Environmental Engineering Reference
In-Depth Information
TABLE 13.5
Use of CNT Electrode Technology to Treat Canal
Water in California
After Treatment
(mg/L)
Calcium 100 4.1
Magnesium 20 0.76
Sodium 70 10
Barium 0.12 0.016
Copper 0.009 0.001
Fluoride 0.5 <0.1
Nitrate/nitrite 13 <0.5
Sulfate 90 <1
Source:
Power Point table in presentation by R.S.
Miller, “Carbon Nanotubes: A Fundamental
Shift in Filtration”, presentation at 2009 WATER
EXECUTIVE Forum, Philadelphia, March
30-31, 2009.
Original
(mg/L)
Contaminant
13.11.5 Product Development
L. Farmen [25] reported on her irm's product development strategy for its nano-coated il-
ter media treatment product, NMX™. This product uses low-cost ligand coatings and has
been shown to be capable of binding targeted metal contaminants. Proposed applications
for the technology include mining and high-metal-containing wastewater, distributed
puriication systems, industrial and recycle process water, municipal water treatment, and
home point-of-use or -entry. Expected beneits from the technology are as follows:
• Recovery and recycling of heavy metals to meet drinking water standards
• High adsorbent capacity
• In-place regeneration capability up to seven times to enhance capacity dramati-
cally and reduce cost
• Ability to “functionalize” other substrates to enable metal removal
The company's initial focus is on removal of selenium, lead, copper, and cobalt. Work
under way emphasizes development of a low-cost process for combining chitosan and
selected ligands for industrial, mining waste, and battery recyclers. Development work is
also examining the development of a low-cost electrodeionizer to concentrate ionic impu-
rities in water.
13.12 Closing Thought
In this chapter, we have examined water treatment in several important areas: power gen-
eration, pharmaceuticals, semiconductors, and desalination. Nanotechnology offers great
potential to improve future water treatment methods and when implemented will create
