INDUSTRIAL BOILERS
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INDUSTRIAL BOILERS. CUSTOMIZED ENVIRONMENTAL TRAINING. WELCOME. INSTRUCTOR. Insert Instructor Name Here. OBJECTIVES. Define Industrial Boiler Size. Discuss How Nitrogen Oxide (NOx) is Formed. Discuss Factors Affecting NOx. Discuss Boiler Operational Factors. Discuss NOx Controls.

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Welcome

INDUSTRIAL BOILERS

CUSTOMIZED ENVIRONMENTAL

TRAINING

WELCOME


Welcome

INSTRUCTOR

Insert Instructor Name Here


Welcome

OBJECTIVES

  • Define Industrial Boiler Size.

  • Discuss How Nitrogen Oxide (NOx) is Formed.

  • Discuss Factors Affecting NOx.

  • Discuss Boiler Operational Factors.

  • Discuss NOx Controls.

  • Discuss Other Environmental Considerations Concerning Boilers.

  • Discuss Burning Hazardous Waste in Boilers.

  • Discuss Boiler Safety Precautions.

  • Outline Safety and Environmental Inspection Items.

  • Discuss Monitoring Requirements.

  • Discuss Use of Contractors.


Welcome

GOALS

  • Be Familiar With Records to Maintain.

  • Understand What Is Considered an Industrial Boiler.

  • Understand How Nitrogen Oxide (NOx) is Formed.

  • Understand the Factors Affecting NOx.

  • Be Familiar With Boiler Operational Factors.

  • Understand the Different NOx Controls.

  • Be Familiar With Other Environmental Considerations Concerning Boilers.

  • Understand the Requirements for Burning Hazardous Wastes.

  • Be Familiar With Boiler Safety Precautions.

  • Be Familiar With Safety and Environmental Inspection Items.

  • Be Familiar With Monitoring Requirements.


Welcome

BACKGROUND

  • In 1999, there were 5,489,423 tons of Nitrogen Oxide (NOx) emitted into the atmosphere by industrial boilers. NOx is instrumental in smog and acid rain formation

  • On November 3, 1999, the Justice Department filed seven lawsuits against electric utilities in the Midwest and South charging them with violations of their NOx boiler emissions

  • 43% of all boilers are subject to Nitrogen Oxide (NOx) emission limits


Welcome

LEARNERS

  • Supervisors

  • Facility Engineers

  • Maintenance Personnel

  • Department Managers

  • Building Occupants

  • Process Specialists

  • Environmental and Safety Committees


Welcome

OVERVIEW

The goal of this course is to provide supervisors with the tools needed to properly manage industrial boilers. It recommends practical, actions that can be carried out by facility management, maintenance personnel and building occupants. The course will help you to integrate good industrial boiler management activities into your existing organization and identify which of your staff have the necessary skills to carry out those activities.


Welcome

WHAT THIS COURSE DOES NOT DO

The course is not intended to provide information to repair industrials boilers or to install or repair monitoring equipment or control devices. These specialties required training beyond the intended scope of this course. Where this expertise is needed, outside assistance should be solicited.


Clean air act

Clean Air Act Amendments (CAAA) of 1990, amended Title I of the Clean Air Act (CAA) to address ozone nonattainment areas

Stationary sources that emit oxides of nitrogen (NOx) which emit or have the potential to emit 25 tons per year or more of such air pollutant

CLEAN AIR ACT


Applicable regulations

40 CFR 63 – National Emission Standards For Hazardous Air Pollutants For Source Categories

40 CFR266-- Subpart H--Hazardous Waste Burned in Boilers and Industrial Furnaces

40 CFR 76 – Acid Rain Nitrogen Oxides Emission Reduction Program

APPLICABLE REGULATIONS


Industrial boilers

Industrial boilers have been identified as a category that emits more than 25 tons of oxides of nitrogen (NOx) per year

Boilers include steam and hot water generators with heat input capacities from 0.4 to 1,500 MMBtu/hr (0.11 to 440 MWt).

