A DIVISION OF
PREMIER TECHNICAL RESOURCES — MUNICIPAL GRADE TREATMENT SYSTEMS
FOR ODOR, CORROSION, FOG, BIOLOGICAL, AND BIOSOLIDS PROCESSING
FORCE MAIN GAS BINDING
Problem Statement:
Pumping and conveying of wastewater from end user through the collection system to wastewater
treatment plants can result in negative conditions including gas binding, blockages associated
with fats, oils and greases (FOG), and system corrosion. There may be other contributing
conditions, but these factors appear to be the greatest contributors to O&M costs including energy
consumption, maintenance costs, and Sanitary Sewer Overflows (SSOs).
Background:
A collection system line is a unique conveyance system. The transfer of wastewater can
result in the release of gases such as O2 – Oxygen, CO2 – Carbon Dioxide, N2 – Nitrogen Gas,
H2S – Hydrogen Sulfide, CH4 – Methane, VOCs – Volatile Organic Compounds, and VOSCs –
Volatile Organic Sulfur Compounds among others. Some of these gases are drawn into the system
through pumping and ventilation, while others are generated within the system either chemically
or biologically. These gases can result in the development of gas binding in the system, especially
with the utilization of calcium nitrate, as well as contribute to odors and corrosion.
Force Main With Calcium Nitrate (CaNO3) Liquid Phase Treatment
Force Main With Calcium Nitrate (CaNO3) Liquid Phase Treatment
CALCIUM
NITRATE
LOW pH (RED)
HIGHLY CORROSIVE
N2 gas formed in wet well can cause
suction inefficiency at pump intake
FOG exacerbated by biological
conditioning caused by nitrates
CaNO3
FLOATING
ORGANIC
MATTER &
GREASE
S UR E
EA
INCR
CO2 CO 2
O2 N2
NO3
N2
S
G PRE
N
INDIN
N2 2
AS B
SED G
N2
MILE 1
O2
NO3
SO4 NO3 O2 NO3
PUMPING STATION
Choosing
THIOGUARD® will:
in pump station power costs
by choosing THIOGUARD® as
your odor, FOG and corrosion
control process in your
collection system.
Aerobic
Bacteria
Dissolved O2
used first
producing CO2
N2
CO 2
H2SO4
H2S N2
CO H2S N2
NO
2
ARV
INCREASED TRAPPED GAS
H2S
H2S
H2 S
H2S H2S
VOSC
VOC
H2S H2S H S
2
H2S
CH4
H2S H2S H2S CH4 H2S
H2SO4
H2SO4
H2S
H2S
VFAs (Volatile Fatty Acids) are eliminated with calcium nitrate addition that are needed by PAOs
(phosphorus accumulating organisms) for phosphate removal at the wastewater treatment plant.
MILE 2
MILE 3
MILE 4
MILE 5
Facultative Bacteria &
Sulfate Reducing Bacteria
1. Large amounts
of NO3 available
2. O from NO3 used
by bacteria
reducing NO3
to N2 & NO
MILE 6
Acid Producers & Methanogens
Bacteria use O from SO4 producing H2S gas
At pH7 >50% of H2S can be liberated into the gas phase
■Decrease maintenance
■Decrease operating
power costs
■Decrease FOG related
SSOs and ARV
malfunction
■Improve efficiency due
to reduced discharge
pressure in manifolded
force mains
■S ave money
THIOGUARD® VS NITRATE
500,000 GPD Pump Station Monthly Power Cost
$5,000
$4,500
$4,000
$24,000 / yr.
Save up to 50% per year
VOSC VOC
H2S N2 H2S
N2
CO2
$3,500
$3,000
$2,500
$2,000
$1,500
Baseline
Nitrate
Thioguard
Solution: THIOGUARD® can overcome these issues by reducing or eliminating gas emissions from wastewater, dissolving FOG blankets and
reducing corrosion to pumps and infrastructure. No other product can match Thioguard's ability to neutralize both collection system surface acid and
wastewater acid over short and long distances to and through the wastewater treatment plant.
Force Main With THIOGUARD Treatment
®
Force Main With THIOGUARD® Treatment
Less CO2 is produced with THIOGUARD ,
CO2
as CO2 gas is held in solution similarly to H2S
HS
®
2
THIOGUARD®
THIOGUARD INCREASES SURFACE
pH TO NEUTRAL pH (WHITE)
PREVENTING INFRASTRUCTURE
CORROSION
®
THIOGUARD
MINIMAL
GREASE IN
WETWELL
®
CO2
p
CO 2
CO 2
MILE 1
O2 SO4
pH 8.2
CO 2
H 8.2
O2
O2
.2
pH 8
Mg(HS-)2
ARV
H2 S
MILE 3
pH 8
.2 M
g(HS )2
MILE 4
Dissolved O2
used first
producing CO2
REDUCED
VOSC
CO2
H2S
H2S pH 8.2 Mg(HS )2
pH 8.2
MILE 6
Acid Producers & Methanogens
Sulfate reducing bacterial activity
THIOGUARD has
greatly reduced producing very little
long range
H2S gas. Liquid/gas phase equilibrium
buffering capacity
shifted to keep HS- in solution
to neutralize
acid attack on
HS- Combines with Mg+ to produce
infrastructure
a soluble magnesium complex
No NO3 present
CO2
MILE 5
Facultative Bacteria &
Sulfate Reducing Bacteria
SO4
H2S
LESS GAS PRODUCED
H 2S
MILE 2
Aerobic
Bacteria
PUMPING STATION
INCREASED SURFACE pH = LESS CORROSION
REDUCED GREASE
PLUGGING
Anaerobic
activity retarded
by increased pH
Force Main With No Liquid Phase Treatment
Force Main with No Liquid Phase Treatment
GREASE ACCUMULATION
PLUGGING ARVs
LOW pH (RED)
HIGHLY CORROSIVE
CO2 CO 2
FLOATING
GREASE
CO 2
MILE 1
O2
O2
O2
PUMPING STATION
THIOGUARD.COM
877.851.5884
Premier Magnesia LLC
300 Barr Harbor Drive, Suite 250
West Conshohocken, PA 19548
OWNED, MINED AND
PRODUCED IN THE USA
ISO 9002:1994
Aerobic
Bacteria
Dissolved O2
used first
producing CO2
CO 2
CO 2
H 2S
H 2S
H 2S
MILE 2
H2S
H2S
CO2
VOC
VOSC
H2S
H 2S
TRAPPED GAS
H2 S
H2 S
ARV
MILE 3
CO2
MILE 4
Facultative Bacteria &
Sulfate Reducing Bacteria
1. Little or no
NOx present
2. Begin using
other forms of
combined O
H2 S
H2S VOC
H2S
VOSC
CO2 H2S CH4 H2S CH4
MILE 5
H2S
CO2
CH4
MILE 6
Acid Producers & Methanogens
Bacteria use O from SO 4 producing H2S gas
At pH7 >50% of H2S can be liberated into the gas phase
Thiobacillus
Bacteria convert
H2S into
Sulfuric Acid
Corporate HQ
Peter Ahl
610.420.7500
NE Region
Andrew Rupprecht
610.585.4162
SC Region
Mary Evans
903.245.6316
SE Region
James Elsey
770.365.2068
[email protected]
[email protected]
[email protected]
[email protected]
Florida Region
David Pickard
813.928.2793
Western Region
Matt Thorne
714.998.8800
Senior Business Unit, Technical Manager
Matt Madolora
512.657.1835
[email protected]
[email protected]
[email protected]