Environmental Engineering Reference
In-Depth Information
11. Implement the mitigation strategy.
12. Monitor arsenic concentration at each entry point to the distribution system
to ensure that the arsenic levels are now in compliance with the Arsenic Rule
assumes centralized treatment approach, not point-of-use treatment.
The Arsenic Treatment Technology Evaluation Handbook for Small Systems contains Table
ES-1, which provides a summary of information about the different alternatives for arsenic
mitigation found in this handbook. Please note that systems are not limited to using these
technologies.
9.3 Success Story 12
Titanium dioxide patent licensed from the Stevens Institute, known as MetSorb™, formed
the company HydroGlobe. The award-winning patent, titled “Methods of Preparing a
Surface-Activated Titanium Oxide Product and of Using Same in Water Treatment Process”
is known as MetSorb, a highly effective, low-cost absorbent for reduction of arsenic and a
wide variety of heavy metals from groundwater and surface water. The invention details
a method for producing a surface-activated crystalline titanium oxide product having a
high adsorptive capacity and high rate of adsorption with respect to dissolved contami-
nants. The invention further includes steps of preparing a titanium oxide precipitate from
a mixture comprising a hydrolysable titanium compound.
The success part of this story is not only did this team achieve good adsorption (50,000
bed volumes [BVs]) at a relatively low cost of implementation, the Stevens Institute assisted
with forming HydroGlobe and getting this patent commercially viable (http://www.stevens
.edu/research/faculty_news.php?news_events_id=74).
Some of the new technologies that are in the process of commercializing are as follows:
• A nanocomposite material funded to Inframat ® /MetaMateria under a US Air
Force SBIR where the novel intellectual property is a nanoporous material that
has an oxidizer bonded to the substrate (MnO 2 -Fe 2 O 3 ) that can convert As 3+ to
As 5+ for full adsorption. A recent laboratory study on the oxidation of As(III) to
As(V) found that solid-phase MnO 2 is preferred over chlorine, ozone, and per-
manganate because the latter requires stoichiometric dosing in proportion to the
reducing agents, such as As 3+ , Fe 2+ , Mn 2+ , and sulide S 2− present in raw water.
Hazardous chemicals handling and overdosing problems can be avoided when
solid-phase MnO 2 media is used. The patents are US 7,655,148; US 8,216,543; China
200680038191.4; Taiwan I 359115: H. Chen, M. Wang, T.D. Xiao, D.A. Clifford.
• Crystal Clear Technologies developed a functionalized inorganic substrate that
bonds both forms of arsenic and passes the Toxicity Characterization Leaching
Procedure (TCLP) test. Their layering patent will allow for multiple layers of metal
to be bonded on top of each other separated by a bifunctional ligand. Total arsenic
loading with eight layers of metal subsequently bonded on top of one another can
reach several percent. 13
http://groups.engr.oregonstate.edu/ewb/wp-content/uploads/crystal-clear-tech
-ppt.pdf.
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