Primary fuels include coal, oil, and natural gas

Other fuels include a variety of industrial, municipal, and agricultural waste fuels

INDUSTRIAL BOILERS


Boiler sizes

Industrial boilers generally have heat input capacities ranging from 10 to 250 MMBtu/hr (2.9 to 73 MWt). The leading user industries of industrial boilers, ranked by aggregate steaming capacity, are the paper products, chemical, food, and the petroleum industries

Those industrial boilers with heat input greater than 250 MMBtu/hr (73 MWt) are generally similar to utility boilers

Boilers with heat input capacities less than 10 MMBtu/hr (2.9 MWt) are generally classified as commercial/institutional units

BOILER SIZES


How nox is formed

NOx is a high-temperature byproduct of the combustion of fuels with air

NOx formation in flames has two principal sources

1. Thermal NOx is that fraction of total NOx that results from the high-temperature reaction between the nitrogen and oxygen in the combustion air

The rate of thermal Nox formation varies exponentially with peak combustion temperature and oxygen concentration

When low-nitrogen fuels such as natural gas, higher grade fuel oils, and some nonfossil fuels are used, nearly all the NOx generated is thermal NOx

HOW NOx IS FORMED


How nox is formed1

2. Fuel NOx is that fraction of total NOx that results from the conversion of organic-bound nitrogen in the fuel to NOx

When coal, low-grade fuel oils, and some organic wastes are burned, fuel NOx generally becomes more of a factor because of the higher levels of fuel-bound nitrogen available

HOW NOx IS FORMED


Parameters affecting nox

Principal among these are:

The heat release rates and absorption profiles in the furnace

Fuel feed mechanisms

Combustion air distribution

Boiler operating loads

For example, steam pressure and temperature requirements may mandate a certain heat release rate and heat absorption profile in the furnace which changes with the load of the boiler.

PARAMETERS AFFECTING NOx


Parameters affecting nox1

Solid fuels can be introduced into the furnace in several ways, each influencing the rate of mixing with combustion air and the peak combustion temperature

These parameters are very unit specific and vary according to the design type and application of each individual boiler

NOx emissions from boilers tend to be highly variable.

PARAMETERS AFFECTING NOx


Factors affecting nox

The ranges in baseline NOx emissions for boilers are due to several factors including:

Boiler design

Fuel type

Boiler operation

These factors usually influence baseline NOx in combination with each other, and often to different degrees depending on the particular boiler unit.

FACTORS AFFECTING NOx


Boiler design type

The firing type of the boiler influences the overall NOx emission level

Even within a particular type of boiler, other design details may influence baseline NOx

BOILER DESIGN TYPE


Boiler design type1

For Pulverized Coal:

Boiler Type Average lb of NOx / MM Btu

Tangential 0.61

Wall-Fired 0.69

Cyclone 1.12

Low NOx Burners, Natural Gas Reburning, and Low NOx Burners with Staged Combustion Air are effective in controlling NOx in these units

BOILER DESIGN TYPE


Boiler design type2

For Coal:

Boiler Type Average lb of NOx / MM Btu

Overfeed Stoker 0.29

Circulating Fluidized Bed Combustion (FBC) 0.31

Bubbling FBC 0.32

Underfeed Stoker 0.39

Spreader Stoker 0.53

Air staging in coal-fired FBC boilers is very effective in reducing NOx from these units

BOILER DESIGN TYPE


Boiler design type3

For Residual Oil:

Boiler Type Average lb of NOx / MM Btu

Firetube 0.31

Watertube (10-100 MM Btu/hr) 0.36

Watertube (>100 MM Btu/hr) 0.38

Low NOx Burners, Flue Gas Recirculation, and Staged Combustion Air have shown some reduction in NOx for residual oil

BOILER DESIGN TYPE


Boiler design type4

For Distillate Oil:

Boiler Type Average lb of NOx / MM Btu

Watertube (10-100 MM Btu/hr) 0.13

Firetube 0.17

Watertube (>100 MM Btu/hr) 0.21

Low NOx Burners, Flue Gas Recirculation, and the combination of Low NOx Burners with Flue Gas Recirculation are used to control Distillate Oil NOx

BOILER DESIGN TYPE


Boiler design type5

For Natural Gas:

Boiler Type Average lb of NOx / MM Btu

Firetube 0.10

Thermally Enhanced Oil Recovery

(TEOR) Steam Generator 0.12

Watertube (10-100 MM Btu/hr) 0.14

Watertube (>100 MM Btu/hr) 0.26

Low NOx Burners, Flue Gas Recirculation, and Staged Combustion Air and combinations of these methods are all effective in reducing NOx for natural gas

