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American Water Enterprises
3100 South Lewis Blvd, RR6
Sioux City, IA 51106
Phone - 712-279-6916
Fax - 712-279-6191
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Odor Control
In 2006, American Water teamed up with CDM to evaluate the current Collection
System Odor Control strategy. A three-phase process was completed as a part of
this contract deliverable.
Phase I looked at the Formation and Release of odor-causing Hydrogen Sulfide
(H2S), in the Sioux City collection system. Baseline data was collected from the
sanitary sewer system as well as from each of the contributing industries and
each of the odor causing pollutants and concentrations were identified along the
way. Analysis by CDM of the Liquid-Phase Treatment was done by dosing of
chemicals or microbial products for control of odor. These products were applied
in the Sioux City collection system and evaluated as to the pros and cons of
each type of treatment. Phase I also included a review of odor complaints and
priorities were set. The information was compiled in a report and presented to
American Water and the City.
During this phase, CDM identified the “hot spots” with H2S levels exceeding
50ppm as critical control points, collected flow data through each of the
control points, sulfide was quantified and mapped, and various means of meeting
the Odor Guarantee were explored. CDM then sent out Request for Vendor Proposals
(RFP) to each of the major Odor Control Vendors.
Each vendor participated in evaluating the effectiveness of their technology
with flow at each of the critical control points identified in the system. Based
on the results, the vendors were able to provide estimates of the required
dosages and associated costs to treat the system as required by the RFP. The
City allowed three vendors to participate in a full-scale trial of the Riverside
Interceptor.
American Water and CDM identified three vendors that would participate, which
included, Siemens/US Peroxide, Martin Marietta, and In-Pipe Technologies. Each
vendor was given a period to prove their technology in a full-scale trial of the
Riverside Interceptor. Each vendor had to demonstrate ability to meet specific
goals, including average headspace hydrogen sulfide (H2S) concentration below
5ppm and average dissolved sulfide concentration below 0.5mg/l.
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