area
high -ve electrical charge Zeta Potential
DGFM dryden aqua crushed glass media, for low end applications
The provision of clean drinking water from;
Arsenic contaminated tube-wells,
and surface water in India

AFM production facility
Dryden Aqua Mission Statement
The further development of AFM active filter media as a water filtration media to replace sand and other types of filter media such as activated carbon or green sand
Research to refine & develop the surface nano-structure of AFM to provide a sustainable alternative to membrane filtration.
The development of an integrated low cost sustainable drinking water treatment system
Better than 90% removal of arsenic, ferric and flouride for tube-wells
The provision of safe drinking water from surface water sources
The elimination of chemical toxicity and biological disease related to drinking water, in India and everywhere where the technology is applicable
The provision of training and knowledge transfer from Scotland
Dryden Aqua Water Treatment Technology
by Marine Biologists
Dryden Aqua on location in the Seychelles.

Ecological impact of waste-water discharges on delicate marine ecosystems
The Village project team
Bricks manufactured from clay may be used to fix the arsenic sludge
drinking water
surface drinking water
tube wells
Bioremediation, using aeration in the lake

followed by

pH correction with Magphlow
mechanical coagulation & flocculation
AFM filtration / adsorption
disinfection / oxidation
pH correction using MagPhlow to 7.5-8.0
Aeration to raise redox to > 100 mv
ferric injection FeCl3 if required
ZPM to rainse orp without chemicals
AFM filtration
Chlorination, electron abstraction
System Specifications
reduction of arsenic <10 ug/l
ferric reduction < 50 ug/l
suspended solids < 1 mg/l
turbidity < 0.1 ntu
flouride reduction ?
pH correcton pH 7.5 - 8.0
redox potential >100
20ft containerised system
1.2m diam DIN standard pressure filter, 1.4m bed depth
fully automatic system
power demand, aeration 250 watts
power demand AFM filter, 250 watts
24 hour inverter battery back-up, 12 kw
The system never stops, As is maintained in oxidised co-precipitate 5 valency state.
Back-wash water processing disposal needs to be established.
back-wash water, send to clarifier
decant, discharge supernatant,
remove sludge for safe disposal
0.1 to 5m3/hr
system provided by Eco-India partners
electro chlortination
on-line instrumentation,
Dr.Howard Dryden
Sumit Ganguly, Managing Director, Super Technicians (ST),
Manisha Banik, Associate Civil Engineer, adelphi
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