BOILER DESIGN TYPE


Fuel characteristics

Boiler baseline NOx emissions are highly influenced by the properties of the fuels burned

Among each of fuel types, emissions will depend on highly variable factors such as fuel grade and fuel source

In particular, studies have shown that fuel nitrogen content — and for coal the oxygen content and the ratio of fixed carbon to volatile matter — are key factors influencing NOx formation

FUEL CHARACTERISTICS


Fuel characteristics1

Nitrogen Content of Fuels

The following table gives ranges of nitrogen content for different fuels:

Fuel% by Weight

Coal.8 – 3.5

Residual Oil.36

Distillate Oil<0.01

Natural Gas0 – 12.9

FUEL CHARACTERISTICS


Fuel characteristics2

Sulfur

Sulfur can combine with oxygen and water to form Sulfuric Acid, H2SO4

Fuel% of Sulfur

Coal1-4

Residual Oil1.3

Distillate Oil.72

Natural Gas<0.001

Although lower sulfur content generally means lower nitrogen, there is no apparent direct relationship between these two fuel oil parameters

FUEL CHARACTERISTICS


Fuel characteristics3

Fuel Ratio

Fuel ratio is defined as the ratio of a coal's fixed carbon to volatile matter

Under unstaged combustion conditions, lower fuel ratios (i.e. higher volatile content of the coal) correlate to higher levels of NOx, because with higher volatile content coals, greater amounts of volatile nitrogen are released in the high temperature zone of the flame where sufficient oxygen is present to form NOx

Firing coal with high volatile content and lower fixed carbon generally results in less solid carbon to be burned out in the post-flame gases, meaning that the coal can be fired at lower excess air before combustible losses became a problem

FUEL CHARACTERISTICS


Fuel characteristics4

Moisture

Moisture content plays an important role in the formation of uncombustible emissions in Municipal Solid Waste boilers

Non-combustible content of Municipal Solid Waste can range from 5 to 30 percent

Moisture content of Municipal Solid Waste can range from 5 to 50 percent

Nitrogen contents of Municipal Solid Waste can range between 0.2 and 1.0 percent

FUEL CHARACTERISTICS


Boiler heat release rate

Boiler heat release rate per furnace area is another influential variable affecting NOx formation

As heat release rate increases, so does peak furnace temperature and NOx formation

Boiler heat release rate varies primarily with:

Boiler firing type

Primary fuel burned

Operating load

Boiler heat release rate per unit volume is often related to boiler capacity

BOILER HEAT RELEASE RATE


Boiler operational factors

Chief among these operational factors are the amount of excess oxygen in the flue gases and the combustion air temperature

Excess oxygen refers to the oxygen concentration in the stack gases, and is dependent on the amount of excess air provided to the boiler for combustion

Combustion air temperature, meanwhile, is dependent on the degree of air preheat used before the air is introduced into the furnace or burner

Air preheat is usually used to increase furnace thermal efficiency

BOILER OPERATIONAL FACTORS


Boiler operational factors1

Operation on low excess oxygen or air is therefore considered a fundamental part of good combustion management of boilers

Many boilers are typically fired with excess oxygen levels which are more than adequate to assure complete combustion and a margin of safety

Units often are operated at unnecessarily high excess oxygen levels that result in unnecessarily high NOx emissions and losses in efficiency

The greater degree that the air is preheated, the higher the peak combustion temperature and the higher the thermal NOx

BOILER OPERATIONAL FACTORS


Controls

Retrofitting existing generating units with low-NOx burners is the most frequently chosen compliance control because it is an economical way to limit the formation of NOx

 Low-NOx burners control fuel and air mixing to create larger and more branched flames, reduce peak flame temperatures and lower the amount NOx formed

The improved flame structure also improves burner efficiency by reducing the amount of oxygen available in the hottest part of the flame

CONTROLS


Controls1

In principle, there are three stages in a conventional low-NOx burner:

1. Combustion - combustion occurs in a fuel-rich, oxygen-deficient zone where the NOx is formed

2. Reduction - where hydrocarbons are formed and react with the already formed NOx

3. Burnout - internal air staging completes the combustion. Additional NOx formation occurs in the third stage, but it can be minimized by an air-lean environment

Low-NOx burners can also be combined with overfire air technologies to reduce NOx further

CONTROLS


Controls2

Natural Gas Reburning

Another combustion modification technique involves the staging of fuel, rather than combustion air

By injecting a portion of the total fuel input downstream of the main combustion zone, hydrocarbon radicals created by the reburning fuel will reduce NOx emission emitted by the primary fuel

This reburning technique is best accomplished when the reburning fuel is natural gas

Application of these techniques on boilers has been limited to some municipal solid waste (MSW) and coal-fired stokers

CONTROLS


Controls3

Staged Combustion Air (SCA)

A technique that reduces flame temperature and oxygen availability by staging the amount of combustion air that is introduced in the burner zone

SCA can be accomplished by several means.

