PROJECT C-1
Sewerage Treatment Projects
Sewage Pump Station, Abu Dhabi, United Arab Emirates
PROBLEM:
Sewer treatment: noxious odor in a residential area; corrosion control
The summer climate in Abu Dhabi is severe, with daytime temperatures
consistently above 100°F. Odors emanating from sewer manways
create a public health nuisance. A sewage pump station, PS2/12,
receives effluent from a slaughterhouse. The effluent is high in
sulfides and creates noxious odors in a residential area. Municipal
engineers had been working on this problem for many years.
SOLUTION:
Mist MicroSorb®OW into sewer manway; use MicroSorb®OW and MicroSorb®SC
MicroSorb® OW and MicroSorb® SC were
selected for testing in order to determine if MicroSorb products would
abate the odor problem. MicroSorb microbes are grown in seawater with
ammonia and crude oil as energy sources. MicroSorb® OW
provides substantial quantities of oxygen and nitrogen to treated
wastewater. On November 21, 1999 two tests were conducted. The first
test involved treating noxious odors emanating from the sewer manway
receiving the PS2/12 effluent. MicroSorb® OW was misted
into the manway using a hand-held agricultural sprayer; odors were
instantly eliminated. The second test involved sampling eight liters
of wastewater collected from the sewer manway. The samples were taken
to the Mafraq Wastewater Treatment Works Lab. A solution of 0.3%
MicroSorb® OW with a few grams of
MicroSorb® SC was selected as the optimum concentration
to eliminate soluble sulfides. Soluble sulfides decreased from 2.4mg/l
to non-detect. The pH increased from 7.2 to 8.6. On January 25, 2000,
another round of testing was performed. Again wastewater was
retrieved from PS2/12 and treated to a concentration of 0.3%
MicroSorb® OW with a few grams of
MicroSorb® SC. Soluble sulfides were reduced from 6.0
mg/l to 1.4 mg/l. The pH increased from 6.7 to 7.0. The daily flow
from PS2/12 was 204,000 gallons/day. The treatment works daily flow
was 61,930,000 gallons/day. The discharge of PS2/12 represented 0.33%
of the total flow to the treatment works. Additional analysis was
conducted in order to determine the effect of the treatment on the
total sewage flow; 16.5ml of the treated sample from PS2/12 was added
to 50 liters of raw sewage taken from the treatment plant
influent. There was no pH change; however, the soluble sulfides in the
sewage plant influent sample decreased from 15.2mg/l to 9.4mg/l.
RESULTS:
Testing proves that the addition of MicroSorb® OW and
MicroSorb® SC to sewage eliminated odors and raised the
pH, thus reducing the potential for corrosion. (See following
pages.)
Download the MicroSorb Brochure