For multiple burner boiler, the most practical approach is to take certain burners out of service (BOOS) or biasing the fuel flow to selected burners to obtain a similar air staging effect

Generally, SCA is not considered viable for retrofit to packaged boiler units due to installation difficulties.

CONTROLS


Controls4

Flue Gas Recirculation (FGR)

Involves recycling a portion of the combustion gases from the stack to the boiler windbox

These low oxygen combustion products, when mixed with combustion air, lower the overall excess oxygen concentration and act as a heat sink to lower the peak flame temperature and the residence time at peak flame temperature

These effects result in reduced thermal NOx formation.

It has little effect on fuel NOx emissions

FGR is currently being used on a number of watertube and firetube boilers firing natural gas

CONTROLS


Carbon monoxide co

The CO emissions from boilers are normally near zero, with the exception of a few boilers that have poor combustion air control or burner problems

Oil-fired units were found to have the lowest baseline CO emissions than either coal- or gas-fired units

CO emissions are generally caused by poor fuel-air mixing, flame quenching, and low residence time at elevated temperatures

In some furnace designs, CO emissions can also occur because of furnace gas leaks between furnace tubes

CARBON MONOXIDE (CO)


Other air pollutants

Other air pollution emissions that are a concern when NOx controls are applied to boilers are: ammonia (NH) and nitrous oxide (NO), unburned hydrocarbon (HC), particulate matter (PM), and air toxic emissions

Ammonia and NO emissions are associated with the use of the Selective Non-Catalytic Reduction (SNCR) controls and with Selective Catalytic Reduction controls to a lesser extent. With either urea or ammonia hydroxide, unreacted ammonia emissions escape the SNCR temperature window resulting in direct emissions to the atmosphere

OTHER AIR POLLUTANTS


Other air pollutants1

Increases in HC, particulate matter (PM) and air toxic emissions are primarily of concern with the application of combustion modification controls

HC emissions do not change when NOx controls are implemented

HC emissions are the result of poor combustion conditions such as inefficient fuel-air mixing, low temperatures, and short residence time

These emissions are most often preceded by large increases in CO, soot, and unburned carbon content

By limiting CO, smoke and unburned carbon in the flyash, HC emissions are also suppressed

OTHER AIR POLLUTANTS


Other air pollutants2

Studies of industrial boilers and particulate matter (PM) reveal the following trends:

Low excess air reduced PM emissions on the order of 30 percent

Staged combustion air increased PM by 20 to 95 percent

Burner adjustments and tuning had no effect on PM

Lower CO emission levels generally achieved with these adjustments would tend to lower PM as well

Flue gas recirculation resulted in an increase in PM from oil-fired packaged boilers by 15 percent over baseline levels

OTHER AIR POLLUTANTS


Solid waste

NOx reduction techniques that have a potential impact on the disposal of solid waste are combustion controls for Pulverized Coal-fired boilers and flue gas treatment systems for all applicable boilers

Combustion controls for Pulverized Coal-fired boilers are principally Low NOx Burners. These controls can result in an increase in the carbon content of flyash that can preclude its use in cement manufacturing.

SOLID WASTE


Water use and wastewater

The only increase in water use is associated with the use of Water Injection or Steam Injection and potentially with the use of flue gas treatment NOx controls, especially Selective Non-Catalytic Reduction

The amount of water used does often not exceed 50 percent of the total fuel input on a weight basis

WATER USE AND WASTEWATER


Hazardous waste

Catalysts used in the Selective Catalytic Reduction process can be hazardous

Examples are vanadia and titania catalysts

Many catalyst vendors recycle this material thus avoiding any disposal problem for the user

Some of the catalysts, especially those that use rare earth material such as zeolites, are not hazardous and their disposal does not present an adverse impact

HAZARDOUS WASTE


Burning hazardous waste

40 CFR 266.100, Subpart H allows for burning hazardous waste in industrial boilers

Prior to burning hazardous waste in a boiler, owner/operators must receive a permit

The destruction of hazardous waste in a boiler is considered treatment

A hazardous waste analysis must be performed prior to receiving a permit

BURNING HAZARDOUS WASTE


Burning hazardous waste1

General Requirements – Fugitive emissions.

Fugitive emissions must be controlled by:

(A) Keeping the combustion zone totally sealed against fugitive emissions; or

(B) Maintaining the combustion zone pressure lower than atmospheric pressure; or

(C) An alternate means of control demonstrated to provide fugitive emissions control equivalent to maintenance of combustion zone pressure lower than atmospheric pressure.

BURNING HAZARDOUS WASTE


Burning hazardous waste2

General Requirements – Automatic waste feed cutoff

A boiler must be operated with a functioning system that automatically cuts off the hazardous waste feed when operating conditions deviate

The permit limit for minimum combustion chamber temperature must be maintained while hazardous waste or hazardous waste residues remain in the combustion chamber

Exhaust gases must be ducted to the air pollution control system

Operating parameters for which permit limits are established must continue to be monitored

BURNING HAZARDOUS WASTE


Burning hazardous waste3

General Requirements – Changes

A boiler must cease burning hazardous waste when changes in combustion properties, or feed rates of the hazardous waste, other fuels, or industrial furnace feedstocks, or changes in the boiler or industrial furnace design or operating conditions deviate from the limits as specified in the permit.

BURNING HAZARDOUS WASTE


Asbestos

Asbestos was used in fire brick and gunnite used for internal insulation of boilers and other vessels

Asbestos is dangerous when it becomes “friable”

Asbestos materials are health hazards because:

Inhaled asbestos fibers can be trapped in the lungs

Inhaled asbestos fibers have been linked to cancerous cell growth in the lungs

If asbestos is in your older boiler, have workman alerted to its presence. Any friable asbestos should be removed by qualified workers.

ASBESTOS


Boiler safety precautions

Safety Precautions

An overheating boiler can quickly be identified by steam or a mixture of steam and water being discharged at the safety relief valve or from an open hot water faucet

If this condition is found at a faucet, close the faucet

Immediately shut down the water heater's source of heat

Allow the water heater to cool naturally without the addition of excess cold water

BOILER SAFETY PRECAUTIONS


Boiler safety precautions1

An overheating boiler may exhibit the following conditions:

1. A discharging safety relief valve.

2. Pressure and/or temperature readings above the maximum allowed for the boiler.

3. Low or no water in boilers equipped with water-level gage glasses.

4. Scorched or burning paint on the skin casing.

BOILER SAFETY PRECAUTIONS


Boiler safety precautions2

When a water heater or boiler is overheating, the only safe intervention is to remove the heat source by stopping the supply of fuel or air.

1. Do not try to relieve the pressure.

2. Do not add cool water into the vessel.

3. Do not try to cool the vessel with water.

Let the vessel cool down naturally. Get away from the vessel. Call a qualified repair company.

BOILER SAFETY PRECAUTIONS


Safety inspection items

1. Exterior shell and/or insulation - Look for indications of overheating

2. Leaks - Look for water on the floor or steam escaping

3. Flue gas leaks - Look for black dust (soot) around sheet-metal joints

4. Controls - Look for open panels, covers, and signs of rewiring on floor or bottom of panels

5. Electrical - Ensure that covers are installed on overlimit switches, temperature sensors, and controls

SAFETY INSPECTION ITEMS


Safety inspection items1

6. Safety valves - Ensure that a safety valve is installed with full-sized discharge piping properly supported and directed to a point of safe discharge

7. Fuel sources - Check for the ability to shut off the fuel source to the vessel

8. Gauges - Make sure temperature and pressure gauges are operational and are located for proper monitoring

9. Proper piping - Check for proper supports and allowance for expansion and contraction

10. Operating certificate - Observe certificate noting last date of inspection and expiration date when required

SAFETY INSPECTION ITEMS


Environmental inspection items

Post a copy of the air operating permit near the boiler

All boiler operators know how to operate the boiler within the permit limits

At the beginning of each shift, make sure the equipment is operating properly

Boiler operators should be familiar with the boiler’s operating and maintenance manual

Regular service should be performed on schedule and recorded

Operating records and inspection records should be reviewed regularly to ensure compliance

ENVIRONMENTAL INSPECTION ITEMS


Monitoring requirements

EPA’s Acid Rain Program has established special monitoring and reporting requirements for all units over 25 megawatts and new units under 25 megawatts that use fuel with a sulfur content greater than .05 percent by weight

The new units under 25 megawatts using clean fuels are required to certify their eligibility for an exemption every five years

All existing coal-fired units serving a generator greater than 25 megawatts and all new coal units must use CEM for SO2, NOx, flow, and opacity.

Units burning natural gas may determine SO2 mass emissions by three ways

MONITORING REQUIREMENTS


Monitoring requirements1

Units burning oil may monitor SO2 mass emissions by one of the following methods:

1. daily manual oil sampling and analysis plus oil flow meter (to continuously monitor oil usage)

2. sampling and analysis of diesel fuel oil as-delivered plus oil flow meter

3. automatic continuous oil sampling plus oil flow meter

4. SO2 and flow CEMs.

MONITORING REQUIREMENTS


Monitoring requirements2

Gas-fired and oil-fired base-loaded units must use NOx CEMs.

Gas-fired peaking units and oil-fired peaking units may either estimate NOx emissions by using site-specific emission correlations and periodic stack testing to verify continued representativeness of the correlations, or use NOx CEMS

All gas-fired units using natural gas for at least 90 percent of their annual heat input and units burning diesel fuel oil are exempt from opacity monitoring

For CO2 all units can use either (1) a mass balance estimation, or (2) CO2 CEMs, or (3) O2 CEMs in order to estimate CO2 emissions

MONITORING REQUIREMENTS


Monitoring requirements3

CEM systems include:

An SO2 pollutant concentration monitor

A NOx pollutant concentration monitor

A volumetric flow monitor

An opacity monitor

A diluent gas (O2 or CO2) monitor

A computer-based data acquisition and handling system (DAHS) for recording and performing calculations with the data

CEM systems must be in continuous operation and be able to sample, analyze, and record data at least every 15 minutes and reduce flow data to 1-hour averages.

MONITORING REQUIREMENTS


Recordkeeping

The CEM rule includes requirements for notification, recordkeeping, and reporting for the Acid Rain Program, such as:

Submission of monitoring plans

Written notifications of monitor certification tests

Report of certification test results in a "certification application“

Recording and maintaining of hourly emissions data, flow data, and other information

Quarterly reports of emissions, flow, unit operation, and monitoring performance data.

RECORDKEEPING


Recordkeeping1

The owner or operator also must report the data in a standard electronic format available through the Acid Rain Hotline

Unless otherwise specified by your regulators or permit conditions, it is recommended to keep these records for a minimum of 3 years unless the boiler destroys hazardous waste, then the records must be kept through closure of the boiler

RECORDKEEPING


Welcome

TIPS FOR USING CONTRACTORS

  • Remember, You Control Your Facility or Area!

  • Review Procedures With Them Before Starting the Job!

  • Ensure They Are Properly Trained!

  • Determine Their Environmental Compliance Record!

  • Determine Who Is in Charge of Their People!

  • Determine How They Will Affect Your Facility’s Environmental Compliance!


Welcome

ELEMENTS OF A SUCCESSFUL

INDUSTRIAL BOILER PROGRAM

  • DETAILED WRITTEN INDUSTRIAL BOILER INSPECTION GUIDELINES.

  • 2. DETAILED WRITTEN INDUSTRIAL BOILER BEST MANAGEMENT PRACTICES.

  • 3. EXTENSIVE EMPLOYEE TRAINING PROGRAMS

  • 4. PERIODIC REINFORCEMENT OF TRAINING

  • 5. SUFFICIENT DISCIPLINE REGARDING IMPLEMENTATION

  • 6. PERIODIC FOLLOW-UP


Welcome

THE IMPORTANCE OF A

CLEAN ENVIRONMENT

“I would ask all of us to remember that protecting our environment is about protecting where we live and how we live. Let us join together to protect our health, our economy, and our communities -- so all of us and our children and our grandchildren can enjoy a healthy and a prosperous life.”

Carol Browner Former EPA Administrator


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